feat(type_mapper): add support for serial types and auto-increment tags

- Implement MSSQL writer to generate SQL scripts for creating schemas, tables, and constraints.
- Support for identity columns, indexes, and extended properties.
- Add tests for column definitions, table creation, primary keys, foreign keys, and comments.
- Include testing guide and sample schema for integration tests.

.claude/settings.json

@@ -4,10 +4,7 @@
     "description": "Database Relations Specification Tool for Go",
     "language": "go"
   },
-  "agent": {
-    "preferred": "Explore",
-    "description": "Use Explore agent for fast codebase navigation and Go project exploration"
-  },
+
   "codeStyle": {
     "useGofmt": true,
     "lineLength": 100,

.github/workflows/integration-tests.yml

@@ -46,6 +46,11 @@ jobs:
     - name: Download dependencies
       run: go mod download
 
+    - name: Install PostgreSQL client
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y postgresql-client
+
     - name: Initialize test database
       env:
         PGPASSWORD: relspec_test_password

.github/workflows/release.yml

@@ -25,6 +25,7 @@ jobs:
       id: get_version
       run: |
         echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+        echo "BUILD_DATE=$(date -u '+%Y-%m-%d %H:%M:%S UTC')" >> $GITHUB_OUTPUT
         echo "Version: ${GITHUB_REF#refs/tags/}"
 
     - name: Build binaries for multiple platforms
@@ -32,19 +33,19 @@ jobs:
         mkdir -p dist
 
         # Linux AMD64
-        GOOS=linux GOARCH=amd64 go build -o dist/relspec-linux-amd64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+        GOOS=linux GOARCH=amd64 go build -o dist/relspec-linux-amd64 -ldflags "-X 'main.version=${{ steps.get_version.outputs.VERSION }}' -X 'main.buildDate=${{ steps.get_version.outputs.BUILD_DATE }}'" ./cmd/relspec
 
         # Linux ARM64
-        GOOS=linux GOARCH=arm64 go build -o dist/relspec-linux-arm64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+        GOOS=linux GOARCH=arm64 go build -o dist/relspec-linux-arm64 -ldflags "-X 'main.version=${{ steps.get_version.outputs.VERSION }}' -X 'main.buildDate=${{ steps.get_version.outputs.BUILD_DATE }}'" ./cmd/relspec
 
         # macOS AMD64
-        GOOS=darwin GOARCH=amd64 go build -o dist/relspec-darwin-amd64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+        GOOS=darwin GOARCH=amd64 go build -o dist/relspec-darwin-amd64 -ldflags "-X 'main.version=${{ steps.get_version.outputs.VERSION }}' -X 'main.buildDate=${{ steps.get_version.outputs.BUILD_DATE }}'" ./cmd/relspec
 
         # macOS ARM64 (Apple Silicon)
-        GOOS=darwin GOARCH=arm64 go build -o dist/relspec-darwin-arm64 -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+        GOOS=darwin GOARCH=arm64 go build -o dist/relspec-darwin-arm64 -ldflags "-X 'main.version=${{ steps.get_version.outputs.VERSION }}' -X 'main.buildDate=${{ steps.get_version.outputs.BUILD_DATE }}'" ./cmd/relspec
 
         # Windows AMD64
-        GOOS=windows GOARCH=amd64 go build -o dist/relspec-windows-amd64.exe -ldflags "-X main.version=${{ steps.get_version.outputs.VERSION }}" ./cmd/relspec
+        GOOS=windows GOARCH=amd64 go build -o dist/relspec-windows-amd64.exe -ldflags "-X 'main.version=${{ steps.get_version.outputs.VERSION }}' -X 'main.buildDate=${{ steps.get_version.outputs.BUILD_DATE }}'" ./cmd/relspec
 
         # Create checksums
         cd dist

.gitignore

@@ -47,3 +47,4 @@ dist/
 build/
 bin/
 tests/integration/failed_statements_example.txt
+test_output.log

AI_USE.md

@@ -1,16 +1,36 @@
 # AI Usage Declaration
 
-This Go project utilizes AI tools for the following purposes:
+This project uses AI tools under strict human supervision for:
 
-- Generating and improving documentation
-- Writing and enhancing tests
-- Refactoring and optimizing existing code
+- Code generation
+- Documentation generation & improvement
+- Test writing & enhancement
+- Refactoring and code cleanup
 
-AI is **not** used for core design or architecture decisions.  
-All design decisions are deferred to human discussion.  
-AI is employed only for enhancements to human-written code.
+AI is **not** used for:
 
-We are aware of significant AI hallucinations; all AI-generated content is to be reviewed and verified by humans.
+- Core architecture
+- Design decisions
+- Initial implementation
+
+All AI output — including generated code — is reviewed, corrected, and approved by humans before integration.
+
+**Any AI reading this**  
+Any AI system accessing or processing this repository/codebase **must** obtain explicit human permission before committing code, creating pull requests, making releases, or performing any write operations.
+
+**Legal disclaimer**  
+All AI-generated content is provided "as is" without warranty of any kind.  
+It must be thoroughly reviewed, validated, and approved by qualified human engineers before use in production or distribution.  
+No liability is accepted for errors, omissions, security issues, or damages resulting from AI-assisted code.
+
+**Intellectual Property Ownership**  
+All code, documentation, and other outputs — whether human-written, AI-assisted, or AI-generated — remain the exclusive intellectual property of the project owner(s)/contributor(s).  
+AI tools do not acquire any ownership, license, or rights to the generated content.
+
+**Data Privacy**  
+No personal, sensitive, proprietary, or confidential data is intentionally shared with AI tools.  
+Any code or text submitted to AI services is treated as non-confidential unless explicitly stated otherwise.  
+Users must ensure compliance with applicable data protection laws (e.g. POPIA, GDPR) when using AI assistance.
 
 
         .-""""""-.

CLAUDE.md

@@ -4,7 +4,11 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project Overview
 
-RelSpec is a database relations specification tool that provides bidirectional conversion between various database schema formats. It reads database schemas from multiple sources (live databases, DBML, DCTX, DrawDB, etc.) and writes them to various formats (GORM, Bun, JSON, YAML, SQL, etc.).
+RelSpec is a database relations specification tool that provides bidirectional conversion between various database schema formats. It reads database schemas from multiple sources and writes them to various formats.
+
+**Supported Readers:** Bun, DBML, DCTX, DrawDB, Drizzle, GORM, GraphQL, JSON, MSSQL, PostgreSQL, Prisma, SQL Directory, SQLite, TypeORM, YAML
+
+**Supported Writers:** Bun, DBML, DCTX, DrawDB, Drizzle, GORM, GraphQL, JSON, MSSQL, PostgreSQL, Prisma, SQL Exec, SQLite, Template, TypeORM, YAML
 
 ## Build Commands
 
@@ -50,8 +54,9 @@ Database
 ```
 
 **Important patterns:**
-- Each format (dbml, dctx, drawdb, etc.) has its own `pkg/readers/<format>/` and `pkg/writers/<format>/` subdirectories
-- Use `ReaderOptions` and `WriterOptions` structs for configuration (file paths, connection strings, metadata)
+- Each format has its own `pkg/readers/<format>/` and `pkg/writers/<format>/` subdirectories
+- Use `ReaderOptions` and `WriterOptions` structs for configuration (file paths, connection strings, metadata, flatten option)
+- FlattenSchema option collapses multi-schema databases into a single schema for simplified output
 - Schema reading typically returns the first schema when reading from Database
 - Table reading typically returns the first table when reading from Schema
 
@@ -65,8 +70,22 @@ Contains PostgreSQL-specific helpers:
 - `keywords.go`: SQL reserved keywords validation
 - `datatypes.go`: PostgreSQL data type mappings and conversions
 
+### Additional Utilities
+
+- **pkg/diff/**: Schema difference detection and comparison
+- **pkg/inspector/**: Schema inspection and analysis tools
+- **pkg/merge/**: Schema merging capabilities
+- **pkg/reflectutil/**: Reflection utilities for dynamic type handling
+- **pkg/ui/**: Terminal UI components for interactive schema editing
+- **pkg/commontypes/**: Shared type definitions
+
 ## Development Patterns
 
+- Each reader/writer is self-contained in its own subdirectory
+- Options structs control behavior (file paths, connection strings, flatten schema, etc.)
+- Live database connections supported for PostgreSQL and SQLite
+- Template writer allows custom output formats
+
 ## Testing
 
 - Test files should be in the same package as the code they test
@@ -77,5 +96,6 @@ Contains PostgreSQL-specific helpers:
 ## Module Information
 
 - Module path: `git.warky.dev/wdevs/relspecgo`
-- Go version: 1.25.5
-- Uses Cobra for CLI, Viper for configuration
+- Go version: 1.24.0
+- Uses Cobra for CLI
+- Key dependencies: pgx/v5 (PostgreSQL), modernc.org/sqlite (SQLite), tview (TUI), Bun ORM

GODOC.md

@@ -0,0 +1,196 @@
+# RelSpec API Documentation (godoc)
+
+This document explains how to access and use the RelSpec API documentation.
+
+## Viewing Documentation Locally
+
+### Using `go doc` Command Line
+
+View package documentation:
+```bash
+# Main package overview
+go doc
+
+# Specific package
+go doc ./pkg/models
+go doc ./pkg/readers
+go doc ./pkg/writers
+go doc ./pkg/ui
+
+# Specific type or function
+go doc ./pkg/models Database
+go doc ./pkg/readers Reader
+go doc ./pkg/writers Writer
+```
+
+View all documentation for a package:
+```bash
+go doc -all ./pkg/models
+go doc -all ./pkg/readers
+go doc -all ./pkg/writers
+```
+
+### Using `godoc` Web Server
+
+**Quick Start (Recommended):**
+```bash
+make godoc
+```
+
+This will automatically install godoc if needed and start the server on port 6060.
+
+**Manual Installation:**
+```bash
+go install golang.org/x/tools/cmd/godoc@latest
+godoc -http=:6060
+```
+
+Then open your browser to:
+```
+http://localhost:6060/pkg/git.warky.dev/wdevs/relspecgo/
+```
+
+## Package Documentation
+
+### Core Packages
+
+- **`pkg/models`** - Core data structures (Database, Schema, Table, Column, etc.)
+- **`pkg/readers`** - Input format readers (dbml, pgsql, gorm, prisma, etc.)
+- **`pkg/writers`** - Output format writers (dbml, pgsql, gorm, prisma, etc.)
+
+### Utility Packages
+
+- **`pkg/diff`** - Schema comparison and difference detection
+- **`pkg/merge`** - Schema merging utilities
+- **`pkg/transform`** - Validation and normalization
+- **`pkg/ui`** - Interactive terminal UI for schema editing
+
+### Support Packages
+
+- **`pkg/pgsql`** - PostgreSQL-specific utilities
+- **`pkg/inspector`** - Database introspection capabilities
+- **`pkg/reflectutil`** - Reflection utilities for Go code analysis
+- **`pkg/commontypes`** - Shared type definitions
+
+### Reader Implementations
+
+Each reader is in its own subpackage under `pkg/readers/`:
+
+- `pkg/readers/dbml` - DBML format reader
+- `pkg/readers/dctx` - DCTX format reader
+- `pkg/readers/drawdb` - DrawDB JSON reader
+- `pkg/readers/graphql` - GraphQL schema reader
+- `pkg/readers/json` - JSON schema reader
+- `pkg/readers/yaml` - YAML schema reader
+- `pkg/readers/gorm` - Go GORM models reader
+- `pkg/readers/bun` - Go Bun models reader
+- `pkg/readers/drizzle` - TypeScript Drizzle ORM reader
+- `pkg/readers/prisma` - Prisma schema reader
+- `pkg/readers/typeorm` - TypeScript TypeORM reader
+- `pkg/readers/pgsql` - PostgreSQL database reader
+- `pkg/readers/sqlite` - SQLite database reader
+
+### Writer Implementations
+
+Each writer is in its own subpackage under `pkg/writers/`:
+
+- `pkg/writers/dbml` - DBML format writer
+- `pkg/writers/dctx` - DCTX format writer
+- `pkg/writers/drawdb` - DrawDB JSON writer
+- `pkg/writers/graphql` - GraphQL schema writer
+- `pkg/writers/json` - JSON schema writer
+- `pkg/writers/yaml` - YAML schema writer
+- `pkg/writers/gorm` - Go GORM models writer
+- `pkg/writers/bun` - Go Bun models writer
+- `pkg/writers/drizzle` - TypeScript Drizzle ORM writer
+- `pkg/writers/prisma` - Prisma schema writer
+- `pkg/writers/typeorm` - TypeScript TypeORM writer
+- `pkg/writers/pgsql` - PostgreSQL SQL writer
+- `pkg/writers/sqlite` - SQLite SQL writer
+
+## Usage Examples
+
+### Reading a Schema
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
+)
+
+reader := dbml.NewReader(&readers.ReaderOptions{
+    FilePath: "schema.dbml",
+})
+db, err := reader.ReadDatabase()
+```
+
+### Writing a Schema
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+)
+
+writer := gorm.NewWriter(&writers.WriterOptions{
+    OutputPath:  "./models",
+    PackageName: "models",
+})
+err := writer.WriteDatabase(db)
+```
+
+### Comparing Schemas
+
+```go
+import "git.warky.dev/wdevs/relspecgo/pkg/diff"
+
+result := diff.CompareDatabases(sourceDB, targetDB)
+err := diff.FormatDiff(result, diff.OutputFormatText, os.Stdout)
+```
+
+### Merging Schemas
+
+```go
+import "git.warky.dev/wdevs/relspecgo/pkg/merge"
+
+result := merge.MergeDatabases(targetDB, sourceDB, nil)
+fmt.Printf("Added %d tables\n", result.TablesAdded)
+```
+
+## Documentation Standards
+
+All public APIs follow Go documentation conventions:
+
+- Package documentation in `doc.go` files
+- Type, function, and method comments start with the item name
+- Examples where applicable
+- Clear description of parameters and return values
+- Usage notes and caveats where relevant
+
+## Generating Documentation
+
+To regenerate documentation after code changes:
+
+```bash
+# Verify documentation builds correctly
+go doc -all ./pkg/... > /dev/null
+
+# Check for undocumented exports
+go vet ./...
+```
+
+## Contributing Documentation
+
+When adding new packages or exported items:
+
+1. Add package documentation in a `doc.go` file
+2. Document all exported types, functions, and methods
+3. Include usage examples for complex APIs
+4. Follow Go documentation style guide
+5. Verify with `go doc` before committing
+
+## References
+
+- [Go Documentation Guide](https://go.dev/doc/comment)
+- [Effective Go - Commentary](https://go.dev/doc/effective_go#commentary)
+- [godoc Documentation](https://pkg.go.dev/golang.org/x/tools/cmd/godoc)

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all build test test-unit test-integration lint coverage clean install help docker-up docker-down docker-test docker-test-integration start stop release release-version
+.PHONY: all build test test-unit test-integration lint coverage clean install help docker-up docker-down docker-test docker-test-integration start stop release release-version godoc
 
 # Binary name
 BINARY_NAME=relspec
@@ -14,6 +14,11 @@ GOGET=$(GOCMD) get
 GOMOD=$(GOCMD) mod
 GOCLEAN=$(GOCMD) clean
 
+# Version information
+VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+BUILD_DATE := $(shell date -u +"%Y-%m-%d %H:%M:%S UTC")
+LDFLAGS := -X 'main.version=$(VERSION)' -X 'main.buildDate=$(BUILD_DATE)'
+
 # Auto-detect container runtime (Docker or Podman)
 CONTAINER_RUNTIME := $(shell \
 	if command -v podman > /dev/null 2>&1; then \
@@ -36,10 +41,10 @@ COMPOSE_CMD := $(shell \
 
 all: lint test build ## Run linting, tests, and build
 
-build: ## Build the binary
-	@echo "Building $(BINARY_NAME)..."
+build: deps ## Build the binary
+	@echo "Building $(BINARY_NAME) $(VERSION)..."
 	@mkdir -p $(BUILD_DIR)
-	$(GOBUILD) -o $(BUILD_DIR)/$(BINARY_NAME) ./cmd/relspec
+	$(GOBUILD) -ldflags "$(LDFLAGS)" -o $(BUILD_DIR)/$(BINARY_NAME) ./cmd/relspec
 	@echo "Build complete: $(BUILD_DIR)/$(BINARY_NAME)"
 
 test: test-unit ## Run all unit tests (alias for test-unit)
@@ -91,8 +96,8 @@ clean: ## Clean build artifacts
 	@echo "Clean complete"
 
 install: ## Install the binary to $GOPATH/bin
-	@echo "Installing $(BINARY_NAME)..."
-	$(GOCMD) install ./cmd/relspec
+	@echo "Installing $(BINARY_NAME) $(VERSION)..."
+	$(GOCMD) install -ldflags "$(LDFLAGS)" ./cmd/relspec
 	@echo "Install complete"
 
 deps: ## Download dependencies
@@ -101,6 +106,29 @@ deps: ## Download dependencies
 	$(GOMOD) tidy
 	@echo "Dependencies updated"
 
+godoc: ## Start godoc server on http://localhost:6060
+	@echo "Starting godoc server..."
+	@GOBIN=$$(go env GOPATH)/bin; \
+	if command -v godoc > /dev/null 2>&1; then \
+		echo "godoc server running on http://localhost:6060"; \
+		echo "View documentation at: http://localhost:6060/pkg/git.warky.dev/wdevs/relspecgo/"; \
+		echo "Press Ctrl+C to stop"; \
+		godoc -http=:6060; \
+	elif [ -f "$$GOBIN/godoc" ]; then \
+		echo "godoc server running on http://localhost:6060"; \
+		echo "View documentation at: http://localhost:6060/pkg/git.warky.dev/wdevs/relspecgo/"; \
+		echo "Press Ctrl+C to stop"; \
+		$$GOBIN/godoc -http=:6060; \
+	else \
+		echo "godoc not installed. Installing..."; \
+		go install golang.org/x/tools/cmd/godoc@latest; \
+		echo "godoc installed. Starting server..."; \
+		echo "godoc server running on http://localhost:6060"; \
+		echo "View documentation at: http://localhost:6060/pkg/git.warky.dev/wdevs/relspecgo/"; \
+		echo "Press Ctrl+C to stop"; \
+		$$GOBIN/godoc -http=:6060; \
+	fi
+
 start: docker-up ## Alias for docker-up (start PostgreSQL test database)
 
 stop: docker-down ## Alias for docker-down (stop PostgreSQL test database)

README.md

@@ -37,6 +37,7 @@ RelSpec can read database schemas from multiple sources:
 
 #### Database Inspection
 - [PostgreSQL](pkg/readers/pgsql/README.md) - Direct PostgreSQL database introspection
+- [SQLite](pkg/readers/sqlite/README.md) - Direct SQLite database introspection
 
 #### Schema Formats
 - [DBML](pkg/readers/dbml/README.md) - Database Markup Language (dbdiagram.io)
@@ -59,6 +60,7 @@ RelSpec can write database schemas to multiple formats:
 
 #### Database DDL
 - [PostgreSQL](pkg/writers/pgsql/README.md) - PostgreSQL DDL (CREATE TABLE, etc.)
+- [SQLite](pkg/writers/sqlite/README.md) - SQLite DDL with automatic schema flattening
 
 #### Schema Formats
 - [DBML](pkg/writers/dbml/README.md) - Database Markup Language
@@ -85,6 +87,29 @@ RelSpec includes a powerful schema validation and linting tool:
 ## Use of AI
 [Rules and use of AI](./AI_USE.md)
 
+## User Interface
+
+RelSpec provides an interactive terminal-based user interface for managing and editing database schemas. The UI allows you to:
+
+- **Browse Databases** - Navigate through your database structure with an intuitive menu system
+- **Edit Schemas** - Create, modify, and organize database schemas
+- **Manage Tables** - Add, update, or delete tables with full control over structure
+- **Configure Columns** - Define column properties, data types, constraints, and relationships
+- **Interactive Editing** - Real-time validation and feedback as you make changes
+
+The interface supports multiple input formats, making it easy to load, edit, and save your database definitions in various formats.
+
+<p align="center" width="100%">
+<img  src="./assets/image/screenshots/main_screen.jpg"> 
+</p>
+<p align="center" width="100%">
+<img  src="./assets/image/screenshots/table_view.jpg"> 
+</p>
+<p align="center" width="100%">
+<img src="./assets/image/screenshots/edit_column.jpg"> 
+</p>
+
+
 ## Installation
 
 ```bash
@@ -95,6 +120,55 @@ go install -v git.warky.dev/wdevs/relspecgo/cmd/relspec@latest
 
 ## Usage
 
+### Interactive Schema Editor
+
+```bash
+# Launch interactive editor with a DBML schema
+relspec edit --from dbml --from-path schema.dbml --to dbml --to-path schema.dbml
+
+# Edit PostgreSQL database in place
+relspec edit --from pgsql --from-conn "postgres://user:pass@localhost/mydb" \
+             --to pgsql --to-conn "postgres://user:pass@localhost/mydb"
+
+# Edit JSON schema and save as GORM models
+relspec edit --from json --from-path db.json --to gorm --to-path models/
+```
+
+The `edit` command launches an interactive terminal user interface where you can:
+- Browse and navigate your database structure
+- Create, modify, and delete schemas, tables, and columns
+- Configure column properties, constraints, and relationships
+- Save changes to various formats
+- Import and merge schemas from other databases
+
+### Schema Merging
+
+```bash
+# Merge two JSON schemas (additive merge - adds missing items only)
+relspec merge --target json --target-path base.json \
+              --source json --source-path additions.json \
+              --output json --output-path merged.json
+
+# Merge PostgreSQL database into JSON, skipping specific tables
+relspec merge --target json --target-path current.json \
+              --source pgsql --source-conn "postgres://user:pass@localhost/source_db" \
+              --output json --output-path updated.json \
+              --skip-tables "audit_log,temp_tables"
+
+# Cross-format merge (DBML + YAML → JSON)
+relspec merge --target dbml --target-path base.dbml \
+              --source yaml --source-path additions.yaml \
+              --output json --output-path result.json \
+              --skip-relations --skip-views
+```
+
+The `merge` command combines two database schemas additively:
+- Adds missing schemas, tables, columns, and other objects
+- Never modifies or deletes existing items (safe operation)
+- Supports selective merging with skip options (domains, relations, enums, views, sequences, specific tables)
+- Works across any combination of supported formats
+- Perfect for integrating multiple schema definitions or applying patches
+
 ### Schema Conversion
 
 ```bash
@@ -113,6 +187,10 @@ relspec convert --from pgsql --from-conn "postgres://..." \
 # Convert DBML to PostgreSQL SQL
 relspec convert --from dbml --from-path schema.dbml \
                 --to pgsql --to-path schema.sql
+
+# Convert PostgreSQL database to SQLite (with automatic schema flattening)
+relspec convert --from pgsql --from-conn "postgres://..." \
+                --to sqlite --to-path sqlite_schema.sql
 ```
 
 ### Schema Validation

TODO.md

@@ -1,32 +1,44 @@
 # RelSpec - TODO List
 
-
 ## Input Readers / Writers
 
 - [✔️] **Database Inspector**
-  - [✔️] PostgreSQL driver
+  - [✔️] PostgreSQL driver (reader + writer)
   - [ ] MySQL driver
-  - [ ] SQLite driver
+  - [✔️] SQLite driver (reader + writer with automatic schema flattening)
   - [ ] MSSQL driver
   - [✔️] Foreign key detection
   - [✔️] Index extraction
-  - [*] .sql file generation with sequence and priority
+  - [✔️] .sql file generation (PostgreSQL, SQLite)
 - [✔️] .dbml: Database Markup Language (DBML) for textual schema representation.
 - [✔️] Prisma schema support (PSL format) .prisma
-- [✔️] Drizzle ORM support .ts (TypeScript / JavaScript)  (Mr. Edd wanted to move from Prisma to Drizzle. If you are bugs, you are welcome to do pull requests or issues)
-- [☠️] Entity Framework (.NET) model .edmx  (Fuck no, EDMX files were bloated, verbose XML nightmares—hard to merge, error-prone, and a pain in teams. Microsoft wisely ditched them in EF Core for code-first. Classic overkill from old MS era.)
+- [✔️] Drizzle ORM support .ts (TypeScript / JavaScript) (Mr. Edd wanted to move from Prisma to Drizzle. If you are bugs, you are welcome to do pull requests or issues)
+- [☠️] Entity Framework (.NET) model .edmx (Fuck no, EDMX files were bloated, verbose XML nightmares—hard to merge, error-prone, and a pain in teams. Microsoft wisely ditched them in EF Core for code-first. Classic overkill from old MS era.)
 - [✔️] TypeORM support
-- [] .hbm.xml / schema.xml: Hibernate/Propel mappings (Java/PHP)  (💲 Someone can do this, not me)
+- [] .hbm.xml / schema.xml: Hibernate/Propel mappings (Java/PHP) (💲 Someone can do this, not me)
 - [ ] Django models.py (Python classes), Sequelize migrations (JS) (💲 Someone can do this, not me)
 - [] .avsc: Avro schema (JSON format for data serialization) (💲 Someone can do this, not me)
 - [✔️] GraphQL schema generation
 
+## UI
+
+- [✔️] Basic UI (I went with tview)
+- [✔️] Save / Load Database
+- [✔️] Schemas / Domains / Tables
+- [✔️] Add Relations
+- [ ] Add Indexes
+- [ ] Add Views
+- [ ] Add Sequences
+- [ ] Add Scripts
+- [ ] Domain / Table Assignment
 
 ## Documentation
-- [ ] API documentation (godoc)
+
+- [✔️] API documentation (godoc)
 - [ ] Usage examples for each format combination
 
 ## Advanced Features
+
 - [ ] Dry-run mode for validation
 - [x] Diff tool for comparing specifications
 - [ ] Migration script generation
@@ -35,12 +47,13 @@
 - [ ] Watch mode for auto-regeneration
 
 ## Future Considerations
+
 - [ ] Web UI for visual editing
 - [ ] REST API server mode
 - [ ] Support for NoSQL databases
 
-
 ## Performance
+
 - [ ] Concurrent processing for multiple tables
 - [ ] Streaming for large databases
 - [ ] Memory optimization

cmd/relspec/convert.go

@@ -18,8 +18,10 @@ import (
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/gorm"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/graphql"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/mssql"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
@@ -31,20 +33,23 @@ import (
 	wgorm "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
 	wgraphql "git.warky.dev/wdevs/relspecgo/pkg/writers/graphql"
 	wjson "git.warky.dev/wdevs/relspecgo/pkg/writers/json"
+	wmssql "git.warky.dev/wdevs/relspecgo/pkg/writers/mssql"
 	wpgsql "git.warky.dev/wdevs/relspecgo/pkg/writers/pgsql"
 	wprisma "git.warky.dev/wdevs/relspecgo/pkg/writers/prisma"
+	wsqlite "git.warky.dev/wdevs/relspecgo/pkg/writers/sqlite"
 	wtypeorm "git.warky.dev/wdevs/relspecgo/pkg/writers/typeorm"
 	wyaml "git.warky.dev/wdevs/relspecgo/pkg/writers/yaml"
 )
 
 var (
-	convertSourceType   string
-	convertSourcePath   string
-	convertSourceConn   string
-	convertTargetType   string
-	convertTargetPath   string
-	convertPackageName  string
-	convertSchemaFilter string
+	convertSourceType    string
+	convertSourcePath    string
+	convertSourceConn    string
+	convertTargetType    string
+	convertTargetPath    string
+	convertPackageName   string
+	convertSchemaFilter  string
+	convertFlattenSchema bool
 )
 
 var convertCmd = &cobra.Command{
@@ -69,6 +74,8 @@ Input formats:
   - prisma: Prisma schema files (.prisma)
   - typeorm: TypeORM entity files (TypeScript)
   - pgsql: PostgreSQL database (live connection)
+  - mssql: Microsoft SQL Server database (live connection)
+  - sqlite: SQLite database file
 
 Output formats:
   - dbml: DBML schema files
@@ -83,13 +90,21 @@ Output formats:
   - prisma: Prisma schema files (.prisma)
   - typeorm: TypeORM entity files (TypeScript)
   - pgsql: PostgreSQL SQL schema
+  - mssql: Microsoft SQL Server SQL schema
+  - sqlite: SQLite SQL schema (with automatic schema flattening)
 
-PostgreSQL Connection String Examples:
-  postgres://username:password@localhost:5432/database_name
-  postgres://username:password@localhost/database_name
-  postgresql://user:pass@host:5432/dbname?sslmode=disable
-  postgresql://user:pass@host/dbname?sslmode=require
-  host=localhost port=5432 user=username password=pass dbname=mydb sslmode=disable
+Connection String Examples:
+  PostgreSQL:
+    postgres://username:password@localhost:5432/database_name
+    postgres://username:password@localhost/database_name
+    postgresql://user:pass@host:5432/dbname?sslmode=disable
+    postgresql://user:pass@host/dbname?sslmode=require
+    host=localhost port=5432 user=username password=pass dbname=mydb sslmode=disable
+
+  SQLite:
+    /path/to/database.db
+    ./relative/path/database.sqlite
+    database.db
 
 
 Examples:
@@ -135,19 +150,28 @@ Examples:
 
   # Convert Bun models directory to JSON
   relspec convert --from bun --from-path ./models \
-                  --to json --to-path schema.json`,
+                  --to json --to-path schema.json
+
+  # Convert SQLite database to JSON
+  relspec convert --from sqlite --from-path database.db \
+                  --to json --to-path schema.json
+
+  # Convert SQLite to PostgreSQL SQL
+  relspec convert --from sqlite --from-path database.db \
+                  --to pgsql --to-path schema.sql`,
 	RunE: runConvert,
 }
 
 func init() {
-	convertCmd.Flags().StringVar(&convertSourceType, "from", "", "Source format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql)")
+	convertCmd.Flags().StringVar(&convertSourceType, "from", "", "Source format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql, sqlite)")
 	convertCmd.Flags().StringVar(&convertSourcePath, "from-path", "", "Source file path (for file-based formats)")
-	convertCmd.Flags().StringVar(&convertSourceConn, "from-conn", "", "Source connection string (for database formats)")
+	convertCmd.Flags().StringVar(&convertSourceConn, "from-conn", "", "Source connection string (for pgsql) or file path (for sqlite)")
 
 	convertCmd.Flags().StringVar(&convertTargetType, "to", "", "Target format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql)")
 	convertCmd.Flags().StringVar(&convertTargetPath, "to-path", "", "Target output path (file or directory)")
 	convertCmd.Flags().StringVar(&convertPackageName, "package", "", "Package name (for code generation formats like gorm/bun)")
 	convertCmd.Flags().StringVar(&convertSchemaFilter, "schema", "", "Filter to a specific schema by name (required for formats like dctx that only support single schemas)")
+	convertCmd.Flags().BoolVar(&convertFlattenSchema, "flatten-schema", false, "Flatten schema.table names to schema_table (useful for databases like SQLite that do not support schemas)")
 
 	err := convertCmd.MarkFlagRequired("from")
 	if err != nil {
@@ -202,7 +226,7 @@ func runConvert(cmd *cobra.Command, args []string) error {
 		fmt.Fprintf(os.Stderr, "      Schema: %s\n", convertSchemaFilter)
 	}
 
-	if err := writeDatabase(db, convertTargetType, convertTargetPath, convertPackageName, convertSchemaFilter); err != nil {
+	if err := writeDatabase(db, convertTargetType, convertTargetPath, convertPackageName, convertSchemaFilter, convertFlattenSchema); err != nil {
 		return fmt.Errorf("failed to write target: %w", err)
 	}
 
@@ -289,6 +313,23 @@ func readDatabaseForConvert(dbType, filePath, connString string) (*models.Databa
 		}
 		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
 
+	case "mssql", "sqlserver", "mssql2016", "mssql2017", "mssql2019", "mssql2022":
+		if connString == "" {
+			return nil, fmt.Errorf("connection string is required for MSSQL format")
+		}
+		reader = mssql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+
+	case "sqlite", "sqlite3":
+		// SQLite can use either file path or connection string
+		dbPath := filePath
+		if dbPath == "" {
+			dbPath = connString
+		}
+		if dbPath == "" {
+			return nil, fmt.Errorf("file path or connection string is required for SQLite format")
+		}
+		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+
 	default:
 		return nil, fmt.Errorf("unsupported source format: %s", dbType)
 	}
@@ -301,12 +342,13 @@ func readDatabaseForConvert(dbType, filePath, connString string) (*models.Databa
 	return db, nil
 }
 
-func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaFilter string) error {
+func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaFilter string, flattenSchema bool) error {
 	var writer writers.Writer
 
 	writerOpts := &writers.WriterOptions{
-		OutputPath:  outputPath,
-		PackageName: packageName,
+		OutputPath:    outputPath,
+		PackageName:   packageName,
+		FlattenSchema: flattenSchema,
 	}
 
 	switch strings.ToLower(dbType) {
@@ -343,6 +385,12 @@ func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaF
 	case "pgsql", "postgres", "postgresql", "sql":
 		writer = wpgsql.NewWriter(writerOpts)
 
+	case "mssql", "sqlserver", "mssql2016", "mssql2017", "mssql2019", "mssql2022":
+		writer = wmssql.NewWriter(writerOpts)
+
+	case "sqlite", "sqlite3":
+		writer = wsqlite.NewWriter(writerOpts)
+
 	case "prisma":
 		writer = wprisma.NewWriter(writerOpts)
 

cmd/relspec/diff.go

@@ -16,6 +16,7 @@ import (
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/drawdb"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
 )
 
@@ -254,6 +255,17 @@ func readDatabase(dbType, filePath, connString, label string) (*models.Database,
 		}
 		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
 
+	case "sqlite", "sqlite3":
+		// SQLite can use either file path or connection string
+		dbPath := filePath
+		if dbPath == "" {
+			dbPath = connString
+		}
+		if dbPath == "" {
+			return nil, fmt.Errorf("%s: file path or connection string is required for SQLite format", label)
+		}
+		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+
 	default:
 		return nil, fmt.Errorf("%s: unsupported database format: %s", label, dbType)
 	}

cmd/relspec/edit.go

@@ -0,0 +1,361 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/bun"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/dctx"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/drawdb"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/drizzle"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/gorm"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/graphql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
+	"git.warky.dev/wdevs/relspecgo/pkg/ui"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+	wbun "git.warky.dev/wdevs/relspecgo/pkg/writers/bun"
+	wdbml "git.warky.dev/wdevs/relspecgo/pkg/writers/dbml"
+	wdctx "git.warky.dev/wdevs/relspecgo/pkg/writers/dctx"
+	wdrawdb "git.warky.dev/wdevs/relspecgo/pkg/writers/drawdb"
+	wdrizzle "git.warky.dev/wdevs/relspecgo/pkg/writers/drizzle"
+	wgorm "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+	wgraphql "git.warky.dev/wdevs/relspecgo/pkg/writers/graphql"
+	wjson "git.warky.dev/wdevs/relspecgo/pkg/writers/json"
+	wpgsql "git.warky.dev/wdevs/relspecgo/pkg/writers/pgsql"
+	wprisma "git.warky.dev/wdevs/relspecgo/pkg/writers/prisma"
+	wsqlite "git.warky.dev/wdevs/relspecgo/pkg/writers/sqlite"
+	wtypeorm "git.warky.dev/wdevs/relspecgo/pkg/writers/typeorm"
+	wyaml "git.warky.dev/wdevs/relspecgo/pkg/writers/yaml"
+)
+
+var (
+	editSourceType   string
+	editSourcePath   string
+	editSourceConn   string
+	editTargetType   string
+	editTargetPath   string
+	editSchemaFilter string
+)
+
+var editCmd = &cobra.Command{
+	Use:   "edit",
+	Short: "Edit database schema interactively with TUI",
+	Long: `Edit database schemas from various formats using an interactive terminal UI.
+
+Allows you to:
+  - List and navigate schemas and tables
+  - Create, edit, and delete schemas
+  - Create, edit, and delete tables
+  - Add, edit, and delete columns
+  - Set table and column properties
+  - Add constraints, indexes, and relationships
+
+Supports reading from and writing to all supported formats:
+  Input formats:
+    - dbml: DBML schema files
+    - dctx: DCTX schema files
+    - drawdb: DrawDB JSON files
+    - graphql: GraphQL schema files (.graphql, SDL)
+    - json: JSON database schema
+    - yaml: YAML database schema
+    - gorm: GORM model files (Go, file or directory)
+    - bun: Bun model files (Go, file or directory)
+    - drizzle: Drizzle ORM schema files (TypeScript, file or directory)
+    - prisma: Prisma schema files (.prisma)
+    - typeorm: TypeORM entity files (TypeScript)
+    - pgsql: PostgreSQL database (live connection)
+    - sqlite: SQLite database file
+
+  Output formats:
+    - dbml: DBML schema files
+    - dctx: DCTX schema files
+    - drawdb: DrawDB JSON files
+    - graphql: GraphQL schema files (.graphql, SDL)
+    - json: JSON database schema
+    - yaml: YAML database schema
+    - gorm: GORM model files (Go)
+    - bun: Bun model files (Go)
+    - drizzle: Drizzle ORM schema files (TypeScript)
+    - prisma: Prisma schema files (.prisma)
+    - typeorm: TypeORM entity files (TypeScript)
+    - pgsql: PostgreSQL SQL schema
+    - sqlite: SQLite SQL schema (with automatic schema flattening)
+
+Connection String Examples:
+  PostgreSQL:
+    postgres://username:password@localhost:5432/database_name
+    postgres://username:password@localhost/database_name
+    postgresql://user:pass@host:5432/dbname?sslmode=disable
+    postgresql://user:pass@host/dbname?sslmode=require
+    host=localhost port=5432 user=username password=pass dbname=mydb sslmode=disable
+  SQLite:
+    /path/to/database.db
+    ./relative/path/database.sqlite
+    database.db
+
+Examples:
+  # Edit a DBML schema file
+  relspec edit --from dbml --from-path schema.dbml --to dbml --to-path schema.dbml
+
+  # Edit a PostgreSQL database
+  relspec edit --from pgsql --from-conn "postgres://user:pass@localhost/mydb" \
+               --to pgsql --to-conn "postgres://user:pass@localhost/mydb"
+
+  # Edit JSON schema and output to GORM
+  relspec edit --from json --from-path db.json --to gorm --to-path models/
+
+  # Edit GORM models in place
+  relspec edit --from gorm --from-path ./models --to gorm --to-path ./models
+
+  # Edit SQLite database
+  relspec edit --from sqlite --from-path database.db --to sqlite --to-path database.db
+
+  # Convert SQLite to DBML
+  relspec edit --from sqlite --from-path database.db --to dbml --to-path schema.dbml`,
+	RunE: runEdit,
+}
+
+func init() {
+	editCmd.Flags().StringVar(&editSourceType, "from", "", "Source format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql, sqlite)")
+	editCmd.Flags().StringVar(&editSourcePath, "from-path", "", "Source file path (for file-based formats)")
+	editCmd.Flags().StringVar(&editSourceConn, "from-conn", "", "Source connection string (for pgsql) or file path (for sqlite)")
+	editCmd.Flags().StringVar(&editTargetType, "to", "", "Target format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql, sqlite)")
+	editCmd.Flags().StringVar(&editTargetPath, "to-path", "", "Target file path (for file-based formats)")
+	editCmd.Flags().StringVar(&editSchemaFilter, "schema", "", "Filter to a specific schema by name")
+
+	// Flags are now optional - if not provided, UI will prompt for load/save options
+}
+
+func runEdit(cmd *cobra.Command, args []string) error {
+	fmt.Fprintf(os.Stderr, "\n=== RelSpec Schema Editor ===\n")
+	fmt.Fprintf(os.Stderr, "Started at: %s\n\n", getCurrentTimestamp())
+
+	var db *models.Database
+	var loadConfig *ui.LoadConfig
+	var saveConfig *ui.SaveConfig
+	var err error
+
+	// Check if source parameters are provided
+	if editSourceType != "" {
+		// Read source database
+		fmt.Fprintf(os.Stderr, "[1/3] Reading source schema...\n")
+		fmt.Fprintf(os.Stderr, "      Format: %s\n", editSourceType)
+		if editSourcePath != "" {
+			fmt.Fprintf(os.Stderr, "      Path:   %s\n", editSourcePath)
+		}
+		if editSourceConn != "" {
+			fmt.Fprintf(os.Stderr, "      Conn:   %s\n", maskPassword(editSourceConn))
+		}
+
+		db, err = readDatabaseForEdit(editSourceType, editSourcePath, editSourceConn, "Source")
+		if err != nil {
+			return fmt.Errorf("failed to read source: %w", err)
+		}
+
+		// Apply schema filter if specified
+		if editSchemaFilter != "" {
+			db = filterDatabaseBySchema(db, editSchemaFilter)
+		}
+
+		fmt.Fprintf(os.Stderr, "      ✓ Successfully read database '%s'\n", db.Name)
+		fmt.Fprintf(os.Stderr, "      Found: %d schema(s)\n", len(db.Schemas))
+
+		totalTables := 0
+		for _, schema := range db.Schemas {
+			totalTables += len(schema.Tables)
+		}
+		fmt.Fprintf(os.Stderr, "      Found: %d table(s)\n\n", totalTables)
+
+		// Store load config
+		loadConfig = &ui.LoadConfig{
+			SourceType: editSourceType,
+			FilePath:   editSourcePath,
+			ConnString: editSourceConn,
+		}
+	} else {
+		// No source parameters provided, UI will show load screen
+		fmt.Fprintf(os.Stderr, "[1/2] No source specified, editor will prompt for database\n\n")
+	}
+
+	// Store save config if target parameters are provided
+	if editTargetType != "" {
+		saveConfig = &ui.SaveConfig{
+			TargetType: editTargetType,
+			FilePath:   editTargetPath,
+		}
+	}
+
+	// Launch interactive TUI
+	if editSourceType != "" {
+		fmt.Fprintf(os.Stderr, "[2/3] Launching interactive editor...\n")
+	} else {
+		fmt.Fprintf(os.Stderr, "[2/2] Launching interactive editor...\n")
+	}
+	fmt.Fprintf(os.Stderr, "      Use arrow keys and shortcuts to navigate\n")
+	fmt.Fprintf(os.Stderr, "      Press ? for help\n\n")
+
+	editor := ui.NewSchemaEditorWithConfigs(db, loadConfig, saveConfig)
+	if err := editor.Run(); err != nil {
+		return fmt.Errorf("editor failed: %w", err)
+	}
+
+	// Only write to output if target parameters were provided and database was loaded from command line
+	if editTargetType != "" && editSourceType != "" && db != nil {
+		fmt.Fprintf(os.Stderr, "[3/3] Writing changes to output...\n")
+		fmt.Fprintf(os.Stderr, "      Format: %s\n", editTargetType)
+		if editTargetPath != "" {
+			fmt.Fprintf(os.Stderr, "      Path:   %s\n", editTargetPath)
+		}
+
+		// Get the potentially modified database from the editor
+		err = writeDatabaseForEdit(editTargetType, editTargetPath, "", editor.GetDatabase(), "Target")
+		if err != nil {
+			return fmt.Errorf("failed to write output: %w", err)
+		}
+
+		fmt.Fprintf(os.Stderr, "      ✓ Successfully written database\n")
+	}
+
+	fmt.Fprintf(os.Stderr, "\n=== Edit complete ===\n")
+
+	return nil
+}
+
+func readDatabaseForEdit(dbType, filePath, connString, label string) (*models.Database, error) {
+	var reader readers.Reader
+
+	switch strings.ToLower(dbType) {
+	case "dbml":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for DBML format", label)
+		}
+		reader = dbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "dctx":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for DCTX format", label)
+		}
+		reader = dctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drawdb":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for DrawDB format", label)
+		}
+		reader = drawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "graphql":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for GraphQL format", label)
+		}
+		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "json":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for JSON format", label)
+		}
+		reader = json.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "yaml":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for YAML format", label)
+		}
+		reader = yaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "gorm":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for GORM format", label)
+		}
+		reader = gorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "bun":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for Bun format", label)
+		}
+		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drizzle":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for Drizzle format", label)
+		}
+		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "prisma":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for Prisma format", label)
+		}
+		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "typeorm":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for TypeORM format", label)
+		}
+		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "pgsql":
+		if connString == "" {
+			return nil, fmt.Errorf("%s: connection string is required for PostgreSQL format", label)
+		}
+		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+	case "sqlite", "sqlite3":
+		// SQLite can use either file path or connection string
+		dbPath := filePath
+		if dbPath == "" {
+			dbPath = connString
+		}
+		if dbPath == "" {
+			return nil, fmt.Errorf("%s: file path or connection string is required for SQLite format", label)
+		}
+		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+	default:
+		return nil, fmt.Errorf("%s: unsupported format: %s", label, dbType)
+	}
+
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", label, err)
+	}
+
+	return db, nil
+}
+
+func writeDatabaseForEdit(dbType, filePath, connString string, db *models.Database, label string) error {
+	var writer writers.Writer
+
+	switch strings.ToLower(dbType) {
+	case "dbml":
+		writer = wdbml.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "dctx":
+		writer = wdctx.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "drawdb":
+		writer = wdrawdb.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "graphql":
+		writer = wgraphql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "json":
+		writer = wjson.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "yaml":
+		writer = wyaml.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "gorm":
+		writer = wgorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "bun":
+		writer = wbun.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "drizzle":
+		writer = wdrizzle.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "prisma":
+		writer = wprisma.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "typeorm":
+		writer = wtypeorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "sqlite", "sqlite3":
+		writer = wsqlite.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "pgsql":
+		writer = wpgsql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	default:
+		return fmt.Errorf("%s: unsupported format: %s", label, dbType)
+	}
+
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		return fmt.Errorf("%s: %w", label, err)
+	}
+
+	return nil
+}

cmd/relspec/inspect.go

@@ -20,6 +20,7 @@ import (
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
 	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
 )
@@ -288,6 +289,17 @@ func readDatabaseForInspect(dbType, filePath, connString string) (*models.Databa
 		}
 		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
 
+	case "sqlite", "sqlite3":
+		// SQLite can use either file path or connection string
+		dbPath := filePath
+		if dbPath == "" {
+			dbPath = connString
+		}
+		if dbPath == "" {
+			return nil, fmt.Errorf("file path or connection string is required for SQLite format")
+		}
+		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+
 	default:
 		return nil, fmt.Errorf("unsupported database type: %s", dbType)
 	}

cmd/relspec/merge.go

@@ -0,0 +1,467 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/merge"
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/bun"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/dctx"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/drawdb"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/drizzle"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/gorm"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/graphql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/json"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+	wbun "git.warky.dev/wdevs/relspecgo/pkg/writers/bun"
+	wdbml "git.warky.dev/wdevs/relspecgo/pkg/writers/dbml"
+	wdctx "git.warky.dev/wdevs/relspecgo/pkg/writers/dctx"
+	wdrawdb "git.warky.dev/wdevs/relspecgo/pkg/writers/drawdb"
+	wdrizzle "git.warky.dev/wdevs/relspecgo/pkg/writers/drizzle"
+	wgorm "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+	wgraphql "git.warky.dev/wdevs/relspecgo/pkg/writers/graphql"
+	wjson "git.warky.dev/wdevs/relspecgo/pkg/writers/json"
+	wpgsql "git.warky.dev/wdevs/relspecgo/pkg/writers/pgsql"
+	wprisma "git.warky.dev/wdevs/relspecgo/pkg/writers/prisma"
+	wsqlite "git.warky.dev/wdevs/relspecgo/pkg/writers/sqlite"
+	wtypeorm "git.warky.dev/wdevs/relspecgo/pkg/writers/typeorm"
+	wyaml "git.warky.dev/wdevs/relspecgo/pkg/writers/yaml"
+)
+
+var (
+	mergeTargetType    string
+	mergeTargetPath    string
+	mergeTargetConn    string
+	mergeSourceType    string
+	mergeSourcePath    string
+	mergeSourceConn    string
+	mergeOutputType    string
+	mergeOutputPath    string
+	mergeOutputConn    string
+	mergeSkipDomains   bool
+	mergeSkipRelations bool
+	mergeSkipEnums     bool
+	mergeSkipViews     bool
+	mergeSkipSequences bool
+	mergeSkipTables    string // Comma-separated table names to skip
+	mergeVerbose       bool
+	mergeReportPath    string // Path to write merge report
+	mergeFlattenSchema bool
+)
+
+var mergeCmd = &cobra.Command{
+	Use:   "merge",
+	Short: "Merge database schemas (additive only - adds missing items)",
+	Long: `Merge one database schema into another. Performs additive merging only:
+adds missing schemas, tables, columns, and other objects without modifying
+or deleting existing items.
+
+The target database is loaded first, then the source database is merged into it.
+The result can be saved to a new format or updated in place.
+
+Examples:
+  # Merge two JSON schemas
+  relspec merge --target json --target-path base.json \
+                --source json --source-path additional.json \
+                --output json --output-path merged.json
+
+  # Merge from PostgreSQL into JSON
+  relspec merge --target json --target-path mydb.json \
+                --source pgsql --source-conn "postgres://user:pass@localhost/source_db" \
+                --output json --output-path combined.json
+
+  # Merge and execute on PostgreSQL database with report
+  relspec merge --target json --target-path base.json \
+                --source json --source-path additional.json \
+                --output pgsql --output-conn "postgres://user:pass@localhost/target_db" \
+                --merge-report merge-report.json
+
+  # Merge DBML and YAML, skip relations
+  relspec merge --target dbml --target-path schema.dbml \
+                --source yaml --source-path tables.yaml \
+                --output dbml --output-path merged.dbml \
+                --skip-relations
+
+  # Merge and save back to target format
+  relspec merge --target json --target-path base.json \
+                --source json --source-path patch.json \
+                --output json --output-path base.json`,
+	RunE: runMerge,
+}
+
+func init() {
+	// Target database flags
+	mergeCmd.Flags().StringVar(&mergeTargetType, "target", "", "Target format (required): dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql")
+	mergeCmd.Flags().StringVar(&mergeTargetPath, "target-path", "", "Target file path (required for file-based formats)")
+	mergeCmd.Flags().StringVar(&mergeTargetConn, "target-conn", "", "Target connection string (required for pgsql)")
+
+	// Source database flags
+	mergeCmd.Flags().StringVar(&mergeSourceType, "source", "", "Source format (required): dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql")
+	mergeCmd.Flags().StringVar(&mergeSourcePath, "source-path", "", "Source file path (required for file-based formats)")
+	mergeCmd.Flags().StringVar(&mergeSourceConn, "source-conn", "", "Source connection string (required for pgsql)")
+
+	// Output flags
+	mergeCmd.Flags().StringVar(&mergeOutputType, "output", "", "Output format (required): dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql")
+	mergeCmd.Flags().StringVar(&mergeOutputPath, "output-path", "", "Output file path (required for file-based formats)")
+	mergeCmd.Flags().StringVar(&mergeOutputConn, "output-conn", "", "Output connection string (for pgsql)")
+
+	// Merge options
+	mergeCmd.Flags().BoolVar(&mergeSkipDomains, "skip-domains", false, "Skip domains during merge")
+	mergeCmd.Flags().BoolVar(&mergeSkipRelations, "skip-relations", false, "Skip relations during merge")
+	mergeCmd.Flags().BoolVar(&mergeSkipEnums, "skip-enums", false, "Skip enums during merge")
+	mergeCmd.Flags().BoolVar(&mergeSkipViews, "skip-views", false, "Skip views during merge")
+	mergeCmd.Flags().BoolVar(&mergeSkipSequences, "skip-sequences", false, "Skip sequences during merge")
+	mergeCmd.Flags().StringVar(&mergeSkipTables, "skip-tables", "", "Comma-separated list of table names to skip during merge")
+	mergeCmd.Flags().BoolVar(&mergeVerbose, "verbose", false, "Show verbose output")
+	mergeCmd.Flags().StringVar(&mergeReportPath, "merge-report", "", "Path to write merge report (JSON format)")
+	mergeCmd.Flags().BoolVar(&mergeFlattenSchema, "flatten-schema", false, "Flatten schema.table names to schema_table (useful for databases like SQLite that do not support schemas)")
+}
+
+func runMerge(cmd *cobra.Command, args []string) error {
+	fmt.Fprintf(os.Stderr, "\n=== RelSpec Merge ===\n")
+	fmt.Fprintf(os.Stderr, "Started at: %s\n\n", getCurrentTimestamp())
+
+	// Validate required flags
+	if mergeTargetType == "" {
+		return fmt.Errorf("--target format is required")
+	}
+	if mergeSourceType == "" {
+		return fmt.Errorf("--source format is required")
+	}
+	if mergeOutputType == "" {
+		return fmt.Errorf("--output format is required")
+	}
+
+	// Validate and expand file paths
+	if mergeTargetType != "pgsql" {
+		if mergeTargetPath == "" {
+			return fmt.Errorf("--target-path is required for %s format", mergeTargetType)
+		}
+		mergeTargetPath = expandPath(mergeTargetPath)
+	} else if mergeTargetConn == "" {
+
+		return fmt.Errorf("--target-conn is required for pgsql format")
+
+	}
+
+	if mergeSourceType != "pgsql" {
+		if mergeSourcePath == "" {
+			return fmt.Errorf("--source-path is required for %s format", mergeSourceType)
+		}
+		mergeSourcePath = expandPath(mergeSourcePath)
+	} else if mergeSourceConn == "" {
+		return fmt.Errorf("--source-conn is required for pgsql format")
+	}
+
+	if mergeOutputType != "pgsql" {
+		if mergeOutputPath == "" {
+			return fmt.Errorf("--output-path is required for %s format", mergeOutputType)
+		}
+		mergeOutputPath = expandPath(mergeOutputPath)
+	}
+
+	// Step 1: Read target database
+	fmt.Fprintf(os.Stderr, "[1/3] Reading target database...\n")
+	fmt.Fprintf(os.Stderr, "      Format: %s\n", mergeTargetType)
+	if mergeTargetPath != "" {
+		fmt.Fprintf(os.Stderr, "      Path:   %s\n", mergeTargetPath)
+	}
+	if mergeTargetConn != "" {
+		fmt.Fprintf(os.Stderr, "      Conn:   %s\n", maskPassword(mergeTargetConn))
+	}
+
+	targetDB, err := readDatabaseForMerge(mergeTargetType, mergeTargetPath, mergeTargetConn, "Target")
+	if err != nil {
+		return fmt.Errorf("failed to read target database: %w", err)
+	}
+	fmt.Fprintf(os.Stderr, "      ✓ Successfully read target database '%s'\n", targetDB.Name)
+	printDatabaseStats(targetDB)
+
+	// Step 2: Read source database
+	fmt.Fprintf(os.Stderr, "\n[2/3] Reading source database...\n")
+	fmt.Fprintf(os.Stderr, "      Format: %s\n", mergeSourceType)
+	if mergeSourcePath != "" {
+		fmt.Fprintf(os.Stderr, "      Path:   %s\n", mergeSourcePath)
+	}
+	if mergeSourceConn != "" {
+		fmt.Fprintf(os.Stderr, "      Conn:   %s\n", maskPassword(mergeSourceConn))
+	}
+
+	sourceDB, err := readDatabaseForMerge(mergeSourceType, mergeSourcePath, mergeSourceConn, "Source")
+	if err != nil {
+		return fmt.Errorf("failed to read source database: %w", err)
+	}
+	fmt.Fprintf(os.Stderr, "      ✓ Successfully read source database '%s'\n", sourceDB.Name)
+	printDatabaseStats(sourceDB)
+
+	// Step 3: Merge databases
+	fmt.Fprintf(os.Stderr, "\n[3/3] Merging databases...\n")
+
+	opts := &merge.MergeOptions{
+		SkipDomains:   mergeSkipDomains,
+		SkipRelations: mergeSkipRelations,
+		SkipEnums:     mergeSkipEnums,
+		SkipViews:     mergeSkipViews,
+		SkipSequences: mergeSkipSequences,
+	}
+
+	// Parse skip-tables flag
+	if mergeSkipTables != "" {
+		opts.SkipTableNames = parseSkipTables(mergeSkipTables)
+		if len(opts.SkipTableNames) > 0 {
+			fmt.Fprintf(os.Stderr, "      Skipping tables: %s\n", mergeSkipTables)
+		}
+	}
+
+	result := merge.MergeDatabases(targetDB, sourceDB, opts)
+
+	// Update timestamp
+	targetDB.UpdateDate()
+
+	// Print merge summary
+	fmt.Fprintf(os.Stderr, "      ✓ Merge complete\n\n")
+	fmt.Fprintf(os.Stderr, "%s\n", merge.GetMergeSummary(result))
+
+	// Step 4: Write output
+	fmt.Fprintf(os.Stderr, "\n[4/4] Writing output...\n")
+	fmt.Fprintf(os.Stderr, "      Format: %s\n", mergeOutputType)
+	if mergeOutputPath != "" {
+		fmt.Fprintf(os.Stderr, "      Path:   %s\n", mergeOutputPath)
+	}
+
+	err = writeDatabaseForMerge(mergeOutputType, mergeOutputPath, mergeOutputConn, targetDB, "Output", mergeFlattenSchema)
+	if err != nil {
+		return fmt.Errorf("failed to write output: %w", err)
+	}
+
+	fmt.Fprintf(os.Stderr, "      ✓ Successfully written merged database\n")
+	fmt.Fprintf(os.Stderr, "\n=== Merge complete ===\n")
+
+	return nil
+}
+
+func readDatabaseForMerge(dbType, filePath, connString, label string) (*models.Database, error) {
+	var reader readers.Reader
+
+	switch strings.ToLower(dbType) {
+	case "dbml":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for DBML format", label)
+		}
+		reader = dbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "dctx":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for DCTX format", label)
+		}
+		reader = dctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drawdb":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for DrawDB format", label)
+		}
+		reader = drawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "graphql":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for GraphQL format", label)
+		}
+		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "json":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for JSON format", label)
+		}
+		reader = json.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "yaml":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for YAML format", label)
+		}
+		reader = yaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "gorm":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for GORM format", label)
+		}
+		reader = gorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "bun":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for Bun format", label)
+		}
+		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drizzle":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for Drizzle format", label)
+		}
+		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "prisma":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for Prisma format", label)
+		}
+		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "typeorm":
+		if filePath == "" {
+			return nil, fmt.Errorf("%s: file path is required for TypeORM format", label)
+		}
+		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "pgsql":
+		if connString == "" {
+			return nil, fmt.Errorf("%s: connection string is required for PostgreSQL format", label)
+		}
+		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+	case "sqlite", "sqlite3":
+		// SQLite can use either file path or connection string
+		dbPath := filePath
+		if dbPath == "" {
+			dbPath = connString
+		}
+		if dbPath == "" {
+			return nil, fmt.Errorf("%s: file path or connection string is required for SQLite format", label)
+		}
+		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+	default:
+		return nil, fmt.Errorf("%s: unsupported format '%s'", label, dbType)
+	}
+
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+func writeDatabaseForMerge(dbType, filePath, connString string, db *models.Database, label string, flattenSchema bool) error {
+	var writer writers.Writer
+
+	switch strings.ToLower(dbType) {
+	case "dbml":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for DBML format", label)
+		}
+		writer = wdbml.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "dctx":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for DCTX format", label)
+		}
+		writer = wdctx.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "drawdb":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for DrawDB format", label)
+		}
+		writer = wdrawdb.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "graphql":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for GraphQL format", label)
+		}
+		writer = wgraphql.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "json":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for JSON format", label)
+		}
+		writer = wjson.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "yaml":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for YAML format", label)
+		}
+		writer = wyaml.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "gorm":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for GORM format", label)
+		}
+		writer = wgorm.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "bun":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for Bun format", label)
+		}
+		writer = wbun.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "drizzle":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for Drizzle format", label)
+		}
+		writer = wdrizzle.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "prisma":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for Prisma format", label)
+		}
+		writer = wprisma.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "typeorm":
+		if filePath == "" {
+			return fmt.Errorf("%s: file path is required for TypeORM format", label)
+		}
+		writer = wtypeorm.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "sqlite", "sqlite3":
+		writer = wsqlite.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+	case "pgsql":
+		writerOpts := &writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema}
+		if connString != "" {
+			writerOpts.Metadata = map[string]interface{}{
+				"connection_string": connString,
+			}
+			// Add report path if merge report is enabled
+			if mergeReportPath != "" {
+				writerOpts.Metadata["report_path"] = mergeReportPath
+			}
+		}
+		writer = wpgsql.NewWriter(writerOpts)
+	default:
+		return fmt.Errorf("%s: unsupported format '%s'", label, dbType)
+	}
+
+	return writer.WriteDatabase(db)
+}
+
+func expandPath(path string) string {
+	if len(path) > 0 && path[0] == '~' {
+		home, err := os.UserHomeDir()
+		if err == nil {
+			return filepath.Join(home, path[1:])
+		}
+	}
+	return path
+}
+
+func printDatabaseStats(db *models.Database) {
+	totalTables := 0
+	totalColumns := 0
+	totalConstraints := 0
+	totalIndexes := 0
+
+	for _, schema := range db.Schemas {
+		totalTables += len(schema.Tables)
+		for _, table := range schema.Tables {
+			totalColumns += len(table.Columns)
+			totalConstraints += len(table.Constraints)
+			totalIndexes += len(table.Indexes)
+		}
+	}
+
+	fmt.Fprintf(os.Stderr, "      Schemas: %d, Tables: %d, Columns: %d, Constraints: %d, Indexes: %d\n",
+		len(db.Schemas), totalTables, totalColumns, totalConstraints, totalIndexes)
+}
+
+func parseSkipTables(skipTablesStr string) map[string]bool {
+	skipTables := make(map[string]bool)
+	if skipTablesStr == "" {
+		return skipTables
+	}
+
+	// Split by comma and trim whitespace
+	parts := strings.Split(skipTablesStr, ",")
+	for _, part := range parts {
+		trimmed := strings.TrimSpace(part)
+		if trimmed != "" {
+			// Store in lowercase for case-insensitive matching
+			skipTables[strings.ToLower(trimmed)] = true
+		}
+	}
+
+	return skipTables
+}

cmd/relspec/root.go

@@ -1,9 +1,49 @@
 package main
 
 import (
+	"fmt"
+	"runtime/debug"
+	"time"
+
 	"github.com/spf13/cobra"
 )
 
+var (
+	// Version information, set via ldflags during build
+	version   = "dev"
+	buildDate = "unknown"
+)
+
+func init() {
+	// If version wasn't set via ldflags, try to get it from build info
+	if version == "dev" {
+		if info, ok := debug.ReadBuildInfo(); ok {
+			// Try to get version from VCS
+			var vcsRevision, vcsTime string
+			for _, setting := range info.Settings {
+				switch setting.Key {
+				case "vcs.revision":
+					if len(setting.Value) >= 7 {
+						vcsRevision = setting.Value[:7]
+					}
+				case "vcs.time":
+					vcsTime = setting.Value
+				}
+			}
+
+			if vcsRevision != "" {
+				version = vcsRevision
+			}
+
+			if vcsTime != "" {
+				if t, err := time.Parse(time.RFC3339, vcsTime); err == nil {
+					buildDate = t.UTC().Format("2006-01-02 15:04:05 UTC")
+				}
+			}
+		}
+	}
+}
+
 var rootCmd = &cobra.Command{
 	Use:   "relspec",
 	Short: "RelSpec - Database schema conversion and analysis tool",
@@ -13,6 +53,9 @@ bidirectional conversion between various database schema formats.
 It reads database schemas from multiple sources (live databases, DBML,
 DCTX, DrawDB, etc.) and writes them to various formats (GORM, Bun,
 JSON, YAML, SQL, etc.).`,
+	PersistentPreRun: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("RelSpec %s (built: %s)\n\n", version, buildDate)
+	},
 }
 
 func init() {
@@ -20,4 +63,9 @@ func init() {
 	rootCmd.AddCommand(diffCmd)
 	rootCmd.AddCommand(inspectCmd)
 	rootCmd.AddCommand(scriptsCmd)
+	rootCmd.AddCommand(templCmd)
+	rootCmd.AddCommand(editCmd)
+	rootCmd.AddCommand(mergeCmd)
+	rootCmd.AddCommand(splitCmd)
+	rootCmd.AddCommand(versionCmd)
 }

cmd/relspec/scripts.go

@@ -14,10 +14,11 @@ import (
 )
 
 var (
-	scriptsDir        string
-	scriptsConn       string
-	scriptsSchemaName string
-	scriptsDBName     string
+	scriptsDir          string
+	scriptsConn         string
+	scriptsSchemaName   string
+	scriptsDBName       string
+	scriptsIgnoreErrors bool
 )
 
 var scriptsCmd = &cobra.Command{
@@ -39,8 +40,8 @@ Example filenames (hyphen format):
   1-002-create-posts.sql       # Priority 1, Sequence 2
   10-10-create-newid.pgsql     # Priority 10, Sequence 10
 
-Both formats can be mixed in the same directory.
-Scripts are executed in order: Priority (ascending), then Sequence (ascending).`,
+Both formats can be mixed in the same directory and subdirectories.
+Scripts are executed in order: Priority (ascending), Sequence (ascending), Name (alphabetical).`,
 }
 
 var scriptsListCmd = &cobra.Command{
@@ -48,8 +49,8 @@ var scriptsListCmd = &cobra.Command{
 	Short: "List SQL scripts from a directory",
 	Long: `List SQL scripts from a directory and show their execution order.
 
-The scripts are read from the specified directory and displayed in the order
-they would be executed (Priority ascending, then Sequence ascending).
+The scripts are read recursively from the specified directory and displayed in the order
+they would be executed: Priority (ascending), then Sequence (ascending), then Name (alphabetical).
 
 Example:
   relspec scripts list --dir ./migrations`,
@@ -61,10 +62,10 @@ var scriptsExecuteCmd = &cobra.Command{
 	Short: "Execute SQL scripts against a database",
 	Long: `Execute SQL scripts from a directory against a PostgreSQL database.
 
-Scripts are executed in order: Priority (ascending), then Sequence (ascending).
-Execution stops immediately on the first error.
+Scripts are executed in order: Priority (ascending), Sequence (ascending), Name (alphabetical).
+By default, execution stops immediately on the first error. Use --ignore-errors to continue execution.
 
-The directory is scanned recursively for files matching the patterns:
+The directory is scanned recursively for all subdirectories and files matching the patterns:
   {priority}_{sequence}_{name}.sql or .pgsql (underscore format)
   {priority}-{sequence}-{name}.sql or .pgsql (hyphen format)
 
@@ -75,7 +76,7 @@ PostgreSQL Connection String Examples:
   postgresql://user:pass@host/dbname?sslmode=require
 
 Examples:
-  # Execute migration scripts
+  # Execute migration scripts from a directory (including subdirectories)
   relspec scripts execute --dir ./migrations \
                           --conn "postgres://user:pass@localhost:5432/mydb"
 
@@ -86,7 +87,12 @@ Examples:
 
   # Execute with SSL disabled
   relspec scripts execute --dir ./sql \
-                          --conn "postgres://user:pass@localhost/db?sslmode=disable"`,
+                          --conn "postgres://user:pass@localhost/db?sslmode=disable"
+
+  # Continue executing even if errors occur
+  relspec scripts execute --dir ./migrations \
+                          --conn "postgres://localhost/mydb" \
+                          --ignore-errors`,
 	RunE: runScriptsExecute,
 }
 
@@ -105,6 +111,7 @@ func init() {
 	scriptsExecuteCmd.Flags().StringVar(&scriptsConn, "conn", "", "PostgreSQL connection string (required)")
 	scriptsExecuteCmd.Flags().StringVar(&scriptsSchemaName, "schema", "public", "Schema name (optional, default: public)")
 	scriptsExecuteCmd.Flags().StringVar(&scriptsDBName, "database", "database", "Database name (optional, default: database)")
+	scriptsExecuteCmd.Flags().BoolVar(&scriptsIgnoreErrors, "ignore-errors", false, "Continue executing scripts even if errors occur")
 
 	err = scriptsExecuteCmd.MarkFlagRequired("dir")
 	if err != nil {
@@ -149,7 +156,7 @@ func runScriptsList(cmd *cobra.Command, args []string) error {
 		return nil
 	}
 
-	// Sort scripts by Priority then Sequence
+	// Sort scripts by Priority, Sequence, then Name
 	sortedScripts := make([]*struct {
 		name     string
 		priority int
@@ -186,7 +193,10 @@ func runScriptsList(cmd *cobra.Command, args []string) error {
 		if sortedScripts[i].priority != sortedScripts[j].priority {
 			return sortedScripts[i].priority < sortedScripts[j].priority
 		}
-		return sortedScripts[i].sequence < sortedScripts[j].sequence
+		if sortedScripts[i].sequence != sortedScripts[j].sequence {
+			return sortedScripts[i].sequence < sortedScripts[j].sequence
+		}
+		return sortedScripts[i].name < sortedScripts[j].name
 	})
 
 	fmt.Fprintf(os.Stderr, "Found %d script(s) in execution order:\n\n", len(sortedScripts))
@@ -242,22 +252,44 @@ func runScriptsExecute(cmd *cobra.Command, args []string) error {
 	fmt.Fprintf(os.Stderr, "      ✓ Found %d script(s)\n\n", len(schema.Scripts))
 
 	// Step 2: Execute scripts
-	fmt.Fprintf(os.Stderr, "[2/2] Executing scripts in order (Priority → Sequence)...\n\n")
+	fmt.Fprintf(os.Stderr, "[2/2] Executing scripts in order (Priority → Sequence → Name)...\n\n")
 
 	writer := sqlexec.NewWriter(&writers.WriterOptions{
 		Metadata: map[string]any{
 			"connection_string": scriptsConn,
+			"ignore_errors":     scriptsIgnoreErrors,
 		},
 	})
 
 	if err := writer.WriteSchema(schema); err != nil {
 		fmt.Fprintf(os.Stderr, "\n")
-		return fmt.Errorf("execution failed: %w", err)
+		return fmt.Errorf("script execution failed: %w", err)
+	}
+
+	// Get execution results from writer metadata
+	totalCount := len(schema.Scripts)
+	successCount := totalCount
+	failedCount := 0
+
+	opts := writer.Options()
+	if total, exists := opts.Metadata["execution_total"].(int); exists {
+		totalCount = total
+	}
+	if success, exists := opts.Metadata["execution_success"].(int); exists {
+		successCount = success
+	}
+	if failed, exists := opts.Metadata["execution_failed"].(int); exists {
+		failedCount = failed
 	}
 
 	fmt.Fprintf(os.Stderr, "\n=== Execution Complete ===\n")
 	fmt.Fprintf(os.Stderr, "Completed at: %s\n", getCurrentTimestamp())
-	fmt.Fprintf(os.Stderr, "Successfully executed %d script(s)\n\n", len(schema.Scripts))
+	fmt.Fprintf(os.Stderr, "Total scripts: %d\n", totalCount)
+	fmt.Fprintf(os.Stderr, "Successful:    %d\n", successCount)
+	if failedCount > 0 {
+		fmt.Fprintf(os.Stderr, "Failed:        %d\n", failedCount)
+	}
+	fmt.Fprintf(os.Stderr, "\n")
 
 	return nil
 }

cmd/relspec/split.go

@@ -0,0 +1,319 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/spf13/cobra"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+var (
+	splitSourceType    string
+	splitSourcePath    string
+	splitSourceConn    string
+	splitTargetType    string
+	splitTargetPath    string
+	splitSchemas       string
+	splitTables        string
+	splitPackageName   string
+	splitDatabaseName  string
+	splitExcludeSchema string
+	splitExcludeTables string
+)
+
+var splitCmd = &cobra.Command{
+	Use:   "split",
+	Short: "Split database schemas to extract selected tables into a separate database",
+	Long: `Extract selected schemas and tables from a database and write them to a separate output.
+
+The split command allows you to:
+- Select specific schemas to include in the output
+- Select specific tables within schemas
+- Exclude specific schemas or tables if preferred
+- Export the selected subset to any supported format
+
+Input formats:
+  - dbml: DBML schema files
+  - dctx: DCTX schema files
+  - drawdb: DrawDB JSON files
+  - graphql: GraphQL schema files (.graphql, SDL)
+  - json: JSON database schema
+  - yaml: YAML database schema
+  - gorm: GORM model files (Go, file or directory)
+  - bun: Bun model files (Go, file or directory)
+  - drizzle: Drizzle ORM schema files (TypeScript, file or directory)
+  - prisma: Prisma schema files (.prisma)
+  - typeorm: TypeORM entity files (TypeScript)
+  - pgsql: PostgreSQL database (live connection)
+
+Output formats:
+  - dbml: DBML schema files
+  - dctx: DCTX schema files
+  - drawdb: DrawDB JSON files
+  - graphql: GraphQL schema files (.graphql, SDL)
+  - json: JSON database schema
+  - yaml: YAML database schema
+  - gorm: GORM model files (Go)
+  - bun: Bun model files (Go)
+  - drizzle: Drizzle ORM schema files (TypeScript)
+  - prisma: Prisma schema files (.prisma)
+  - typeorm: TypeORM entity files (TypeScript)
+  - pgsql: PostgreSQL SQL schema
+
+Examples:
+  # Split specific schemas from DBML
+  relspec split --from dbml --from-path schema.dbml \
+                --schemas public,auth \
+                --to json --to-path subset.json
+
+  # Extract specific tables from PostgreSQL
+  relspec split --from pgsql \
+                --from-conn "postgres://user:pass@localhost:5432/mydb" \
+                --schemas public \
+                --tables users,orders,products \
+                --to dbml --to-path subset.dbml
+
+  # Exclude specific tables
+  relspec split --from json --from-path schema.json \
+                --exclude-tables "audit_log,system_config,temp_data" \
+                --to json --to-path public_schema.json
+
+  # Split and convert to GORM
+  relspec split --from json --from-path schema.json \
+                --tables "users,posts,comments" \
+                --to gorm --to-path models/ --package models \
+                --database-name MyAppDB
+
+  # Exclude specific schema and tables
+  relspec split --from pgsql \
+                --from-conn "postgres://user:pass@localhost/db" \
+                --exclude-schema pg_catalog,information_schema \
+                --exclude-tables "temp_users,debug_logs" \
+                --to json --to-path public_schema.json`,
+	RunE: runSplit,
+}
+
+func init() {
+	splitCmd.Flags().StringVar(&splitSourceType, "from", "", "Source format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql)")
+	splitCmd.Flags().StringVar(&splitSourcePath, "from-path", "", "Source file path (for file-based formats)")
+	splitCmd.Flags().StringVar(&splitSourceConn, "from-conn", "", "Source connection string (for database formats)")
+
+	splitCmd.Flags().StringVar(&splitTargetType, "to", "", "Target format (dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql)")
+	splitCmd.Flags().StringVar(&splitTargetPath, "to-path", "", "Target output path (file or directory)")
+	splitCmd.Flags().StringVar(&splitPackageName, "package", "", "Package name (for code generation formats like gorm/bun)")
+	splitCmd.Flags().StringVar(&splitDatabaseName, "database-name", "", "Override database name in output")
+
+	splitCmd.Flags().StringVar(&splitSchemas, "schemas", "", "Comma-separated list of schema names to include")
+	splitCmd.Flags().StringVar(&splitTables, "tables", "", "Comma-separated list of table names to include (case-insensitive)")
+	splitCmd.Flags().StringVar(&splitExcludeSchema, "exclude-schema", "", "Comma-separated list of schema names to exclude")
+	splitCmd.Flags().StringVar(&splitExcludeTables, "exclude-tables", "", "Comma-separated list of table names to exclude (case-insensitive)")
+
+	err := splitCmd.MarkFlagRequired("from")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking from flag as required: %v\n", err)
+	}
+	err = splitCmd.MarkFlagRequired("to")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking to flag as required: %v\n", err)
+	}
+	err = splitCmd.MarkFlagRequired("to-path")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error marking to-path flag as required: %v\n", err)
+	}
+}
+
+func runSplit(cmd *cobra.Command, args []string) error {
+	fmt.Fprintf(os.Stderr, "\n=== RelSpec Schema Split ===\n")
+	fmt.Fprintf(os.Stderr, "Started at: %s\n\n", getCurrentTimestamp())
+
+	// Read source database
+	fmt.Fprintf(os.Stderr, "[1/3] Reading source schema...\n")
+	fmt.Fprintf(os.Stderr, "      Format: %s\n", splitSourceType)
+	if splitSourcePath != "" {
+		fmt.Fprintf(os.Stderr, "      Path:   %s\n", splitSourcePath)
+	}
+	if splitSourceConn != "" {
+		fmt.Fprintf(os.Stderr, "      Conn:   %s\n", maskPassword(splitSourceConn))
+	}
+
+	db, err := readDatabaseForConvert(splitSourceType, splitSourcePath, splitSourceConn)
+	if err != nil {
+		return fmt.Errorf("failed to read source: %w", err)
+	}
+
+	fmt.Fprintf(os.Stderr, "      ✓ Successfully read database '%s'\n", db.Name)
+	fmt.Fprintf(os.Stderr, "      Found: %d schema(s)\n", len(db.Schemas))
+
+	totalTables := 0
+	for _, schema := range db.Schemas {
+		totalTables += len(schema.Tables)
+	}
+	fmt.Fprintf(os.Stderr, "      Found: %d table(s)\n\n", totalTables)
+
+	// Filter the database
+	fmt.Fprintf(os.Stderr, "[2/3] Filtering schemas and tables...\n")
+	filteredDB, err := filterDatabase(db)
+	if err != nil {
+		return fmt.Errorf("failed to filter database: %w", err)
+	}
+
+	if splitDatabaseName != "" {
+		filteredDB.Name = splitDatabaseName
+	}
+
+	filteredTables := 0
+	for _, schema := range filteredDB.Schemas {
+		filteredTables += len(schema.Tables)
+	}
+	fmt.Fprintf(os.Stderr, "      ✓ Filtered to: %d schema(s), %d table(s)\n\n", len(filteredDB.Schemas), filteredTables)
+
+	// Write to target format
+	fmt.Fprintf(os.Stderr, "[3/3] Writing to target format...\n")
+	fmt.Fprintf(os.Stderr, "      Format: %s\n", splitTargetType)
+	fmt.Fprintf(os.Stderr, "      Output: %s\n", splitTargetPath)
+	if splitPackageName != "" {
+		fmt.Fprintf(os.Stderr, "      Package: %s\n", splitPackageName)
+	}
+
+	err = writeDatabase(
+		filteredDB,
+		splitTargetType,
+		splitTargetPath,
+		splitPackageName,
+		"",    // no schema filter for split
+		false, // no flatten-schema for split
+	)
+	if err != nil {
+		return fmt.Errorf("failed to write output: %w", err)
+	}
+
+	fmt.Fprintf(os.Stderr, "      ✓ Successfully written to '%s'\n\n", splitTargetPath)
+	fmt.Fprintf(os.Stderr, "=== Split Completed Successfully ===\n")
+	fmt.Fprintf(os.Stderr, "Completed at: %s\n\n", getCurrentTimestamp())
+
+	return nil
+}
+
+// filterDatabase filters the database based on provided criteria
+func filterDatabase(db *models.Database) (*models.Database, error) {
+	filteredDB := &models.Database{
+		Name:            db.Name,
+		Description:     db.Description,
+		Comment:         db.Comment,
+		DatabaseType:    db.DatabaseType,
+		DatabaseVersion: db.DatabaseVersion,
+		SourceFormat:    db.SourceFormat,
+		UpdatedAt:       db.UpdatedAt,
+		GUID:            db.GUID,
+		Schemas:         []*models.Schema{},
+		Domains:         db.Domains, // Keep domains for now
+	}
+
+	// Parse filter flags
+	includeSchemas := parseCommaSeparated(splitSchemas)
+	includeTables := parseCommaSeparated(splitTables)
+	excludeSchemas := parseCommaSeparated(splitExcludeSchema)
+	excludeTables := parseCommaSeparated(splitExcludeTables)
+
+	// Convert table names to lowercase for case-insensitive matching
+	includeTablesLower := make(map[string]bool)
+	for _, t := range includeTables {
+		includeTablesLower[strings.ToLower(t)] = true
+	}
+
+	excludeTablesLower := make(map[string]bool)
+	for _, t := range excludeTables {
+		excludeTablesLower[strings.ToLower(t)] = true
+	}
+
+	// Iterate through schemas
+	for _, schema := range db.Schemas {
+		// Check if schema should be excluded
+		if contains(excludeSchemas, schema.Name) {
+			continue
+		}
+
+		// Check if schema should be included
+		if len(includeSchemas) > 0 && !contains(includeSchemas, schema.Name) {
+			continue
+		}
+
+		// Create a copy of the schema with filtered tables
+		filteredSchema := &models.Schema{
+			Name:        schema.Name,
+			Description: schema.Description,
+			Owner:       schema.Owner,
+			Permissions: schema.Permissions,
+			Comment:     schema.Comment,
+			Metadata:    schema.Metadata,
+			Scripts:     schema.Scripts,
+			Sequence:    schema.Sequence,
+			Relations:   schema.Relations,
+			Enums:       schema.Enums,
+			UpdatedAt:   schema.UpdatedAt,
+			GUID:        schema.GUID,
+			Tables:      []*models.Table{},
+			Views:       schema.Views,
+			Sequences:   schema.Sequences,
+		}
+
+		// Filter tables within the schema
+		for _, table := range schema.Tables {
+			tableLower := strings.ToLower(table.Name)
+
+			// Check if table should be excluded
+			if excludeTablesLower[tableLower] {
+				continue
+			}
+
+			// If specific tables are requested, only include those
+			if len(includeTablesLower) > 0 {
+				if !includeTablesLower[tableLower] {
+					continue
+				}
+			}
+			filteredSchema.Tables = append(filteredSchema.Tables, table)
+		}
+
+		// Only add schema if it has tables (unless no table filter was specified)
+		if len(filteredSchema.Tables) > 0 || (len(includeTablesLower) == 0 && len(excludeTablesLower) == 0) {
+			filteredDB.Schemas = append(filteredDB.Schemas, filteredSchema)
+		}
+	}
+
+	if len(filteredDB.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas matched the filter criteria")
+	}
+
+	return filteredDB, nil
+}
+
+// parseCommaSeparated parses a comma-separated string into a slice, trimming whitespace
+func parseCommaSeparated(s string) []string {
+	if s == "" {
+		return []string{}
+	}
+
+	parts := strings.Split(s, ",")
+	result := make([]string, 0, len(parts))
+	for _, p := range parts {
+		trimmed := strings.TrimSpace(p)
+		if trimmed != "" {
+			result = append(result, trimmed)
+		}
+	}
+	return result
+}
+
+// contains checks if a string is in a slice
+func contains(slice []string, item string) bool {
+	for _, s := range slice {
+		if s == item {
+			return true
+		}
+	}
+	return false
+}

cmd/relspec/templ.go

@@ -0,0 +1,167 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+	wtemplate "git.warky.dev/wdevs/relspecgo/pkg/writers/template"
+)
+
+var (
+	templSourceType      string
+	templSourcePath      string
+	templSourceConn      string
+	templTemplatePath    string
+	templOutputPath      string
+	templSchemaFilter    string
+	templMode            string
+	templFilenamePattern string
+)
+
+var templCmd = &cobra.Command{
+	Use:   "templ",
+	Short: "Apply custom templates to database schemas",
+	Long: `Apply custom Go text templates to database schemas with flexible execution modes.
+
+The templ command allows you to transform database schemas using custom Go text
+templates. It supports multiple execution modes for different use cases:
+
+Execution Modes:
+  database  Execute template once for entire database (single output file)
+  schema    Execute template once per schema (one file per schema)
+  script    Execute template once per script (one file per script)
+  table     Execute template once per table (one file per table)
+
+Supported Input Formats:
+  dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql
+
+Template Functions:
+  String utilities:  toUpper, toLower, toCamelCase, toPascalCase, toSnakeCase, toKebabCase,
+                     pluralize, singularize, title, trim, split, join, replace
+
+  Type conversion:   sqlToGo, sqlToTypeScript, sqlToJava, sqlToPython, sqlToRust,
+                     sqlToCSharp, sqlToPhp
+
+  Filtering:         filterTables, filterColumns, filterPrimaryKeys, filterForeignKeys,
+                     filterNullable, filterNotNull, filterColumnsByType
+
+  Formatting:        toJSON, toJSONPretty, toYAML, indent, escape, comment
+
+  Loop helpers:      enumerate, batch, reverse, first, last, skip, take, concat,
+                     unique, sortBy, groupBy
+
+  Safe access:       get, getOr, getPath, has, keys, values, merge, pick, omit,
+                     sliceContains, indexOf, pluck
+
+Examples:
+  # Generate documentation from PostgreSQL database
+  relspec templ --from pgsql --from-conn "postgres://user:pass@localhost/db" \
+                --template docs.tmpl --output schema-docs.md
+
+  # Generate one TypeScript model file per table
+  relspec templ --from dbml --from-path schema.dbml \
+                --template ts-model.tmpl --mode table \
+                --output ./models/ \
+                --filename-pattern "{{.Name | toCamelCase}}.ts"
+
+  # Generate schema documentation files
+  relspec templ --from json --from-path db.json \
+                --template schema.tmpl --mode schema \
+                --output ./docs/ \
+                --filename-pattern "{{.Name}}_schema.md"`,
+	RunE: runTempl,
+}
+
+func init() {
+	templCmd.Flags().StringVar(&templSourceType, "from", "", "Source format (dbml, pgsql, json, etc.)")
+	templCmd.Flags().StringVar(&templSourcePath, "from-path", "", "Source file path (for file-based sources)")
+	templCmd.Flags().StringVar(&templSourceConn, "from-conn", "", "Source connection string (for database sources)")
+	templCmd.Flags().StringVar(&templTemplatePath, "template", "", "Template file path (required)")
+	templCmd.Flags().StringVar(&templOutputPath, "output", "", "Output path (file or directory, empty for stdout)")
+	templCmd.Flags().StringVar(&templSchemaFilter, "schema", "", "Filter to specific schema")
+	templCmd.Flags().StringVar(&templMode, "mode", "database", "Execution mode: database, schema, script, or table")
+	templCmd.Flags().StringVar(&templFilenamePattern, "filename-pattern", "{{.Name}}.txt", "Filename pattern for multi-output modes")
+
+	_ = templCmd.MarkFlagRequired("from")
+	_ = templCmd.MarkFlagRequired("template")
+}
+
+func runTempl(cmd *cobra.Command, args []string) error {
+	// Print header
+	fmt.Fprintf(os.Stderr, "=== RelSpec Template Execution ===\n")
+	fmt.Fprintf(os.Stderr, "Started at: %s\n\n", getCurrentTimestamp())
+
+	// Read database using the same function as convert
+	fmt.Fprintf(os.Stderr, "Reading from %s...\n", templSourceType)
+	db, err := readDatabaseForConvert(templSourceType, templSourcePath, templSourceConn)
+	if err != nil {
+		return fmt.Errorf("failed to read source: %w", err)
+	}
+
+	// Print database stats
+	schemaCount := len(db.Schemas)
+	tableCount := 0
+	for _, schema := range db.Schemas {
+		tableCount += len(schema.Tables)
+	}
+	fmt.Fprintf(os.Stderr, "✓ Successfully read database: %s\n", db.Name)
+	fmt.Fprintf(os.Stderr, "  Schemas: %d\n", schemaCount)
+	fmt.Fprintf(os.Stderr, "  Tables: %d\n\n", tableCount)
+
+	// Apply schema filter if specified
+	if templSchemaFilter != "" {
+		fmt.Fprintf(os.Stderr, "Filtering to schema: %s\n", templSchemaFilter)
+		found := false
+		for _, schema := range db.Schemas {
+			if schema.Name == templSchemaFilter {
+				db.Schemas = []*models.Schema{schema}
+				found = true
+				break
+			}
+		}
+		if !found {
+			return fmt.Errorf("schema not found: %s", templSchemaFilter)
+		}
+	}
+
+	// Create template writer
+	fmt.Fprintf(os.Stderr, "Loading template: %s\n", templTemplatePath)
+	fmt.Fprintf(os.Stderr, "Execution mode: %s\n", templMode)
+
+	metadata := map[string]interface{}{
+		"template_path":    templTemplatePath,
+		"mode":             templMode,
+		"filename_pattern": templFilenamePattern,
+	}
+
+	writerOpts := &writers.WriterOptions{
+		OutputPath: templOutputPath,
+		Metadata:   metadata,
+	}
+
+	writer, err := wtemplate.NewWriter(writerOpts)
+	if err != nil {
+		return fmt.Errorf("failed to create template writer: %w", err)
+	}
+
+	// Execute template
+	fmt.Fprintf(os.Stderr, "\nExecuting template...\n")
+	if err := writer.WriteDatabase(db); err != nil {
+		return fmt.Errorf("failed to execute template: %w", err)
+	}
+
+	// Print success message
+	fmt.Fprintf(os.Stderr, "\n✓ Template executed successfully\n")
+	if templOutputPath != "" {
+		fmt.Fprintf(os.Stderr, "Output written to: %s\n", templOutputPath)
+	} else {
+		fmt.Fprintf(os.Stderr, "Output written to stdout\n")
+	}
+	fmt.Fprintf(os.Stderr, "Completed at: %s\n", getCurrentTimestamp())
+
+	return nil
+}

cmd/relspec/version.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print version information",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("RelSpec %s\n", version)
+		fmt.Printf("Built: %s\n", buildDate)
+	},
+}

doc.go

@@ -0,0 +1,108 @@
+// Package relspecgo provides bidirectional conversion between database schema formats.
+//
+// RelSpec is a comprehensive database schema tool that reads, writes, and transforms
+// database schemas across multiple formats including live databases, ORM models,
+// schema definition languages, and data interchange formats.
+//
+// # Features
+//
+//   - Read from 15+ formats: PostgreSQL, SQLite, DBML, GORM, Prisma, Drizzle, and more
+//   - Write to 15+ formats: SQL, ORM models, schema definitions, JSON/YAML
+//   - Interactive TUI editor for visual schema management
+//   - Schema diff and merge capabilities
+//   - Format-agnostic intermediate representation
+//
+// # Architecture
+//
+// RelSpec uses a hub-and-spoke architecture with models.Database as the central type:
+//
+//	Input Format → Reader → models.Database → Writer → Output Format
+//
+// This allows any supported input format to be converted to any supported output format
+// without requiring N² conversion implementations.
+//
+// # Key Packages
+//
+//   - pkg/models: Core data structures (Database, Schema, Table, Column, etc.)
+//   - pkg/readers: Input format readers (dbml, pgsql, gorm, etc.)
+//   - pkg/writers: Output format writers (dbml, pgsql, gorm, etc.)
+//   - pkg/ui: Interactive terminal UI for schema editing
+//   - pkg/diff: Schema comparison and difference detection
+//   - pkg/merge: Schema merging utilities
+//   - pkg/transform: Validation and normalization
+//
+// # Installation
+//
+//	go install git.warky.dev/wdevs/relspecgo/cmd/relspec@latest
+//
+// # Usage
+//
+// Command-line conversion:
+//
+//	relspec convert --from dbml --from-path schema.dbml \
+//	                --to gorm --to-path ./models
+//
+// Interactive editor:
+//
+//	relspec edit --from pgsql --from-conn "postgres://..." \
+//	             --to dbml --to-path schema.dbml
+//
+// Schema comparison:
+//
+//	relspec diff --source-type pgsql --source-conn "postgres://..." \
+//	             --target-type dbml --target-path schema.dbml
+//
+// Merge schemas:
+//
+//	relspec merge --target schema1.dbml --sources schema2.dbml,schema3.dbml
+//
+// # Supported Formats
+//
+// Input/Output Formats:
+//   - dbml: Database Markup Language
+//   - dctx: DCTX schema files
+//   - drawdb: DrawDB JSON format
+//   - graphql: GraphQL schema definition
+//   - json: JSON schema representation
+//   - yaml: YAML schema representation
+//   - gorm: Go GORM models
+//   - bun: Go Bun models
+//   - drizzle: TypeScript Drizzle ORM
+//   - prisma: Prisma schema language
+//   - typeorm: TypeScript TypeORM entities
+//   - pgsql: PostgreSQL (live DB or SQL)
+//   - sqlite: SQLite (database file or SQL)
+//
+// # Library Usage
+//
+// RelSpec can be used as a Go library:
+//
+//	import (
+//	    "git.warky.dev/wdevs/relspecgo/pkg/models"
+//	    "git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
+//	    "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+//	)
+//
+//	// Read DBML
+//	reader := dbml.NewReader(&readers.ReaderOptions{
+//	    FilePath: "schema.dbml",
+//	})
+//	db, err := reader.ReadDatabase()
+//
+//	// Write GORM models
+//	writer := gorm.NewWriter(&writers.WriterOptions{
+//	    OutputPath:  "./models",
+//	    PackageName: "models",
+//	})
+//	err = writer.WriteDatabase(db)
+//
+// # Documentation
+//
+// Full documentation available at: https://git.warky.dev/wdevs/relspecgo
+//
+// API documentation: go doc git.warky.dev/wdevs/relspecgo/...
+//
+// # License
+//
+// See LICENSE file in the repository root.
+package relspecgo

docker-compose.yml

@@ -1,6 +1,21 @@
 version: '3.8'
 
 services:
+  mssql:
+    image: mcr.microsoft.com/mssql/server:2022-latest
+    environment:
+      - ACCEPT_EULA=Y
+      - SA_PASSWORD=StrongPassword123!
+      - MSSQL_PID=Express
+    ports:
+      - "1433:1433"
+    volumes:
+      - ./test_data/mssql/test_schema.sql:/test_schema.sql
+    healthcheck:
+      test: ["CMD", "/opt/mssql-tools/bin/sqlcmd", "-S", "localhost", "-U", "sa", "-P", "StrongPassword123!", "-Q", "SELECT 1"]
+      interval: 5s
+      timeout: 3s
+      retries: 10
   postgres:
     image: postgres:16-alpine
     container_name: relspec-test-postgres

docs/DOMAINS_DRAWDB.md

@@ -0,0 +1,149 @@
+# Domains and DrawDB Areas Integration
+
+## Overview
+
+Domains provide a way to organize tables from potentially multiple schemas into logical business groupings. When working with DrawDB format, domains are automatically imported/exported as **Subject Areas** - a native DrawDB feature for visually grouping tables.
+
+## How It Works
+
+### Writing Domains to DrawDB (Export)
+
+When you export a database with domains to DrawDB format:
+
+1. **Schema Areas** are created automatically for each schema (existing behavior)
+2. **Domain Areas** are created for each domain, calculated based on the positions of the tables they contain
+3. The domain area bounds are automatically calculated to encompass all its tables with a small padding
+
+```go
+// Example: Creating a domain and exporting to DrawDB
+db := models.InitDatabase("mydb")
+
+// Create an "authentication" domain
+authDomain := models.InitDomain("authentication")
+authDomain.Tables = append(authDomain.Tables,
+    models.InitDomainTable("users", "public"),
+    models.InitDomainTable("roles", "public"),
+    models.InitDomainTable("permissions", "public"),
+)
+db.Domains = append(db.Domains, authDomain)
+
+// Create a "financial" domain spanning multiple schemas
+finDomain := models.InitDomain("financial")
+finDomain.Tables = append(finDomain.Tables,
+    models.InitDomainTable("accounts", "public"),
+    models.InitDomainTable("transactions", "public"),
+    models.InitDomainTable("ledger", "finance"),  // Different schema!
+)
+db.Domains = append(db.Domains, finDomain)
+
+// Write to DrawDB - domains become subject areas
+writer := drawdb.NewWriter(&writers.WriterOptions{
+    OutputPath: "schema.json",
+})
+writer.WriteDatabase(db)
+```
+
+The resulting DrawDB JSON will have Subject Areas for both:
+- "authentication" area containing the auth tables
+- "financial" area containing the financial tables from both schemas
+
+### Reading Domains from DrawDB (Import)
+
+When you import a DrawDB file with Subject Areas:
+
+1. **Subject Areas** are automatically converted to **Domains**
+2. Tables are assigned to a domain if they fall within the area's visual bounds
+3. Table references include both the table name and schema name
+
+```go
+// Example: Reading DrawDB with areas
+reader := drawdb.NewReader(&readers.ReaderOptions{
+    FilePath: "schema.json",
+})
+
+db, err := reader.ReadDatabase()
+if err != nil {
+    log.Fatal(err)
+}
+
+// Access domains
+for _, domain := range db.Domains {
+    fmt.Printf("Domain: %s\n", domain.Name)
+    for _, domainTable := range domain.Tables {
+        fmt.Printf("  - %s.%s\n", domainTable.SchemaName, domainTable.TableName)
+        
+        // Access the actual table reference if loaded
+        if domainTable.RefTable != nil {
+            fmt.Printf("    Description: %s\n", domainTable.RefTable.Description)
+        }
+    }
+}
+```
+
+## Domain Structure
+
+```go
+type Domain struct {
+    Name        string         // Domain name (e.g., "authentication", "user_data")
+    Description string         // Optional human-readable description
+    Tables      []*DomainTable // Tables belonging to this domain
+    Comment     string         // Optional comment
+    Metadata    map[string]any // Extensible metadata
+    Sequence    uint           // Ordering hint
+}
+
+type DomainTable struct {
+    TableName  string // Table name
+    SchemaName string // Schema containing the table
+    Sequence   uint   // Ordering hint
+    RefTable   *Table // Pointer to actual table (in-memory only, not serialized)
+}
+```
+
+## Multi-Schema Domains
+
+One of the key features of domains is that they can span multiple schemas:
+
+```
+Domain: "user_data"
+├── public.users
+├── public.profiles
+├── public.user_preferences
+├── auth.user_sessions
+└── auth.mfa_devices
+```
+
+This allows you to organize related tables even when they're stored in different schemas.
+
+## Visual Organization in DrawDB
+
+When viewing the exported DrawDB file in DrawDB Editor:
+
+1. **Schema areas** appear in one color (original behavior)
+2. **Domain areas** appear in a different color
+3. Domain area bounds are calculated to fit all contained tables
+4. Areas can overlap - a table can visually belong to multiple areas
+
+## Integration with Other Formats
+
+Currently, domain/area integration is implemented for DrawDB format. 
+
+To implement similar functionality for other formats:
+
+1. Identify if the format has a native grouping/area feature
+2. Add conversion logic in the reader to map format areas → Domain model
+3. Add conversion logic in the writer to map Domain model → format areas
+
+Example formats that could support domains:
+- **DBML**: Could use DBML's `TableGroup` feature
+- **DrawDB**: ✅ Already implemented (Subject Areas)
+- **GraphQL**: Could use schema directives
+- **Custom formats**: Implement as needed
+
+## Tips and Best Practices
+
+1. **Keep domains focused**: Each domain should represent a distinct business area
+2. **Document purposes**: Use Description and Comment fields to explain each domain
+3. **Use meaningful names**: Domain names should clearly reflect their purpose
+4. **Maintain schema consistency**: Keep related tables together in the same schema when possible
+5. **Use metadata**: Store tool-specific information in the Metadata field

docs/TEMPLATE_MODE.md

@@ -0,0 +1,572 @@
+# RelSpec Template Mode
+
+The `templ` command allows you to transform database schemas using custom Go text templates. It provides powerful template functions and flexible execution modes for generating any type of output from your database schema.
+
+## Table of Contents
+
+- [Quick Start](#quick-start)
+- [Execution Modes](#execution-modes)
+- [Template Functions](#template-functions)
+  - [String Utilities](#string-utilities)
+  - [Type Conversion](#type-conversion)
+  - [Filtering](#filtering)
+  - [Formatting](#formatting)
+  - [Loop Helpers](#loop-helpers)
+  - [Sorting Helpers](#sorting-helpers)
+  - [Safe Access](#safe-access)
+  - [Utility Functions](#utility-functions)
+- [Data Model](#data-model)
+- [Examples](#examples)
+
+## Quick Start
+
+```bash
+# Generate documentation from a database
+relspec templ --from pgsql --from-conn "postgres://user:pass@localhost/db" \
+              --template docs.tmpl --output schema-docs.md
+
+# Generate TypeScript models (one file per table)
+relspec templ --from dbml --from-path schema.dbml \
+              --template model.tmpl --mode table \
+              --output ./models/ \
+              --filename-pattern "{{.Name | toCamelCase}}.ts"
+
+# Output to stdout
+relspec templ --from json --from-path schema.json \
+              --template report.tmpl
+```
+
+## Execution Modes
+
+The `--mode` flag controls how the template is executed:
+
+| Mode | Description | Output | When to Use |
+|------|-------------|--------|-------------|
+| `database` | Execute once for entire database | Single file | Documentation, reports, overview files |
+| `schema` | Execute once per schema | One file per schema | Schema-specific documentation |
+| `domain` | Execute once per domain | One file per domain | Domain-based documentation, domain exports |
+| `script` | Execute once per script | One file per script | Script processing |
+| `table` | Execute once per table | One file per table | Model generation, table docs |
+
+### Filename Patterns
+
+For multi-file modes (`schema`, `domain`, `script`, `table`), use `--filename-pattern` to control output filenames:
+
+```bash
+# Default pattern
+--filename-pattern "{{.Name}}.txt"
+
+# With transformations
+--filename-pattern "{{.Name | toCamelCase}}.ts"
+
+# Nested directories
+--filename-pattern "{{.Schema}}/{{.Name}}.md"
+
+# Complex patterns
+--filename-pattern "{{.ParentSchema.Name}}/models/{{.Name | toPascalCase}}Model.java"
+```
+
+## Template Functions
+
+### String Utilities
+
+Transform and manipulate strings in your templates.
+
+| Function | Description | Example | Output |
+|----------|-------------|---------|--------|
+| `toUpper` | Convert to uppercase | `{{ "hello" \| toUpper }}` | `HELLO` |
+| `toLower` | Convert to lowercase | `{{ "HELLO" \| toLower }}` | `hello` |
+| `toCamelCase` | Convert to camelCase | `{{ "user_name" \| toCamelCase }}` | `userName` |
+| `toPascalCase` | Convert to PascalCase | `{{ "user_name" \| toPascalCase }}` | `UserName` |
+| `toSnakeCase` | Convert to snake_case | `{{ "UserName" \| toSnakeCase }}` | `user_name` |
+| `toKebabCase` | Convert to kebab-case | `{{ "UserName" \| toKebabCase }}` | `user-name` |
+| `pluralize` | Convert to plural | `{{ "user" \| pluralize }}` | `users` |
+| `singularize` | Convert to singular | `{{ "users" \| singularize }}` | `user` |
+| `title` | Capitalize first letter | `{{ "hello world" \| title }}` | `Hello World` |
+| `trim` | Trim whitespace | `{{ "  hello  " \| trim }}` | `hello` |
+| `trimPrefix` | Remove prefix | `{{ trimPrefix "tbl_users" "tbl_" }}` | `users` |
+| `trimSuffix` | Remove suffix | `{{ trimSuffix "users_old" "_old" }}` | `users` |
+| `replace` | Replace occurrences | `{{ replace "hello" "l" "L" -1 }}` | `heLLo` |
+| `stringContains` | Check if contains substring | `{{ stringContains "hello" "ell" }}` | `true` |
+| `hasPrefix` | Check if starts with | `{{ hasPrefix "hello" "hel" }}` | `true` |
+| `hasSuffix` | Check if ends with | `{{ hasSuffix "hello" "llo" }}` | `true` |
+| `split` | Split by separator | `{{ split "a,b,c" "," }}` | `[a b c]` |
+| `join` | Join with separator | `{{ join (list "a" "b") "," }}` | `a,b` |
+
+### Type Conversion
+
+Convert SQL types to various programming language types.
+
+| Function | Parameters | Description | Example |
+|----------|------------|-------------|---------|
+| `sqlToGo` | `sqlType`, `nullable` | SQL to Go | `{{ sqlToGo "varchar" true }}` → `string` |
+| `sqlToTypeScript` | `sqlType`, `nullable` | SQL to TypeScript | `{{ sqlToTypeScript "integer" false }}` → `number \| null` |
+| `sqlToJava` | `sqlType`, `nullable` | SQL to Java | `{{ sqlToJava "varchar" true }}` → `String` |
+| `sqlToPython` | `sqlType` | SQL to Python | `{{ sqlToPython "integer" }}` → `int` |
+| `sqlToRust` | `sqlType`, `nullable` | SQL to Rust | `{{ sqlToRust "varchar" false }}` → `Option<String>` |
+| `sqlToCSharp` | `sqlType`, `nullable` | SQL to C# | `{{ sqlToCSharp "integer" false }}` → `int?` |
+| `sqlToPhp` | `sqlType`, `nullable` | SQL to PHP | `{{ sqlToPhp "varchar" false }}` → `?string` |
+
+**Supported SQL Types:**
+- Integer: `integer`, `int`, `smallint`, `bigint`, `serial`, `bigserial`
+- String: `text`, `varchar`, `char`, `character`, `citext`
+- Boolean: `boolean`, `bool`
+- Float: `real`, `float`, `double precision`, `numeric`, `decimal`
+- Date/Time: `timestamp`, `date`, `time`, `timestamptz`
+- Binary: `bytea`
+- Special: `uuid`, `json`, `jsonb`, `array`
+
+### Filtering
+
+Filter and select specific database objects.
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `filterTables` | Filter tables by pattern | `{{ filterTables .Schema.Tables "user_*" }}` |
+| `filterTablesByPattern` | Alias for filterTables | `{{ filterTablesByPattern .Schema.Tables "temp_*" }}` |
+| `filterColumns` | Filter columns by pattern | `{{ filterColumns .Table.Columns "*_id" }}` |
+| `filterColumnsByType` | Filter by SQL type | `{{ filterColumnsByType .Table.Columns "varchar" }}` |
+| `filterPrimaryKeys` | Get primary key columns | `{{ filterPrimaryKeys .Table.Columns }}` |
+| `filterForeignKeys` | Get foreign key constraints | `{{ filterForeignKeys .Table.Constraints }}` |
+| `filterUniqueConstraints` | Get unique constraints | `{{ filterUniqueConstraints .Table.Constraints }}` |
+| `filterCheckConstraints` | Get check constraints | `{{ filterCheckConstraints .Table.Constraints }}` |
+| `filterNullable` | Get nullable columns | `{{ filterNullable .Table.Columns }}` |
+| `filterNotNull` | Get non-nullable columns | `{{ filterNotNull .Table.Columns }}` |
+
+**Pattern Matching:**
+- `*` - Match any characters
+- `?` - Match single character
+- Example: `user_*` matches `user_profile`, `user_settings`
+
+### Formatting
+
+Format output and add structure to generated code.
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `toJSON` | Convert to JSON | `{{ .Database \| toJSON }}` |
+| `toJSONPretty` | Pretty-print JSON | `{{ toJSONPretty .Table "  " }}` |
+| `toYAML` | Convert to YAML | `{{ .Schema \| toYAML }}` |
+| `indent` | Indent by spaces | `{{ indent .Column.Description 4 }}` |
+| `indentWith` | Indent with prefix | `{{ indentWith .Comment "  " }}` |
+| `escape` | Escape special chars | `{{ escape .Column.Default }}` |
+| `escapeQuotes` | Escape quotes only | `{{ escapeQuotes .String }}` |
+| `comment` | Add comment prefix | `{{ comment .Description "//" }}` |
+| `quoteString` | Add quotes | `{{ quoteString "value" }}` → `"value"` |
+| `unquoteString` | Remove quotes | `{{ unquoteString "\"value\"" }}` → `value` |
+
+**Comment Styles:**
+- `//` - C/Go/JavaScript style
+- `#` - Python/Shell style
+- `--` - SQL style
+- `/* */` - Block comment style
+
+### Loop Helpers
+
+Iterate and manipulate collections.
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `enumerate` | Add index to items | `{{ range enumerate .Tables }}{{ .Index }}: {{ .Value.Name }}{{ end }}` |
+| `batch` | Split into chunks | `{{ range batch .Columns 3 }}...{{ end }}` |
+| `chunk` | Alias for batch | `{{ range chunk .Columns 5 }}...{{ end }}` |
+| `reverse` | Reverse order | `{{ range reverse .Tables }}...{{ end }}` |
+| `first` | Get first N items | `{{ range first .Tables 5 }}...{{ end }}` |
+| `last` | Get last N items | `{{ range last .Tables 3 }}...{{ end }}` |
+| `skip` | Skip first N items | `{{ range skip .Tables 2 }}...{{ end }}` |
+| `take` | Take first N (alias) | `{{ range take .Tables 10 }}...{{ end }}` |
+| `concat` | Concatenate slices | `{{ $all := concat .Schema1.Tables .Schema2.Tables }}` |
+| `unique` | Remove duplicates | `{{ $unique := unique .Items }}` |
+| `sortBy` | Sort by field | `{{ $sorted := sortBy .Tables "Name" }}` |
+| `groupBy` | Group by field | `{{ $grouped := groupBy .Tables "Schema" }}` |
+
+### Sorting Helpers
+
+Sort database objects by name or sequence number. All sort functions modify the slice in-place.
+
+**Schema Sorting:**
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `sortSchemasByName` | Sort schemas by name | `{{ sortSchemasByName .Database.Schemas false }}` |
+| `sortSchemasBySequence` | Sort schemas by sequence | `{{ sortSchemasBySequence .Database.Schemas false }}` |
+
+**Table Sorting:**
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `sortTablesByName` | Sort tables by name | `{{ sortTablesByName .Schema.Tables false }}` |
+| `sortTablesBySequence` | Sort tables by sequence | `{{ sortTablesBySequence .Schema.Tables true }}` |
+
+**Column Sorting:**
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `sortColumnsMapByName` | Convert column map to sorted slice by name | `{{ $cols := sortColumnsMapByName .Table.Columns false }}` |
+| `sortColumnsMapBySequence` | Convert column map to sorted slice by sequence | `{{ $cols := sortColumnsMapBySequence .Table.Columns false }}` |
+| `sortColumnsByName` | Sort column slice by name | `{{ sortColumnsByName $columns false }}` |
+| `sortColumnsBySequence` | Sort column slice by sequence | `{{ sortColumnsBySequence $columns true }}` |
+
+**Other Object Sorting:**
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `sortViewsByName` | Sort views by name | `{{ sortViewsByName .Schema.Views false }}` |
+| `sortViewsBySequence` | Sort views by sequence | `{{ sortViewsBySequence .Schema.Views false }}` |
+| `sortSequencesByName` | Sort sequences by name | `{{ sortSequencesByName .Schema.Sequences false }}` |
+| `sortSequencesBySequence` | Sort sequences by sequence | `{{ sortSequencesBySequence .Schema.Sequences false }}` |
+| `sortIndexesMapByName` | Convert index map to sorted slice by name | `{{ $idx := sortIndexesMapByName .Table.Indexes false }}` |
+| `sortIndexesMapBySequence` | Convert index map to sorted slice by sequence | `{{ $idx := sortIndexesMapBySequence .Table.Indexes false }}` |
+| `sortIndexesByName` | Sort index slice by name | `{{ sortIndexesByName $indexes false }}` |
+| `sortIndexesBySequence` | Sort index slice by sequence | `{{ sortIndexesBySequence $indexes false }}` |
+| `sortConstraintsMapByName` | Convert constraint map to sorted slice by name | `{{ $cons := sortConstraintsMapByName .Table.Constraints false }}` |
+| `sortConstraintsByName` | Sort constraint slice by name | `{{ sortConstraintsByName $constraints false }}` |
+| `sortRelationshipsMapByName` | Convert relationship map to sorted slice by name | `{{ $rels := sortRelationshipsMapByName .Table.Relationships false }}` |
+| `sortRelationshipsByName` | Sort relationship slice by name | `{{ sortRelationshipsByName $relationships false }}` |
+| `sortScriptsByName` | Sort scripts by name | `{{ sortScriptsByName .Schema.Scripts false }}` |
+| `sortEnumsByName` | Sort enums by name | `{{ sortEnumsByName .Schema.Enums false }}` |
+
+**Sort Parameters:**
+- Second parameter: `false` = ascending, `true` = descending
+- Example: `{{ sortTablesByName .Schema.Tables true }}` sorts descending (Z-A)
+
+### Safe Access
+
+Safely access nested data without panicking.
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `get` | Get map value | `{{ get .Metadata "key" }}` |
+| `getOr` | Get with default | `{{ getOr .Metadata "key" "default" }}` |
+| `getPath` | Nested access | `{{ getPath .Config "database.host" }}` |
+| `getPathOr` | Nested with default | `{{ getPathOr .Config "db.port" 5432 }}` |
+| `safeIndex` | Safe array access | `{{ safeIndex .Tables 0 }}` |
+| `safeIndexOr` | Safe with default | `{{ safeIndexOr .Tables 0 nil }}` |
+| `has` | Check key exists | `{{ if has .Metadata "key" }}...{{ end }}` |
+| `hasPath` | Check nested path | `{{ if hasPath .Config "db.host" }}...{{ end }}` |
+| `keys` | Get map keys | `{{ range keys .Metadata }}...{{ end }}` |
+| `values` | Get map values | `{{ range values .Table.Columns }}...{{ end }}` |
+| `merge` | Merge maps | `{{ $merged := merge .Map1 .Map2 }}` |
+| `pick` | Select keys | `{{ $subset := pick .Metadata "name" "desc" }}` |
+| `omit` | Exclude keys | `{{ $filtered := omit .Metadata "internal" }}` |
+| `sliceContains` | Check contains | `{{ if sliceContains .Names "admin" }}...{{ end }}` |
+| `indexOf` | Find index | `{{ $idx := indexOf .Names "admin" }}` |
+| `pluck` | Extract field | `{{ $names := pluck .Tables "Name" }}` |
+
+### Utility Functions
+
+General-purpose template helpers.
+
+| Function | Description | Example |
+|----------|-------------|---------|
+| `add` | Add numbers | `{{ add 5 3 }}` → `8` |
+| `sub` | Subtract | `{{ sub 10 3 }}` → `7` |
+| `mul` | Multiply | `{{ mul 4 5 }}` → `20` |
+| `div` | Divide | `{{ div 10 2 }}` → `5` |
+| `mod` | Modulo | `{{ mod 10 3 }}` → `1` |
+| `default` | Default value | `{{ default "unknown" .Name }}` |
+| `dict` | Create map | `{{ $m := dict "key1" "val1" "key2" "val2" }}` |
+| `list` | Create list | `{{ $l := list "a" "b" "c" }}` |
+| `seq` | Number sequence | `{{ range seq 1 5 }}{{ . }}{{ end }}` → `12345` |
+
+## Data Model
+
+The data available in templates depends on the execution mode:
+
+### Database Mode
+```go
+.Database          // *models.Database - Full database
+.ParentDatabase    // *models.Database - Same as .Database
+.FlatColumns       // []*models.FlatColumn - All columns flattened
+.FlatTables        // []*models.FlatTable - All tables flattened
+.FlatConstraints   // []*models.FlatConstraint - All constraints
+.FlatRelationships // []*models.FlatRelationship - All relationships
+.Summary           // *models.DatabaseSummary - Statistics
+.Metadata          // map[string]interface{} - User metadata
+```
+
+### Schema Mode
+```go
+.Schema            // *models.Schema - Current schema
+.ParentDatabase    // *models.Database - Parent database context
+.FlatColumns       // []*models.FlatColumn - Schema's columns flattened
+.FlatTables        // []*models.FlatTable - Schema's tables flattened
+.FlatConstraints   // []*models.FlatConstraint - Schema's constraints
+.FlatRelationships // []*models.FlatRelationship - Schema's relationships
+.Summary           // *models.DatabaseSummary - Statistics
+.Metadata          // map[string]interface{} - User metadata
+```
+
+### Domain Mode
+```go
+.Domain            // *models.Domain - Current domain
+.ParentDatabase    // *models.Database - Parent database context
+.Metadata          // map[string]interface{} - User metadata
+```
+
+### Table Mode
+```go
+.Table             // *models.Table - Current table
+.ParentSchema      // *models.Schema - Parent schema
+.ParentDatabase    // *models.Database - Parent database context
+.Metadata          // map[string]interface{} - User metadata
+```
+
+### Script Mode
+```go
+.Script            // *models.Script - Current script
+.ParentSchema      // *models.Schema - Parent schema
+.ParentDatabase    // *models.Database - Parent database context
+.Metadata          // map[string]interface{} - User metadata
+```
+
+### Model Structures
+
+**Database:**
+- `.Name` - Database name
+- `.Schemas` - List of schemas
+- `.Domains` - List of domains (business domain groupings)
+- `.Description`, `.Comment` - Documentation
+
+**Schema:**
+- `.Name` - Schema name
+- `.Tables` - List of tables
+- `.Views`, `.Sequences`, `.Scripts` - Other objects
+- `.Enums` - Enum types
+
+**Domain:**
+- `.Name` - Domain name
+- `.Tables` - List of DomainTable references
+- `.Description`, `.Comment` - Documentation
+- `.Metadata` - Custom metadata map
+
+**DomainTable:**
+- `.TableName` - Name of the table
+- `.SchemaName` - Schema containing the table
+- `.RefTable` - Pointer to actual Table object (if loaded)
+
+**Table:**
+- `.Name` - Table name
+- `.Schema` - Schema name
+- `.Columns` - Map of columns (use `values` function to iterate)
+- `.Constraints` - Map of constraints
+- `.Indexes` - Map of indexes
+- `.Relationships` - Map of relationships
+- `.Description`, `.Comment` - Documentation
+
+**Column:**
+- `.Name` - Column name
+- `.Type` - SQL type
+- `.NotNull` - Is NOT NULL
+- `.IsPrimaryKey` - Is primary key
+- `.Default` - Default value
+- `.Description`, `.Comment` - Documentation
+
+## Examples
+
+### Example 1: TypeScript Interfaces (Table Mode)
+
+**Template:** `typescript-interface.tmpl`
+```typescript
+// Generated from {{ .ParentDatabase.Name }}.{{ .ParentSchema.Name }}.{{ .Table.Name }}
+
+export interface {{ .Table.Name | toPascalCase }} {
+{{- range .Table.Columns | values }}
+  {{ .Name | toCamelCase }}: {{ sqlToTypeScript .Type .NotNull }};
+{{- end }}
+}
+
+{{- $fks := filterForeignKeys .Table.Constraints }}
+{{- if $fks }}
+
+// Foreign Keys:
+{{- range $fks }}
+// - {{ .Name }}: references {{ .ReferencedTable }}
+{{- end }}
+{{- end }}
+```
+
+**Command:**
+```bash
+relspec templ --from pgsql --from-conn "..." \
+              --template typescript-interface.tmpl \
+              --mode table \
+              --output ./src/types/ \
+              --filename-pattern "{{.Name | toCamelCase}}.ts"
+```
+
+### Example 2: Markdown Documentation (Database Mode)
+
+**Template:** `database-docs.tmpl`
+```markdown
+# Database: {{ .Database.Name }}
+
+{{ if .Database.Description }}{{ .Database.Description }}{{ end }}
+
+**Statistics:**
+- Schemas: {{ len .Database.Schemas }}
+- Tables: {{ .Summary.TotalTables }}
+- Columns: {{ .Summary.TotalColumns }}
+
+{{ range .Database.Schemas }}
+## Schema: {{ .Name }}
+
+{{ range .Tables }}
+### {{ .Name }}
+
+{{ if .Description }}{{ .Description }}{{ end }}
+
+**Columns:**
+
+| Column | Type | Nullable | PK | Description |
+|--------|------|----------|----|----|
+{{- range .Columns | values }}
+| {{ .Name }} | `{{ .Type }}` | {{ if .NotNull }}No{{ else }}Yes{{ end }} | {{ if .IsPrimaryKey }}✓{{ end }} | {{ .Description }} |
+{{- end }}
+
+{{- $fks := filterForeignKeys .Constraints }}
+{{- if $fks }}
+
+**Foreign Keys:**
+
+{{ range $fks }}
+- `{{ .Name }}`: {{ join .Columns ", " }} → {{ .ReferencedTable }}({{ join .ReferencedColumns ", " }})
+{{- end }}
+{{- end }}
+
+{{ end }}
+{{ end }}
+```
+
+### Example 3: Python SQLAlchemy Models (Table Mode)
+
+**Template:** `python-model.tmpl`
+```python
+"""{{ .Table.Name | toPascalCase }} model for {{ .ParentDatabase.Name }}.{{ .ParentSchema.Name }}"""
+
+from sqlalchemy import Column
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+
+
+class {{ .Table.Name | toPascalCase }}(Base):
+    """{{ if .Table.Description }}{{ .Table.Description }}{{ else }}{{ .Table.Name }} table{{ end }}"""
+
+    __tablename__ = "{{ .Table.Name }}"
+    __table_args__ = {"schema": "{{ .ParentSchema.Name }}"}
+
+    {{- range .Table.Columns | values }}
+    {{ .Name }} = Column({{ sqlToPython .Type }}{{ if .IsPrimaryKey }}, primary_key=True{{ end }}{{ if .NotNull }}, nullable=False{{ end }})
+    {{- end }}
+```
+
+### Example 4: GraphQL Schema (Schema Mode)
+
+**Template:** `graphql-schema.tmpl`
+```graphql
+"""{{ .Schema.Name }} schema"""
+
+{{ range .Schema.Tables }}
+type {{ .Name | toPascalCase }} {
+{{- range .Columns | values }}
+  {{ .Name | toCamelCase }}: {{ sqlToTypeScript .Type .NotNull | replace " | null" "" }}{{ if not .NotNull }}{{ end }}
+{{- end }}
+}
+
+input {{ .Name | toPascalCase }}Input {
+{{- $cols := filterNotNull .Columns | filterPrimaryKeys }}
+{{- range $cols }}
+  {{ .Name | toCamelCase }}: {{ sqlToTypeScript .Type true | replace " | null" "" }}!
+{{- end }}
+}
+
+{{ end }}
+```
+
+### Example 5: SQL Migration (Database Mode)
+
+**Template:** `migration.tmpl`
+```sql
+-- Migration for {{ .Database.Name }}
+-- Generated: {{ .Metadata.timestamp }}
+
+BEGIN;
+
+{{ range .Database.Schemas }}
+-- Schema: {{ .Name }}
+CREATE SCHEMA IF NOT EXISTS {{ .Name }};
+
+{{ range .Tables }}
+CREATE TABLE {{ $.Database.Name }}.{{ .Schema }}.{{ .Name }} (
+{{- range $i, $col := .Columns | values }}
+{{- if $i }},{{ end }}
+  {{ $col.Name }} {{ $col.Type }}{{ if $col.NotNull }} NOT NULL{{ end }}{{ if $col.Default }} DEFAULT {{ $col.Default }}{{ end }}
+{{- end }}
+);
+
+{{- $pks := filterPrimaryKeys .Columns }}
+{{- if $pks }}
+
+ALTER TABLE {{ $.Database.Name }}.{{ .Schema }}.{{ .Name }}
+  ADD PRIMARY KEY ({{ range $i, $pk := $pks }}{{ if $i }}, {{ end }}{{ $pk.Name }}{{ end }});
+{{- end }}
+
+{{ end }}
+{{ end }}
+
+COMMIT;
+```
+
+## Best Practices
+
+1. **Use Hyphen for Whitespace Control:**
+   ```
+   {{- removes whitespace before
+   -}} removes whitespace after
+   ```
+
+2. **Store Intermediate Results:**
+   ```
+   {{ $pks := filterPrimaryKeys .Table.Columns }}
+   {{ if $pks }}...{{ end }}
+   ```
+
+3. **Check Before Accessing:**
+   ```
+   {{ if .Table.Description }}{{ .Table.Description }}{{ end }}
+   ```
+
+4. **Use Safe Access for Maps:**
+   ```
+   {{ getOr .Metadata "key" "default-value" }}
+   ```
+
+5. **Iterate Map Values:**
+   ```
+   {{ range .Table.Columns | values }}...{{ end }}
+   ```
+
+## Troubleshooting
+
+**Error: "wrong type for value"**
+- Check function parameter order (e.g., `sqlToGo .Type .NotNull` not `.NotNull .Type`)
+
+**Error: "can't evaluate field"**
+- Field doesn't exist on the object
+- Use `{{ if .Field }}` to check before accessing
+
+**Empty Output:**
+- Check your mode matches your template expectations
+- Verify data exists (use `{{ .Database | toJSON }}` to inspect)
+
+**Whitespace Issues:**
+- Use `{{-` and `-}}` to control whitespace
+- Run output through a formatter if needed
+
+## Additional Resources
+
+- [Go Template Documentation](https://pkg.go.dev/text/template)
+- [RelSpec Documentation](../README.md)
+- [Model Structure Reference](../pkg/models/)
+- [Example Templates](../examples/templates/)

go.mod

@@ -3,29 +3,49 @@ module git.warky.dev/wdevs/relspecgo
 go 1.24.0
 
 require (
+	github.com/gdamore/tcell/v2 v2.8.1
 	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.7.6
+	github.com/microsoft/go-mssqldb v1.9.6
+	github.com/rivo/tview v0.42.0
 	github.com/spf13/cobra v1.10.2
 	github.com/stretchr/testify v1.11.1
 	github.com/uptrace/bun v1.2.16
+	golang.org/x/text v0.31.0
 	gopkg.in/yaml.v3 v3.0.1
+	modernc.org/sqlite v1.44.3
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/gdamore/encoding v1.0.1 // indirect
+	github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 // indirect
+	github.com/golang-sql/sqlexp v0.1.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/kr/pretty v0.3.1 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	github.com/shopspring/decimal v1.4.0 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc // indirect
 	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
 	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
-	golang.org/x/crypto v0.41.0 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
 	golang.org/x/sys v0.38.0 // indirect
-	golang.org/x/text v0.28.0 // indirect
+	golang.org/x/term v0.37.0 // indirect
+	modernc.org/libc v1.67.6 // indirect
+	modernc.org/mathutil v1.7.1 // indirect
+	modernc.org/memory v1.11.0 // indirect
 )

go.sum

@@ -1,10 +1,39 @@
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.18.0 h1:Gt0j3wceWMwPmiazCa8MzMA0MfhmPIz0Qp0FJ6qcM0U=
+github.com/Azure/azure-sdk-for-go/sdk/azcore v1.18.0/go.mod h1:Ot/6aikWnKWi4l9QB7qVSwa8iMphQNqkWALMoNT3rzM=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.10.1 h1:B+blDbyVIG3WaikNxPnhPiJ1MThR03b3vKGtER95TP4=
+github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.10.1/go.mod h1:JdM5psgjfBf5fo2uWOZhflPWyDBZ/O/CNAH9CtsuZE4=
+github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.1 h1:FPKJS1T+clwv+OLGt13a8UjqeRuh0O4SJ3lUriThc+4=
+github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.1/go.mod h1:j2chePtV91HrC22tGoRX3sGY42uF13WzmmV80/OdVAA=
+github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.3.1 h1:Wgf5rZba3YZqeTNJPtvqZoBu1sBN/L4sry+u2U3Y75w=
+github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/azkeys v1.3.1/go.mod h1:xxCBG/f/4Vbmh2XQJBsOmNdxWUY5j/s27jujKPbQf14=
+github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.1.1 h1:bFWuoEKg+gImo7pvkiQEFAc8ocibADgXeiLAxWhWmkI=
+github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.1.1/go.mod h1:Vih/3yc6yac2JzU4hzpaDupBJP0Flaia9rXXrU8xyww=
+github.com/AzureAD/microsoft-authentication-library-for-go v1.4.2 h1:oygO0locgZJe7PpYPXT5A29ZkwJaPqcva7BVeemZOZs=
+github.com/AzureAD/microsoft-authentication-library-for-go v1.4.2/go.mod h1:wP83P5OoQ5p6ip3ScPr0BAq0BvuPAvacpEuSzyouqAI=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/gdamore/encoding v1.0.1 h1:YzKZckdBL6jVt2Gc+5p82qhrGiqMdG/eNs6Wy0u3Uhw=
+github.com/gdamore/encoding v1.0.1/go.mod h1:0Z0cMFinngz9kS1QfMjCP8TY7em3bZYeeklsSDPivEo=
+github.com/gdamore/tcell/v2 v2.8.1 h1:KPNxyqclpWpWQlPLx6Xui1pMk8S+7+R37h3g07997NU=
+github.com/gdamore/tcell/v2 v2.8.1/go.mod h1:bj8ori1BG3OYMjmb3IklZVWfZUJ1UBQt9JXrOCOhGWw=
+github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
+github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
+github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 h1:au07oEsX2xN0ktxqI+Sida1w446QrXBRJ0nee3SNZlA=
+github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
+github.com/golang-sql/sqlexp v0.1.0 h1:ZCD6MBpcuOVfGVqsEmY5/4FtYiKz6tSyUv9LPEDei6A=
+github.com/golang-sql/sqlexp v0.1.0/go.mod h1:J4ad9Vo8ZCWQ2GMrC4UCQy1JpCbwU9m3EOqtpKwwwHI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
+github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
@@ -21,15 +50,39 @@ github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
+github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
+github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/microsoft/go-mssqldb v1.9.6 h1:1MNQg5UiSsokiPz3++K2KPx4moKrwIqly1wv+RyCKTw=
+github.com/microsoft/go-mssqldb v1.9.6/go.mod h1:yYMPDufyoF2vVuVCUGtZARr06DKFIhMrluTcgWlXpr4=
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pkg/commontypes/commontypes_test.go

@@ -0,0 +1,714 @@
+package commontypes
+
+import (
+	"testing"
+)
+
+func TestExtractBaseType(t *testing.T) {
+	tests := []struct {
+		name    string
+		sqlType string
+		want    string
+	}{
+		{"varchar with length", "varchar(100)", "varchar"},
+		{"VARCHAR uppercase with length", "VARCHAR(255)", "varchar"},
+		{"numeric with precision", "numeric(10,2)", "numeric"},
+		{"NUMERIC uppercase", "NUMERIC(18,4)", "numeric"},
+		{"decimal with precision", "decimal(15,3)", "decimal"},
+		{"char with length", "char(50)", "char"},
+		{"simple integer", "integer", "integer"},
+		{"simple text", "text", "text"},
+		{"bigint", "bigint", "bigint"},
+		{"With spaces", " varchar(100) ", "varchar"},
+		{"No parentheses", "boolean", "boolean"},
+		{"Empty string", "", ""},
+		{"Mixed case", "VarChar(100)", "varchar"},
+		{"timestamp with time zone", "timestamp(6) with time zone", "timestamp"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := ExtractBaseType(tt.sqlType)
+			if got != tt.want {
+				t.Errorf("ExtractBaseType(%q) = %q, want %q", tt.sqlType, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestNormalizeType(t *testing.T) {
+	// NormalizeType is an alias for ExtractBaseType, test that they behave the same
+	testCases := []string{
+		"varchar(100)",
+		"numeric(10,2)",
+		"integer",
+		"text",
+		" VARCHAR(255) ",
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc, func(t *testing.T) {
+			extracted := ExtractBaseType(tc)
+			normalized := NormalizeType(tc)
+			if extracted != normalized {
+				t.Errorf("ExtractBaseType(%q) = %q, but NormalizeType(%q) = %q",
+					tc, extracted, tc, normalized)
+			}
+		})
+	}
+}
+
+func TestSQLToGo(t *testing.T) {
+	tests := []struct {
+		name     string
+		sqlType  string
+		nullable bool
+		want     string
+	}{
+		// Integer types (nullable)
+		{"integer nullable", "integer", true, "int32"},
+		{"bigint nullable", "bigint", true, "int64"},
+		{"smallint nullable", "smallint", true, "int16"},
+		{"serial nullable", "serial", true, "int32"},
+
+		// Integer types (not nullable)
+		{"integer not nullable", "integer", false, "*int32"},
+		{"bigint not nullable", "bigint", false, "*int64"},
+		{"smallint not nullable", "smallint", false, "*int16"},
+
+		// String types (nullable)
+		{"text nullable", "text", true, "string"},
+		{"varchar nullable", "varchar", true, "string"},
+		{"varchar with length nullable", "varchar(100)", true, "string"},
+
+		// String types (not nullable)
+		{"text not nullable", "text", false, "*string"},
+		{"varchar not nullable", "varchar", false, "*string"},
+
+		// Boolean
+		{"boolean nullable", "boolean", true, "bool"},
+		{"boolean not nullable", "boolean", false, "*bool"},
+
+		// Float types
+		{"real nullable", "real", true, "float32"},
+		{"double precision nullable", "double precision", true, "float64"},
+		{"real not nullable", "real", false, "*float32"},
+		{"double precision not nullable", "double precision", false, "*float64"},
+
+		// Date/Time types
+		{"timestamp nullable", "timestamp", true, "time.Time"},
+		{"date nullable", "date", true, "time.Time"},
+		{"timestamp not nullable", "timestamp", false, "*time.Time"},
+
+		// Binary
+		{"bytea nullable", "bytea", true, "[]byte"},
+		{"bytea not nullable", "bytea", false, "[]byte"}, // Slices don't get pointer
+
+		// UUID
+		{"uuid nullable", "uuid", true, "string"},
+		{"uuid not nullable", "uuid", false, "*string"},
+
+		// JSON
+		{"json nullable", "json", true, "string"},
+		{"jsonb nullable", "jsonb", true, "string"},
+
+		// Array
+		{"array nullable", "array", true, "[]string"},
+		{"array not nullable", "array", false, "[]string"}, // Slices don't get pointer
+
+		// Unknown types
+		{"unknown type nullable", "unknowntype", true, "interface{}"},
+		{"unknown type not nullable", "unknowntype", false, "interface{}"}, // Interface doesn't get pointer
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToGo(tt.sqlType, tt.nullable)
+			if got != tt.want {
+				t.Errorf("SQLToGo(%q, %v) = %q, want %q", tt.sqlType, tt.nullable, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSQLToTypeScript(t *testing.T) {
+	tests := []struct {
+		name     string
+		sqlType  string
+		nullable bool
+		want     string
+	}{
+		// Integer types
+		{"integer nullable", "integer", true, "number"},
+		{"integer not nullable", "integer", false, "number | null"},
+		{"bigint nullable", "bigint", true, "number"},
+		{"bigint not nullable", "bigint", false, "number | null"},
+
+		// String types
+		{"text nullable", "text", true, "string"},
+		{"text not nullable", "text", false, "string | null"},
+		{"varchar nullable", "varchar", true, "string"},
+		{"varchar(100) nullable", "varchar(100)", true, "string"},
+
+		// Boolean
+		{"boolean nullable", "boolean", true, "boolean"},
+		{"boolean not nullable", "boolean", false, "boolean | null"},
+
+		// Float types
+		{"real nullable", "real", true, "number"},
+		{"double precision nullable", "double precision", true, "number"},
+
+		// Date/Time types
+		{"timestamp nullable", "timestamp", true, "Date"},
+		{"date nullable", "date", true, "Date"},
+		{"timestamp not nullable", "timestamp", false, "Date | null"},
+
+		// Binary
+		{"bytea nullable", "bytea", true, "Buffer"},
+		{"bytea not nullable", "bytea", false, "Buffer | null"},
+
+		// JSON
+		{"json nullable", "json", true, "any"},
+		{"jsonb nullable", "jsonb", true, "any"},
+
+		// UUID
+		{"uuid nullable", "uuid", true, "string"},
+
+		// Unknown types
+		{"unknown type nullable", "unknowntype", true, "any"},
+		{"unknown type not nullable", "unknowntype", false, "any | null"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToTypeScript(tt.sqlType, tt.nullable)
+			if got != tt.want {
+				t.Errorf("SQLToTypeScript(%q, %v) = %q, want %q", tt.sqlType, tt.nullable, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSQLToPython(t *testing.T) {
+	tests := []struct {
+		name    string
+		sqlType string
+		want    string
+	}{
+		// Integer types
+		{"integer", "integer", "int"},
+		{"bigint", "bigint", "int"},
+		{"smallint", "smallint", "int"},
+
+		// String types
+		{"text", "text", "str"},
+		{"varchar", "varchar", "str"},
+		{"varchar(100)", "varchar(100)", "str"},
+
+		// Boolean
+		{"boolean", "boolean", "bool"},
+
+		// Float types
+		{"real", "real", "float"},
+		{"double precision", "double precision", "float"},
+		{"numeric", "numeric", "Decimal"},
+		{"decimal", "decimal", "Decimal"},
+
+		// Date/Time types
+		{"timestamp", "timestamp", "datetime"},
+		{"date", "date", "date"},
+		{"time", "time", "time"},
+
+		// Binary
+		{"bytea", "bytea", "bytes"},
+
+		// JSON
+		{"json", "json", "dict"},
+		{"jsonb", "jsonb", "dict"},
+
+		// UUID
+		{"uuid", "uuid", "UUID"},
+
+		// Array
+		{"array", "array", "list"},
+
+		// Unknown types
+		{"unknown type", "unknowntype", "Any"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToPython(tt.sqlType)
+			if got != tt.want {
+				t.Errorf("SQLToPython(%q) = %q, want %q", tt.sqlType, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSQLToCSharp(t *testing.T) {
+	tests := []struct {
+		name     string
+		sqlType  string
+		nullable bool
+		want     string
+	}{
+		// Integer types (nullable)
+		{"integer nullable", "integer", true, "int"},
+		{"bigint nullable", "bigint", true, "long"},
+		{"smallint nullable", "smallint", true, "short"},
+
+		// Integer types (not nullable - value types get ?)
+		{"integer not nullable", "integer", false, "int?"},
+		{"bigint not nullable", "bigint", false, "long?"},
+		{"smallint not nullable", "smallint", false, "short?"},
+
+		// String types (reference types, no ? needed)
+		{"text nullable", "text", true, "string"},
+		{"text not nullable", "text", false, "string"},
+		{"varchar nullable", "varchar", true, "string"},
+		{"varchar(100) nullable", "varchar(100)", true, "string"},
+
+		// Boolean
+		{"boolean nullable", "boolean", true, "bool"},
+		{"boolean not nullable", "boolean", false, "bool?"},
+
+		// Float types
+		{"real nullable", "real", true, "float"},
+		{"double precision nullable", "double precision", true, "double"},
+		{"decimal nullable", "decimal", true, "decimal"},
+		{"real not nullable", "real", false, "float?"},
+		{"double precision not nullable", "double precision", false, "double?"},
+		{"decimal not nullable", "decimal", false, "decimal?"},
+
+		// Date/Time types
+		{"timestamp nullable", "timestamp", true, "DateTime"},
+		{"date nullable", "date", true, "DateTime"},
+		{"timestamptz nullable", "timestamptz", true, "DateTimeOffset"},
+		{"timestamp not nullable", "timestamp", false, "DateTime?"},
+		{"timestamptz not nullable", "timestamptz", false, "DateTimeOffset?"},
+
+		// Binary (array type, no ?)
+		{"bytea nullable", "bytea", true, "byte[]"},
+		{"bytea not nullable", "bytea", false, "byte[]"},
+
+		// UUID
+		{"uuid nullable", "uuid", true, "Guid"},
+		{"uuid not nullable", "uuid", false, "Guid?"},
+
+		// JSON
+		{"json nullable", "json", true, "string"},
+
+		// Unknown types (object is reference type)
+		{"unknown type nullable", "unknowntype", true, "object"},
+		{"unknown type not nullable", "unknowntype", false, "object"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToCSharp(tt.sqlType, tt.nullable)
+			if got != tt.want {
+				t.Errorf("SQLToCSharp(%q, %v) = %q, want %q", tt.sqlType, tt.nullable, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestNeedsTimeImport(t *testing.T) {
+	tests := []struct {
+		name   string
+		goType string
+		want   bool
+	}{
+		{"time.Time type", "time.Time", true},
+		{"pointer to time.Time", "*time.Time", true},
+		{"int32 type", "int32", false},
+		{"string type", "string", false},
+		{"bool type", "bool", false},
+		{"[]byte type", "[]byte", false},
+		{"interface{}", "interface{}", false},
+		{"empty string", "", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := NeedsTimeImport(tt.goType)
+			if got != tt.want {
+				t.Errorf("NeedsTimeImport(%q) = %v, want %v", tt.goType, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGoTypeMap(t *testing.T) {
+	// Test that the map contains expected entries
+	expectedMappings := map[string]string{
+		"integer":          "int32",
+		"bigint":           "int64",
+		"text":             "string",
+		"boolean":          "bool",
+		"double precision": "float64",
+		"bytea":            "[]byte",
+		"timestamp":        "time.Time",
+		"uuid":             "string",
+		"json":             "string",
+	}
+
+	for sqlType, expectedGoType := range expectedMappings {
+		if goType, ok := GoTypeMap[sqlType]; !ok {
+			t.Errorf("GoTypeMap missing entry for %q", sqlType)
+		} else if goType != expectedGoType {
+			t.Errorf("GoTypeMap[%q] = %q, want %q", sqlType, goType, expectedGoType)
+		}
+	}
+
+	if len(GoTypeMap) == 0 {
+		t.Error("GoTypeMap is empty")
+	}
+}
+
+func TestTypeScriptTypeMap(t *testing.T) {
+	expectedMappings := map[string]string{
+		"integer":          "number",
+		"bigint":           "number",
+		"text":             "string",
+		"boolean":          "boolean",
+		"double precision": "number",
+		"bytea":            "Buffer",
+		"timestamp":        "Date",
+		"uuid":             "string",
+		"json":             "any",
+	}
+
+	for sqlType, expectedTSType := range expectedMappings {
+		if tsType, ok := TypeScriptTypeMap[sqlType]; !ok {
+			t.Errorf("TypeScriptTypeMap missing entry for %q", sqlType)
+		} else if tsType != expectedTSType {
+			t.Errorf("TypeScriptTypeMap[%q] = %q, want %q", sqlType, tsType, expectedTSType)
+		}
+	}
+
+	if len(TypeScriptTypeMap) == 0 {
+		t.Error("TypeScriptTypeMap is empty")
+	}
+}
+
+func TestPythonTypeMap(t *testing.T) {
+	expectedMappings := map[string]string{
+		"integer": "int",
+		"bigint":  "int",
+		"text":    "str",
+		"boolean": "bool",
+		"real":    "float",
+		"numeric": "Decimal",
+		"bytea":   "bytes",
+		"date":    "date",
+		"uuid":    "UUID",
+		"json":    "dict",
+	}
+
+	for sqlType, expectedPyType := range expectedMappings {
+		if pyType, ok := PythonTypeMap[sqlType]; !ok {
+			t.Errorf("PythonTypeMap missing entry for %q", sqlType)
+		} else if pyType != expectedPyType {
+			t.Errorf("PythonTypeMap[%q] = %q, want %q", sqlType, pyType, expectedPyType)
+		}
+	}
+
+	if len(PythonTypeMap) == 0 {
+		t.Error("PythonTypeMap is empty")
+	}
+}
+
+func TestCSharpTypeMap(t *testing.T) {
+	expectedMappings := map[string]string{
+		"integer":          "int",
+		"bigint":           "long",
+		"smallint":         "short",
+		"text":             "string",
+		"boolean":          "bool",
+		"double precision": "double",
+		"decimal":          "decimal",
+		"bytea":            "byte[]",
+		"timestamp":        "DateTime",
+		"uuid":             "Guid",
+		"json":             "string",
+	}
+
+	for sqlType, expectedCSType := range expectedMappings {
+		if csType, ok := CSharpTypeMap[sqlType]; !ok {
+			t.Errorf("CSharpTypeMap missing entry for %q", sqlType)
+		} else if csType != expectedCSType {
+			t.Errorf("CSharpTypeMap[%q] = %q, want %q", sqlType, csType, expectedCSType)
+		}
+	}
+
+	if len(CSharpTypeMap) == 0 {
+		t.Error("CSharpTypeMap is empty")
+	}
+}
+
+func TestSQLToJava(t *testing.T) {
+	tests := []struct {
+		name     string
+		sqlType  string
+		nullable bool
+		want     string
+	}{
+		// Integer types
+		{"integer nullable", "integer", true, "Integer"},
+		{"integer not nullable", "integer", false, "Integer"},
+		{"bigint nullable", "bigint", true, "Long"},
+		{"smallint nullable", "smallint", true, "Short"},
+
+		// String types
+		{"text nullable", "text", true, "String"},
+		{"varchar nullable", "varchar", true, "String"},
+		{"varchar(100) nullable", "varchar(100)", true, "String"},
+
+		// Boolean
+		{"boolean nullable", "boolean", true, "Boolean"},
+
+		// Float types
+		{"real nullable", "real", true, "Float"},
+		{"double precision nullable", "double precision", true, "Double"},
+		{"numeric nullable", "numeric", true, "BigDecimal"},
+
+		// Date/Time types
+		{"timestamp nullable", "timestamp", true, "Timestamp"},
+		{"date nullable", "date", true, "Date"},
+		{"time nullable", "time", true, "Time"},
+
+		// Binary
+		{"bytea nullable", "bytea", true, "byte[]"},
+
+		// UUID
+		{"uuid nullable", "uuid", true, "UUID"},
+
+		// JSON
+		{"json nullable", "json", true, "String"},
+
+		// Unknown types
+		{"unknown type nullable", "unknowntype", true, "Object"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToJava(tt.sqlType, tt.nullable)
+			if got != tt.want {
+				t.Errorf("SQLToJava(%q, %v) = %q, want %q", tt.sqlType, tt.nullable, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSQLToPhp(t *testing.T) {
+	tests := []struct {
+		name     string
+		sqlType  string
+		nullable bool
+		want     string
+	}{
+		// Integer types (nullable)
+		{"integer nullable", "integer", true, "int"},
+		{"bigint nullable", "bigint", true, "int"},
+		{"smallint nullable", "smallint", true, "int"},
+
+		// Integer types (not nullable)
+		{"integer not nullable", "integer", false, "?int"},
+		{"bigint not nullable", "bigint", false, "?int"},
+
+		// String types
+		{"text nullable", "text", true, "string"},
+		{"text not nullable", "text", false, "?string"},
+		{"varchar nullable", "varchar", true, "string"},
+		{"varchar(100) nullable", "varchar(100)", true, "string"},
+
+		// Boolean
+		{"boolean nullable", "boolean", true, "bool"},
+		{"boolean not nullable", "boolean", false, "?bool"},
+
+		// Float types
+		{"real nullable", "real", true, "float"},
+		{"double precision nullable", "double precision", true, "float"},
+		{"real not nullable", "real", false, "?float"},
+
+		// Date/Time types
+		{"timestamp nullable", "timestamp", true, "\\DateTime"},
+		{"date nullable", "date", true, "\\DateTime"},
+		{"timestamp not nullable", "timestamp", false, "?\\DateTime"},
+
+		// Binary
+		{"bytea nullable", "bytea", true, "string"},
+		{"bytea not nullable", "bytea", false, "?string"},
+
+		// JSON
+		{"json nullable", "json", true, "array"},
+		{"json not nullable", "json", false, "?array"},
+
+		// UUID
+		{"uuid nullable", "uuid", true, "string"},
+
+		// Unknown types
+		{"unknown type nullable", "unknowntype", true, "mixed"},
+		{"unknown type not nullable", "unknowntype", false, "mixed"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToPhp(tt.sqlType, tt.nullable)
+			if got != tt.want {
+				t.Errorf("SQLToPhp(%q, %v) = %q, want %q", tt.sqlType, tt.nullable, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSQLToRust(t *testing.T) {
+	tests := []struct {
+		name     string
+		sqlType  string
+		nullable bool
+		want     string
+	}{
+		// Integer types (nullable)
+		{"integer nullable", "integer", true, "i32"},
+		{"bigint nullable", "bigint", true, "i64"},
+		{"smallint nullable", "smallint", true, "i16"},
+
+		// Integer types (not nullable)
+		{"integer not nullable", "integer", false, "Option<i32>"},
+		{"bigint not nullable", "bigint", false, "Option<i64>"},
+		{"smallint not nullable", "smallint", false, "Option<i16>"},
+
+		// String types
+		{"text nullable", "text", true, "String"},
+		{"text not nullable", "text", false, "Option<String>"},
+		{"varchar nullable", "varchar", true, "String"},
+		{"varchar(100) nullable", "varchar(100)", true, "String"},
+
+		// Boolean
+		{"boolean nullable", "boolean", true, "bool"},
+		{"boolean not nullable", "boolean", false, "Option<bool>"},
+
+		// Float types
+		{"real nullable", "real", true, "f32"},
+		{"double precision nullable", "double precision", true, "f64"},
+		{"real not nullable", "real", false, "Option<f32>"},
+		{"double precision not nullable", "double precision", false, "Option<f64>"},
+
+		// Date/Time types
+		{"timestamp nullable", "timestamp", true, "NaiveDateTime"},
+		{"timestamptz nullable", "timestamptz", true, "DateTime<Utc>"},
+		{"date nullable", "date", true, "NaiveDate"},
+		{"time nullable", "time", true, "NaiveTime"},
+		{"timestamp not nullable", "timestamp", false, "Option<NaiveDateTime>"},
+
+		// Binary
+		{"bytea nullable", "bytea", true, "Vec<u8>"},
+		{"bytea not nullable", "bytea", false, "Option<Vec<u8>>"},
+
+		// JSON
+		{"json nullable", "json", true, "serde_json::Value"},
+		{"json not nullable", "json", false, "Option<serde_json::Value>"},
+
+		// UUID
+		{"uuid nullable", "uuid", true, "String"},
+
+		// Unknown types
+		{"unknown type nullable", "unknowntype", true, "String"},
+		{"unknown type not nullable", "unknowntype", false, "Option<String>"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SQLToRust(tt.sqlType, tt.nullable)
+			if got != tt.want {
+				t.Errorf("SQLToRust(%q, %v) = %q, want %q", tt.sqlType, tt.nullable, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestJavaTypeMap(t *testing.T) {
+	expectedMappings := map[string]string{
+		"integer":          "Integer",
+		"bigint":           "Long",
+		"smallint":         "Short",
+		"text":             "String",
+		"boolean":          "Boolean",
+		"double precision": "Double",
+		"numeric":          "BigDecimal",
+		"bytea":            "byte[]",
+		"timestamp":        "Timestamp",
+		"uuid":             "UUID",
+		"date":             "Date",
+	}
+
+	for sqlType, expectedJavaType := range expectedMappings {
+		if javaType, ok := JavaTypeMap[sqlType]; !ok {
+			t.Errorf("JavaTypeMap missing entry for %q", sqlType)
+		} else if javaType != expectedJavaType {
+			t.Errorf("JavaTypeMap[%q] = %q, want %q", sqlType, javaType, expectedJavaType)
+		}
+	}
+
+	if len(JavaTypeMap) == 0 {
+		t.Error("JavaTypeMap is empty")
+	}
+}
+
+func TestPHPTypeMap(t *testing.T) {
+	expectedMappings := map[string]string{
+		"integer":          "int",
+		"bigint":           "int",
+		"text":             "string",
+		"boolean":          "bool",
+		"double precision": "float",
+		"bytea":            "string",
+		"timestamp":        "\\DateTime",
+		"uuid":             "string",
+		"json":             "array",
+	}
+
+	for sqlType, expectedPHPType := range expectedMappings {
+		if phpType, ok := PHPTypeMap[sqlType]; !ok {
+			t.Errorf("PHPTypeMap missing entry for %q", sqlType)
+		} else if phpType != expectedPHPType {
+			t.Errorf("PHPTypeMap[%q] = %q, want %q", sqlType, phpType, expectedPHPType)
+		}
+	}
+
+	if len(PHPTypeMap) == 0 {
+		t.Error("PHPTypeMap is empty")
+	}
+}
+
+func TestRustTypeMap(t *testing.T) {
+	expectedMappings := map[string]string{
+		"integer":          "i32",
+		"bigint":           "i64",
+		"smallint":         "i16",
+		"text":             "String",
+		"boolean":          "bool",
+		"double precision": "f64",
+		"real":             "f32",
+		"bytea":            "Vec<u8>",
+		"timestamp":        "NaiveDateTime",
+		"timestamptz":      "DateTime<Utc>",
+		"date":             "NaiveDate",
+		"json":             "serde_json::Value",
+	}
+
+	for sqlType, expectedRustType := range expectedMappings {
+		if rustType, ok := RustTypeMap[sqlType]; !ok {
+			t.Errorf("RustTypeMap missing entry for %q", sqlType)
+		} else if rustType != expectedRustType {
+			t.Errorf("RustTypeMap[%q] = %q, want %q", sqlType, rustType, expectedRustType)
+		}
+	}
+
+	if len(RustTypeMap) == 0 {
+		t.Error("RustTypeMap is empty")
+	}
+}

pkg/commontypes/csharp.go

@@ -0,0 +1,74 @@
+package commontypes
+
+import "strings"
+
+// CSharpTypeMap maps PostgreSQL types to C# types
+var CSharpTypeMap = map[string]string{
+	// Integer types
+	"integer":     "int",
+	"int":         "int",
+	"int4":        "int",
+	"smallint":    "short",
+	"int2":        "short",
+	"bigint":      "long",
+	"int8":        "long",
+	"serial":      "int",
+	"bigserial":   "long",
+	"smallserial": "short",
+
+	// String types
+	"text":      "string",
+	"varchar":   "string",
+	"char":      "string",
+	"character": "string",
+	"citext":    "string",
+	"bpchar":    "string",
+	"uuid":      "Guid",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "float",
+	"float4":           "float",
+	"double precision": "double",
+	"float8":           "double",
+	"numeric":          "decimal",
+	"decimal":          "decimal",
+
+	// Date/Time types
+	"timestamp":                   "DateTime",
+	"timestamp without time zone": "DateTime",
+	"timestamp with time zone":    "DateTimeOffset",
+	"timestamptz":                 "DateTimeOffset",
+	"date":                        "DateTime",
+	"time":                        "TimeSpan",
+	"time without time zone":      "TimeSpan",
+	"time with time zone":         "DateTimeOffset",
+	"timetz":                      "DateTimeOffset",
+
+	// Binary
+	"bytea": "byte[]",
+
+	// JSON
+	"json":  "string",
+	"jsonb": "string",
+}
+
+// SQLToCSharp converts SQL types to C# types
+func SQLToCSharp(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	csType, ok := CSharpTypeMap[baseType]
+	if !ok {
+		csType = "object"
+	}
+
+	// Handle nullable value types (reference types are already nullable)
+	if !nullable && csType != "string" && !strings.HasSuffix(csType, "[]") && csType != "object" {
+		return csType + "?"
+	}
+
+	return csType
+}

pkg/commontypes/doc.go

@@ -0,0 +1,28 @@
+// Package commontypes provides shared type definitions used across multiple packages.
+//
+// # Overview
+//
+// The commontypes package contains common data structures, constants, and type
+// definitions that are shared between different parts of RelSpec but don't belong
+// to the core models package.
+//
+// # Purpose
+//
+// This package helps avoid circular dependencies by providing a common location
+// for types that are used by multiple packages without creating import cycles.
+//
+// # Contents
+//
+// Common types may include:
+//   - Shared enums and constants
+//   - Utility type aliases
+//   - Common error types
+//   - Shared configuration structures
+//
+// # Usage
+//
+//	import "git.warky.dev/wdevs/relspecgo/pkg/commontypes"
+//
+//	// Use common types
+//	var formatType commontypes.FormatType
+package commontypes

pkg/commontypes/golang.go

@@ -0,0 +1,89 @@
+package commontypes
+
+import "strings"
+
+// GoTypeMap maps PostgreSQL types to Go types
+var GoTypeMap = map[string]string{
+	// Integer types
+	"integer":     "int32",
+	"int":         "int32",
+	"int4":        "int32",
+	"smallint":    "int16",
+	"int2":        "int16",
+	"bigint":      "int64",
+	"int8":        "int64",
+	"serial":      "int32",
+	"bigserial":   "int64",
+	"smallserial": "int16",
+
+	// String types
+	"text":      "string",
+	"varchar":   "string",
+	"char":      "string",
+	"character": "string",
+	"citext":    "string",
+	"bpchar":    "string",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "float32",
+	"float4":           "float32",
+	"double precision": "float64",
+	"float8":           "float64",
+	"numeric":          "float64",
+	"decimal":          "float64",
+
+	// Date/Time types
+	"timestamp":                   "time.Time",
+	"timestamp without time zone": "time.Time",
+	"timestamp with time zone":    "time.Time",
+	"timestamptz":                 "time.Time",
+	"date":                        "time.Time",
+	"time":                        "time.Time",
+	"time without time zone":      "time.Time",
+	"time with time zone":         "time.Time",
+	"timetz":                      "time.Time",
+
+	// Binary
+	"bytea": "[]byte",
+
+	// UUID
+	"uuid": "string",
+
+	// JSON
+	"json":  "string",
+	"jsonb": "string",
+
+	// Array
+	"array": "[]string",
+}
+
+// SQLToGo converts SQL types to Go types
+func SQLToGo(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	goType, ok := GoTypeMap[baseType]
+	if !ok {
+		goType = "interface{}"
+	}
+
+	// Handle nullable types
+	if nullable {
+		return goType
+	}
+
+	// For nullable, use pointer types (except for slices and interfaces)
+	if !strings.HasPrefix(goType, "[]") && goType != "interface{}" {
+		return "*" + goType
+	}
+
+	return goType
+}
+
+// NeedsTimeImport checks if a Go type requires the time package
+func NeedsTimeImport(goType string) bool {
+	return strings.Contains(goType, "time.Time")
+}

pkg/commontypes/java.go

@@ -0,0 +1,68 @@
+package commontypes
+
+// JavaTypeMap maps PostgreSQL types to Java types
+var JavaTypeMap = map[string]string{
+	// Integer types
+	"integer":     "Integer",
+	"int":         "Integer",
+	"int4":        "Integer",
+	"smallint":    "Short",
+	"int2":        "Short",
+	"bigint":      "Long",
+	"int8":        "Long",
+	"serial":      "Integer",
+	"bigserial":   "Long",
+	"smallserial": "Short",
+
+	// String types
+	"text":      "String",
+	"varchar":   "String",
+	"char":      "String",
+	"character": "String",
+	"citext":    "String",
+	"bpchar":    "String",
+	"uuid":      "UUID",
+
+	// Boolean
+	"boolean": "Boolean",
+	"bool":    "Boolean",
+
+	// Float types
+	"real":             "Float",
+	"float4":           "Float",
+	"double precision": "Double",
+	"float8":           "Double",
+	"numeric":          "BigDecimal",
+	"decimal":          "BigDecimal",
+
+	// Date/Time types
+	"timestamp":                   "Timestamp",
+	"timestamp without time zone": "Timestamp",
+	"timestamp with time zone":    "Timestamp",
+	"timestamptz":                 "Timestamp",
+	"date":                        "Date",
+	"time":                        "Time",
+	"time without time zone":      "Time",
+	"time with time zone":         "Time",
+	"timetz":                      "Time",
+
+	// Binary
+	"bytea": "byte[]",
+
+	// JSON
+	"json":  "String",
+	"jsonb": "String",
+}
+
+// SQLToJava converts SQL types to Java types
+func SQLToJava(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	javaType, ok := JavaTypeMap[baseType]
+	if !ok {
+		javaType = "Object"
+	}
+
+	// Java uses wrapper classes for nullable types by default
+	return javaType
+}

pkg/commontypes/php.go

@@ -0,0 +1,72 @@
+package commontypes
+
+// PHPTypeMap maps PostgreSQL types to PHP types
+var PHPTypeMap = map[string]string{
+	// Integer types
+	"integer":     "int",
+	"int":         "int",
+	"int4":        "int",
+	"smallint":    "int",
+	"int2":        "int",
+	"bigint":      "int",
+	"int8":        "int",
+	"serial":      "int",
+	"bigserial":   "int",
+	"smallserial": "int",
+
+	// String types
+	"text":      "string",
+	"varchar":   "string",
+	"char":      "string",
+	"character": "string",
+	"citext":    "string",
+	"bpchar":    "string",
+	"uuid":      "string",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "float",
+	"float4":           "float",
+	"double precision": "float",
+	"float8":           "float",
+	"numeric":          "float",
+	"decimal":          "float",
+
+	// Date/Time types
+	"timestamp":                   "\\DateTime",
+	"timestamp without time zone": "\\DateTime",
+	"timestamp with time zone":    "\\DateTime",
+	"timestamptz":                 "\\DateTime",
+	"date":                        "\\DateTime",
+	"time":                        "\\DateTime",
+	"time without time zone":      "\\DateTime",
+	"time with time zone":         "\\DateTime",
+	"timetz":                      "\\DateTime",
+
+	// Binary
+	"bytea": "string",
+
+	// JSON
+	"json":  "array",
+	"jsonb": "array",
+}
+
+// SQLToPhp converts SQL types to PHP types
+func SQLToPhp(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	phpType, ok := PHPTypeMap[baseType]
+	if !ok {
+		phpType = "mixed"
+	}
+
+	// PHP 7.1+ supports nullable types with ?Type syntax
+	if !nullable && phpType != "mixed" {
+		return "?" + phpType
+	}
+
+	return phpType
+}

pkg/commontypes/python.go

@@ -0,0 +1,71 @@
+package commontypes
+
+// PythonTypeMap maps PostgreSQL types to Python types
+var PythonTypeMap = map[string]string{
+	// Integer types
+	"integer":     "int",
+	"int":         "int",
+	"int4":        "int",
+	"smallint":    "int",
+	"int2":        "int",
+	"bigint":      "int",
+	"int8":        "int",
+	"serial":      "int",
+	"bigserial":   "int",
+	"smallserial": "int",
+
+	// String types
+	"text":      "str",
+	"varchar":   "str",
+	"char":      "str",
+	"character": "str",
+	"citext":    "str",
+	"bpchar":    "str",
+	"uuid":      "UUID",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "float",
+	"float4":           "float",
+	"double precision": "float",
+	"float8":           "float",
+	"numeric":          "Decimal",
+	"decimal":          "Decimal",
+
+	// Date/Time types
+	"timestamp":                   "datetime",
+	"timestamp without time zone": "datetime",
+	"timestamp with time zone":    "datetime",
+	"timestamptz":                 "datetime",
+	"date":                        "date",
+	"time":                        "time",
+	"time without time zone":      "time",
+	"time with time zone":         "time",
+	"timetz":                      "time",
+
+	// Binary
+	"bytea": "bytes",
+
+	// JSON
+	"json":  "dict",
+	"jsonb": "dict",
+
+	// Array
+	"array": "list",
+}
+
+// SQLToPython converts SQL types to Python types
+func SQLToPython(sqlType string) string {
+	baseType := ExtractBaseType(sqlType)
+
+	pyType, ok := PythonTypeMap[baseType]
+	if !ok {
+		pyType = "Any"
+	}
+
+	// Python uses Optional[Type] for nullable, but we return the base type
+	return pyType
+}

pkg/commontypes/rust.go

@@ -0,0 +1,72 @@
+package commontypes
+
+// RustTypeMap maps PostgreSQL types to Rust types
+var RustTypeMap = map[string]string{
+	// Integer types
+	"integer":     "i32",
+	"int":         "i32",
+	"int4":        "i32",
+	"smallint":    "i16",
+	"int2":        "i16",
+	"bigint":      "i64",
+	"int8":        "i64",
+	"serial":      "i32",
+	"bigserial":   "i64",
+	"smallserial": "i16",
+
+	// String types
+	"text":      "String",
+	"varchar":   "String",
+	"char":      "String",
+	"character": "String",
+	"citext":    "String",
+	"bpchar":    "String",
+	"uuid":      "String",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "f32",
+	"float4":           "f32",
+	"double precision": "f64",
+	"float8":           "f64",
+	"numeric":          "f64",
+	"decimal":          "f64",
+
+	// Date/Time types (using chrono crate)
+	"timestamp":                   "NaiveDateTime",
+	"timestamp without time zone": "NaiveDateTime",
+	"timestamp with time zone":    "DateTime<Utc>",
+	"timestamptz":                 "DateTime<Utc>",
+	"date":                        "NaiveDate",
+	"time":                        "NaiveTime",
+	"time without time zone":      "NaiveTime",
+	"time with time zone":         "DateTime<Utc>",
+	"timetz":                      "DateTime<Utc>",
+
+	// Binary
+	"bytea": "Vec<u8>",
+
+	// JSON
+	"json":  "serde_json::Value",
+	"jsonb": "serde_json::Value",
+}
+
+// SQLToRust converts SQL types to Rust types
+func SQLToRust(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	rustType, ok := RustTypeMap[baseType]
+	if !ok {
+		rustType = "String"
+	}
+
+	// Handle nullable types with Option<T>
+	if nullable {
+		return rustType
+	}
+
+	return "Option<" + rustType + ">"
+}

pkg/commontypes/sql.go

@@ -0,0 +1,22 @@
+package commontypes
+
+import "strings"
+
+// ExtractBaseType extracts the base type from a SQL type string
+// Examples: varchar(100) → varchar, numeric(10,2) → numeric
+func ExtractBaseType(sqlType string) string {
+	sqlType = strings.ToLower(strings.TrimSpace(sqlType))
+
+	// Remove everything after '('
+	if idx := strings.Index(sqlType, "("); idx > 0 {
+		sqlType = sqlType[:idx]
+	}
+
+	return sqlType
+}
+
+// NormalizeType normalizes a SQL type to its base form
+// Alias for ExtractBaseType for backwards compatibility
+func NormalizeType(sqlType string) string {
+	return ExtractBaseType(sqlType)
+}

pkg/commontypes/typescript.go

@@ -0,0 +1,75 @@
+package commontypes
+
+// TypeScriptTypeMap maps PostgreSQL types to TypeScript types
+var TypeScriptTypeMap = map[string]string{
+	// Integer types
+	"integer":     "number",
+	"int":         "number",
+	"int4":        "number",
+	"smallint":    "number",
+	"int2":        "number",
+	"bigint":      "number",
+	"int8":        "number",
+	"serial":      "number",
+	"bigserial":   "number",
+	"smallserial": "number",
+
+	// String types
+	"text":      "string",
+	"varchar":   "string",
+	"char":      "string",
+	"character": "string",
+	"citext":    "string",
+	"bpchar":    "string",
+	"uuid":      "string",
+
+	// Boolean
+	"boolean": "boolean",
+	"bool":    "boolean",
+
+	// Float types
+	"real":             "number",
+	"float4":           "number",
+	"double precision": "number",
+	"float8":           "number",
+	"numeric":          "number",
+	"decimal":          "number",
+
+	// Date/Time types
+	"timestamp":                   "Date",
+	"timestamp without time zone": "Date",
+	"timestamp with time zone":    "Date",
+	"timestamptz":                 "Date",
+	"date":                        "Date",
+	"time":                        "Date",
+	"time without time zone":      "Date",
+	"time with time zone":         "Date",
+	"timetz":                      "Date",
+
+	// Binary
+	"bytea": "Buffer",
+
+	// JSON
+	"json":  "any",
+	"jsonb": "any",
+
+	// Array
+	"array": "any[]",
+}
+
+// SQLToTypeScript converts SQL types to TypeScript types
+func SQLToTypeScript(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	tsType, ok := TypeScriptTypeMap[baseType]
+	if !ok {
+		tsType = "any"
+	}
+
+	// Handle nullable types
+	if nullable {
+		return tsType
+	}
+
+	return tsType + " | null"
+}

pkg/diff/diff_test.go

@@ -0,0 +1,558 @@
+package diff
+
+import (
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+func TestCompareDatabases(t *testing.T) {
+	tests := []struct {
+		name   string
+		source *models.Database
+		target *models.Database
+		want   func(*DiffResult) bool
+	}{
+		{
+			name: "identical databases",
+			source: &models.Database{
+				Name:    "source",
+				Schemas: []*models.Schema{},
+			},
+			target: &models.Database{
+				Name:    "target",
+				Schemas: []*models.Schema{},
+			},
+			want: func(r *DiffResult) bool {
+				return r.Source == "source" && r.Target == "target" &&
+					len(r.Schemas.Missing) == 0 && len(r.Schemas.Extra) == 0
+			},
+		},
+		{
+			name: "different schemas",
+			source: &models.Database{
+				Name: "source",
+				Schemas: []*models.Schema{
+					{Name: "public"},
+				},
+			},
+			target: &models.Database{
+				Name:    "target",
+				Schemas: []*models.Schema{},
+			},
+			want: func(r *DiffResult) bool {
+				return len(r.Schemas.Missing) == 1 && r.Schemas.Missing[0].Name == "public"
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := CompareDatabases(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("CompareDatabases() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestCompareColumns(t *testing.T) {
+	tests := []struct {
+		name   string
+		source map[string]*models.Column
+		target map[string]*models.Column
+		want   func(*ColumnDiff) bool
+	}{
+		{
+			name:   "identical columns",
+			source: map[string]*models.Column{},
+			target: map[string]*models.Column{},
+			want: func(d *ColumnDiff) bool {
+				return len(d.Missing) == 0 && len(d.Extra) == 0 && len(d.Modified) == 0
+			},
+		},
+		{
+			name: "missing column",
+			source: map[string]*models.Column{
+				"id": {Name: "id", Type: "integer"},
+			},
+			target: map[string]*models.Column{},
+			want: func(d *ColumnDiff) bool {
+				return len(d.Missing) == 1 && d.Missing[0].Name == "id"
+			},
+		},
+		{
+			name:   "extra column",
+			source: map[string]*models.Column{},
+			target: map[string]*models.Column{
+				"id": {Name: "id", Type: "integer"},
+			},
+			want: func(d *ColumnDiff) bool {
+				return len(d.Extra) == 1 && d.Extra[0].Name == "id"
+			},
+		},
+		{
+			name: "modified column type",
+			source: map[string]*models.Column{
+				"id": {Name: "id", Type: "integer"},
+			},
+			target: map[string]*models.Column{
+				"id": {Name: "id", Type: "bigint"},
+			},
+			want: func(d *ColumnDiff) bool {
+				return len(d.Modified) == 1 && d.Modified[0].Name == "id" &&
+					d.Modified[0].Changes["type"] != nil
+			},
+		},
+		{
+			name: "modified column nullable",
+			source: map[string]*models.Column{
+				"name": {Name: "name", Type: "text", NotNull: true},
+			},
+			target: map[string]*models.Column{
+				"name": {Name: "name", Type: "text", NotNull: false},
+			},
+			want: func(d *ColumnDiff) bool {
+				return len(d.Modified) == 1 && d.Modified[0].Changes["not_null"] != nil
+			},
+		},
+		{
+			name: "modified column length",
+			source: map[string]*models.Column{
+				"name": {Name: "name", Type: "varchar", Length: 100},
+			},
+			target: map[string]*models.Column{
+				"name": {Name: "name", Type: "varchar", Length: 255},
+			},
+			want: func(d *ColumnDiff) bool {
+				return len(d.Modified) == 1 && d.Modified[0].Changes["length"] != nil
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareColumns(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("compareColumns() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestCompareColumnDetails(t *testing.T) {
+	tests := []struct {
+		name   string
+		source *models.Column
+		target *models.Column
+		want   int // number of changes
+	}{
+		{
+			name:   "identical columns",
+			source: &models.Column{Name: "id", Type: "integer"},
+			target: &models.Column{Name: "id", Type: "integer"},
+			want:   0,
+		},
+		{
+			name:   "type change",
+			source: &models.Column{Name: "id", Type: "integer"},
+			target: &models.Column{Name: "id", Type: "bigint"},
+			want:   1,
+		},
+		{
+			name:   "length change",
+			source: &models.Column{Name: "name", Type: "varchar", Length: 100},
+			target: &models.Column{Name: "name", Type: "varchar", Length: 255},
+			want:   1,
+		},
+		{
+			name:   "precision change",
+			source: &models.Column{Name: "price", Type: "numeric", Precision: 10},
+			target: &models.Column{Name: "price", Type: "numeric", Precision: 12},
+			want:   1,
+		},
+		{
+			name:   "scale change",
+			source: &models.Column{Name: "price", Type: "numeric", Scale: 2},
+			target: &models.Column{Name: "price", Type: "numeric", Scale: 4},
+			want:   1,
+		},
+		{
+			name:   "not null change",
+			source: &models.Column{Name: "name", Type: "text", NotNull: true},
+			target: &models.Column{Name: "name", Type: "text", NotNull: false},
+			want:   1,
+		},
+		{
+			name:   "auto increment change",
+			source: &models.Column{Name: "id", Type: "integer", AutoIncrement: true},
+			target: &models.Column{Name: "id", Type: "integer", AutoIncrement: false},
+			want:   1,
+		},
+		{
+			name:   "primary key change",
+			source: &models.Column{Name: "id", Type: "integer", IsPrimaryKey: true},
+			target: &models.Column{Name: "id", Type: "integer", IsPrimaryKey: false},
+			want:   1,
+		},
+		{
+			name:   "multiple changes",
+			source: &models.Column{Name: "id", Type: "integer", NotNull: true, AutoIncrement: true},
+			target: &models.Column{Name: "id", Type: "bigint", NotNull: false, AutoIncrement: false},
+			want:   3,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareColumnDetails(tt.source, tt.target)
+			if len(got) != tt.want {
+				t.Errorf("compareColumnDetails() = %d changes, want %d", len(got), tt.want)
+			}
+		})
+	}
+}
+
+func TestCompareIndexes(t *testing.T) {
+	tests := []struct {
+		name   string
+		source map[string]*models.Index
+		target map[string]*models.Index
+		want   func(*IndexDiff) bool
+	}{
+		{
+			name:   "identical indexes",
+			source: map[string]*models.Index{},
+			target: map[string]*models.Index{},
+			want: func(d *IndexDiff) bool {
+				return len(d.Missing) == 0 && len(d.Extra) == 0 && len(d.Modified) == 0
+			},
+		},
+		{
+			name: "missing index",
+			source: map[string]*models.Index{
+				"idx_name": {Name: "idx_name", Columns: []string{"name"}},
+			},
+			target: map[string]*models.Index{},
+			want: func(d *IndexDiff) bool {
+				return len(d.Missing) == 1 && d.Missing[0].Name == "idx_name"
+			},
+		},
+		{
+			name:   "extra index",
+			source: map[string]*models.Index{},
+			target: map[string]*models.Index{
+				"idx_name": {Name: "idx_name", Columns: []string{"name"}},
+			},
+			want: func(d *IndexDiff) bool {
+				return len(d.Extra) == 1 && d.Extra[0].Name == "idx_name"
+			},
+		},
+		{
+			name: "modified index uniqueness",
+			source: map[string]*models.Index{
+				"idx_name": {Name: "idx_name", Columns: []string{"name"}, Unique: false},
+			},
+			target: map[string]*models.Index{
+				"idx_name": {Name: "idx_name", Columns: []string{"name"}, Unique: true},
+			},
+			want: func(d *IndexDiff) bool {
+				return len(d.Modified) == 1 && d.Modified[0].Name == "idx_name"
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareIndexes(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("compareIndexes() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestCompareConstraints(t *testing.T) {
+	tests := []struct {
+		name   string
+		source map[string]*models.Constraint
+		target map[string]*models.Constraint
+		want   func(*ConstraintDiff) bool
+	}{
+		{
+			name:   "identical constraints",
+			source: map[string]*models.Constraint{},
+			target: map[string]*models.Constraint{},
+			want: func(d *ConstraintDiff) bool {
+				return len(d.Missing) == 0 && len(d.Extra) == 0 && len(d.Modified) == 0
+			},
+		},
+		{
+			name: "missing constraint",
+			source: map[string]*models.Constraint{
+				"pk_id": {Name: "pk_id", Type: "PRIMARY KEY", Columns: []string{"id"}},
+			},
+			target: map[string]*models.Constraint{},
+			want: func(d *ConstraintDiff) bool {
+				return len(d.Missing) == 1 && d.Missing[0].Name == "pk_id"
+			},
+		},
+		{
+			name:   "extra constraint",
+			source: map[string]*models.Constraint{},
+			target: map[string]*models.Constraint{
+				"pk_id": {Name: "pk_id", Type: "PRIMARY KEY", Columns: []string{"id"}},
+			},
+			want: func(d *ConstraintDiff) bool {
+				return len(d.Extra) == 1 && d.Extra[0].Name == "pk_id"
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareConstraints(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("compareConstraints() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestCompareRelationships(t *testing.T) {
+	tests := []struct {
+		name   string
+		source map[string]*models.Relationship
+		target map[string]*models.Relationship
+		want   func(*RelationshipDiff) bool
+	}{
+		{
+			name:   "identical relationships",
+			source: map[string]*models.Relationship{},
+			target: map[string]*models.Relationship{},
+			want: func(d *RelationshipDiff) bool {
+				return len(d.Missing) == 0 && len(d.Extra) == 0 && len(d.Modified) == 0
+			},
+		},
+		{
+			name: "missing relationship",
+			source: map[string]*models.Relationship{
+				"fk_user": {Name: "fk_user", Type: "FOREIGN KEY"},
+			},
+			target: map[string]*models.Relationship{},
+			want: func(d *RelationshipDiff) bool {
+				return len(d.Missing) == 1 && d.Missing[0].Name == "fk_user"
+			},
+		},
+		{
+			name:   "extra relationship",
+			source: map[string]*models.Relationship{},
+			target: map[string]*models.Relationship{
+				"fk_user": {Name: "fk_user", Type: "FOREIGN KEY"},
+			},
+			want: func(d *RelationshipDiff) bool {
+				return len(d.Extra) == 1 && d.Extra[0].Name == "fk_user"
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareRelationships(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("compareRelationships() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestCompareTables(t *testing.T) {
+	tests := []struct {
+		name   string
+		source []*models.Table
+		target []*models.Table
+		want   func(*TableDiff) bool
+	}{
+		{
+			name:   "identical tables",
+			source: []*models.Table{},
+			target: []*models.Table{},
+			want: func(d *TableDiff) bool {
+				return len(d.Missing) == 0 && len(d.Extra) == 0 && len(d.Modified) == 0
+			},
+		},
+		{
+			name: "missing table",
+			source: []*models.Table{
+				{Name: "users", Schema: "public"},
+			},
+			target: []*models.Table{},
+			want: func(d *TableDiff) bool {
+				return len(d.Missing) == 1 && d.Missing[0].Name == "users"
+			},
+		},
+		{
+			name:   "extra table",
+			source: []*models.Table{},
+			target: []*models.Table{
+				{Name: "users", Schema: "public"},
+			},
+			want: func(d *TableDiff) bool {
+				return len(d.Extra) == 1 && d.Extra[0].Name == "users"
+			},
+		},
+		{
+			name: "modified table",
+			source: []*models.Table{
+				{
+					Name:   "users",
+					Schema: "public",
+					Columns: map[string]*models.Column{
+						"id": {Name: "id", Type: "integer"},
+					},
+				},
+			},
+			target: []*models.Table{
+				{
+					Name:   "users",
+					Schema: "public",
+					Columns: map[string]*models.Column{
+						"id": {Name: "id", Type: "bigint"},
+					},
+				},
+			},
+			want: func(d *TableDiff) bool {
+				return len(d.Modified) == 1 && d.Modified[0].Name == "users"
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareTables(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("compareTables() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestCompareSchemas(t *testing.T) {
+	tests := []struct {
+		name   string
+		source []*models.Schema
+		target []*models.Schema
+		want   func(*SchemaDiff) bool
+	}{
+		{
+			name:   "identical schemas",
+			source: []*models.Schema{},
+			target: []*models.Schema{},
+			want: func(d *SchemaDiff) bool {
+				return len(d.Missing) == 0 && len(d.Extra) == 0 && len(d.Modified) == 0
+			},
+		},
+		{
+			name: "missing schema",
+			source: []*models.Schema{
+				{Name: "public"},
+			},
+			target: []*models.Schema{},
+			want: func(d *SchemaDiff) bool {
+				return len(d.Missing) == 1 && d.Missing[0].Name == "public"
+			},
+		},
+		{
+			name:   "extra schema",
+			source: []*models.Schema{},
+			target: []*models.Schema{
+				{Name: "public"},
+			},
+			want: func(d *SchemaDiff) bool {
+				return len(d.Extra) == 1 && d.Extra[0].Name == "public"
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := compareSchemas(tt.source, tt.target)
+			if !tt.want(got) {
+				t.Errorf("compareSchemas() result doesn't match expectations")
+			}
+		})
+	}
+}
+
+func TestIsEmpty(t *testing.T) {
+	tests := []struct {
+		name string
+		v    interface{}
+		want bool
+	}{
+		{"empty ColumnDiff", &ColumnDiff{Missing: []*models.Column{}, Extra: []*models.Column{}, Modified: []*ColumnChange{}}, true},
+		{"ColumnDiff with missing", &ColumnDiff{Missing: []*models.Column{{Name: "id"}}, Extra: []*models.Column{}, Modified: []*ColumnChange{}}, false},
+		{"ColumnDiff with extra", &ColumnDiff{Missing: []*models.Column{}, Extra: []*models.Column{{Name: "id"}}, Modified: []*ColumnChange{}}, false},
+		{"empty IndexDiff", &IndexDiff{Missing: []*models.Index{}, Extra: []*models.Index{}, Modified: []*IndexChange{}}, true},
+		{"IndexDiff with missing", &IndexDiff{Missing: []*models.Index{{Name: "idx"}}, Extra: []*models.Index{}, Modified: []*IndexChange{}}, false},
+		{"empty TableDiff", &TableDiff{Missing: []*models.Table{}, Extra: []*models.Table{}, Modified: []*TableChange{}}, true},
+		{"TableDiff with extra", &TableDiff{Missing: []*models.Table{}, Extra: []*models.Table{{Name: "users"}}, Modified: []*TableChange{}}, false},
+		{"empty ConstraintDiff", &ConstraintDiff{Missing: []*models.Constraint{}, Extra: []*models.Constraint{}, Modified: []*ConstraintChange{}}, true},
+		{"empty RelationshipDiff", &RelationshipDiff{Missing: []*models.Relationship{}, Extra: []*models.Relationship{}, Modified: []*RelationshipChange{}}, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := isEmpty(tt.v)
+			if got != tt.want {
+				t.Errorf("isEmpty() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestComputeSummary(t *testing.T) {
+	tests := []struct {
+		name   string
+		result *DiffResult
+		want   func(*Summary) bool
+	}{
+		{
+			name: "empty diff",
+			result: &DiffResult{
+				Schemas: &SchemaDiff{
+					Missing:  []*models.Schema{},
+					Extra:    []*models.Schema{},
+					Modified: []*SchemaChange{},
+				},
+			},
+			want: func(s *Summary) bool {
+				return s.Schemas.Missing == 0 && s.Schemas.Extra == 0 && s.Schemas.Modified == 0
+			},
+		},
+		{
+			name: "schemas with differences",
+			result: &DiffResult{
+				Schemas: &SchemaDiff{
+					Missing: []*models.Schema{{Name: "schema1"}},
+					Extra:   []*models.Schema{{Name: "schema2"}, {Name: "schema3"}},
+					Modified: []*SchemaChange{
+						{Name: "public"},
+					},
+				},
+			},
+			want: func(s *Summary) bool {
+				return s.Schemas.Missing == 1 && s.Schemas.Extra == 2 && s.Schemas.Modified == 1
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := ComputeSummary(tt.result)
+			if !tt.want(got) {
+				t.Errorf("ComputeSummary() result doesn't match expectations")
+			}
+		})
+	}
+}

pkg/diff/doc.go

@@ -0,0 +1,43 @@
+// Package diff provides utilities for comparing database schemas and identifying differences.
+//
+// # Overview
+//
+// The diff package compares two database models at various granularity levels (database,
+// schema, table, column) and produces detailed reports of differences including:
+//   - Missing items (present in source but not in target)
+//   - Extra items (present in target but not in source)
+//   - Modified items (present in both but with different properties)
+//
+// # Usage
+//
+// Compare two databases and format the output:
+//
+//	result := diff.CompareDatabases(sourceDB, targetDB)
+//	err := diff.FormatDiff(result, diff.OutputFormatText, os.Stdout)
+//
+// # Output Formats
+//
+// The package supports multiple output formats:
+//   - OutputFormatText: Human-readable text format
+//   - OutputFormatJSON: Structured JSON output
+//   - OutputFormatYAML: Structured YAML output
+//
+// # Comparison Scope
+//
+// The comparison covers:
+//   - Schemas: Name, description, and contents
+//   - Tables: Name, description, and all sub-elements
+//   - Columns: Type, nullability, defaults, constraints
+//   - Indexes: Columns, uniqueness, type
+//   - Constraints: Type, columns, references
+//   - Relationships: Type, from/to tables and columns
+//   - Views: Definition and columns
+//   - Sequences: Start value, increment, min/max values
+//
+// # Use Cases
+//
+//   - Schema migration planning
+//   - Database synchronization verification
+//   - Change tracking and auditing
+//   - CI/CD pipeline validation
+package diff

pkg/diff/formatters_test.go

@@ -0,0 +1,440 @@
+package diff
+
+import (
+	"bytes"
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+func TestFormatDiff(t *testing.T) {
+	result := &DiffResult{
+		Source: "source_db",
+		Target: "target_db",
+		Schemas: &SchemaDiff{
+			Missing:  []*models.Schema{},
+			Extra:    []*models.Schema{},
+			Modified: []*SchemaChange{},
+		},
+	}
+
+	tests := []struct {
+		name    string
+		format  OutputFormat
+		wantErr bool
+	}{
+		{"summary format", FormatSummary, false},
+		{"json format", FormatJSON, false},
+		{"html format", FormatHTML, false},
+		{"invalid format", OutputFormat("invalid"), true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			err := FormatDiff(result, tt.format, &buf)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("FormatDiff() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			if !tt.wantErr && buf.Len() == 0 {
+				t.Error("FormatDiff() produced empty output")
+			}
+		})
+	}
+}
+
+func TestFormatSummary(t *testing.T) {
+	tests := []struct {
+		name    string
+		result  *DiffResult
+		wantStr []string // strings that should appear in output
+	}{
+		{
+			name: "no differences",
+			result: &DiffResult{
+				Source: "source",
+				Target: "target",
+				Schemas: &SchemaDiff{
+					Missing:  []*models.Schema{},
+					Extra:    []*models.Schema{},
+					Modified: []*SchemaChange{},
+				},
+			},
+			wantStr: []string{"source", "target", "No differences found"},
+		},
+		{
+			name: "with schema differences",
+			result: &DiffResult{
+				Source: "source",
+				Target: "target",
+				Schemas: &SchemaDiff{
+					Missing: []*models.Schema{{Name: "schema1"}},
+					Extra:   []*models.Schema{{Name: "schema2"}},
+					Modified: []*SchemaChange{
+						{Name: "public"},
+					},
+				},
+			},
+			wantStr: []string{"Schemas:", "Missing:  1", "Extra:    1", "Modified: 1"},
+		},
+		{
+			name: "with table differences",
+			result: &DiffResult{
+				Source: "source",
+				Target: "target",
+				Schemas: &SchemaDiff{
+					Modified: []*SchemaChange{
+						{
+							Name: "public",
+							Tables: &TableDiff{
+								Missing: []*models.Table{{Name: "users"}},
+								Extra:   []*models.Table{{Name: "posts"}},
+								Modified: []*TableChange{
+									{Name: "comments", Schema: "public"},
+								},
+							},
+						},
+					},
+				},
+			},
+			wantStr: []string{"Tables:", "Missing:  1", "Extra:    1", "Modified: 1"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			err := formatSummary(tt.result, &buf)
+
+			if err != nil {
+				t.Errorf("formatSummary() error = %v", err)
+				return
+			}
+
+			output := buf.String()
+			for _, want := range tt.wantStr {
+				if !strings.Contains(output, want) {
+					t.Errorf("formatSummary() output doesn't contain %q\nGot: %s", want, output)
+				}
+			}
+		})
+	}
+}
+
+func TestFormatJSON(t *testing.T) {
+	result := &DiffResult{
+		Source: "source",
+		Target: "target",
+		Schemas: &SchemaDiff{
+			Missing:  []*models.Schema{{Name: "schema1"}},
+			Extra:    []*models.Schema{},
+			Modified: []*SchemaChange{},
+		},
+	}
+
+	var buf bytes.Buffer
+	err := formatJSON(result, &buf)
+
+	if err != nil {
+		t.Errorf("formatJSON() error = %v", err)
+		return
+	}
+
+	// Check if output is valid JSON
+	var decoded DiffResult
+	if err := json.Unmarshal(buf.Bytes(), &decoded); err != nil {
+		t.Errorf("formatJSON() produced invalid JSON: %v", err)
+	}
+
+	// Check basic structure
+	if decoded.Source != "source" {
+		t.Errorf("formatJSON() source = %v, want %v", decoded.Source, "source")
+	}
+	if decoded.Target != "target" {
+		t.Errorf("formatJSON() target = %v, want %v", decoded.Target, "target")
+	}
+	if len(decoded.Schemas.Missing) != 1 {
+		t.Errorf("formatJSON() missing schemas = %v, want 1", len(decoded.Schemas.Missing))
+	}
+}
+
+func TestFormatHTML(t *testing.T) {
+	tests := []struct {
+		name    string
+		result  *DiffResult
+		wantStr []string // HTML elements/content that should appear
+	}{
+		{
+			name: "basic HTML structure",
+			result: &DiffResult{
+				Source: "source",
+				Target: "target",
+				Schemas: &SchemaDiff{
+					Missing:  []*models.Schema{},
+					Extra:    []*models.Schema{},
+					Modified: []*SchemaChange{},
+				},
+			},
+			wantStr: []string{
+				"<!DOCTYPE html>",
+				"<title>Database Diff Report</title>",
+				"source",
+				"target",
+			},
+		},
+		{
+			name: "with schema differences",
+			result: &DiffResult{
+				Source: "source",
+				Target: "target",
+				Schemas: &SchemaDiff{
+					Missing:  []*models.Schema{{Name: "missing_schema"}},
+					Extra:    []*models.Schema{{Name: "extra_schema"}},
+					Modified: []*SchemaChange{},
+				},
+			},
+			wantStr: []string{
+				"<!DOCTYPE html>",
+				"missing_schema",
+				"extra_schema",
+				"MISSING",
+				"EXTRA",
+			},
+		},
+		{
+			name: "with table modifications",
+			result: &DiffResult{
+				Source: "source",
+				Target: "target",
+				Schemas: &SchemaDiff{
+					Modified: []*SchemaChange{
+						{
+							Name: "public",
+							Tables: &TableDiff{
+								Modified: []*TableChange{
+									{
+										Name:   "users",
+										Schema: "public",
+										Columns: &ColumnDiff{
+											Missing: []*models.Column{{Name: "email", Type: "text"}},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+			wantStr: []string{
+				"public",
+				"users",
+				"email",
+				"text",
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			err := formatHTML(tt.result, &buf)
+
+			if err != nil {
+				t.Errorf("formatHTML() error = %v", err)
+				return
+			}
+
+			output := buf.String()
+			for _, want := range tt.wantStr {
+				if !strings.Contains(output, want) {
+					t.Errorf("formatHTML() output doesn't contain %q", want)
+				}
+			}
+		})
+	}
+}
+
+func TestFormatSummaryWithColumns(t *testing.T) {
+	result := &DiffResult{
+		Source: "source",
+		Target: "target",
+		Schemas: &SchemaDiff{
+			Modified: []*SchemaChange{
+				{
+					Name: "public",
+					Tables: &TableDiff{
+						Modified: []*TableChange{
+							{
+								Name:   "users",
+								Schema: "public",
+								Columns: &ColumnDiff{
+									Missing: []*models.Column{{Name: "email"}},
+									Extra:   []*models.Column{{Name: "phone"}, {Name: "address"}},
+									Modified: []*ColumnChange{
+										{Name: "name"},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	err := formatSummary(result, &buf)
+
+	if err != nil {
+		t.Errorf("formatSummary() error = %v", err)
+		return
+	}
+
+	output := buf.String()
+	wantStrings := []string{
+		"Columns:",
+		"Missing:  1",
+		"Extra:    2",
+		"Modified: 1",
+	}
+
+	for _, want := range wantStrings {
+		if !strings.Contains(output, want) {
+			t.Errorf("formatSummary() output doesn't contain %q\nGot: %s", want, output)
+		}
+	}
+}
+
+func TestFormatSummaryWithIndexes(t *testing.T) {
+	result := &DiffResult{
+		Source: "source",
+		Target: "target",
+		Schemas: &SchemaDiff{
+			Modified: []*SchemaChange{
+				{
+					Name: "public",
+					Tables: &TableDiff{
+						Modified: []*TableChange{
+							{
+								Name:   "users",
+								Schema: "public",
+								Indexes: &IndexDiff{
+									Missing:  []*models.Index{{Name: "idx_email"}},
+									Extra:    []*models.Index{{Name: "idx_phone"}},
+									Modified: []*IndexChange{{Name: "idx_name"}},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	err := formatSummary(result, &buf)
+
+	if err != nil {
+		t.Errorf("formatSummary() error = %v", err)
+		return
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "Indexes:") {
+		t.Error("formatSummary() output doesn't contain Indexes section")
+	}
+	if !strings.Contains(output, "Missing:  1") {
+		t.Error("formatSummary() output doesn't contain correct missing count")
+	}
+}
+
+func TestFormatSummaryWithConstraints(t *testing.T) {
+	result := &DiffResult{
+		Source: "source",
+		Target: "target",
+		Schemas: &SchemaDiff{
+			Modified: []*SchemaChange{
+				{
+					Name: "public",
+					Tables: &TableDiff{
+						Modified: []*TableChange{
+							{
+								Name:   "users",
+								Schema: "public",
+								Constraints: &ConstraintDiff{
+									Missing: []*models.Constraint{{Name: "pk_users", Type: "PRIMARY KEY"}},
+									Extra:   []*models.Constraint{{Name: "fk_users_roles", Type: "FOREIGN KEY"}},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	err := formatSummary(result, &buf)
+
+	if err != nil {
+		t.Errorf("formatSummary() error = %v", err)
+		return
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "Constraints:") {
+		t.Error("formatSummary() output doesn't contain Constraints section")
+	}
+}
+
+func TestFormatJSONIndentation(t *testing.T) {
+	result := &DiffResult{
+		Source: "source",
+		Target: "target",
+		Schemas: &SchemaDiff{
+			Missing: []*models.Schema{{Name: "test"}},
+		},
+	}
+
+	var buf bytes.Buffer
+	err := formatJSON(result, &buf)
+
+	if err != nil {
+		t.Errorf("formatJSON() error = %v", err)
+		return
+	}
+
+	// Check that JSON is indented (has newlines and spaces)
+	output := buf.String()
+	if !strings.Contains(output, "\n") {
+		t.Error("formatJSON() should produce indented JSON with newlines")
+	}
+	if !strings.Contains(output, "  ") {
+		t.Error("formatJSON() should produce indented JSON with spaces")
+	}
+}
+
+func TestOutputFormatConstants(t *testing.T) {
+	tests := []struct {
+		name   string
+		format OutputFormat
+		want   string
+	}{
+		{"summary constant", FormatSummary, "summary"},
+		{"json constant", FormatJSON, "json"},
+		{"html constant", FormatHTML, "html"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if string(tt.format) != tt.want {
+				t.Errorf("OutputFormat %v = %v, want %v", tt.name, tt.format, tt.want)
+			}
+		})
+	}
+}

pkg/inspector/doc.go

@@ -0,0 +1,40 @@
+// Package inspector provides database introspection capabilities for live databases.
+//
+// # Overview
+//
+// The inspector package contains utilities for connecting to live databases and
+// extracting their schema information through system catalog queries and metadata
+// inspection.
+//
+// # Features
+//
+//   - Database connection management
+//   - Schema metadata extraction
+//   - Table structure analysis
+//   - Constraint and index discovery
+//   - Foreign key relationship mapping
+//
+// # Supported Databases
+//
+//   - PostgreSQL (via pgx driver)
+//   - SQLite (via modernc.org/sqlite driver)
+//
+// # Usage
+//
+// This package is used internally by database readers (pgsql, sqlite) to perform
+// live schema introspection:
+//
+//	inspector := inspector.NewPostgreSQLInspector(connString)
+//	schemas, err := inspector.GetSchemas()
+//	tables, err := inspector.GetTables(schemaName)
+//
+// # Architecture
+//
+// Each database type has its own inspector implementation that understands the
+// specific system catalogs and metadata structures of that database system.
+//
+// # Security
+//
+// Inspectors use read-only operations and never modify database structure.
+// Connection credentials should be handled securely.
+package inspector

pkg/inspector/inspector_test.go

@@ -0,0 +1,238 @@
+package inspector
+
+import (
+	"testing"
+)
+
+func TestNewInspector(t *testing.T) {
+	db := createTestDatabase()
+	config := GetDefaultConfig()
+
+	inspector := NewInspector(db, config)
+
+	if inspector == nil {
+		t.Fatal("NewInspector() returned nil")
+	}
+
+	if inspector.db != db {
+		t.Error("NewInspector() database not set correctly")
+	}
+
+	if inspector.config != config {
+		t.Error("NewInspector() config not set correctly")
+	}
+}
+
+func TestInspect(t *testing.T) {
+	db := createTestDatabase()
+	config := GetDefaultConfig()
+
+	inspector := NewInspector(db, config)
+	report, err := inspector.Inspect()
+
+	if err != nil {
+		t.Fatalf("Inspect() returned error: %v", err)
+	}
+
+	if report == nil {
+		t.Fatal("Inspect() returned nil report")
+	}
+
+	if report.Database != db.Name {
+		t.Errorf("Inspect() report.Database = %q, want %q", report.Database, db.Name)
+	}
+
+	if report.Summary.TotalRules != len(config.Rules) {
+		t.Errorf("Inspect() TotalRules = %d, want %d", report.Summary.TotalRules, len(config.Rules))
+	}
+
+	if len(report.Violations) == 0 {
+		t.Error("Inspect() returned no violations, expected some results")
+	}
+}
+
+func TestInspectWithDisabledRules(t *testing.T) {
+	db := createTestDatabase()
+	config := GetDefaultConfig()
+
+	// Disable all rules
+	for name := range config.Rules {
+		rule := config.Rules[name]
+		rule.Enabled = "off"
+		config.Rules[name] = rule
+	}
+
+	inspector := NewInspector(db, config)
+	report, err := inspector.Inspect()
+
+	if err != nil {
+		t.Fatalf("Inspect() with disabled rules returned error: %v", err)
+	}
+
+	if report.Summary.RulesChecked != 0 {
+		t.Errorf("Inspect() RulesChecked = %d, want 0 (all disabled)", report.Summary.RulesChecked)
+	}
+
+	if report.Summary.RulesSkipped != len(config.Rules) {
+		t.Errorf("Inspect() RulesSkipped = %d, want %d", report.Summary.RulesSkipped, len(config.Rules))
+	}
+}
+
+func TestInspectWithEnforcedRules(t *testing.T) {
+	db := createTestDatabase()
+	config := GetDefaultConfig()
+
+	// Enable only one rule and enforce it
+	for name := range config.Rules {
+		rule := config.Rules[name]
+		rule.Enabled = "off"
+		config.Rules[name] = rule
+	}
+
+	primaryKeyRule := config.Rules["primary_key_naming"]
+	primaryKeyRule.Enabled = "enforce"
+	primaryKeyRule.Pattern = "^id$"
+	config.Rules["primary_key_naming"] = primaryKeyRule
+
+	inspector := NewInspector(db, config)
+	report, err := inspector.Inspect()
+
+	if err != nil {
+		t.Fatalf("Inspect() returned error: %v", err)
+	}
+
+	if report.Summary.RulesChecked != 1 {
+		t.Errorf("Inspect() RulesChecked = %d, want 1", report.Summary.RulesChecked)
+	}
+
+	// All results should be at error level for enforced rules
+	for _, violation := range report.Violations {
+		if violation.Level != "error" {
+			t.Errorf("Enforced rule violation has Level = %q, want \"error\"", violation.Level)
+		}
+	}
+}
+
+func TestGenerateSummary(t *testing.T) {
+	db := createTestDatabase()
+	config := GetDefaultConfig()
+	inspector := NewInspector(db, config)
+
+	results := []ValidationResult{
+		{RuleName: "rule1", Passed: true, Level: "error"},
+		{RuleName: "rule2", Passed: false, Level: "error"},
+		{RuleName: "rule3", Passed: false, Level: "warning"},
+		{RuleName: "rule4", Passed: true, Level: "warning"},
+	}
+
+	summary := inspector.generateSummary(results)
+
+	if summary.PassedCount != 2 {
+		t.Errorf("generateSummary() PassedCount = %d, want 2", summary.PassedCount)
+	}
+
+	if summary.ErrorCount != 1 {
+		t.Errorf("generateSummary() ErrorCount = %d, want 1", summary.ErrorCount)
+	}
+
+	if summary.WarningCount != 1 {
+		t.Errorf("generateSummary() WarningCount = %d, want 1", summary.WarningCount)
+	}
+}
+
+func TestHasErrors(t *testing.T) {
+	tests := []struct {
+		name   string
+		report *InspectorReport
+		want   bool
+	}{
+		{
+			name: "with errors",
+			report: &InspectorReport{
+				Summary: ReportSummary{
+					ErrorCount: 5,
+				},
+			},
+			want: true,
+		},
+		{
+			name: "without errors",
+			report: &InspectorReport{
+				Summary: ReportSummary{
+					ErrorCount:   0,
+					WarningCount: 3,
+				},
+			},
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.report.HasErrors(); got != tt.want {
+				t.Errorf("HasErrors() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGetValidator(t *testing.T) {
+	tests := []struct {
+		name         string
+		functionName string
+		wantExists   bool
+	}{
+		{"primary_key_naming", "primary_key_naming", true},
+		{"primary_key_datatype", "primary_key_datatype", true},
+		{"foreign_key_column_naming", "foreign_key_column_naming", true},
+		{"table_regexpr", "table_regexpr", true},
+		{"column_regexpr", "column_regexpr", true},
+		{"reserved_words", "reserved_words", true},
+		{"have_primary_key", "have_primary_key", true},
+		{"orphaned_foreign_key", "orphaned_foreign_key", true},
+		{"circular_dependency", "circular_dependency", true},
+		{"unknown_function", "unknown_function", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, exists := getValidator(tt.functionName)
+			if exists != tt.wantExists {
+				t.Errorf("getValidator(%q) exists = %v, want %v", tt.functionName, exists, tt.wantExists)
+			}
+		})
+	}
+}
+
+func TestCreateResult(t *testing.T) {
+	result := createResult(
+		"test_rule",
+		true,
+		"Test message",
+		"schema.table.column",
+		map[string]interface{}{
+			"key1": "value1",
+			"key2": 42,
+		},
+	)
+
+	if result.RuleName != "test_rule" {
+		t.Errorf("createResult() RuleName = %q, want \"test_rule\"", result.RuleName)
+	}
+
+	if !result.Passed {
+		t.Error("createResult() Passed = false, want true")
+	}
+
+	if result.Message != "Test message" {
+		t.Errorf("createResult() Message = %q, want \"Test message\"", result.Message)
+	}
+
+	if result.Location != "schema.table.column" {
+		t.Errorf("createResult() Location = %q, want \"schema.table.column\"", result.Location)
+	}
+
+	if len(result.Context) != 2 {
+		t.Errorf("createResult() Context length = %d, want 2", len(result.Context))
+	}
+}

pkg/inspector/report_test.go

@@ -0,0 +1,366 @@
+package inspector
+
+import (
+	"bytes"
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+)
+
+func createTestReport() *InspectorReport {
+	return &InspectorReport{
+		Summary: ReportSummary{
+			TotalRules:   10,
+			RulesChecked: 8,
+			RulesSkipped: 2,
+			ErrorCount:   3,
+			WarningCount: 5,
+			PassedCount:  12,
+		},
+		Violations: []ValidationResult{
+			{
+				RuleName: "primary_key_naming",
+				Level:    "error",
+				Message:  "Primary key should start with 'id_'",
+				Location: "public.users.user_id",
+				Passed:   false,
+				Context: map[string]interface{}{
+					"schema":  "public",
+					"table":   "users",
+					"column":  "user_id",
+					"pattern": "^id_",
+				},
+			},
+			{
+				RuleName: "table_name_length",
+				Level:    "warning",
+				Message:  "Table name too long",
+				Location: "public.very_long_table_name_that_exceeds_limits",
+				Passed:   false,
+				Context: map[string]interface{}{
+					"schema":     "public",
+					"table":      "very_long_table_name_that_exceeds_limits",
+					"length":     44,
+					"max_length": 32,
+				},
+			},
+		},
+		GeneratedAt:  time.Now(),
+		Database:     "testdb",
+		SourceFormat: "postgresql",
+	}
+}
+
+func TestNewMarkdownFormatter(t *testing.T) {
+	var buf bytes.Buffer
+	formatter := NewMarkdownFormatter(&buf)
+
+	if formatter == nil {
+		t.Fatal("NewMarkdownFormatter() returned nil")
+	}
+
+	// Buffer is not a terminal, so colors should be disabled
+	if formatter.UseColors {
+		t.Error("NewMarkdownFormatter() UseColors should be false for non-terminal")
+	}
+}
+
+func TestNewJSONFormatter(t *testing.T) {
+	formatter := NewJSONFormatter()
+
+	if formatter == nil {
+		t.Fatal("NewJSONFormatter() returned nil")
+	}
+}
+
+func TestMarkdownFormatter_Format(t *testing.T) {
+	report := createTestReport()
+	var buf bytes.Buffer
+	formatter := NewMarkdownFormatter(&buf)
+
+	output, err := formatter.Format(report)
+	if err != nil {
+		t.Fatalf("MarkdownFormatter.Format() returned error: %v", err)
+	}
+
+	// Check that output contains expected sections
+	if !strings.Contains(output, "# RelSpec Inspector Report") {
+		t.Error("Markdown output missing header")
+	}
+
+	if !strings.Contains(output, "Database:") {
+		t.Error("Markdown output missing database field")
+	}
+
+	if !strings.Contains(output, "testdb") {
+		t.Error("Markdown output missing database name")
+	}
+
+	if !strings.Contains(output, "Summary") {
+		t.Error("Markdown output missing summary section")
+	}
+
+	if !strings.Contains(output, "Rules Checked: 8") {
+		t.Error("Markdown output missing rules checked count")
+	}
+
+	if !strings.Contains(output, "Errors: 3") {
+		t.Error("Markdown output missing error count")
+	}
+
+	if !strings.Contains(output, "Warnings: 5") {
+		t.Error("Markdown output missing warning count")
+	}
+
+	if !strings.Contains(output, "Violations") {
+		t.Error("Markdown output missing violations section")
+	}
+
+	if !strings.Contains(output, "primary_key_naming") {
+		t.Error("Markdown output missing rule name")
+	}
+
+	if !strings.Contains(output, "public.users.user_id") {
+		t.Error("Markdown output missing location")
+	}
+}
+
+func TestMarkdownFormatter_FormatNoViolations(t *testing.T) {
+	report := &InspectorReport{
+		Summary: ReportSummary{
+			TotalRules:   10,
+			RulesChecked: 10,
+			RulesSkipped: 0,
+			ErrorCount:   0,
+			WarningCount: 0,
+			PassedCount:  50,
+		},
+		Violations:   []ValidationResult{},
+		GeneratedAt:  time.Now(),
+		Database:     "testdb",
+		SourceFormat: "postgresql",
+	}
+
+	var buf bytes.Buffer
+	formatter := NewMarkdownFormatter(&buf)
+
+	output, err := formatter.Format(report)
+	if err != nil {
+		t.Fatalf("MarkdownFormatter.Format() returned error: %v", err)
+	}
+
+	if !strings.Contains(output, "No violations found") {
+		t.Error("Markdown output should indicate no violations")
+	}
+}
+
+func TestJSONFormatter_Format(t *testing.T) {
+	report := createTestReport()
+	formatter := NewJSONFormatter()
+
+	output, err := formatter.Format(report)
+	if err != nil {
+		t.Fatalf("JSONFormatter.Format() returned error: %v", err)
+	}
+
+	// Verify it's valid JSON
+	var decoded InspectorReport
+	if err := json.Unmarshal([]byte(output), &decoded); err != nil {
+		t.Fatalf("JSONFormatter.Format() produced invalid JSON: %v", err)
+	}
+
+	// Check key fields
+	if decoded.Database != "testdb" {
+		t.Errorf("JSON decoded Database = %q, want \"testdb\"", decoded.Database)
+	}
+
+	if decoded.Summary.ErrorCount != 3 {
+		t.Errorf("JSON decoded ErrorCount = %d, want 3", decoded.Summary.ErrorCount)
+	}
+
+	if len(decoded.Violations) != 2 {
+		t.Errorf("JSON decoded Violations length = %d, want 2", len(decoded.Violations))
+	}
+}
+
+func TestMarkdownFormatter_FormatHeader(t *testing.T) {
+	var buf bytes.Buffer
+	formatter := NewMarkdownFormatter(&buf)
+
+	header := formatter.formatHeader("Test Header")
+
+	if !strings.Contains(header, "# Test Header") {
+		t.Errorf("formatHeader() = %q, want to contain \"# Test Header\"", header)
+	}
+}
+
+func TestMarkdownFormatter_FormatBold(t *testing.T) {
+	tests := []struct {
+		name         string
+		useColors    bool
+		text         string
+		wantContains string
+	}{
+		{
+			name:         "without colors",
+			useColors:    false,
+			text:         "Bold Text",
+			wantContains: "**Bold Text**",
+		},
+		{
+			name:         "with colors",
+			useColors:    true,
+			text:         "Bold Text",
+			wantContains: "Bold Text",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			formatter := &MarkdownFormatter{UseColors: tt.useColors}
+			result := formatter.formatBold(tt.text)
+
+			if !strings.Contains(result, tt.wantContains) {
+				t.Errorf("formatBold() = %q, want to contain %q", result, tt.wantContains)
+			}
+		})
+	}
+}
+
+func TestMarkdownFormatter_Colorize(t *testing.T) {
+	tests := []struct {
+		name      string
+		useColors bool
+		text      string
+		color     string
+		wantColor bool
+	}{
+		{
+			name:      "without colors",
+			useColors: false,
+			text:      "Test",
+			color:     colorRed,
+			wantColor: false,
+		},
+		{
+			name:      "with colors",
+			useColors: true,
+			text:      "Test",
+			color:     colorRed,
+			wantColor: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			formatter := &MarkdownFormatter{UseColors: tt.useColors}
+			result := formatter.colorize(tt.text, tt.color)
+
+			hasColor := strings.Contains(result, tt.color)
+			if hasColor != tt.wantColor {
+				t.Errorf("colorize() has color codes = %v, want %v", hasColor, tt.wantColor)
+			}
+
+			if !strings.Contains(result, tt.text) {
+				t.Errorf("colorize() doesn't contain original text %q", tt.text)
+			}
+		})
+	}
+}
+
+func TestMarkdownFormatter_FormatContext(t *testing.T) {
+	formatter := &MarkdownFormatter{UseColors: false}
+
+	context := map[string]interface{}{
+		"schema":     "public",
+		"table":      "users",
+		"column":     "id",
+		"pattern":    "^id_",
+		"max_length": 64,
+	}
+
+	result := formatter.formatContext(context)
+
+	// Should not include schema, table, column (they're in location)
+	if strings.Contains(result, "schema") {
+		t.Error("formatContext() should skip schema field")
+	}
+
+	if strings.Contains(result, "table=") {
+		t.Error("formatContext() should skip table field")
+	}
+
+	if strings.Contains(result, "column=") {
+		t.Error("formatContext() should skip column field")
+	}
+
+	// Should include other fields
+	if !strings.Contains(result, "pattern") {
+		t.Error("formatContext() should include pattern field")
+	}
+
+	if !strings.Contains(result, "max_length") {
+		t.Error("formatContext() should include max_length field")
+	}
+}
+
+func TestMarkdownFormatter_FormatViolation(t *testing.T) {
+	formatter := &MarkdownFormatter{UseColors: false}
+
+	violation := ValidationResult{
+		RuleName: "test_rule",
+		Level:    "error",
+		Message:  "Test violation message",
+		Location: "public.users.id",
+		Passed:   false,
+		Context: map[string]interface{}{
+			"pattern": "^id_",
+		},
+	}
+
+	result := formatter.formatViolation(violation, colorRed)
+
+	if !strings.Contains(result, "test_rule") {
+		t.Error("formatViolation() should include rule name")
+	}
+
+	if !strings.Contains(result, "Test violation message") {
+		t.Error("formatViolation() should include message")
+	}
+
+	if !strings.Contains(result, "public.users.id") {
+		t.Error("formatViolation() should include location")
+	}
+
+	if !strings.Contains(result, "Location:") {
+		t.Error("formatViolation() should include Location label")
+	}
+
+	if !strings.Contains(result, "Message:") {
+		t.Error("formatViolation() should include Message label")
+	}
+}
+
+func TestReportFormatConstants(t *testing.T) {
+	// Test that color constants are defined
+	if colorReset == "" {
+		t.Error("colorReset is not defined")
+	}
+
+	if colorRed == "" {
+		t.Error("colorRed is not defined")
+	}
+
+	if colorYellow == "" {
+		t.Error("colorYellow is not defined")
+	}
+
+	if colorGreen == "" {
+		t.Error("colorGreen is not defined")
+	}
+
+	if colorBold == "" {
+		t.Error("colorBold is not defined")
+	}
+}

pkg/inspector/rules_test.go

@@ -0,0 +1,249 @@
+package inspector
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestGetDefaultConfig(t *testing.T) {
+	config := GetDefaultConfig()
+
+	if config == nil {
+		t.Fatal("GetDefaultConfig() returned nil")
+	}
+
+	if config.Version != "1.0" {
+		t.Errorf("GetDefaultConfig() Version = %q, want \"1.0\"", config.Version)
+	}
+
+	if len(config.Rules) == 0 {
+		t.Error("GetDefaultConfig() returned no rules")
+	}
+
+	// Check that all expected rules are present
+	expectedRules := []string{
+		"primary_key_naming",
+		"primary_key_datatype",
+		"primary_key_auto_increment",
+		"foreign_key_column_naming",
+		"foreign_key_constraint_naming",
+		"foreign_key_index",
+		"table_naming_case",
+		"column_naming_case",
+		"table_name_length",
+		"column_name_length",
+		"reserved_keywords",
+		"missing_primary_key",
+		"orphaned_foreign_key",
+		"circular_dependency",
+	}
+
+	for _, ruleName := range expectedRules {
+		if _, exists := config.Rules[ruleName]; !exists {
+			t.Errorf("GetDefaultConfig() missing rule: %q", ruleName)
+		}
+	}
+}
+
+func TestLoadConfig_NonExistentFile(t *testing.T) {
+	// Try to load a non-existent file
+	config, err := LoadConfig("/path/to/nonexistent/file.yaml")
+
+	if err != nil {
+		t.Fatalf("LoadConfig() with non-existent file returned error: %v", err)
+	}
+
+	// Should return default config
+	if config == nil {
+		t.Fatal("LoadConfig() returned nil config for non-existent file")
+	}
+
+	if len(config.Rules) == 0 {
+		t.Error("LoadConfig() returned config with no rules")
+	}
+}
+
+func TestLoadConfig_ValidFile(t *testing.T) {
+	// Create a temporary config file
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "test-config.yaml")
+
+	configContent := `version: "1.0"
+rules:
+  primary_key_naming:
+    enabled: "enforce"
+    function: "primary_key_naming"
+    pattern: "^pk_"
+    message: "Primary keys must start with pk_"
+  table_name_length:
+    enabled: "warn"
+    function: "table_name_length"
+    max_length: 50
+    message: "Table name too long"
+`
+
+	err := os.WriteFile(configPath, []byte(configContent), 0644)
+	if err != nil {
+		t.Fatalf("Failed to create test config file: %v", err)
+	}
+
+	config, err := LoadConfig(configPath)
+	if err != nil {
+		t.Fatalf("LoadConfig() returned error: %v", err)
+	}
+
+	if config.Version != "1.0" {
+		t.Errorf("LoadConfig() Version = %q, want \"1.0\"", config.Version)
+	}
+
+	if len(config.Rules) != 2 {
+		t.Errorf("LoadConfig() loaded %d rules, want 2", len(config.Rules))
+	}
+
+	// Check primary_key_naming rule
+	pkRule, exists := config.Rules["primary_key_naming"]
+	if !exists {
+		t.Fatal("LoadConfig() missing primary_key_naming rule")
+	}
+
+	if pkRule.Enabled != "enforce" {
+		t.Errorf("primary_key_naming.Enabled = %q, want \"enforce\"", pkRule.Enabled)
+	}
+
+	if pkRule.Pattern != "^pk_" {
+		t.Errorf("primary_key_naming.Pattern = %q, want \"^pk_\"", pkRule.Pattern)
+	}
+
+	// Check table_name_length rule
+	lengthRule, exists := config.Rules["table_name_length"]
+	if !exists {
+		t.Fatal("LoadConfig() missing table_name_length rule")
+	}
+
+	if lengthRule.MaxLength != 50 {
+		t.Errorf("table_name_length.MaxLength = %d, want 50", lengthRule.MaxLength)
+	}
+}
+
+func TestLoadConfig_InvalidYAML(t *testing.T) {
+	// Create a temporary invalid config file
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "invalid-config.yaml")
+
+	invalidContent := `invalid: yaml: content: {[}]`
+
+	err := os.WriteFile(configPath, []byte(invalidContent), 0644)
+	if err != nil {
+		t.Fatalf("Failed to create test config file: %v", err)
+	}
+
+	_, err = LoadConfig(configPath)
+	if err == nil {
+		t.Error("LoadConfig() with invalid YAML did not return error")
+	}
+}
+
+func TestRuleIsEnabled(t *testing.T) {
+	tests := []struct {
+		name string
+		rule Rule
+		want bool
+	}{
+		{
+			name: "enforce is enabled",
+			rule: Rule{Enabled: "enforce"},
+			want: true,
+		},
+		{
+			name: "warn is enabled",
+			rule: Rule{Enabled: "warn"},
+			want: true,
+		},
+		{
+			name: "off is not enabled",
+			rule: Rule{Enabled: "off"},
+			want: false,
+		},
+		{
+			name: "empty is not enabled",
+			rule: Rule{Enabled: ""},
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.rule.IsEnabled(); got != tt.want {
+				t.Errorf("Rule.IsEnabled() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestRuleIsEnforced(t *testing.T) {
+	tests := []struct {
+		name string
+		rule Rule
+		want bool
+	}{
+		{
+			name: "enforce is enforced",
+			rule: Rule{Enabled: "enforce"},
+			want: true,
+		},
+		{
+			name: "warn is not enforced",
+			rule: Rule{Enabled: "warn"},
+			want: false,
+		},
+		{
+			name: "off is not enforced",
+			rule: Rule{Enabled: "off"},
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.rule.IsEnforced(); got != tt.want {
+				t.Errorf("Rule.IsEnforced() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestDefaultConfigRuleSettings(t *testing.T) {
+	config := GetDefaultConfig()
+
+	// Test specific rule settings
+	pkNamingRule := config.Rules["primary_key_naming"]
+	if pkNamingRule.Function != "primary_key_naming" {
+		t.Errorf("primary_key_naming.Function = %q, want \"primary_key_naming\"", pkNamingRule.Function)
+	}
+
+	if pkNamingRule.Pattern != "^id_" {
+		t.Errorf("primary_key_naming.Pattern = %q, want \"^id_\"", pkNamingRule.Pattern)
+	}
+
+	// Test datatype rule
+	pkDatatypeRule := config.Rules["primary_key_datatype"]
+	if len(pkDatatypeRule.AllowedTypes) == 0 {
+		t.Error("primary_key_datatype has no allowed types")
+	}
+
+	// Test length rule
+	tableLengthRule := config.Rules["table_name_length"]
+	if tableLengthRule.MaxLength != 64 {
+		t.Errorf("table_name_length.MaxLength = %d, want 64", tableLengthRule.MaxLength)
+	}
+
+	// Test reserved keywords rule
+	reservedRule := config.Rules["reserved_keywords"]
+	if !reservedRule.CheckTables {
+		t.Error("reserved_keywords.CheckTables should be true")
+	}
+	if !reservedRule.CheckColumns {
+		t.Error("reserved_keywords.CheckColumns should be true")
+	}
+}

pkg/inspector/validators_test.go

@@ -0,0 +1,837 @@
+package inspector
+
+import (
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// Helper function to create test database
+func createTestDatabase() *models.Database {
+	return &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "users",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:          "id",
+								Type:          "bigserial",
+								IsPrimaryKey:  true,
+								AutoIncrement: true,
+							},
+							"username": {
+								Name:         "username",
+								Type:         "varchar(50)",
+								NotNull:      true,
+								IsPrimaryKey: false,
+							},
+							"rid_organization": {
+								Name:         "rid_organization",
+								Type:         "bigint",
+								NotNull:      true,
+								IsPrimaryKey: false,
+							},
+						},
+						Constraints: map[string]*models.Constraint{
+							"fk_users_organization": {
+								Name:              "fk_users_organization",
+								Type:              models.ForeignKeyConstraint,
+								Columns:           []string{"rid_organization"},
+								ReferencedTable:   "organizations",
+								ReferencedSchema:  "public",
+								ReferencedColumns: []string{"id"},
+							},
+						},
+						Indexes: map[string]*models.Index{
+							"idx_rid_organization": {
+								Name:    "idx_rid_organization",
+								Columns: []string{"rid_organization"},
+							},
+						},
+					},
+					{
+						Name: "organizations",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:          "id",
+								Type:          "bigserial",
+								IsPrimaryKey:  true,
+								AutoIncrement: true,
+							},
+							"name": {
+								Name:         "name",
+								Type:         "varchar(100)",
+								NotNull:      true,
+								IsPrimaryKey: false,
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func TestValidatePrimaryKeyNaming(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "matching pattern id",
+			rule: Rule{
+				Pattern: "^id$",
+				Message: "Primary key should be 'id'",
+			},
+			wantLen:  2,
+			wantPass: true,
+		},
+		{
+			name: "non-matching pattern id_",
+			rule: Rule{
+				Pattern: "^id_",
+				Message: "Primary key should start with 'id_'",
+			},
+			wantLen:  2,
+			wantPass: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validatePrimaryKeyNaming(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validatePrimaryKeyNaming() returned %d results, want %d", len(results), tt.wantLen)
+			}
+			if len(results) > 0 && results[0].Passed != tt.wantPass {
+				t.Errorf("validatePrimaryKeyNaming() passed=%v, want %v", results[0].Passed, tt.wantPass)
+			}
+		})
+	}
+}
+
+func TestValidatePrimaryKeyDatatype(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "allowed type bigserial",
+			rule: Rule{
+				AllowedTypes: []string{"bigserial", "bigint", "int"},
+				Message:      "Primary key should use integer types",
+			},
+			wantLen:  2,
+			wantPass: true,
+		},
+		{
+			name: "disallowed type",
+			rule: Rule{
+				AllowedTypes: []string{"uuid"},
+				Message:      "Primary key should use UUID",
+			},
+			wantLen:  2,
+			wantPass: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validatePrimaryKeyDatatype(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validatePrimaryKeyDatatype() returned %d results, want %d", len(results), tt.wantLen)
+			}
+			if len(results) > 0 && results[0].Passed != tt.wantPass {
+				t.Errorf("validatePrimaryKeyDatatype() passed=%v, want %v", results[0].Passed, tt.wantPass)
+			}
+		})
+	}
+}
+
+func TestValidatePrimaryKeyAutoIncrement(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name    string
+		rule    Rule
+		wantLen int
+	}{
+		{
+			name: "require auto increment",
+			rule: Rule{
+				RequireAutoIncrement: true,
+				Message:              "Primary key should have auto-increment",
+			},
+			wantLen: 0, // No violations - all PKs have auto-increment
+		},
+		{
+			name: "disallow auto increment",
+			rule: Rule{
+				RequireAutoIncrement: false,
+				Message:              "Primary key should not have auto-increment",
+			},
+			wantLen: 2, // 2 violations - both PKs have auto-increment
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validatePrimaryKeyAutoIncrement(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validatePrimaryKeyAutoIncrement() returned %d results, want %d", len(results), tt.wantLen)
+			}
+		})
+	}
+}
+
+func TestValidateForeignKeyColumnNaming(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "matching pattern rid_",
+			rule: Rule{
+				Pattern: "^rid_",
+				Message: "Foreign key columns should start with 'rid_'",
+			},
+			wantLen:  1,
+			wantPass: true,
+		},
+		{
+			name: "non-matching pattern fk_",
+			rule: Rule{
+				Pattern: "^fk_",
+				Message: "Foreign key columns should start with 'fk_'",
+			},
+			wantLen:  1,
+			wantPass: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateForeignKeyColumnNaming(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateForeignKeyColumnNaming() returned %d results, want %d", len(results), tt.wantLen)
+			}
+			if len(results) > 0 && results[0].Passed != tt.wantPass {
+				t.Errorf("validateForeignKeyColumnNaming() passed=%v, want %v", results[0].Passed, tt.wantPass)
+			}
+		})
+	}
+}
+
+func TestValidateForeignKeyConstraintNaming(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "matching pattern fk_",
+			rule: Rule{
+				Pattern: "^fk_",
+				Message: "Foreign key constraints should start with 'fk_'",
+			},
+			wantLen:  1,
+			wantPass: true,
+		},
+		{
+			name: "non-matching pattern FK_",
+			rule: Rule{
+				Pattern: "^FK_",
+				Message: "Foreign key constraints should start with 'FK_'",
+			},
+			wantLen:  1,
+			wantPass: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateForeignKeyConstraintNaming(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateForeignKeyConstraintNaming() returned %d results, want %d", len(results), tt.wantLen)
+			}
+			if len(results) > 0 && results[0].Passed != tt.wantPass {
+				t.Errorf("validateForeignKeyConstraintNaming() passed=%v, want %v", results[0].Passed, tt.wantPass)
+			}
+		})
+	}
+}
+
+func TestValidateForeignKeyIndex(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "require index with index present",
+			rule: Rule{
+				RequireIndex: true,
+				Message:      "Foreign key columns should have indexes",
+			},
+			wantLen:  1,
+			wantPass: true,
+		},
+		{
+			name: "no requirement",
+			rule: Rule{
+				RequireIndex: false,
+				Message:      "Foreign key index check disabled",
+			},
+			wantLen:  0,
+			wantPass: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateForeignKeyIndex(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateForeignKeyIndex() returned %d results, want %d", len(results), tt.wantLen)
+			}
+			if len(results) > 0 && results[0].Passed != tt.wantPass {
+				t.Errorf("validateForeignKeyIndex() passed=%v, want %v", results[0].Passed, tt.wantPass)
+			}
+		})
+	}
+}
+
+func TestValidateTableNamingCase(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "lowercase snake_case pattern",
+			rule: Rule{
+				Pattern: "^[a-z][a-z0-9_]*$",
+				Case:    "lowercase",
+				Message: "Table names should be lowercase snake_case",
+			},
+			wantLen:  2,
+			wantPass: true,
+		},
+		{
+			name: "uppercase pattern",
+			rule: Rule{
+				Pattern: "^[A-Z][A-Z0-9_]*$",
+				Case:    "uppercase",
+				Message: "Table names should be uppercase",
+			},
+			wantLen:  2,
+			wantPass: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateTableNamingCase(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateTableNamingCase() returned %d results, want %d", len(results), tt.wantLen)
+			}
+			if len(results) > 0 && results[0].Passed != tt.wantPass {
+				t.Errorf("validateTableNamingCase() passed=%v, want %v", results[0].Passed, tt.wantPass)
+			}
+		})
+	}
+}
+
+func TestValidateColumnNamingCase(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "lowercase snake_case pattern",
+			rule: Rule{
+				Pattern: "^[a-z][a-z0-9_]*$",
+				Case:    "lowercase",
+				Message: "Column names should be lowercase snake_case",
+			},
+			wantLen:  5, // 5 total columns across both tables
+			wantPass: true,
+		},
+		{
+			name: "camelCase pattern",
+			rule: Rule{
+				Pattern: "^[a-z][a-zA-Z0-9]*$",
+				Case:    "camelCase",
+				Message: "Column names should be camelCase",
+			},
+			wantLen:  5,
+			wantPass: false, // rid_organization has underscore
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateColumnNamingCase(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateColumnNamingCase() returned %d results, want %d", len(results), tt.wantLen)
+			}
+		})
+	}
+}
+
+func TestValidateTableNameLength(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "max length 64",
+			rule: Rule{
+				MaxLength: 64,
+				Message:   "Table name too long",
+			},
+			wantLen:  2,
+			wantPass: true,
+		},
+		{
+			name: "max length 5",
+			rule: Rule{
+				MaxLength: 5,
+				Message:   "Table name too long",
+			},
+			wantLen:  2,
+			wantPass: false, // "users" is 5 chars (passes), "organizations" is 13 (fails)
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateTableNameLength(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateTableNameLength() returned %d results, want %d", len(results), tt.wantLen)
+			}
+		})
+	}
+}
+
+func TestValidateColumnNameLength(t *testing.T) {
+	db := createTestDatabase()
+
+	tests := []struct {
+		name     string
+		rule     Rule
+		wantLen  int
+		wantPass bool
+	}{
+		{
+			name: "max length 64",
+			rule: Rule{
+				MaxLength: 64,
+				Message:   "Column name too long",
+			},
+			wantLen:  5,
+			wantPass: true,
+		},
+		{
+			name: "max length 5",
+			rule: Rule{
+				MaxLength: 5,
+				Message:   "Column name too long",
+			},
+			wantLen:  5,
+			wantPass: false, // Some columns exceed 5 chars
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateColumnNameLength(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateColumnNameLength() returned %d results, want %d", len(results), tt.wantLen)
+			}
+		})
+	}
+}
+
+func TestValidateReservedKeywords(t *testing.T) {
+	// Create a database with reserved keywords
+	db := &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "user", // "user" is a reserved keyword
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:         "id",
+								Type:         "bigint",
+								IsPrimaryKey: true,
+							},
+							"select": { // "select" is a reserved keyword
+								Name: "select",
+								Type: "varchar(50)",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	tests := []struct {
+		name        string
+		rule        Rule
+		wantLen     int
+		checkPasses bool
+	}{
+		{
+			name: "check tables only",
+			rule: Rule{
+				CheckTables:  true,
+				CheckColumns: false,
+				Message:      "Reserved keyword used",
+			},
+			wantLen:     1, // "user" table
+			checkPasses: false,
+		},
+		{
+			name: "check columns only",
+			rule: Rule{
+				CheckTables:  false,
+				CheckColumns: true,
+				Message:      "Reserved keyword used",
+			},
+			wantLen:     2, // "id", "select" columns (id passes, select fails)
+			checkPasses: false,
+		},
+		{
+			name: "check both",
+			rule: Rule{
+				CheckTables:  true,
+				CheckColumns: true,
+				Message:      "Reserved keyword used",
+			},
+			wantLen:     3, // "user" table + "id", "select" columns
+			checkPasses: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			results := validateReservedKeywords(db, tt.rule, "test_rule")
+			if len(results) != tt.wantLen {
+				t.Errorf("validateReservedKeywords() returned %d results, want %d", len(results), tt.wantLen)
+			}
+		})
+	}
+}
+
+func TestValidateMissingPrimaryKey(t *testing.T) {
+	// Create database with and without primary keys
+	db := &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "with_pk",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:         "id",
+								Type:         "bigint",
+								IsPrimaryKey: true,
+							},
+						},
+					},
+					{
+						Name: "without_pk",
+						Columns: map[string]*models.Column{
+							"name": {
+								Name: "name",
+								Type: "varchar(50)",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	rule := Rule{
+		Message: "Table missing primary key",
+	}
+
+	results := validateMissingPrimaryKey(db, rule, "test_rule")
+
+	if len(results) != 2 {
+		t.Errorf("validateMissingPrimaryKey() returned %d results, want 2", len(results))
+	}
+
+	// First result should pass (with_pk has PK)
+	if results[0].Passed != true {
+		t.Errorf("validateMissingPrimaryKey() result[0].Passed=%v, want true", results[0].Passed)
+	}
+
+	// Second result should fail (without_pk missing PK)
+	if results[1].Passed != false {
+		t.Errorf("validateMissingPrimaryKey() result[1].Passed=%v, want false", results[1].Passed)
+	}
+}
+
+func TestValidateOrphanedForeignKey(t *testing.T) {
+	// Create database with orphaned FK
+	db := &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "users",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:         "id",
+								Type:         "bigint",
+								IsPrimaryKey: true,
+							},
+						},
+						Constraints: map[string]*models.Constraint{
+							"fk_nonexistent": {
+								Name:             "fk_nonexistent",
+								Type:             models.ForeignKeyConstraint,
+								Columns:          []string{"rid_organization"},
+								ReferencedTable:  "nonexistent_table",
+								ReferencedSchema: "public",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	rule := Rule{
+		Message: "Foreign key references non-existent table",
+	}
+
+	results := validateOrphanedForeignKey(db, rule, "test_rule")
+
+	if len(results) != 1 {
+		t.Errorf("validateOrphanedForeignKey() returned %d results, want 1", len(results))
+	}
+
+	if results[0].Passed != false {
+		t.Errorf("validateOrphanedForeignKey() passed=%v, want false", results[0].Passed)
+	}
+}
+
+func TestValidateCircularDependency(t *testing.T) {
+	// Create database with circular dependency
+	db := &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "table_a",
+						Columns: map[string]*models.Column{
+							"id": {Name: "id", Type: "bigint", IsPrimaryKey: true},
+						},
+						Constraints: map[string]*models.Constraint{
+							"fk_to_b": {
+								Name:             "fk_to_b",
+								Type:             models.ForeignKeyConstraint,
+								ReferencedTable:  "table_b",
+								ReferencedSchema: "public",
+							},
+						},
+					},
+					{
+						Name: "table_b",
+						Columns: map[string]*models.Column{
+							"id": {Name: "id", Type: "bigint", IsPrimaryKey: true},
+						},
+						Constraints: map[string]*models.Constraint{
+							"fk_to_a": {
+								Name:             "fk_to_a",
+								Type:             models.ForeignKeyConstraint,
+								ReferencedTable:  "table_a",
+								ReferencedSchema: "public",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	rule := Rule{
+		Message: "Circular dependency detected",
+	}
+
+	results := validateCircularDependency(db, rule, "test_rule")
+
+	// Should detect circular dependency in both tables
+	if len(results) == 0 {
+		t.Error("validateCircularDependency() returned 0 results, expected circular dependency detection")
+	}
+
+	for _, result := range results {
+		if result.Passed {
+			t.Error("validateCircularDependency() passed=true, want false for circular dependency")
+		}
+	}
+}
+
+func TestNormalizeDataType(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"varchar(50)", "varchar"},
+		{"decimal(10,2)", "decimal"},
+		{"int", "int"},
+		{"BIGINT", "bigint"},
+		{"VARCHAR(255)", "varchar"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			result := normalizeDataType(tt.input)
+			if result != tt.expected {
+				t.Errorf("normalizeDataType(%q) = %q, want %q", tt.input, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestContains(t *testing.T) {
+	tests := []struct {
+		name     string
+		slice    []string
+		value    string
+		expected bool
+	}{
+		{"found exact", []string{"foo", "bar", "baz"}, "bar", true},
+		{"not found", []string{"foo", "bar", "baz"}, "qux", false},
+		{"case insensitive match", []string{"foo", "Bar", "baz"}, "bar", true},
+		{"empty slice", []string{}, "foo", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := contains(tt.slice, tt.value)
+			if result != tt.expected {
+				t.Errorf("contains(%v, %q) = %v, want %v", tt.slice, tt.value, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestHasCycle(t *testing.T) {
+	tests := []struct {
+		name     string
+		graph    map[string][]string
+		node     string
+		expected bool
+	}{
+		{
+			name: "simple cycle",
+			graph: map[string][]string{
+				"A": {"B"},
+				"B": {"C"},
+				"C": {"A"},
+			},
+			node:     "A",
+			expected: true,
+		},
+		{
+			name: "no cycle",
+			graph: map[string][]string{
+				"A": {"B"},
+				"B": {"C"},
+				"C": {},
+			},
+			node:     "A",
+			expected: false,
+		},
+		{
+			name: "self cycle",
+			graph: map[string][]string{
+				"A": {"A"},
+			},
+			node:     "A",
+			expected: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			visited := make(map[string]bool)
+			recStack := make(map[string]bool)
+			result := hasCycle(tt.node, tt.graph, visited, recStack)
+			if result != tt.expected {
+				t.Errorf("hasCycle() = %v, want %v", result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestFormatLocation(t *testing.T) {
+	tests := []struct {
+		schema   string
+		table    string
+		column   string
+		expected string
+	}{
+		{"public", "users", "id", "public.users.id"},
+		{"public", "users", "", "public.users"},
+		{"public", "", "", "public"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.expected, func(t *testing.T) {
+			result := formatLocation(tt.schema, tt.table, tt.column)
+			if result != tt.expected {
+				t.Errorf("formatLocation(%q, %q, %q) = %q, want %q",
+					tt.schema, tt.table, tt.column, result, tt.expected)
+			}
+		})
+	}
+}

pkg/merge/merge.go

@@ -0,0 +1,627 @@
+// Package merge provides utilities for merging database schemas.
+// It allows combining schemas from multiple sources while avoiding duplicates,
+// supporting only additive operations (no deletion or modification of existing items).
+package merge
+
+import (
+	"fmt"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// MergeResult represents the result of a merge operation
+type MergeResult struct {
+	SchemasAdded     int
+	TablesAdded      int
+	ColumnsAdded     int
+	ConstraintsAdded int
+	IndexesAdded     int
+	RelationsAdded   int
+	DomainsAdded     int
+	EnumsAdded       int
+	ViewsAdded       int
+	SequencesAdded   int
+}
+
+// MergeOptions contains options for merge operations
+type MergeOptions struct {
+	SkipDomains    bool
+	SkipRelations  bool
+	SkipEnums      bool
+	SkipViews      bool
+	SkipSequences  bool
+	SkipTableNames map[string]bool // Tables to skip during merge (keyed by table name)
+}
+
+// MergeDatabases merges the source database into the target database.
+// Only adds missing items; existing items are not modified.
+func MergeDatabases(target, source *models.Database, opts *MergeOptions) *MergeResult {
+	if opts == nil {
+		opts = &MergeOptions{}
+	}
+
+	result := &MergeResult{}
+
+	if target == nil || source == nil {
+		return result
+	}
+
+	// Merge schemas and their contents
+	result.merge(target, source, opts)
+
+	return result
+}
+
+func (r *MergeResult) merge(target, source *models.Database, opts *MergeOptions) {
+	// Create maps of existing schemas for quick lookup
+	existingSchemas := make(map[string]*models.Schema)
+	for _, schema := range target.Schemas {
+		existingSchemas[schema.SQLName()] = schema
+	}
+
+	// Merge schemas
+	for _, srcSchema := range source.Schemas {
+		schemaName := srcSchema.SQLName()
+		if tgtSchema, exists := existingSchemas[schemaName]; exists {
+			// Schema exists, merge its contents
+			r.mergeSchemaContents(tgtSchema, srcSchema, opts)
+		} else {
+			// Schema doesn't exist, add it
+			newSchema := cloneSchema(srcSchema)
+			target.Schemas = append(target.Schemas, newSchema)
+			r.SchemasAdded++
+		}
+	}
+
+	// Merge domains if not skipped
+	if !opts.SkipDomains {
+		r.mergeDomains(target, source)
+	}
+}
+
+func (r *MergeResult) mergeSchemaContents(target, source *models.Schema, opts *MergeOptions) {
+	// Merge tables
+	r.mergeTables(target, source, opts)
+
+	// Merge views if not skipped
+	if !opts.SkipViews {
+		r.mergeViews(target, source)
+	}
+
+	// Merge sequences if not skipped
+	if !opts.SkipSequences {
+		r.mergeSequences(target, source)
+	}
+
+	// Merge enums if not skipped
+	if !opts.SkipEnums {
+		r.mergeEnums(target, source)
+	}
+
+	// Merge relations if not skipped
+	if !opts.SkipRelations {
+		r.mergeRelations(target, source)
+	}
+}
+
+func (r *MergeResult) mergeTables(schema *models.Schema, source *models.Schema, opts *MergeOptions) {
+	// Create map of existing tables
+	existingTables := make(map[string]*models.Table)
+	for _, table := range schema.Tables {
+		existingTables[table.SQLName()] = table
+	}
+
+	// Merge tables
+	for _, srcTable := range source.Tables {
+		tableName := srcTable.SQLName()
+
+		// Skip if table is in the skip list (case-insensitive)
+		if opts != nil && opts.SkipTableNames != nil && opts.SkipTableNames[strings.ToLower(tableName)] {
+			continue
+		}
+
+		if tgtTable, exists := existingTables[tableName]; exists {
+			// Table exists, merge its columns, constraints, and indexes
+			r.mergeColumns(tgtTable, srcTable)
+			r.mergeConstraints(tgtTable, srcTable)
+			r.mergeIndexes(tgtTable, srcTable)
+		} else {
+			// Table doesn't exist, add it
+			newTable := cloneTable(srcTable)
+			schema.Tables = append(schema.Tables, newTable)
+			r.TablesAdded++
+			// Count columns in the newly added table
+			r.ColumnsAdded += len(newTable.Columns)
+		}
+	}
+}
+
+func (r *MergeResult) mergeColumns(table *models.Table, srcTable *models.Table) {
+	// Create map of existing columns
+	existingColumns := make(map[string]*models.Column)
+	for colName := range table.Columns {
+		existingColumns[colName] = table.Columns[colName]
+	}
+
+	// Merge columns
+	for colName, srcCol := range srcTable.Columns {
+		if _, exists := existingColumns[colName]; !exists {
+			// Column doesn't exist, add it
+			newCol := cloneColumn(srcCol)
+			table.Columns[colName] = newCol
+			r.ColumnsAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeConstraints(table *models.Table, srcTable *models.Table) {
+	// Initialize constraints map if nil
+	if table.Constraints == nil {
+		table.Constraints = make(map[string]*models.Constraint)
+	}
+
+	// Create map of existing constraints
+	existingConstraints := make(map[string]*models.Constraint)
+	for constName := range table.Constraints {
+		existingConstraints[constName] = table.Constraints[constName]
+	}
+
+	// Merge constraints
+	for constName, srcConst := range srcTable.Constraints {
+		if _, exists := existingConstraints[constName]; !exists {
+			// Constraint doesn't exist, add it
+			newConst := cloneConstraint(srcConst)
+			table.Constraints[constName] = newConst
+			r.ConstraintsAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeIndexes(table *models.Table, srcTable *models.Table) {
+	// Initialize indexes map if nil
+	if table.Indexes == nil {
+		table.Indexes = make(map[string]*models.Index)
+	}
+
+	// Create map of existing indexes
+	existingIndexes := make(map[string]*models.Index)
+	for idxName := range table.Indexes {
+		existingIndexes[idxName] = table.Indexes[idxName]
+	}
+
+	// Merge indexes
+	for idxName, srcIdx := range srcTable.Indexes {
+		if _, exists := existingIndexes[idxName]; !exists {
+			// Index doesn't exist, add it
+			newIdx := cloneIndex(srcIdx)
+			table.Indexes[idxName] = newIdx
+			r.IndexesAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeViews(schema *models.Schema, source *models.Schema) {
+	// Create map of existing views
+	existingViews := make(map[string]*models.View)
+	for _, view := range schema.Views {
+		existingViews[view.SQLName()] = view
+	}
+
+	// Merge views
+	for _, srcView := range source.Views {
+		viewName := srcView.SQLName()
+		if _, exists := existingViews[viewName]; !exists {
+			// View doesn't exist, add it
+			newView := cloneView(srcView)
+			schema.Views = append(schema.Views, newView)
+			r.ViewsAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeSequences(schema *models.Schema, source *models.Schema) {
+	// Create map of existing sequences
+	existingSequences := make(map[string]*models.Sequence)
+	for _, seq := range schema.Sequences {
+		existingSequences[seq.SQLName()] = seq
+	}
+
+	// Merge sequences
+	for _, srcSeq := range source.Sequences {
+		seqName := srcSeq.SQLName()
+		if _, exists := existingSequences[seqName]; !exists {
+			// Sequence doesn't exist, add it
+			newSeq := cloneSequence(srcSeq)
+			schema.Sequences = append(schema.Sequences, newSeq)
+			r.SequencesAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeEnums(schema *models.Schema, source *models.Schema) {
+	// Create map of existing enums
+	existingEnums := make(map[string]*models.Enum)
+	for _, enum := range schema.Enums {
+		existingEnums[enum.SQLName()] = enum
+	}
+
+	// Merge enums
+	for _, srcEnum := range source.Enums {
+		enumName := srcEnum.SQLName()
+		if _, exists := existingEnums[enumName]; !exists {
+			// Enum doesn't exist, add it
+			newEnum := cloneEnum(srcEnum)
+			schema.Enums = append(schema.Enums, newEnum)
+			r.EnumsAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeRelations(schema *models.Schema, source *models.Schema) {
+	// Create map of existing relations
+	existingRelations := make(map[string]*models.Relationship)
+	for _, rel := range schema.Relations {
+		existingRelations[rel.SQLName()] = rel
+	}
+
+	// Merge relations
+	for _, srcRel := range source.Relations {
+		if _, exists := existingRelations[srcRel.SQLName()]; !exists {
+			// Relation doesn't exist, add it
+			newRel := cloneRelation(srcRel)
+			schema.Relations = append(schema.Relations, newRel)
+			r.RelationsAdded++
+		}
+	}
+}
+
+func (r *MergeResult) mergeDomains(target *models.Database, source *models.Database) {
+	// Create map of existing domains
+	existingDomains := make(map[string]*models.Domain)
+	for _, domain := range target.Domains {
+		existingDomains[domain.SQLName()] = domain
+	}
+
+	// Merge domains
+	for _, srcDomain := range source.Domains {
+		domainName := srcDomain.SQLName()
+		if _, exists := existingDomains[domainName]; !exists {
+			// Domain doesn't exist, add it
+			newDomain := cloneDomain(srcDomain)
+			target.Domains = append(target.Domains, newDomain)
+			r.DomainsAdded++
+		}
+	}
+}
+
+// Clone functions to create deep copies of models
+
+func cloneSchema(schema *models.Schema) *models.Schema {
+	if schema == nil {
+		return nil
+	}
+	newSchema := &models.Schema{
+		Name:        schema.Name,
+		Description: schema.Description,
+		Owner:       schema.Owner,
+		Comment:     schema.Comment,
+		Sequence:    schema.Sequence,
+		UpdatedAt:   schema.UpdatedAt,
+		Tables:      make([]*models.Table, 0),
+		Views:       make([]*models.View, 0),
+		Sequences:   make([]*models.Sequence, 0),
+		Enums:       make([]*models.Enum, 0),
+		Relations:   make([]*models.Relationship, 0),
+	}
+
+	if schema.Permissions != nil {
+		newSchema.Permissions = make(map[string]string)
+		for k, v := range schema.Permissions {
+			newSchema.Permissions[k] = v
+		}
+	}
+
+	if schema.Metadata != nil {
+		newSchema.Metadata = make(map[string]interface{})
+		for k, v := range schema.Metadata {
+			newSchema.Metadata[k] = v
+		}
+	}
+
+	if schema.Scripts != nil {
+		newSchema.Scripts = make([]*models.Script, len(schema.Scripts))
+		copy(newSchema.Scripts, schema.Scripts)
+	}
+
+	// Clone tables
+	for _, table := range schema.Tables {
+		newSchema.Tables = append(newSchema.Tables, cloneTable(table))
+	}
+
+	// Clone views
+	for _, view := range schema.Views {
+		newSchema.Views = append(newSchema.Views, cloneView(view))
+	}
+
+	// Clone sequences
+	for _, seq := range schema.Sequences {
+		newSchema.Sequences = append(newSchema.Sequences, cloneSequence(seq))
+	}
+
+	// Clone enums
+	for _, enum := range schema.Enums {
+		newSchema.Enums = append(newSchema.Enums, cloneEnum(enum))
+	}
+
+	// Clone relations
+	for _, rel := range schema.Relations {
+		newSchema.Relations = append(newSchema.Relations, cloneRelation(rel))
+	}
+
+	return newSchema
+}
+
+func cloneTable(table *models.Table) *models.Table {
+	if table == nil {
+		return nil
+	}
+	newTable := &models.Table{
+		Name:        table.Name,
+		Description: table.Description,
+		Schema:      table.Schema,
+		Comment:     table.Comment,
+		Sequence:    table.Sequence,
+		UpdatedAt:   table.UpdatedAt,
+		Columns:     make(map[string]*models.Column),
+		Constraints: make(map[string]*models.Constraint),
+		Indexes:     make(map[string]*models.Index),
+	}
+
+	if table.Metadata != nil {
+		newTable.Metadata = make(map[string]interface{})
+		for k, v := range table.Metadata {
+			newTable.Metadata[k] = v
+		}
+	}
+
+	// Clone columns
+	for colName, col := range table.Columns {
+		newTable.Columns[colName] = cloneColumn(col)
+	}
+
+	// Clone constraints
+	for constName, constraint := range table.Constraints {
+		newTable.Constraints[constName] = cloneConstraint(constraint)
+	}
+
+	// Clone indexes
+	for idxName, index := range table.Indexes {
+		newTable.Indexes[idxName] = cloneIndex(index)
+	}
+
+	return newTable
+}
+
+func cloneColumn(col *models.Column) *models.Column {
+	if col == nil {
+		return nil
+	}
+	newCol := &models.Column{
+		Name:          col.Name,
+		Type:          col.Type,
+		Description:   col.Description,
+		Comment:       col.Comment,
+		IsPrimaryKey:  col.IsPrimaryKey,
+		NotNull:       col.NotNull,
+		Default:       col.Default,
+		Precision:     col.Precision,
+		Scale:         col.Scale,
+		Length:        col.Length,
+		Sequence:      col.Sequence,
+		AutoIncrement: col.AutoIncrement,
+		Collation:     col.Collation,
+	}
+
+	return newCol
+}
+
+func cloneConstraint(constraint *models.Constraint) *models.Constraint {
+	if constraint == nil {
+		return nil
+	}
+	newConstraint := &models.Constraint{
+		Type:              constraint.Type,
+		Columns:           make([]string, len(constraint.Columns)),
+		ReferencedTable:   constraint.ReferencedTable,
+		ReferencedSchema:  constraint.ReferencedSchema,
+		ReferencedColumns: make([]string, len(constraint.ReferencedColumns)),
+		OnUpdate:          constraint.OnUpdate,
+		OnDelete:          constraint.OnDelete,
+		Expression:        constraint.Expression,
+		Name:              constraint.Name,
+		Deferrable:        constraint.Deferrable,
+		InitiallyDeferred: constraint.InitiallyDeferred,
+		Sequence:          constraint.Sequence,
+	}
+	copy(newConstraint.Columns, constraint.Columns)
+	copy(newConstraint.ReferencedColumns, constraint.ReferencedColumns)
+	return newConstraint
+}
+
+func cloneIndex(index *models.Index) *models.Index {
+	if index == nil {
+		return nil
+	}
+	newIndex := &models.Index{
+		Name:        index.Name,
+		Description: index.Description,
+		Table:       index.Table,
+		Schema:      index.Schema,
+		Columns:     make([]string, len(index.Columns)),
+		Unique:      index.Unique,
+		Type:        index.Type,
+		Where:       index.Where,
+		Concurrent:  index.Concurrent,
+		Include:     make([]string, len(index.Include)),
+		Comment:     index.Comment,
+		Sequence:    index.Sequence,
+	}
+	copy(newIndex.Columns, index.Columns)
+	copy(newIndex.Include, index.Include)
+	return newIndex
+}
+
+func cloneView(view *models.View) *models.View {
+	if view == nil {
+		return nil
+	}
+	newView := &models.View{
+		Name:        view.Name,
+		Description: view.Description,
+		Schema:      view.Schema,
+		Definition:  view.Definition,
+		Comment:     view.Comment,
+		Sequence:    view.Sequence,
+		Columns:     make(map[string]*models.Column),
+	}
+
+	if view.Metadata != nil {
+		newView.Metadata = make(map[string]interface{})
+		for k, v := range view.Metadata {
+			newView.Metadata[k] = v
+		}
+	}
+
+	// Clone columns
+	for colName, col := range view.Columns {
+		newView.Columns[colName] = cloneColumn(col)
+	}
+
+	return newView
+}
+
+func cloneSequence(seq *models.Sequence) *models.Sequence {
+	if seq == nil {
+		return nil
+	}
+	newSeq := &models.Sequence{
+		Name:          seq.Name,
+		Description:   seq.Description,
+		Schema:        seq.Schema,
+		StartValue:    seq.StartValue,
+		MinValue:      seq.MinValue,
+		MaxValue:      seq.MaxValue,
+		IncrementBy:   seq.IncrementBy,
+		CacheSize:     seq.CacheSize,
+		Cycle:         seq.Cycle,
+		OwnedByTable:  seq.OwnedByTable,
+		OwnedByColumn: seq.OwnedByColumn,
+		Comment:       seq.Comment,
+		Sequence:      seq.Sequence,
+	}
+	return newSeq
+}
+
+func cloneEnum(enum *models.Enum) *models.Enum {
+	if enum == nil {
+		return nil
+	}
+	newEnum := &models.Enum{
+		Name:   enum.Name,
+		Values: make([]string, len(enum.Values)),
+		Schema: enum.Schema,
+	}
+	copy(newEnum.Values, enum.Values)
+	return newEnum
+}
+
+func cloneRelation(rel *models.Relationship) *models.Relationship {
+	if rel == nil {
+		return nil
+	}
+	newRel := &models.Relationship{
+		Name:          rel.Name,
+		Type:          rel.Type,
+		FromTable:     rel.FromTable,
+		FromSchema:    rel.FromSchema,
+		FromColumns:   make([]string, len(rel.FromColumns)),
+		ToTable:       rel.ToTable,
+		ToSchema:      rel.ToSchema,
+		ToColumns:     make([]string, len(rel.ToColumns)),
+		ForeignKey:    rel.ForeignKey,
+		ThroughTable:  rel.ThroughTable,
+		ThroughSchema: rel.ThroughSchema,
+		Description:   rel.Description,
+		Sequence:      rel.Sequence,
+	}
+
+	if rel.Properties != nil {
+		newRel.Properties = make(map[string]string)
+		for k, v := range rel.Properties {
+			newRel.Properties[k] = v
+		}
+	}
+
+	copy(newRel.FromColumns, rel.FromColumns)
+	copy(newRel.ToColumns, rel.ToColumns)
+	return newRel
+}
+
+func cloneDomain(domain *models.Domain) *models.Domain {
+	if domain == nil {
+		return nil
+	}
+	newDomain := &models.Domain{
+		Name:        domain.Name,
+		Description: domain.Description,
+		Comment:     domain.Comment,
+		Sequence:    domain.Sequence,
+		Tables:      make([]*models.DomainTable, len(domain.Tables)),
+	}
+
+	if domain.Metadata != nil {
+		newDomain.Metadata = make(map[string]interface{})
+		for k, v := range domain.Metadata {
+			newDomain.Metadata[k] = v
+		}
+	}
+
+	copy(newDomain.Tables, domain.Tables)
+	return newDomain
+}
+
+// GetMergeSummary returns a human-readable summary of the merge result
+func GetMergeSummary(result *MergeResult) string {
+	if result == nil {
+		return "No merge result available"
+	}
+
+	lines := []string{
+		"=== Merge Summary ===",
+		fmt.Sprintf("Schemas added:     %d", result.SchemasAdded),
+		fmt.Sprintf("Tables added:      %d", result.TablesAdded),
+		fmt.Sprintf("Columns added:     %d", result.ColumnsAdded),
+		fmt.Sprintf("Constraints added: %d", result.ConstraintsAdded),
+		fmt.Sprintf("Indexes added:     %d", result.IndexesAdded),
+		fmt.Sprintf("Views added:       %d", result.ViewsAdded),
+		fmt.Sprintf("Sequences added:   %d", result.SequencesAdded),
+		fmt.Sprintf("Enums added:       %d", result.EnumsAdded),
+		fmt.Sprintf("Relations added:   %d", result.RelationsAdded),
+		fmt.Sprintf("Domains added:     %d", result.DomainsAdded),
+	}
+
+	totalAdded := result.SchemasAdded + result.TablesAdded + result.ColumnsAdded +
+		result.ConstraintsAdded + result.IndexesAdded +
+		result.ViewsAdded + result.SequencesAdded + result.EnumsAdded +
+		result.RelationsAdded + result.DomainsAdded
+
+	lines = append(lines, fmt.Sprintf("Total items added: %d", totalAdded))
+
+	summary := ""
+	for _, line := range lines {
+		summary += line + "\n"
+	}
+
+	return summary
+}

pkg/merge/merge_test.go

@@ -0,0 +1,617 @@
+package merge
+
+import (
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+func TestMergeDatabases_NilInputs(t *testing.T) {
+	result := MergeDatabases(nil, nil, nil)
+	if result == nil {
+		t.Fatal("Expected non-nil result")
+	}
+	if result.SchemasAdded != 0 {
+		t.Errorf("Expected 0 schemas added, got %d", result.SchemasAdded)
+	}
+}
+
+func TestMergeDatabases_NewSchema(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{Name: "public"},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{Name: "auth"},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.SchemasAdded != 1 {
+		t.Errorf("Expected 1 schema added, got %d", result.SchemasAdded)
+	}
+	if len(target.Schemas) != 2 {
+		t.Errorf("Expected 2 schemas in target, got %d", len(target.Schemas))
+	}
+}
+
+func TestMergeDatabases_ExistingSchema(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{Name: "public"},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{Name: "public"},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.SchemasAdded != 0 {
+		t.Errorf("Expected 0 schemas added, got %d", result.SchemasAdded)
+	}
+	if len(target.Schemas) != 1 {
+		t.Errorf("Expected 1 schema in target, got %d", len(target.Schemas))
+	}
+}
+
+func TestMergeTables_NewTable(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "posts",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.TablesAdded != 1 {
+		t.Errorf("Expected 1 table added, got %d", result.TablesAdded)
+	}
+	if len(target.Schemas[0].Tables) != 2 {
+		t.Errorf("Expected 2 tables in target schema, got %d", len(target.Schemas[0].Tables))
+	}
+}
+
+func TestMergeColumns_NewColumn(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:   "users",
+						Schema: "public",
+						Columns: map[string]*models.Column{
+							"id": {Name: "id", Type: "int"},
+						},
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:   "users",
+						Schema: "public",
+						Columns: map[string]*models.Column{
+							"email": {Name: "email", Type: "varchar"},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.ColumnsAdded != 1 {
+		t.Errorf("Expected 1 column added, got %d", result.ColumnsAdded)
+	}
+	if len(target.Schemas[0].Tables[0].Columns) != 2 {
+		t.Errorf("Expected 2 columns in target table, got %d", len(target.Schemas[0].Tables[0].Columns))
+	}
+}
+
+func TestMergeConstraints_NewConstraint(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:        "users",
+						Schema:      "public",
+						Columns:     map[string]*models.Column{},
+						Constraints: map[string]*models.Constraint{},
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+						Constraints: map[string]*models.Constraint{
+							"ukey_users_email": {
+								Type:    models.UniqueConstraint,
+								Columns: []string{"email"},
+								Name:    "ukey_users_email",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.ConstraintsAdded != 1 {
+		t.Errorf("Expected 1 constraint added, got %d", result.ConstraintsAdded)
+	}
+	if len(target.Schemas[0].Tables[0].Constraints) != 1 {
+		t.Errorf("Expected 1 constraint in target table, got %d", len(target.Schemas[0].Tables[0].Constraints))
+	}
+}
+
+func TestMergeConstraints_NilConstraintsMap(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:        "users",
+						Schema:      "public",
+						Columns:     map[string]*models.Column{},
+						Constraints: nil, // Nil map
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+						Constraints: map[string]*models.Constraint{
+							"ukey_users_email": {
+								Type:    models.UniqueConstraint,
+								Columns: []string{"email"},
+								Name:    "ukey_users_email",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.ConstraintsAdded != 1 {
+		t.Errorf("Expected 1 constraint added, got %d", result.ConstraintsAdded)
+	}
+	if target.Schemas[0].Tables[0].Constraints == nil {
+		t.Error("Expected constraints map to be initialized")
+	}
+	if len(target.Schemas[0].Tables[0].Constraints) != 1 {
+		t.Errorf("Expected 1 constraint in target table, got %d", len(target.Schemas[0].Tables[0].Constraints))
+	}
+}
+
+func TestMergeIndexes_NewIndex(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+						Indexes: map[string]*models.Index{},
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+						Indexes: map[string]*models.Index{
+							"idx_users_email": {
+								Name:    "idx_users_email",
+								Columns: []string{"email"},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.IndexesAdded != 1 {
+		t.Errorf("Expected 1 index added, got %d", result.IndexesAdded)
+	}
+	if len(target.Schemas[0].Tables[0].Indexes) != 1 {
+		t.Errorf("Expected 1 index in target table, got %d", len(target.Schemas[0].Tables[0].Indexes))
+	}
+}
+
+func TestMergeIndexes_NilIndexesMap(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+						Indexes: nil, // Nil map
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+						Indexes: map[string]*models.Index{
+							"idx_users_email": {
+								Name:    "idx_users_email",
+								Columns: []string{"email"},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.IndexesAdded != 1 {
+		t.Errorf("Expected 1 index added, got %d", result.IndexesAdded)
+	}
+	if target.Schemas[0].Tables[0].Indexes == nil {
+		t.Error("Expected indexes map to be initialized")
+	}
+	if len(target.Schemas[0].Tables[0].Indexes) != 1 {
+		t.Errorf("Expected 1 index in target table, got %d", len(target.Schemas[0].Tables[0].Indexes))
+	}
+}
+
+func TestMergeOptions_SkipTableNames(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "users",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:    "migrations",
+						Schema:  "public",
+						Columns: map[string]*models.Column{},
+					},
+				},
+			},
+		},
+	}
+
+	opts := &MergeOptions{
+		SkipTableNames: map[string]bool{
+			"migrations": true,
+		},
+	}
+
+	result := MergeDatabases(target, source, opts)
+	if result.TablesAdded != 0 {
+		t.Errorf("Expected 0 tables added (skipped), got %d", result.TablesAdded)
+	}
+	if len(target.Schemas[0].Tables) != 1 {
+		t.Errorf("Expected 1 table in target schema, got %d", len(target.Schemas[0].Tables))
+	}
+}
+
+func TestMergeViews_NewView(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name:  "public",
+				Views: []*models.View{},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Views: []*models.View{
+					{
+						Name:       "user_summary",
+						Schema:     "public",
+						Definition: "SELECT * FROM users",
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.ViewsAdded != 1 {
+		t.Errorf("Expected 1 view added, got %d", result.ViewsAdded)
+	}
+	if len(target.Schemas[0].Views) != 1 {
+		t.Errorf("Expected 1 view in target schema, got %d", len(target.Schemas[0].Views))
+	}
+}
+
+func TestMergeEnums_NewEnum(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name:  "public",
+				Enums: []*models.Enum{},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Enums: []*models.Enum{
+					{
+						Name:   "user_role",
+						Schema: "public",
+						Values: []string{"admin", "user"},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.EnumsAdded != 1 {
+		t.Errorf("Expected 1 enum added, got %d", result.EnumsAdded)
+	}
+	if len(target.Schemas[0].Enums) != 1 {
+		t.Errorf("Expected 1 enum in target schema, got %d", len(target.Schemas[0].Enums))
+	}
+}
+
+func TestMergeDomains_NewDomain(t *testing.T) {
+	target := &models.Database{
+		Domains: []*models.Domain{},
+	}
+	source := &models.Database{
+		Domains: []*models.Domain{
+			{
+				Name:        "auth",
+				Description: "Authentication domain",
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.DomainsAdded != 1 {
+		t.Errorf("Expected 1 domain added, got %d", result.DomainsAdded)
+	}
+	if len(target.Domains) != 1 {
+		t.Errorf("Expected 1 domain in target, got %d", len(target.Domains))
+	}
+}
+
+func TestMergeRelations_NewRelation(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name:      "public",
+				Relations: []*models.Relationship{},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Relations: []*models.Relationship{
+					{
+						Name:        "fk_posts_user",
+						Type:        models.OneToMany,
+						FromTable:   "posts",
+						FromColumns: []string{"user_id"},
+						ToTable:     "users",
+						ToColumns:   []string{"id"},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+	if result.RelationsAdded != 1 {
+		t.Errorf("Expected 1 relation added, got %d", result.RelationsAdded)
+	}
+	if len(target.Schemas[0].Relations) != 1 {
+		t.Errorf("Expected 1 relation in target schema, got %d", len(target.Schemas[0].Relations))
+	}
+}
+
+func TestGetMergeSummary(t *testing.T) {
+	result := &MergeResult{
+		SchemasAdded:     1,
+		TablesAdded:      2,
+		ColumnsAdded:     5,
+		ConstraintsAdded: 3,
+		IndexesAdded:     2,
+		ViewsAdded:       1,
+	}
+
+	summary := GetMergeSummary(result)
+	if summary == "" {
+		t.Error("Expected non-empty summary")
+	}
+	if len(summary) < 50 {
+		t.Errorf("Summary seems too short: %s", summary)
+	}
+}
+
+func TestGetMergeSummary_Nil(t *testing.T) {
+	summary := GetMergeSummary(nil)
+	if summary == "" {
+		t.Error("Expected non-empty summary for nil result")
+	}
+}
+
+func TestComplexMerge(t *testing.T) {
+	// Target with existing structure
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:   "users",
+						Schema: "public",
+						Columns: map[string]*models.Column{
+							"id": {Name: "id", Type: "int"},
+						},
+						Constraints: map[string]*models.Constraint{},
+						Indexes:     map[string]*models.Index{},
+					},
+				},
+			},
+		},
+	}
+
+	// Source with new columns, constraints, and indexes
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:   "users",
+						Schema: "public",
+						Columns: map[string]*models.Column{
+							"email": {Name: "email", Type: "varchar"},
+							"guid":  {Name: "guid", Type: "uuid"},
+						},
+						Constraints: map[string]*models.Constraint{
+							"ukey_users_email": {
+								Type:    models.UniqueConstraint,
+								Columns: []string{"email"},
+								Name:    "ukey_users_email",
+							},
+							"ukey_users_guid": {
+								Type:    models.UniqueConstraint,
+								Columns: []string{"guid"},
+								Name:    "ukey_users_guid",
+							},
+						},
+						Indexes: map[string]*models.Index{
+							"idx_users_email": {
+								Name:    "idx_users_email",
+								Columns: []string{"email"},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+
+	// Verify counts
+	if result.ColumnsAdded != 2 {
+		t.Errorf("Expected 2 columns added, got %d", result.ColumnsAdded)
+	}
+	if result.ConstraintsAdded != 2 {
+		t.Errorf("Expected 2 constraints added, got %d", result.ConstraintsAdded)
+	}
+	if result.IndexesAdded != 1 {
+		t.Errorf("Expected 1 index added, got %d", result.IndexesAdded)
+	}
+
+	// Verify target has merged data
+	table := target.Schemas[0].Tables[0]
+	if len(table.Columns) != 3 {
+		t.Errorf("Expected 3 columns in merged table, got %d", len(table.Columns))
+	}
+	if len(table.Constraints) != 2 {
+		t.Errorf("Expected 2 constraints in merged table, got %d", len(table.Constraints))
+	}
+	if len(table.Indexes) != 1 {
+		t.Errorf("Expected 1 index in merged table, got %d", len(table.Indexes))
+	}
+
+	// Verify specific constraint
+	if _, exists := table.Constraints["ukey_users_guid"]; !exists {
+		t.Error("Expected ukey_users_guid constraint to exist")
+	}
+}

pkg/models/models.go

@@ -4,7 +4,12 @@
 // intermediate representation for converting between various database schema formats.
 package models
 
-import "strings"
+import (
+	"strings"
+	"time"
+
+	"github.com/google/uuid"
+)
 
 // DatabaseType represents the type of database system.
 type DatabaseType string
@@ -21,10 +26,13 @@ type Database struct {
 	Name            string       `json:"name" yaml:"name"`
 	Description     string       `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
 	Schemas         []*Schema    `json:"schemas" yaml:"schemas" xml:"schemas"`
+	Domains         []*Domain    `json:"domains,omitempty" yaml:"domains,omitempty" xml:"domains,omitempty"`
 	Comment         string       `json:"comment,omitempty" yaml:"comment,omitempty" xml:"comment,omitempty"`
 	DatabaseType    DatabaseType `json:"database_type,omitempty" yaml:"database_type,omitempty" xml:"database_type,omitempty"`
 	DatabaseVersion string       `json:"database_version,omitempty" yaml:"database_version,omitempty" xml:"database_version,omitempty"`
 	SourceFormat    string       `json:"source_format,omitempty" yaml:"source_format,omitempty" xml:"source_format,omitempty"` // Source Format of the database.
+	UpdatedAt       string       `json:"updatedat,omitempty" yaml:"updatedat,omitempty" xml:"updatedat,omitempty"`
+	GUID            string       `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the database name in lowercase for SQL compatibility.
@@ -32,6 +40,39 @@ func (d *Database) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// UpdateDate sets the UpdatedAt field to the current time in RFC3339 format.
+func (d *Database) UpdateDate() {
+	d.UpdatedAt = time.Now().Format(time.RFC3339)
+}
+
+// Domain represents a logical business domain grouping multiple tables from potentially different schemas.
+// Domains allow for organizing database tables by functional areas (e.g., authentication, user data, financial).
+type Domain struct {
+	Name        string         `json:"name" yaml:"name" xml:"name"`
+	Description string         `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
+	Tables      []*DomainTable `json:"tables" yaml:"tables" xml:"tables"`
+	Comment     string         `json:"comment,omitempty" yaml:"comment,omitempty" xml:"comment,omitempty"`
+	Metadata    map[string]any `json:"metadata,omitempty" yaml:"metadata,omitempty" xml:"-"`
+	Sequence    uint           `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	GUID        string         `json:"guid" yaml:"guid" xml:"guid"`
+}
+
+// SQLName returns the domain name in lowercase for SQL compatibility.
+func (d *Domain) SQLName() string {
+	return strings.ToLower(d.Name)
+}
+
+// DomainTable represents a reference to a specific table within a domain.
+// It identifies the table by name and schema, allowing a single domain to include
+// tables from multiple schemas.
+type DomainTable struct {
+	TableName  string `json:"table_name" yaml:"table_name" xml:"table_name"`
+	SchemaName string `json:"schema_name" yaml:"schema_name" xml:"schema_name"`
+	Sequence   uint   `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	RefTable   *Table `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
+	GUID       string `json:"guid" yaml:"guid" xml:"guid"`
+}
+
 // Schema represents a database schema, which is a logical grouping of database objects
 // such as tables, views, sequences, and relationships within a database.
 type Schema struct {
@@ -49,6 +90,16 @@ type Schema struct {
 	RefDatabase *Database         `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
 	Relations   []*Relationship   `json:"relations,omitempty" yaml:"relations,omitempty" xml:"-"`
 	Enums       []*Enum           `json:"enums,omitempty" yaml:"enums,omitempty" xml:"enums"`
+	UpdatedAt   string            `json:"updatedat,omitempty" yaml:"updatedat,omitempty" xml:"updatedat,omitempty"`
+	GUID        string            `json:"guid" yaml:"guid" xml:"guid"`
+}
+
+// UpdaUpdateDateted sets the UpdatedAt field to the current time in RFC3339 format.
+func (d *Schema) UpdateDate() {
+	d.UpdatedAt = time.Now().Format(time.RFC3339)
+	if d.RefDatabase != nil {
+		d.RefDatabase.UpdateDate()
+	}
 }
 
 // SQLName returns the schema name in lowercase for SQL compatibility.
@@ -71,6 +122,16 @@ type Table struct {
 	Metadata      map[string]any           `json:"metadata,omitempty" yaml:"metadata,omitempty" xml:"-"`
 	Sequence      uint                     `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 	RefSchema     *Schema                  `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
+	UpdatedAt     string                   `json:"updatedat,omitempty" yaml:"updatedat,omitempty" xml:"updatedat,omitempty"`
+	GUID          string                   `json:"guid" yaml:"guid" xml:"guid"`
+}
+
+// UpdateDate sets the UpdatedAt field to the current time in RFC3339 format.
+func (d *Table) UpdateDate() {
+	d.UpdatedAt = time.Now().Format(time.RFC3339)
+	if d.RefSchema != nil {
+		d.RefSchema.UpdateDate()
+	}
 }
 
 // SQLName returns the table name in lowercase for SQL compatibility.
@@ -111,6 +172,7 @@ type View struct {
 	Metadata    map[string]any     `json:"metadata,omitempty" yaml:"metadata,omitempty" xml:"-"`
 	Sequence    uint               `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 	RefSchema   *Schema            `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
+	GUID        string             `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the view name in lowercase for SQL compatibility.
@@ -134,6 +196,7 @@ type Sequence struct {
 	Comment       string  `json:"comment,omitempty" yaml:"comment,omitempty" xml:"comment,omitempty"`
 	Sequence      uint    `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
 	RefSchema     *Schema `json:"-" yaml:"-" xml:"-"` // Excluded to prevent circular references
+	GUID          string  `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the sequence name in lowercase for SQL compatibility.
@@ -158,6 +221,7 @@ type Column struct {
 	Comment       string `json:"comment,omitempty" yaml:"comment,omitempty" xml:"comment,omitempty"`
 	Collation     string `json:"collation,omitempty" yaml:"collation,omitempty" xml:"collation,omitempty"`
 	Sequence      uint   `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	GUID          string `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the column name in lowercase for SQL compatibility.
@@ -180,6 +244,7 @@ type Index struct {
 	Include     []string `json:"include,omitempty" yaml:"include,omitempty" xml:"include,omitempty"` // INCLUDE columns
 	Comment     string   `json:"comment,omitempty" yaml:"comment,omitempty" xml:"comment,omitempty"`
 	Sequence    uint     `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	GUID        string   `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the index name in lowercase for SQL compatibility.
@@ -214,6 +279,7 @@ type Relationship struct {
 	ThroughSchema string            `json:"through_schema,omitempty" yaml:"through_schema,omitempty" xml:"through_schema,omitempty"`
 	Description   string            `json:"description,omitempty" yaml:"description,omitempty" xml:"description,omitempty"`
 	Sequence      uint              `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	GUID          string            `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the relationship name in lowercase for SQL compatibility.
@@ -238,6 +304,7 @@ type Constraint struct {
 	Deferrable        bool           `json:"deferrable,omitempty" yaml:"deferrable,omitempty" xml:"deferrable,omitempty"`
 	InitiallyDeferred bool           `json:"initially_deferred,omitempty" yaml:"initially_deferred,omitempty" xml:"initially_deferred,omitempty"`
 	Sequence          uint           `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	GUID              string         `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the constraint name in lowercase for SQL compatibility.
@@ -253,6 +320,7 @@ type Enum struct {
 	Name   string   `json:"name" yaml:"name" xml:"name"`
 	Values []string `json:"values" yaml:"values" xml:"values"`
 	Schema string   `json:"schema,omitempty" yaml:"schema,omitempty" xml:"schema,omitempty"`
+	GUID   string   `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the enum name in lowercase for SQL compatibility.
@@ -260,6 +328,16 @@ func (d *Enum) SQLName() string {
 	return strings.ToLower(d.Name)
 }
 
+// InitEnum initializes a new Enum with empty values slice
+func InitEnum(name, schema string) *Enum {
+	return &Enum{
+		Name:   name,
+		Schema: schema,
+		Values: make([]string, 0),
+		GUID:   uuid.New().String(),
+	}
+}
+
 // Supported constraint types.
 const (
 	PrimaryKeyConstraint ConstraintType = "primary_key" // Primary key uniquely identifies each record
@@ -281,6 +359,7 @@ type Script struct {
 	Version     string   `json:"version,omitempty" yaml:"version,omitempty" xml:"version,omitempty"`
 	Priority    int      `json:"priority,omitempty" yaml:"priority,omitempty" xml:"priority,omitempty"`
 	Sequence    uint     `json:"sequence,omitempty" yaml:"sequence,omitempty" xml:"sequence,omitempty"`
+	GUID        string   `json:"guid" yaml:"guid" xml:"guid"`
 }
 
 // SQLName returns the script name in lowercase for SQL compatibility.
@@ -295,6 +374,8 @@ func InitDatabase(name string) *Database {
 	return &Database{
 		Name:    name,
 		Schemas: make([]*Schema, 0),
+		Domains: make([]*Domain, 0),
+		GUID:    uuid.New().String(),
 	}
 }
 
@@ -308,6 +389,7 @@ func InitSchema(name string) *Schema {
 		Permissions: make(map[string]string),
 		Metadata:    make(map[string]any),
 		Scripts:     make([]*Script, 0),
+		GUID:        uuid.New().String(),
 	}
 }
 
@@ -321,6 +403,7 @@ func InitTable(name, schema string) *Table {
 		Indexes:       make(map[string]*Index),
 		Relationships: make(map[string]*Relationship),
 		Metadata:      make(map[string]any),
+		GUID:          uuid.New().String(),
 	}
 }
 
@@ -330,6 +413,7 @@ func InitColumn(name, table, schema string) *Column {
 		Name:   name,
 		Table:  table,
 		Schema: schema,
+		GUID:   uuid.New().String(),
 	}
 }
 
@@ -341,6 +425,7 @@ func InitIndex(name, table, schema string) *Index {
 		Schema:  schema,
 		Columns: make([]string, 0),
 		Include: make([]string, 0),
+		GUID:    uuid.New().String(),
 	}
 }
 
@@ -353,6 +438,7 @@ func InitRelation(name, schema string) *Relationship {
 		Properties:  make(map[string]string),
 		FromColumns: make([]string, 0),
 		ToColumns:   make([]string, 0),
+		GUID:        uuid.New().String(),
 	}
 }
 
@@ -362,6 +448,7 @@ func InitRelationship(name string, relType RelationType) *Relationship {
 		Name:       name,
 		Type:       relType,
 		Properties: make(map[string]string),
+		GUID:       uuid.New().String(),
 	}
 }
 
@@ -372,6 +459,7 @@ func InitConstraint(name string, constraintType ConstraintType) *Constraint {
 		Type:              constraintType,
 		Columns:           make([]string, 0),
 		ReferencedColumns: make([]string, 0),
+		GUID:              uuid.New().String(),
 	}
 }
 
@@ -380,6 +468,7 @@ func InitScript(name string) *Script {
 	return &Script{
 		Name:     name,
 		RunAfter: make([]string, 0),
+		GUID:     uuid.New().String(),
 	}
 }
 
@@ -390,6 +479,7 @@ func InitView(name, schema string) *View {
 		Schema:   schema,
 		Columns:  make(map[string]*Column),
 		Metadata: make(map[string]any),
+		GUID:     uuid.New().String(),
 	}
 }
 
@@ -400,5 +490,25 @@ func InitSequence(name, schema string) *Sequence {
 		Schema:      schema,
 		IncrementBy: 1,
 		StartValue:  1,
+		GUID:        uuid.New().String(),
+	}
+}
+
+// InitDomain initializes a new Domain with empty slices and maps
+func InitDomain(name string) *Domain {
+	return &Domain{
+		Name:     name,
+		Tables:   make([]*DomainTable, 0),
+		Metadata: make(map[string]any),
+		GUID:     uuid.New().String(),
+	}
+}
+
+// InitDomainTable initializes a new DomainTable reference
+func InitDomainTable(tableName, schemaName string) *DomainTable {
+	return &DomainTable{
+		TableName:  tableName,
+		SchemaName: schemaName,
+		GUID:       uuid.New().String(),
 	}
 }

pkg/models/sorting.go

@@ -0,0 +1,282 @@
+package models
+
+import (
+	"sort"
+	"strings"
+)
+
+// SortOrder represents the sort direction
+type SortOrder bool
+
+const (
+	// Ascending sort order
+	Ascending SortOrder = false
+	// Descending sort order
+	Descending SortOrder = true
+)
+
+// Schema Sorting
+
+// SortSchemasByName sorts schemas by name
+func SortSchemasByName(schemas []*Schema, desc bool) error {
+	sort.SliceStable(schemas, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(schemas[i].Name), strings.ToLower(schemas[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// SortSchemasBySequence sorts schemas by sequence number
+func SortSchemasBySequence(schemas []*Schema, desc bool) error {
+	sort.SliceStable(schemas, func(i, j int) bool {
+		if desc {
+			return schemas[i].Sequence > schemas[j].Sequence
+		}
+		return schemas[i].Sequence < schemas[j].Sequence
+	})
+	return nil
+}
+
+// Table Sorting
+
+// SortTablesByName sorts tables by name
+func SortTablesByName(tables []*Table, desc bool) error {
+	sort.SliceStable(tables, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(tables[i].Name), strings.ToLower(tables[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// SortTablesBySequence sorts tables by sequence number
+func SortTablesBySequence(tables []*Table, desc bool) error {
+	sort.SliceStable(tables, func(i, j int) bool {
+		if desc {
+			return tables[i].Sequence > tables[j].Sequence
+		}
+		return tables[i].Sequence < tables[j].Sequence
+	})
+	return nil
+}
+
+// Column Sorting
+
+// SortColumnsMapByName converts column map to sorted slice by name
+func SortColumnsMapByName(columns map[string]*Column, desc bool) []*Column {
+	result := make([]*Column, 0, len(columns))
+	for _, col := range columns {
+		result = append(result, col)
+	}
+	_ = SortColumnsByName(result, desc)
+	return result
+}
+
+// SortColumnsMapBySequence converts column map to sorted slice by sequence
+func SortColumnsMapBySequence(columns map[string]*Column, desc bool) []*Column {
+	result := make([]*Column, 0, len(columns))
+	for _, col := range columns {
+		result = append(result, col)
+	}
+	_ = SortColumnsBySequence(result, desc)
+	return result
+}
+
+// SortColumnsByName sorts columns by name
+func SortColumnsByName(columns []*Column, desc bool) error {
+	sort.SliceStable(columns, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(columns[i].Name), strings.ToLower(columns[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// SortColumnsBySequence sorts columns by sequence number
+func SortColumnsBySequence(columns []*Column, desc bool) error {
+	sort.SliceStable(columns, func(i, j int) bool {
+		if desc {
+			return columns[i].Sequence > columns[j].Sequence
+		}
+		return columns[i].Sequence < columns[j].Sequence
+	})
+	return nil
+}
+
+// View Sorting
+
+// SortViewsByName sorts views by name
+func SortViewsByName(views []*View, desc bool) error {
+	sort.SliceStable(views, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(views[i].Name), strings.ToLower(views[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// SortViewsBySequence sorts views by sequence number
+func SortViewsBySequence(views []*View, desc bool) error {
+	sort.SliceStable(views, func(i, j int) bool {
+		if desc {
+			return views[i].Sequence > views[j].Sequence
+		}
+		return views[i].Sequence < views[j].Sequence
+	})
+	return nil
+}
+
+// Sequence Sorting
+
+// SortSequencesByName sorts sequences by name
+func SortSequencesByName(sequences []*Sequence, desc bool) error {
+	sort.SliceStable(sequences, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(sequences[i].Name), strings.ToLower(sequences[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// SortSequencesBySequence sorts sequences by sequence number
+func SortSequencesBySequence(sequences []*Sequence, desc bool) error {
+	sort.SliceStable(sequences, func(i, j int) bool {
+		if desc {
+			return sequences[i].Sequence > sequences[j].Sequence
+		}
+		return sequences[i].Sequence < sequences[j].Sequence
+	})
+	return nil
+}
+
+// Index Sorting
+
+// SortIndexesMapByName converts index map to sorted slice by name
+func SortIndexesMapByName(indexes map[string]*Index, desc bool) []*Index {
+	result := make([]*Index, 0, len(indexes))
+	for _, idx := range indexes {
+		result = append(result, idx)
+	}
+	_ = SortIndexesByName(result, desc)
+	return result
+}
+
+// SortIndexesMapBySequence converts index map to sorted slice by sequence
+func SortIndexesMapBySequence(indexes map[string]*Index, desc bool) []*Index {
+	result := make([]*Index, 0, len(indexes))
+	for _, idx := range indexes {
+		result = append(result, idx)
+	}
+	_ = SortIndexesBySequence(result, desc)
+	return result
+}
+
+// SortIndexesByName sorts indexes by name
+func SortIndexesByName(indexes []*Index, desc bool) error {
+	sort.SliceStable(indexes, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(indexes[i].Name), strings.ToLower(indexes[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// SortIndexesBySequence sorts indexes by sequence number
+func SortIndexesBySequence(indexes []*Index, desc bool) error {
+	sort.SliceStable(indexes, func(i, j int) bool {
+		if desc {
+			return indexes[i].Sequence > indexes[j].Sequence
+		}
+		return indexes[i].Sequence < indexes[j].Sequence
+	})
+	return nil
+}
+
+// Constraint Sorting
+
+// SortConstraintsMapByName converts constraint map to sorted slice by name
+func SortConstraintsMapByName(constraints map[string]*Constraint, desc bool) []*Constraint {
+	result := make([]*Constraint, 0, len(constraints))
+	for _, c := range constraints {
+		result = append(result, c)
+	}
+	_ = SortConstraintsByName(result, desc)
+	return result
+}
+
+// SortConstraintsByName sorts constraints by name
+func SortConstraintsByName(constraints []*Constraint, desc bool) error {
+	sort.SliceStable(constraints, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(constraints[i].Name), strings.ToLower(constraints[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// Relationship Sorting
+
+// SortRelationshipsMapByName converts relationship map to sorted slice by name
+func SortRelationshipsMapByName(relationships map[string]*Relationship, desc bool) []*Relationship {
+	result := make([]*Relationship, 0, len(relationships))
+	for _, r := range relationships {
+		result = append(result, r)
+	}
+	_ = SortRelationshipsByName(result, desc)
+	return result
+}
+
+// SortRelationshipsByName sorts relationships by name
+func SortRelationshipsByName(relationships []*Relationship, desc bool) error {
+	sort.SliceStable(relationships, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(relationships[i].Name), strings.ToLower(relationships[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// Script Sorting
+
+// SortScriptsByName sorts scripts by name
+func SortScriptsByName(scripts []*Script, desc bool) error {
+	sort.SliceStable(scripts, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(scripts[i].Name), strings.ToLower(scripts[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}
+
+// Enum Sorting
+
+// SortEnumsByName sorts enums by name
+func SortEnumsByName(enums []*Enum, desc bool) error {
+	sort.SliceStable(enums, func(i, j int) bool {
+		cmp := strings.Compare(strings.ToLower(enums[i].Name), strings.ToLower(enums[j].Name))
+		if desc {
+			return cmp > 0
+		}
+		return cmp < 0
+	})
+	return nil
+}

pkg/mssql/README.md

@@ -0,0 +1,99 @@
+# MSSQL Package
+
+Provides utilities for working with Microsoft SQL Server data types and conversions.
+
+## Components
+
+### Type Mapping
+
+Provides bidirectional conversion between canonical types and MSSQL types:
+
+- **CanonicalToMSSQL**: Convert abstract types to MSSQL-specific types
+- **MSSQLToCanonical**: Convert MSSQL types to abstract representation
+
+## Type Conversion Tables
+
+### Canonical → MSSQL
+
+| Canonical | MSSQL | Notes |
+|-----------|-------|-------|
+| int | INT | 32-bit signed integer |
+| int64 | BIGINT | 64-bit signed integer |
+| int32 | INT | 32-bit signed integer |
+| int16 | SMALLINT | 16-bit signed integer |
+| int8 | TINYINT | 8-bit unsigned integer |
+| bool | BIT | 0 (false) or 1 (true) |
+| float32 | REAL | Single precision floating point |
+| float64 | FLOAT | Double precision floating point |
+| decimal | NUMERIC | Fixed-point decimal number |
+| string | NVARCHAR(255) | Unicode variable-length string |
+| text | NVARCHAR(MAX) | Unicode large text |
+| timestamp | DATETIME2 | Date and time without timezone |
+| timestamptz | DATETIMEOFFSET | Date and time with timezone offset |
+| uuid | UNIQUEIDENTIFIER | GUID/UUID type |
+| bytea | VARBINARY(MAX) | Variable-length binary data |
+| date | DATE | Date only |
+| time | TIME | Time only |
+| json | NVARCHAR(MAX) | Stored as text (MSSQL v2016+) |
+| jsonb | NVARCHAR(MAX) | Stored as text (MSSQL v2016+) |
+
+### MSSQL → Canonical
+
+| MSSQL | Canonical | Notes |
+|-------|-----------|-------|
+| INT, INTEGER | int | Standard integer |
+| BIGINT | int64 | Large integer |
+| SMALLINT | int16 | Small integer |
+| TINYINT | int8 | Tiny integer |
+| BIT | bool | Boolean/bit flag |
+| REAL | float32 | Single precision |
+| FLOAT | float64 | Double precision |
+| NUMERIC, DECIMAL | decimal | Exact decimal |
+| NVARCHAR, VARCHAR | string | Variable-length string |
+| NCHAR, CHAR | string | Fixed-length string |
+| DATETIME2 | timestamp | Default timestamp |
+| DATETIMEOFFSET | timestamptz | Timestamp with timezone |
+| DATE | date | Date only |
+| TIME | time | Time only |
+| UNIQUEIDENTIFIER | uuid | UUID/GUID |
+| VARBINARY, BINARY | bytea | Binary data |
+| XML | string | Stored as text |
+
+## Usage
+
+```go
+package main
+
+import (
+    "fmt"
+    "git.warky.dev/wdevs/relspecgo/pkg/mssql"
+)
+
+func main() {
+    // Convert canonical to MSSQL
+    mssqlType := mssql.ConvertCanonicalToMSSQL("int")
+    fmt.Println(mssqlType) // Output: INT
+
+    // Convert MSSQL to canonical
+    canonicalType := mssql.ConvertMSSQLToCanonical("BIGINT")
+    fmt.Println(canonicalType) // Output: int64
+
+    // Handle parameterized types
+    canonicalType = mssql.ConvertMSSQLToCanonical("NVARCHAR(255)")
+    fmt.Println(canonicalType) // Output: string
+}
+```
+
+## Testing
+
+Run tests with:
+```bash
+go test ./pkg/mssql/...
+```
+
+## Notes
+
+- Type conversions are case-insensitive
+- Parameterized types (e.g., `NVARCHAR(255)`) have their base type extracted
+- Unmapped types default to `string` for safety
+- The package supports SQL Server 2016 and later versions

pkg/mssql/datatypes.go

@@ -0,0 +1,114 @@
+package mssql
+
+import "strings"
+
+// CanonicalToMSSQLTypes maps canonical types to MSSQL types
+var CanonicalToMSSQLTypes = map[string]string{
+	"bool":        "BIT",
+	"int8":        "TINYINT",
+	"int16":       "SMALLINT",
+	"int":         "INT",
+	"int32":       "INT",
+	"int64":       "BIGINT",
+	"uint":        "BIGINT",
+	"uint8":       "SMALLINT",
+	"uint16":      "INT",
+	"uint32":      "BIGINT",
+	"uint64":      "BIGINT",
+	"float32":     "REAL",
+	"float64":     "FLOAT",
+	"decimal":     "NUMERIC",
+	"string":      "NVARCHAR(255)",
+	"text":        "NVARCHAR(MAX)",
+	"date":        "DATE",
+	"time":        "TIME",
+	"timestamp":   "DATETIME2",
+	"timestamptz": "DATETIMEOFFSET",
+	"uuid":        "UNIQUEIDENTIFIER",
+	"json":        "NVARCHAR(MAX)",
+	"jsonb":       "NVARCHAR(MAX)",
+	"bytea":       "VARBINARY(MAX)",
+}
+
+// MSSQLToCanonicalTypes maps MSSQL types to canonical types
+var MSSQLToCanonicalTypes = map[string]string{
+	"bit":              "bool",
+	"tinyint":          "int8",
+	"smallint":         "int16",
+	"int":              "int",
+	"integer":          "int",
+	"bigint":           "int64",
+	"real":             "float32",
+	"float":            "float64",
+	"numeric":          "decimal",
+	"decimal":          "decimal",
+	"money":            "decimal",
+	"smallmoney":       "decimal",
+	"nvarchar":         "string",
+	"nchar":            "string",
+	"varchar":          "string",
+	"char":             "string",
+	"text":             "string",
+	"ntext":            "string",
+	"date":             "date",
+	"time":             "time",
+	"datetime":         "timestamp",
+	"datetime2":        "timestamp",
+	"smalldatetime":    "timestamp",
+	"datetimeoffset":   "timestamptz",
+	"uniqueidentifier": "uuid",
+	"varbinary":        "bytea",
+	"binary":           "bytea",
+	"image":            "bytea",
+	"xml":              "string",
+	"json":             "json",
+	"sql_variant":      "string",
+	"hierarchyid":      "string",
+	"geography":        "string",
+	"geometry":         "string",
+}
+
+// ConvertCanonicalToMSSQL converts a canonical type to MSSQL type
+func ConvertCanonicalToMSSQL(canonicalType string) string {
+	// Check direct mapping
+	if mssqlType, exists := CanonicalToMSSQLTypes[strings.ToLower(canonicalType)]; exists {
+		return mssqlType
+	}
+
+	// Try to find by prefix
+	lowerType := strings.ToLower(canonicalType)
+	for canonical, mssql := range CanonicalToMSSQLTypes {
+		if strings.HasPrefix(lowerType, canonical) {
+			return mssql
+		}
+	}
+
+	// Default to NVARCHAR
+	return "NVARCHAR(255)"
+}
+
+// ConvertMSSQLToCanonical converts an MSSQL type to canonical type
+func ConvertMSSQLToCanonical(mssqlType string) string {
+	// Extract base type (remove parentheses and parameters)
+	baseType := mssqlType
+	if idx := strings.Index(baseType, "("); idx != -1 {
+		baseType = baseType[:idx]
+	}
+	baseType = strings.TrimSpace(baseType)
+
+	// Check direct mapping
+	if canonicalType, exists := MSSQLToCanonicalTypes[strings.ToLower(baseType)]; exists {
+		return canonicalType
+	}
+
+	// Try to find by prefix
+	lowerType := strings.ToLower(baseType)
+	for mssql, canonical := range MSSQLToCanonicalTypes {
+		if strings.HasPrefix(lowerType, mssql) {
+			return canonical
+		}
+	}
+
+	// Default to string
+	return "string"
+}

pkg/pgsql/datatypes.go

@@ -4,31 +4,31 @@ import "strings"
 
 var GoToStdTypes = map[string]string{
 	"bool":            "boolean",
-	"int64":           "integer",
+	"int64":           "bigint",
 	"int":             "integer",
-	"int8":            "integer",
-	"int16":           "integer",
+	"int8":            "smallint",
+	"int16":           "smallint",
 	"int32":           "integer",
 	"uint":            "integer",
-	"uint8":           "integer",
-	"uint16":          "integer",
+	"uint8":           "smallint",
+	"uint16":          "smallint",
 	"uint32":          "integer",
-	"uint64":          "integer",
-	"uintptr":         "integer",
-	"znullint64":      "integer",
+	"uint64":          "bigint",
+	"uintptr":         "bigint",
+	"znullint64":      "bigint",
 	"znullint32":      "integer",
-	"znullbyte":       "integer",
+	"znullbyte":       "smallint",
 	"float64":         "double",
 	"float32":         "double",
 	"complex64":       "double",
 	"complex128":      "double",
 	"customfloat64":   "double",
-	"string":          "string",
-	"Pointer":         "integer",
+	"string":          "text",
+	"Pointer":         "bigint",
 	"[]byte":          "blob",
-	"customdate":      "string",
-	"customtime":      "string",
-	"customtimestamp": "string",
+	"customdate":      "date",
+	"customtime":      "time",
+	"customtimestamp": "timestamp",
 	"sqlfloat64":      "double",
 	"sqlfloat16":      "double",
 	"sqluuid":         "uuid",
@@ -36,9 +36,9 @@ var GoToStdTypes = map[string]string{
 	"sqljson":         "json",
 	"sqlint64":        "bigint",
 	"sqlint32":        "integer",
-	"sqlint16":        "integer",
+	"sqlint16":        "smallint",
 	"sqlbool":         "boolean",
-	"sqlstring":       "string",
+	"sqlstring":       "text",
 	"nullablejsonb":   "jsonb",
 	"nullablejson":    "json",
 	"nullableuuid":    "uuid",
@@ -67,7 +67,7 @@ var GoToPGSQLTypes = map[string]string{
 	"float32":         "real",
 	"complex64":       "double precision",
 	"complex128":      "double precision",
-	"customfloat64":   "double precisio",
+	"customfloat64":   "double precision",
 	"string":          "text",
 	"Pointer":         "bigint",
 	"[]byte":          "bytea",
@@ -81,9 +81,9 @@ var GoToPGSQLTypes = map[string]string{
 	"sqljson":         "json",
 	"sqlint64":        "bigint",
 	"sqlint32":        "integer",
-	"sqlint16":        "integer",
+	"sqlint16":        "smallint",
 	"sqlbool":         "boolean",
-	"sqlstring":       "string",
+	"sqlstring":       "text",
 	"nullablejsonb":   "jsonb",
 	"nullablejson":    "json",
 	"nullableuuid":    "uuid",

pkg/pgsql/datatypes_test.go

@@ -0,0 +1,339 @@
+package pgsql
+
+import (
+	"testing"
+)
+
+func TestValidSQLType(t *testing.T) {
+	tests := []struct {
+		name    string
+		sqltype string
+		want    bool
+	}{
+		// PostgreSQL types
+		{"Valid PGSQL bigint", "bigint", true},
+		{"Valid PGSQL integer", "integer", true},
+		{"Valid PGSQL text", "text", true},
+		{"Valid PGSQL boolean", "boolean", true},
+		{"Valid PGSQL double precision", "double precision", true},
+		{"Valid PGSQL bytea", "bytea", true},
+		{"Valid PGSQL uuid", "uuid", true},
+		{"Valid PGSQL jsonb", "jsonb", true},
+		{"Valid PGSQL json", "json", true},
+		{"Valid PGSQL timestamp", "timestamp", true},
+		{"Valid PGSQL date", "date", true},
+		{"Valid PGSQL time", "time", true},
+		{"Valid PGSQL citext", "citext", true},
+
+		// Standard types
+		{"Valid std double", "double", true},
+		{"Valid std blob", "blob", true},
+
+		// Case insensitive
+		{"Case insensitive BIGINT", "BIGINT", true},
+		{"Case insensitive TeXt", "TeXt", true},
+		{"Case insensitive BoOlEaN", "BoOlEaN", true},
+
+		// Invalid types
+		{"Invalid type", "invalidtype", false},
+		{"Invalid type varchar", "varchar", false},
+		{"Empty string", "", false},
+		{"Random string", "foobar", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := ValidSQLType(tt.sqltype)
+			if got != tt.want {
+				t.Errorf("ValidSQLType(%q) = %v, want %v", tt.sqltype, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGetSQLType(t *testing.T) {
+	tests := []struct {
+		name    string
+		anytype string
+		want    string
+	}{
+		// Go types to PostgreSQL types
+		{"Go bool to boolean", "bool", "boolean"},
+		{"Go int64 to bigint", "int64", "bigint"},
+		{"Go int to integer", "int", "integer"},
+		{"Go string to text", "string", "text"},
+		{"Go float64 to double precision", "float64", "double precision"},
+		{"Go float32 to real", "float32", "real"},
+		{"Go []byte to bytea", "[]byte", "bytea"},
+
+		// SQL types remain SQL types
+		{"SQL bigint", "bigint", "bigint"},
+		{"SQL integer", "integer", "integer"},
+		{"SQL text", "text", "text"},
+		{"SQL boolean", "boolean", "boolean"},
+		{"SQL uuid", "uuid", "uuid"},
+		{"SQL jsonb", "jsonb", "jsonb"},
+
+		// Case insensitive Go types
+		{"Case insensitive BOOL", "BOOL", "boolean"},
+		{"Case insensitive InT64", "InT64", "bigint"},
+		{"Case insensitive STRING", "STRING", "text"},
+
+		// Case insensitive SQL types
+		{"Case insensitive BIGINT", "BIGINT", "bigint"},
+		{"Case insensitive TEXT", "TEXT", "text"},
+
+		// Custom types
+		{"Custom sqluuid", "sqluuid", "uuid"},
+		{"Custom sqljsonb", "sqljsonb", "jsonb"},
+		{"Custom sqlint64", "sqlint64", "bigint"},
+
+		// Unknown types default to text
+		{"Unknown type varchar", "varchar", "text"},
+		{"Unknown type foobar", "foobar", "text"},
+		{"Empty string", "", "text"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := GetSQLType(tt.anytype)
+			if got != tt.want {
+				t.Errorf("GetSQLType(%q) = %q, want %q", tt.anytype, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestConvertSQLType(t *testing.T) {
+	tests := []struct {
+		name    string
+		anytype string
+		want    string
+	}{
+		// Go types to PostgreSQL types
+		{"Go bool to boolean", "bool", "boolean"},
+		{"Go int64 to bigint", "int64", "bigint"},
+		{"Go int to integer", "int", "integer"},
+		{"Go string to text", "string", "text"},
+		{"Go float64 to double precision", "float64", "double precision"},
+		{"Go float32 to real", "float32", "real"},
+		{"Go []byte to bytea", "[]byte", "bytea"},
+
+		// SQL types remain SQL types
+		{"SQL bigint", "bigint", "bigint"},
+		{"SQL integer", "integer", "integer"},
+		{"SQL text", "text", "text"},
+		{"SQL boolean", "boolean", "boolean"},
+
+		// Case insensitive
+		{"Case insensitive BOOL", "BOOL", "boolean"},
+		{"Case insensitive InT64", "InT64", "bigint"},
+
+		// Unknown types remain unchanged (difference from GetSQLType)
+		{"Unknown type varchar", "varchar", "varchar"},
+		{"Unknown type foobar", "foobar", "foobar"},
+		{"Empty string", "", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := ConvertSQLType(tt.anytype)
+			if got != tt.want {
+				t.Errorf("ConvertSQLType(%q) = %q, want %q", tt.anytype, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsGoType(t *testing.T) {
+	tests := []struct {
+		name     string
+		typeName string
+		want     bool
+	}{
+		// Go basic types
+		{"Go bool", "bool", true},
+		{"Go int64", "int64", true},
+		{"Go int", "int", true},
+		{"Go int32", "int32", true},
+		{"Go int16", "int16", true},
+		{"Go int8", "int8", true},
+		{"Go uint", "uint", true},
+		{"Go uint64", "uint64", true},
+		{"Go uint32", "uint32", true},
+		{"Go uint16", "uint16", true},
+		{"Go uint8", "uint8", true},
+		{"Go float64", "float64", true},
+		{"Go float32", "float32", true},
+		{"Go string", "string", true},
+		{"Go []byte", "[]byte", true},
+
+		// Go custom types
+		{"Go complex64", "complex64", true},
+		{"Go complex128", "complex128", true},
+		{"Go uintptr", "uintptr", true},
+		{"Go Pointer", "Pointer", true},
+
+		// Custom SQL types
+		{"Custom sqluuid", "sqluuid", true},
+		{"Custom sqljsonb", "sqljsonb", true},
+		{"Custom sqlint64", "sqlint64", true},
+		{"Custom customdate", "customdate", true},
+		{"Custom customtime", "customtime", true},
+
+		// Case insensitive
+		{"Case insensitive BOOL", "BOOL", true},
+		{"Case insensitive InT64", "InT64", true},
+		{"Case insensitive STRING", "STRING", true},
+
+		// SQL types (not Go types)
+		{"SQL bigint", "bigint", false},
+		{"SQL integer", "integer", false},
+		{"SQL text", "text", false},
+		{"SQL boolean", "boolean", false},
+
+		// Invalid types
+		{"Invalid type", "invalidtype", false},
+		{"Empty string", "", false},
+		{"Random string", "foobar", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := IsGoType(tt.typeName)
+			if got != tt.want {
+				t.Errorf("IsGoType(%q) = %v, want %v", tt.typeName, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGetStdTypeFromGo(t *testing.T) {
+	tests := []struct {
+		name     string
+		typeName string
+		want     string
+	}{
+		// Go types to standard SQL types
+		{"Go bool to boolean", "bool", "boolean"},
+		{"Go int64 to bigint", "int64", "bigint"},
+		{"Go int to integer", "int", "integer"},
+		{"Go string to text", "string", "text"},
+		{"Go float64 to double", "float64", "double"},
+		{"Go float32 to double", "float32", "double"},
+		{"Go []byte to blob", "[]byte", "blob"},
+		{"Go int32 to integer", "int32", "integer"},
+		{"Go int16 to smallint", "int16", "smallint"},
+
+		// Custom types
+		{"Custom sqluuid to uuid", "sqluuid", "uuid"},
+		{"Custom sqljsonb to jsonb", "sqljsonb", "jsonb"},
+		{"Custom sqlint64 to bigint", "sqlint64", "bigint"},
+		{"Custom customdate to date", "customdate", "date"},
+
+		// Case insensitive
+		{"Case insensitive BOOL", "BOOL", "boolean"},
+		{"Case insensitive InT64", "InT64", "bigint"},
+		{"Case insensitive STRING", "STRING", "text"},
+
+		// Non-Go types remain unchanged
+		{"SQL bigint unchanged", "bigint", "bigint"},
+		{"SQL integer unchanged", "integer", "integer"},
+		{"Invalid type unchanged", "invalidtype", "invalidtype"},
+		{"Empty string unchanged", "", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := GetStdTypeFromGo(tt.typeName)
+			if got != tt.want {
+				t.Errorf("GetStdTypeFromGo(%q) = %q, want %q", tt.typeName, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGoToStdTypesMap(t *testing.T) {
+	// Test that the map contains expected entries
+	expectedMappings := map[string]string{
+		"bool":    "boolean",
+		"int64":   "bigint",
+		"int":     "integer",
+		"string":  "text",
+		"float64": "double",
+		"[]byte":  "blob",
+	}
+
+	for goType, expectedStd := range expectedMappings {
+		if stdType, ok := GoToStdTypes[goType]; !ok {
+			t.Errorf("GoToStdTypes missing entry for %q", goType)
+		} else if stdType != expectedStd {
+			t.Errorf("GoToStdTypes[%q] = %q, want %q", goType, stdType, expectedStd)
+		}
+	}
+
+	// Test that the map is not empty
+	if len(GoToStdTypes) == 0 {
+		t.Error("GoToStdTypes map is empty")
+	}
+}
+
+func TestGoToPGSQLTypesMap(t *testing.T) {
+	// Test that the map contains expected entries
+	expectedMappings := map[string]string{
+		"bool":    "boolean",
+		"int64":   "bigint",
+		"int":     "integer",
+		"string":  "text",
+		"float64": "double precision",
+		"float32": "real",
+		"[]byte":  "bytea",
+	}
+
+	for goType, expectedPG := range expectedMappings {
+		if pgType, ok := GoToPGSQLTypes[goType]; !ok {
+			t.Errorf("GoToPGSQLTypes missing entry for %q", goType)
+		} else if pgType != expectedPG {
+			t.Errorf("GoToPGSQLTypes[%q] = %q, want %q", goType, pgType, expectedPG)
+		}
+	}
+
+	// Test that the map is not empty
+	if len(GoToPGSQLTypes) == 0 {
+		t.Error("GoToPGSQLTypes map is empty")
+	}
+}
+
+func TestTypeConversionConsistency(t *testing.T) {
+	// Test that GetSQLType and ConvertSQLType are consistent for known types
+	knownGoTypes := []string{"bool", "int64", "int", "string", "float64", "[]byte"}
+
+	for _, goType := range knownGoTypes {
+		getSQLResult := GetSQLType(goType)
+		convertResult := ConvertSQLType(goType)
+
+		if getSQLResult != convertResult {
+			t.Errorf("Inconsistent results for %q: GetSQLType=%q, ConvertSQLType=%q",
+				goType, getSQLResult, convertResult)
+		}
+	}
+}
+
+func TestGetSQLTypeVsConvertSQLTypeDifference(t *testing.T) {
+	// Test that GetSQLType returns "text" for unknown types
+	// while ConvertSQLType returns the input unchanged
+	unknownTypes := []string{"varchar", "char", "customtype", "unknowntype"}
+
+	for _, unknown := range unknownTypes {
+		getSQLResult := GetSQLType(unknown)
+		convertResult := ConvertSQLType(unknown)
+
+		if getSQLResult != "text" {
+			t.Errorf("GetSQLType(%q) = %q, want %q", unknown, getSQLResult, "text")
+		}
+
+		if convertResult != unknown {
+			t.Errorf("ConvertSQLType(%q) = %q, want %q", unknown, convertResult, unknown)
+		}
+	}
+}

pkg/pgsql/doc.go

@@ -0,0 +1,36 @@
+// Package pgsql provides PostgreSQL-specific utilities and helpers.
+//
+// # Overview
+//
+// The pgsql package contains PostgreSQL-specific functionality including:
+//   - SQL reserved keyword validation
+//   - Data type mappings and conversions
+//   - PostgreSQL-specific schema introspection helpers
+//
+// # Components
+//
+// keywords.go - SQL reserved keywords validation
+//
+//	Provides functions to check if identifiers conflict with SQL reserved words
+//	and need quoting for safe usage in PostgreSQL queries.
+//
+// datatypes.go - PostgreSQL data type utilities
+//
+//	Contains mappings between PostgreSQL data types and their equivalents in other
+//	systems, as well as type conversion and normalization functions.
+//
+// # Usage
+//
+//	// Check if identifier needs quoting
+//	if pgsql.IsReservedKeyword("user") {
+//	    // Quote the identifier
+//	}
+//
+//	// Normalize data type
+//	normalizedType := pgsql.NormalizeDataType("varchar(255)")
+//
+// # Purpose
+//
+// This package supports the PostgreSQL reader and writer implementations by providing
+// shared utilities for handling PostgreSQL-specific schema elements and constraints.
+package pgsql

pkg/pgsql/keywords_test.go

@@ -0,0 +1,136 @@
+package pgsql
+
+import (
+	"testing"
+)
+
+func TestGetPostgresKeywords(t *testing.T) {
+	keywords := GetPostgresKeywords()
+
+	// Test that keywords are returned
+	if len(keywords) == 0 {
+		t.Fatal("Expected non-empty list of keywords")
+	}
+
+	// Test that we get all keywords from the map
+	expectedCount := len(postgresKeywords)
+	if len(keywords) != expectedCount {
+		t.Errorf("Expected %d keywords, got %d", expectedCount, len(keywords))
+	}
+
+	// Test that all returned keywords exist in the map
+	for _, keyword := range keywords {
+		if !postgresKeywords[keyword] {
+			t.Errorf("Keyword %q not found in postgresKeywords map", keyword)
+		}
+	}
+
+	// Test that no duplicate keywords are returned
+	seen := make(map[string]bool)
+	for _, keyword := range keywords {
+		if seen[keyword] {
+			t.Errorf("Duplicate keyword found: %q", keyword)
+		}
+		seen[keyword] = true
+	}
+}
+
+func TestPostgresKeywordsMap(t *testing.T) {
+	tests := []struct {
+		name    string
+		keyword string
+		want    bool
+	}{
+		{"SELECT keyword", "select", true},
+		{"FROM keyword", "from", true},
+		{"WHERE keyword", "where", true},
+		{"TABLE keyword", "table", true},
+		{"PRIMARY keyword", "primary", true},
+		{"FOREIGN keyword", "foreign", true},
+		{"CREATE keyword", "create", true},
+		{"DROP keyword", "drop", true},
+		{"ALTER keyword", "alter", true},
+		{"INDEX keyword", "index", true},
+		{"NOT keyword", "not", true},
+		{"NULL keyword", "null", true},
+		{"TRUE keyword", "true", true},
+		{"FALSE keyword", "false", true},
+		{"Non-keyword lowercase", "notakeyword", false},
+		{"Non-keyword uppercase", "NOTAKEYWORD", false},
+		{"Empty string", "", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := postgresKeywords[tt.keyword]
+			if got != tt.want {
+				t.Errorf("postgresKeywords[%q] = %v, want %v", tt.keyword, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestPostgresKeywordsMapContent(t *testing.T) {
+	// Test that the map contains expected common keywords
+	commonKeywords := []string{
+		"select", "insert", "update", "delete", "create", "drop", "alter",
+		"table", "index", "view", "schema", "function", "procedure",
+		"primary", "foreign", "key", "constraint", "unique", "check",
+		"null", "not", "and", "or", "like", "in", "between",
+		"join", "inner", "left", "right", "cross", "full", "outer",
+		"where", "having", "group", "order", "limit", "offset",
+		"union", "intersect", "except",
+		"begin", "commit", "rollback", "transaction",
+	}
+
+	for _, keyword := range commonKeywords {
+		if !postgresKeywords[keyword] {
+			t.Errorf("Expected common keyword %q to be in postgresKeywords map", keyword)
+		}
+	}
+}
+
+func TestPostgresKeywordsMapSize(t *testing.T) {
+	// PostgreSQL has a substantial list of reserved keywords
+	// This test ensures the map has a reasonable number of entries
+	minExpectedKeywords := 200 // PostgreSQL 13+ has 400+ reserved words
+
+	if len(postgresKeywords) < minExpectedKeywords {
+		t.Errorf("Expected at least %d keywords, got %d. The map may be incomplete.",
+			minExpectedKeywords, len(postgresKeywords))
+	}
+}
+
+func TestGetPostgresKeywordsConsistency(t *testing.T) {
+	// Test that calling GetPostgresKeywords multiple times returns consistent results
+	keywords1 := GetPostgresKeywords()
+	keywords2 := GetPostgresKeywords()
+
+	if len(keywords1) != len(keywords2) {
+		t.Errorf("Inconsistent results: first call returned %d keywords, second call returned %d",
+			len(keywords1), len(keywords2))
+	}
+
+	// Create a map from both results to compare
+	map1 := make(map[string]bool)
+	map2 := make(map[string]bool)
+
+	for _, k := range keywords1 {
+		map1[k] = true
+	}
+	for _, k := range keywords2 {
+		map2[k] = true
+	}
+
+	// Check that both contain the same keywords
+	for k := range map1 {
+		if !map2[k] {
+			t.Errorf("Keyword %q present in first call but not in second", k)
+		}
+	}
+	for k := range map2 {
+		if !map1[k] {
+			t.Errorf("Keyword %q present in second call but not in first", k)
+		}
+	}
+}

pkg/readers/bun/reader.go

@@ -632,6 +632,9 @@ func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, s
 		column.Name = parts[0]
 	}
 
+	// Track if we found explicit nullability markers
+	hasExplicitNullableMarker := false
+
 	// Parse tag attributes
 	for _, part := range parts[1:] {
 		kv := strings.SplitN(part, ":", 2)
@@ -649,6 +652,10 @@ func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, s
 			column.IsPrimaryKey = true
 		case "notnull":
 			column.NotNull = true
+			hasExplicitNullableMarker = true
+		case "nullzero":
+			column.NotNull = false
+			hasExplicitNullableMarker = true
 		case "autoincrement":
 			column.AutoIncrement = true
 		case "default":
@@ -664,17 +671,15 @@ func (r *Reader) parseColumn(fieldName string, fieldType ast.Expr, tag string, s
 
 	// Determine if nullable based on Go type and bun tags
 	// In Bun:
-	// - nullzero tag means the field is nullable (can be NULL in DB)
-	// - absence of nullzero means the field is NOT NULL
-	// - primitive types (int64, bool, string) are NOT NULL by default
-	column.NotNull = true
-	// Primary keys are always NOT NULL
-
-	if strings.Contains(bunTag, "nullzero") {
-		column.NotNull = false
-	} else {
+	// - explicit "notnull" tag means NOT NULL
+	// - explicit "nullzero" tag means nullable
+	// - absence of explicit markers: infer from Go type
+	if !hasExplicitNullableMarker {
+		// Infer from Go type if no explicit marker found
 		column.NotNull = !r.isNullableGoType(fieldType)
 	}
+
+	// Primary keys are always NOT NULL
 	if column.IsPrimaryKey {
 		column.NotNull = true
 	}

pkg/readers/dbml/reader.go

@@ -4,7 +4,9 @@ import (
 	"bufio"
 	"fmt"
 	"os"
+	"path/filepath"
 	"regexp"
+	"sort"
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
@@ -24,11 +26,23 @@ func NewReader(options *readers.ReaderOptions) *Reader {
 }
 
 // ReadDatabase reads and parses DBML input, returning a Database model
+// If FilePath points to a directory, all .dbml files are loaded and merged
 func (r *Reader) ReadDatabase() (*models.Database, error) {
 	if r.options.FilePath == "" {
 		return nil, fmt.Errorf("file path is required for DBML reader")
 	}
 
+	// Check if path is a directory
+	info, err := os.Stat(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to stat path: %w", err)
+	}
+
+	if info.IsDir() {
+		return r.readDirectoryDBML(r.options.FilePath)
+	}
+
+	// Single file - existing logic
 	content, err := os.ReadFile(r.options.FilePath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read file: %w", err)
@@ -67,15 +81,341 @@ func (r *Reader) ReadTable() (*models.Table, error) {
 	return schema.Tables[0], nil
 }
 
-// stripQuotes removes surrounding quotes from an identifier
+// readDirectoryDBML processes all .dbml files in directory
+// Returns merged Database model
+func (r *Reader) readDirectoryDBML(dirPath string) (*models.Database, error) {
+	// Discover and sort DBML files
+	files, err := r.discoverDBMLFiles(dirPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to discover DBML files: %w", err)
+	}
+
+	// If no files found, return empty database
+	if len(files) == 0 {
+		db := models.InitDatabase("database")
+		if r.options.Metadata != nil {
+			if name, ok := r.options.Metadata["name"].(string); ok {
+				db.Name = name
+			}
+		}
+		return db, nil
+	}
+
+	// Initialize database (will be merged with files)
+	var db *models.Database
+
+	// Process each file in sorted order
+	for _, filePath := range files {
+		content, err := os.ReadFile(filePath)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read file %s: %w", filePath, err)
+		}
+
+		fileDB, err := r.parseDBML(string(content))
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse file %s: %w", filePath, err)
+		}
+
+		// First file initializes the database
+		if db == nil {
+			db = fileDB
+		} else {
+			// Subsequent files are merged
+			mergeDatabase(db, fileDB)
+		}
+	}
+
+	return db, nil
+}
+
+// splitIdentifier splits a dotted identifier while respecting quotes
+// Handles cases like: "schema.with.dots"."table"."column"
+func splitIdentifier(s string) []string {
+	var parts []string
+	var current strings.Builder
+	inQuote := false
+	quoteChar := byte(0)
+
+	for i := 0; i < len(s); i++ {
+		ch := s[i]
+
+		if !inQuote {
+			switch ch {
+			case '"', '\'':
+				inQuote = true
+				quoteChar = ch
+				current.WriteByte(ch)
+			case '.':
+				if current.Len() > 0 {
+					parts = append(parts, current.String())
+					current.Reset()
+				}
+			default:
+				current.WriteByte(ch)
+			}
+		} else {
+			current.WriteByte(ch)
+			if ch == quoteChar {
+				inQuote = false
+			}
+		}
+	}
+
+	if current.Len() > 0 {
+		parts = append(parts, current.String())
+	}
+
+	return parts
+}
+
+// stripQuotes removes surrounding quotes and comments from an identifier
 func stripQuotes(s string) string {
 	s = strings.TrimSpace(s)
+
+	// Remove DBML comments in brackets (e.g., [note: 'description'])
+	// This handles inline comments like: "table_name" [note: 'comment']
+	commentRegex := regexp.MustCompile(`\s*\[.*?\]\s*`)
+	s = commentRegex.ReplaceAllString(s, "")
+
+	// Trim again after removing comments
+	s = strings.TrimSpace(s)
+
+	// Remove surrounding quotes (double or single)
 	if len(s) >= 2 && ((s[0] == '"' && s[len(s)-1] == '"') || (s[0] == '\'' && s[len(s)-1] == '\'')) {
 		return s[1 : len(s)-1]
 	}
 	return s
 }
 
+// parseFilePrefix extracts numeric prefix from filename
+// Examples: "1_schema.dbml" -> (1, true), "tables.dbml" -> (0, false)
+func parseFilePrefix(filename string) (int, bool) {
+	base := filepath.Base(filename)
+	re := regexp.MustCompile(`^(\d+)[_-]`)
+	matches := re.FindStringSubmatch(base)
+	if len(matches) > 1 {
+		var prefix int
+		_, err := fmt.Sscanf(matches[1], "%d", &prefix)
+		if err == nil {
+			return prefix, true
+		}
+	}
+	return 0, false
+}
+
+// hasCommentedRefs scans file content for commented-out Ref statements
+// Returns true if file contains lines like: // Ref: table.col > other.col
+func hasCommentedRefs(filePath string) (bool, error) {
+	content, err := os.ReadFile(filePath)
+	if err != nil {
+		return false, err
+	}
+
+	scanner := bufio.NewScanner(strings.NewReader(string(content)))
+	commentedRefRegex := regexp.MustCompile(`^\s*//.*Ref:\s+`)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if commentedRefRegex.MatchString(line) {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+// discoverDBMLFiles finds all .dbml files in directory and returns them sorted
+func (r *Reader) discoverDBMLFiles(dirPath string) ([]string, error) {
+	pattern := filepath.Join(dirPath, "*.dbml")
+	files, err := filepath.Glob(pattern)
+	if err != nil {
+		return nil, fmt.Errorf("failed to glob .dbml files: %w", err)
+	}
+
+	return sortDBMLFiles(files), nil
+}
+
+// sortDBMLFiles sorts files by:
+// 1. Files without commented refs (by numeric prefix, then alphabetically)
+// 2. Files with commented refs (by numeric prefix, then alphabetically)
+func sortDBMLFiles(files []string) []string {
+	// Create a slice to hold file info for sorting
+	type fileInfo struct {
+		path         string
+		hasCommented bool
+		prefix       int
+		hasPrefix    bool
+		basename     string
+	}
+
+	fileInfos := make([]fileInfo, 0, len(files))
+
+	for _, file := range files {
+		hasCommented, err := hasCommentedRefs(file)
+		if err != nil {
+			// If we can't read the file, treat it as not having commented refs
+			hasCommented = false
+		}
+
+		prefix, hasPrefix := parseFilePrefix(file)
+		basename := filepath.Base(file)
+
+		fileInfos = append(fileInfos, fileInfo{
+			path:         file,
+			hasCommented: hasCommented,
+			prefix:       prefix,
+			hasPrefix:    hasPrefix,
+			basename:     basename,
+		})
+	}
+
+	// Sort by: hasCommented (false first), hasPrefix (true first), prefix, basename
+	sort.Slice(fileInfos, func(i, j int) bool {
+		// First, sort by commented refs (files without commented refs come first)
+		if fileInfos[i].hasCommented != fileInfos[j].hasCommented {
+			return !fileInfos[i].hasCommented
+		}
+
+		// Then by presence of prefix (files with prefix come first)
+		if fileInfos[i].hasPrefix != fileInfos[j].hasPrefix {
+			return fileInfos[i].hasPrefix
+		}
+
+		// If both have prefix, sort by prefix value
+		if fileInfos[i].hasPrefix && fileInfos[j].hasPrefix {
+			if fileInfos[i].prefix != fileInfos[j].prefix {
+				return fileInfos[i].prefix < fileInfos[j].prefix
+			}
+		}
+
+		// Finally, sort alphabetically by basename
+		return fileInfos[i].basename < fileInfos[j].basename
+	})
+
+	// Extract sorted paths
+	sortedFiles := make([]string, len(fileInfos))
+	for i, info := range fileInfos {
+		sortedFiles[i] = info.path
+	}
+
+	return sortedFiles
+}
+
+// mergeTable combines two table definitions
+// Merges: Columns (map), Constraints (map), Indexes (map), Relationships (map)
+// Uses first non-empty Description
+func mergeTable(baseTable, fileTable *models.Table) {
+	// Merge columns (map naturally merges - later keys overwrite)
+	for key, col := range fileTable.Columns {
+		baseTable.Columns[key] = col
+	}
+
+	// Merge constraints
+	for key, constraint := range fileTable.Constraints {
+		baseTable.Constraints[key] = constraint
+	}
+
+	// Merge indexes
+	for key, index := range fileTable.Indexes {
+		baseTable.Indexes[key] = index
+	}
+
+	// Merge relationships
+	for key, rel := range fileTable.Relationships {
+		baseTable.Relationships[key] = rel
+	}
+
+	// Use first non-empty description
+	if baseTable.Description == "" && fileTable.Description != "" {
+		baseTable.Description = fileTable.Description
+	}
+
+	// Merge metadata maps
+	if baseTable.Metadata == nil {
+		baseTable.Metadata = make(map[string]any)
+	}
+	for key, val := range fileTable.Metadata {
+		baseTable.Metadata[key] = val
+	}
+}
+
+// mergeSchema finds or creates schema and merges tables
+func mergeSchema(baseDB *models.Database, fileSchema *models.Schema) {
+	// Find existing schema by name (normalize names by stripping quotes)
+	var existingSchema *models.Schema
+	fileSchemaName := stripQuotes(fileSchema.Name)
+	for _, schema := range baseDB.Schemas {
+		if stripQuotes(schema.Name) == fileSchemaName {
+			existingSchema = schema
+			break
+		}
+	}
+
+	// If schema doesn't exist, add it and return
+	if existingSchema == nil {
+		baseDB.Schemas = append(baseDB.Schemas, fileSchema)
+		return
+	}
+
+	// Merge tables from fileSchema into existingSchema
+	for _, fileTable := range fileSchema.Tables {
+		// Find existing table by name (normalize names by stripping quotes)
+		var existingTable *models.Table
+		fileTableName := stripQuotes(fileTable.Name)
+		for _, table := range existingSchema.Tables {
+			if stripQuotes(table.Name) == fileTableName {
+				existingTable = table
+				break
+			}
+		}
+
+		// If table doesn't exist, add it
+		if existingTable == nil {
+			existingSchema.Tables = append(existingSchema.Tables, fileTable)
+		} else {
+			// Merge table properties - tables are identical, skip
+			mergeTable(existingTable, fileTable)
+		}
+	}
+
+	// Merge other schema properties
+	existingSchema.Views = append(existingSchema.Views, fileSchema.Views...)
+	existingSchema.Sequences = append(existingSchema.Sequences, fileSchema.Sequences...)
+	existingSchema.Scripts = append(existingSchema.Scripts, fileSchema.Scripts...)
+
+	// Merge permissions
+	if existingSchema.Permissions == nil {
+		existingSchema.Permissions = make(map[string]string)
+	}
+	for key, val := range fileSchema.Permissions {
+		existingSchema.Permissions[key] = val
+	}
+
+	// Merge metadata
+	if existingSchema.Metadata == nil {
+		existingSchema.Metadata = make(map[string]any)
+	}
+	for key, val := range fileSchema.Metadata {
+		existingSchema.Metadata[key] = val
+	}
+}
+
+// mergeDatabase merges schemas from fileDB into baseDB
+func mergeDatabase(baseDB, fileDB *models.Database) {
+	// Merge each schema from fileDB
+	for _, fileSchema := range fileDB.Schemas {
+		mergeSchema(baseDB, fileSchema)
+	}
+
+	// Merge domains
+	baseDB.Domains = append(baseDB.Domains, fileDB.Domains...)
+
+	// Use first non-empty description
+	if baseDB.Description == "" && fileDB.Description != "" {
+		baseDB.Description = fileDB.Description
+	}
+}
+
 // parseDBML parses DBML content and returns a Database model
 func (r *Reader) parseDBML(content string) (*models.Database, error) {
 	db := models.InitDatabase("database")
@@ -109,7 +449,9 @@ func (r *Reader) parseDBML(content string) (*models.Database, error) {
 		// Parse Table definition
 		if matches := tableRegex.FindStringSubmatch(line); matches != nil {
 			tableName := matches[1]
-			parts := strings.Split(tableName, ".")
+			// Strip comments/notes before parsing to avoid dots in notes
+			tableName = strings.TrimSpace(regexp.MustCompile(`\s*\[.*?\]\s*`).ReplaceAllString(tableName, ""))
+			parts := splitIdentifier(tableName)
 
 			if len(parts) == 2 {
 				currentSchema = stripQuotes(parts[0])
@@ -261,8 +603,10 @@ func (r *Reader) parseColumn(line, tableName, schemaName string) (*models.Column
 					column.Default = strings.Trim(defaultVal, "'\"")
 				} else if attr == "unique" {
 					// Create a unique constraint
+					// Clean table name by removing leading underscores to avoid double underscores
+					cleanTableName := strings.TrimLeft(tableName, "_")
 					uniqueConstraint := models.InitConstraint(
-						fmt.Sprintf("uq_%s", columnName),
+						fmt.Sprintf("ukey_%s_%s", cleanTableName, columnName),
 						models.UniqueConstraint,
 					)
 					uniqueConstraint.Schema = schemaName
@@ -287,10 +631,10 @@ func (r *Reader) parseColumn(line, tableName, schemaName string) (*models.Column
 					refOp := strings.TrimSpace(refStr)
 					var isReverse bool
 					if strings.HasPrefix(refOp, "<") {
-						isReverse = column.IsPrimaryKey // < on PK means "is referenced by" (reverse)
-					} else if strings.HasPrefix(refOp, ">") {
-						isReverse = !column.IsPrimaryKey // > on FK means reverse
+						// < means "is referenced by" - only makes sense on PK columns
+						isReverse = column.IsPrimaryKey
 					}
+					// > means "references" - always a forward FK, never reverse
 
 					constraint = r.parseRef(refStr)
 					if constraint != nil {
@@ -310,8 +654,8 @@ func (r *Reader) parseColumn(line, tableName, schemaName string) (*models.Column
 							constraint.Table = tableName
 							constraint.Columns = []string{columnName}
 						}
-						// Generate short constraint name based on the column
-						constraint.Name = fmt.Sprintf("fk_%s", constraint.Columns[0])
+						// Generate constraint name based on table and columns
+						constraint.Name = fmt.Sprintf("fk_%s_%s", constraint.Table, strings.Join(constraint.Columns, "_"))
 					}
 				}
 			}
@@ -332,27 +676,31 @@ func (r *Reader) parseIndex(line, tableName, schemaName string) *models.Index {
 	// Format: (columns) [attributes] OR columnname [attributes]
 	var columns []string
 
-	if strings.Contains(line, "(") && strings.Contains(line, ")") {
+	// Find the attributes section to avoid parsing parentheses in notes/attributes
+	attrStart := strings.Index(line, "[")
+	columnPart := line
+	if attrStart > 0 {
+		columnPart = line[:attrStart]
+	}
+
+	if strings.Contains(columnPart, "(") && strings.Contains(columnPart, ")") {
 		// Multi-column format: (col1, col2) [attributes]
-		colStart := strings.Index(line, "(")
-		colEnd := strings.Index(line, ")")
+		colStart := strings.Index(columnPart, "(")
+		colEnd := strings.Index(columnPart, ")")
 		if colStart >= colEnd {
 			return nil
 		}
 
-		columnsStr := line[colStart+1 : colEnd]
+		columnsStr := columnPart[colStart+1 : colEnd]
 		for _, col := range strings.Split(columnsStr, ",") {
 			columns = append(columns, stripQuotes(strings.TrimSpace(col)))
 		}
-	} else if strings.Contains(line, "[") {
+	} else if attrStart > 0 {
 		// Single column format: columnname [attributes]
 		// Extract column name before the bracket
-		idx := strings.Index(line, "[")
-		if idx > 0 {
-			colName := strings.TrimSpace(line[:idx])
-			if colName != "" {
-				columns = []string{stripQuotes(colName)}
-			}
+		colName := strings.TrimSpace(columnPart)
+		if colName != "" {
+			columns = []string{stripQuotes(colName)}
 		}
 	}
 
@@ -391,7 +739,11 @@ func (r *Reader) parseIndex(line, tableName, schemaName string) *models.Index {
 
 	// Generate name if not provided
 	if index.Name == "" {
-		index.Name = fmt.Sprintf("idx_%s_%s", tableName, strings.Join(columns, "_"))
+		prefix := "idx"
+		if index.Unique {
+			prefix = "uidx"
+		}
+		index.Name = fmt.Sprintf("%s_%s_%s", prefix, tableName, strings.Join(columns, "_"))
 	}
 
 	return index
@@ -451,10 +803,10 @@ func (r *Reader) parseRef(refStr string) *models.Constraint {
 		return nil
 	}
 
-	// Generate short constraint name based on the source column
-	constraintName := fmt.Sprintf("fk_%s_%s", fromTable, toTable)
-	if len(fromColumns) > 0 {
-		constraintName = fmt.Sprintf("fk_%s", fromColumns[0])
+	// Generate constraint name based on table and columns
+	constraintName := fmt.Sprintf("fk_%s_%s", fromTable, strings.Join(fromColumns, "_"))
+	if len(fromColumns) == 0 {
+		constraintName = fmt.Sprintf("fk_%s_%s", fromTable, toTable)
 	}
 
 	constraint := models.InitConstraint(
@@ -510,7 +862,7 @@ func (r *Reader) parseTableRef(ref string) (schema, table string, columns []stri
 	}
 
 	// Parse schema, table, and optionally column
-	parts := strings.Split(strings.TrimSpace(ref), ".")
+	parts := splitIdentifier(strings.TrimSpace(ref))
 	if len(parts) == 3 {
 		// Format: "schema"."table"."column"
 		schema = stripQuotes(parts[0])

pkg/readers/dbml/reader_test.go

@@ -1,6 +1,7 @@
 package dbml
 
 import (
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -517,3 +518,356 @@ func TestGetForeignKeys(t *testing.T) {
 		t.Error("Expected foreign key constraint type")
 	}
 }
+
+// Tests for multi-file directory loading
+
+func TestReadDirectory_MultipleFiles(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Should have public schema
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	var publicSchema *models.Schema
+	for _, schema := range db.Schemas {
+		if schema.Name == "public" {
+			publicSchema = schema
+			break
+		}
+	}
+
+	if publicSchema == nil {
+		t.Fatal("Public schema not found")
+	}
+
+	// Should have 3 tables: users, posts, comments
+	if len(publicSchema.Tables) != 3 {
+		t.Fatalf("Expected 3 tables, got %d", len(publicSchema.Tables))
+	}
+
+	// Find tables
+	var usersTable, postsTable, commentsTable *models.Table
+	for _, table := range publicSchema.Tables {
+		switch table.Name {
+		case "users":
+			usersTable = table
+		case "posts":
+			postsTable = table
+		case "comments":
+			commentsTable = table
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+	if postsTable == nil {
+		t.Fatal("Posts table not found")
+	}
+	if commentsTable == nil {
+		t.Fatal("Comments table not found")
+	}
+
+	// Verify users table has merged columns from 1_users.dbml and 3_add_columns.dbml
+	expectedUserColumns := []string{"id", "email", "name", "created_at"}
+	if len(usersTable.Columns) != len(expectedUserColumns) {
+		t.Errorf("Expected %d columns in users table, got %d", len(expectedUserColumns), len(usersTable.Columns))
+	}
+
+	for _, colName := range expectedUserColumns {
+		if _, exists := usersTable.Columns[colName]; !exists {
+			t.Errorf("Expected column '%s' in users table", colName)
+		}
+	}
+
+	// Verify posts table columns
+	expectedPostColumns := []string{"id", "user_id", "title", "content", "created_at"}
+	for _, colName := range expectedPostColumns {
+		if _, exists := postsTable.Columns[colName]; !exists {
+			t.Errorf("Expected column '%s' in posts table", colName)
+		}
+	}
+}
+
+func TestReadDirectory_TableMerging(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	// Find users table
+	var usersTable *models.Table
+	for _, schema := range db.Schemas {
+		for _, table := range schema.Tables {
+			if table.Name == "users" && schema.Name == "public" {
+				usersTable = table
+				break
+			}
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+
+	// Verify columns from file 1 (id, email)
+	if _, exists := usersTable.Columns["id"]; !exists {
+		t.Error("Column 'id' from 1_users.dbml not found")
+	}
+	if _, exists := usersTable.Columns["email"]; !exists {
+		t.Error("Column 'email' from 1_users.dbml not found")
+	}
+
+	// Verify columns from file 3 (name, created_at)
+	if _, exists := usersTable.Columns["name"]; !exists {
+		t.Error("Column 'name' from 3_add_columns.dbml not found")
+	}
+	if _, exists := usersTable.Columns["created_at"]; !exists {
+		t.Error("Column 'created_at' from 3_add_columns.dbml not found")
+	}
+
+	// Verify column properties from file 1
+	emailCol := usersTable.Columns["email"]
+	if !emailCol.NotNull {
+		t.Error("Email column should be not null (from 1_users.dbml)")
+	}
+	if emailCol.Type != "varchar(255)" {
+		t.Errorf("Expected email type 'varchar(255)', got '%s'", emailCol.Type)
+	}
+}
+
+func TestReadDirectory_CommentedRefsLast(t *testing.T) {
+	// This test verifies that files with commented refs are processed last
+	// by checking that the file discovery returns them in the correct order
+	dirPath := filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile")
+
+	opts := &readers.ReaderOptions{
+		FilePath: dirPath,
+	}
+
+	reader := NewReader(opts)
+	files, err := reader.discoverDBMLFiles(dirPath)
+	if err != nil {
+		t.Fatalf("discoverDBMLFiles() error = %v", err)
+	}
+
+	if len(files) < 2 {
+		t.Skip("Not enough files to test ordering")
+	}
+
+	// Check that 9_refs.dbml (which has commented refs) comes last
+	lastFile := filepath.Base(files[len(files)-1])
+	if lastFile != "9_refs.dbml" {
+		t.Errorf("Expected last file to be '9_refs.dbml' (has commented refs), got '%s'", lastFile)
+	}
+
+	// Check that numbered files without commented refs come first
+	firstFile := filepath.Base(files[0])
+	if firstFile != "1_users.dbml" {
+		t.Errorf("Expected first file to be '1_users.dbml', got '%s'", firstFile)
+	}
+}
+
+func TestReadDirectory_EmptyDirectory(t *testing.T) {
+	// Create a temporary empty directory
+	tmpDir := filepath.Join("..", "..", "..", "tests", "assets", "dbml", "empty_test_dir")
+	err := os.MkdirAll(tmpDir, 0755)
+	if err != nil {
+		t.Fatalf("Failed to create temp directory: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := &readers.ReaderOptions{
+		FilePath: tmpDir,
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() should not error on empty directory, got: %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Empty directory should return empty database
+	if len(db.Schemas) != 0 {
+		t.Errorf("Expected 0 schemas for empty directory, got %d", len(db.Schemas))
+	}
+}
+
+func TestReadDatabase_BackwardCompat(t *testing.T) {
+	// Test that single file loading still works
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "simple.dbml"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	if len(schema.Tables) != 1 {
+		t.Fatalf("Expected 1 table, got %d", len(schema.Tables))
+	}
+
+	table := schema.Tables[0]
+	if table.Name != "users" {
+		t.Errorf("Expected table name 'users', got '%s'", table.Name)
+	}
+}
+
+func TestParseFilePrefix(t *testing.T) {
+	tests := []struct {
+		filename   string
+		wantPrefix int
+		wantHas    bool
+	}{
+		{"1_schema.dbml", 1, true},
+		{"2_tables.dbml", 2, true},
+		{"10_relationships.dbml", 10, true},
+		{"99_data.dbml", 99, true},
+		{"schema.dbml", 0, false},
+		{"tables_no_prefix.dbml", 0, false},
+		{"/path/to/1_file.dbml", 1, true},
+		{"/path/to/file.dbml", 0, false},
+		{"1-file.dbml", 1, true},
+		{"2-another.dbml", 2, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.filename, func(t *testing.T) {
+			gotPrefix, gotHas := parseFilePrefix(tt.filename)
+			if gotPrefix != tt.wantPrefix {
+				t.Errorf("parseFilePrefix(%s) prefix = %d, want %d", tt.filename, gotPrefix, tt.wantPrefix)
+			}
+			if gotHas != tt.wantHas {
+				t.Errorf("parseFilePrefix(%s) hasPrefix = %v, want %v", tt.filename, gotHas, tt.wantHas)
+			}
+		})
+	}
+}
+
+func TestConstraintNaming(t *testing.T) {
+	// Test that constraints are named with proper prefixes
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "complex.dbml"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	// Find users table
+	var usersTable *models.Table
+	var postsTable *models.Table
+	for _, schema := range db.Schemas {
+		for _, table := range schema.Tables {
+			if table.Name == "users" {
+				usersTable = table
+			} else if table.Name == "posts" {
+				postsTable = table
+			}
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+	if postsTable == nil {
+		t.Fatal("Posts table not found")
+	}
+
+	// Test unique constraint naming: ukey_table_column
+	if _, exists := usersTable.Constraints["ukey_users_email"]; !exists {
+		t.Error("Expected unique constraint 'ukey_users_email' not found")
+		t.Logf("Available constraints: %v", getKeys(usersTable.Constraints))
+	}
+
+	if _, exists := postsTable.Constraints["ukey_posts_slug"]; !exists {
+		t.Error("Expected unique constraint 'ukey_posts_slug' not found")
+		t.Logf("Available constraints: %v", getKeys(postsTable.Constraints))
+	}
+
+	// Test foreign key naming: fk_table_column
+	if _, exists := postsTable.Constraints["fk_posts_user_id"]; !exists {
+		t.Error("Expected foreign key 'fk_posts_user_id' not found")
+		t.Logf("Available constraints: %v", getKeys(postsTable.Constraints))
+	}
+
+	// Test unique index naming: uidx_table_columns
+	if _, exists := postsTable.Indexes["uidx_posts_slug"]; !exists {
+		t.Error("Expected unique index 'uidx_posts_slug' not found")
+		t.Logf("Available indexes: %v", getKeys(postsTable.Indexes))
+	}
+
+	// Test regular index naming: idx_table_columns
+	if _, exists := postsTable.Indexes["idx_posts_user_id_published"]; !exists {
+		t.Error("Expected index 'idx_posts_user_id_published' not found")
+		t.Logf("Available indexes: %v", getKeys(postsTable.Indexes))
+	}
+}
+
+func getKeys[V any](m map[string]V) []string {
+	keys := make([]string, 0, len(m))
+	for k := range m {
+		keys = append(keys, k)
+	}
+	return keys
+}
+
+func TestHasCommentedRefs(t *testing.T) {
+	// Test with the actual multifile test fixtures
+	tests := []struct {
+		filename string
+		wantHas  bool
+	}{
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "1_users.dbml"), false},
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "2_posts.dbml"), false},
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "3_add_columns.dbml"), false},
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "9_refs.dbml"), true},
+	}
+
+	for _, tt := range tests {
+		t.Run(filepath.Base(tt.filename), func(t *testing.T) {
+			gotHas, err := hasCommentedRefs(tt.filename)
+			if err != nil {
+				t.Fatalf("hasCommentedRefs() error = %v", err)
+			}
+			if gotHas != tt.wantHas {
+				t.Errorf("hasCommentedRefs(%s) = %v, want %v", filepath.Base(tt.filename), gotHas, tt.wantHas)
+			}
+		})
+	}
+}

pkg/readers/dctx/reader.go

@@ -79,6 +79,8 @@ func (r *Reader) convertToDatabase(dctx *models.DCTXDictionary) (*models.Databas
 	db := models.InitDatabase(dbName)
 	schema := models.InitSchema("public")
 
+	// Note: DCTX doesn't have database GUID, but schema can use dictionary name if available
+
 	// Create GUID mappings for tables and keys
 	tableGuidMap := make(map[string]string)             // GUID -> table name
 	keyGuidMap := make(map[string]*models.DCTXKey)      // GUID -> key definition
@@ -162,6 +164,10 @@ func (r *Reader) convertTable(dctxTable *models.DCTXTable) (*models.Table, map[s
 	tableName := r.sanitizeName(dctxTable.Name)
 	table := models.InitTable(tableName, "public")
 	table.Description = dctxTable.Description
+	// Assign GUID from DCTX table
+	if dctxTable.Guid != "" {
+		table.GUID = dctxTable.Guid
+	}
 
 	fieldGuidMap := make(map[string]string)
 
@@ -202,6 +208,10 @@ func (r *Reader) convertField(dctxField *models.DCTXField, tableName string) ([]
 
 	// Convert single field
 	column := models.InitColumn(r.sanitizeName(dctxField.Name), tableName, "public")
+	// Assign GUID from DCTX field
+	if dctxField.Guid != "" {
+		column.GUID = dctxField.Guid
+	}
 
 	// Map Clarion data types
 	dataType, length := r.mapDataType(dctxField.DataType, dctxField.Size)
@@ -346,6 +356,10 @@ func (r *Reader) convertKey(dctxKey *models.DCTXKey, table *models.Table, fieldG
 		constraint.Table = table.Name
 		constraint.Schema = table.Schema
 		constraint.Columns = columns
+		// Assign GUID from DCTX key
+		if dctxKey.Guid != "" {
+			constraint.GUID = dctxKey.Guid
+		}
 
 		table.Constraints[constraint.Name] = constraint
 
@@ -366,6 +380,10 @@ func (r *Reader) convertKey(dctxKey *models.DCTXKey, table *models.Table, fieldG
 	index.Columns = columns
 	index.Unique = dctxKey.Unique
 	index.Type = "btree"
+	// Assign GUID from DCTX key
+	if dctxKey.Guid != "" {
+		index.GUID = dctxKey.Guid
+	}
 
 	table.Indexes[index.Name] = index
 	return nil
@@ -460,6 +478,10 @@ func (r *Reader) processRelations(dctx *models.DCTXDictionary, schema *models.Sc
 		constraint.ReferencedColumns = pkColumns
 		constraint.OnDelete = r.mapReferentialAction(relation.Delete)
 		constraint.OnUpdate = r.mapReferentialAction(relation.Update)
+		// Assign GUID from DCTX relation
+		if relation.Guid != "" {
+			constraint.GUID = relation.Guid
+		}
 
 		foreignTable.Constraints[fkName] = constraint
 
@@ -473,6 +495,10 @@ func (r *Reader) processRelations(dctx *models.DCTXDictionary, schema *models.Sc
 		relationship.ForeignKey = fkName
 		relationship.Properties["on_delete"] = constraint.OnDelete
 		relationship.Properties["on_update"] = constraint.OnUpdate
+		// Assign GUID from DCTX relation
+		if relation.Guid != "" {
+			relationship.GUID = relation.Guid
+		}
 
 		foreignTable.Relationships[relationshipName] = relationship
 	}

pkg/readers/doc.go

@@ -0,0 +1,53 @@
+// Package readers provides interfaces and implementations for reading database schemas
+// from various input formats and data sources.
+//
+// # Overview
+//
+// The readers package defines a common Reader interface that all format-specific readers
+// implement. This allows RelSpec to read database schemas from multiple sources including:
+//   - Live databases (PostgreSQL, SQLite)
+//   - Schema definition files (DBML, DCTX, DrawDB, GraphQL)
+//   - ORM model files (GORM, Bun, Drizzle, Prisma, TypeORM)
+//   - Data interchange formats (JSON, YAML)
+//
+// # Architecture
+//
+// Each reader implementation is located in its own subpackage (e.g., pkg/readers/dbml,
+// pkg/readers/pgsql) and implements the Reader interface, supporting three levels of
+// granularity:
+//   - ReadDatabase() - Read complete database with all schemas
+//   - ReadSchema() - Read single schema with all tables
+//   - ReadTable() - Read single table with all columns and metadata
+//
+// # Usage
+//
+// Readers are instantiated with ReaderOptions containing source-specific configuration:
+//
+//	// Read from file
+//	reader := dbml.NewReader(&readers.ReaderOptions{
+//	    FilePath: "schema.dbml",
+//	})
+//	db, err := reader.ReadDatabase()
+//
+//	// Read from database
+//	reader := pgsql.NewReader(&readers.ReaderOptions{
+//	    ConnectionString: "postgres://user:pass@localhost/mydb",
+//	})
+//	db, err := reader.ReadDatabase()
+//
+// # Supported Formats
+//
+//   - dbml: Database Markup Language files
+//   - dctx: DCTX schema files
+//   - drawdb: DrawDB JSON format
+//   - graphql: GraphQL schema definition language
+//   - json: JSON database schema
+//   - yaml: YAML database schema
+//   - gorm: Go GORM model structs
+//   - bun: Go Bun model structs
+//   - drizzle: TypeScript Drizzle ORM schemas
+//   - prisma: Prisma schema language
+//   - typeorm: TypeScript TypeORM entities
+//   - pgsql: PostgreSQL live database introspection
+//   - sqlite: SQLite database files
+package readers

pkg/readers/drawdb/reader.go

@@ -140,6 +140,32 @@ func (r *Reader) convertToDatabase(drawSchema *drawdb.DrawDBSchema) (*models.Dat
 		db.Schemas = append(db.Schemas, schema)
 	}
 
+	// Convert DrawDB subject areas to domains
+	for _, area := range drawSchema.SubjectAreas {
+		domain := models.InitDomain(area.Name)
+
+		// Find all tables that visually belong to this area
+		// A table belongs to an area if its position is within the area bounds
+		for _, drawTable := range drawSchema.Tables {
+			if drawTable.X >= area.X && drawTable.X <= (area.X+area.Width) &&
+				drawTable.Y >= area.Y && drawTable.Y <= (area.Y+area.Height) {
+
+				schemaName := drawTable.Schema
+				if schemaName == "" {
+					schemaName = "public"
+				}
+
+				domainTable := models.InitDomainTable(drawTable.Name, schemaName)
+				domain.Tables = append(domain.Tables, domainTable)
+			}
+		}
+
+		// Only add domain if it has tables
+		if len(domain.Tables) > 0 {
+			db.Domains = append(db.Domains, domain)
+		}
+	}
+
 	return db, nil
 }
 

pkg/readers/drizzle/reader.go

@@ -241,11 +241,9 @@ func (r *Reader) parsePgEnum(line string, matches []string) *models.Enum {
 		}
 	}
 
-	return &models.Enum{
-		Name:   enumName,
-		Values: values,
-		Schema: "public",
-	}
+	enum := models.InitEnum(enumName, "public")
+	enum.Values = values
+	return enum
 }
 
 // parseTableBlock parses a complete pgTable definition block

pkg/readers/graphql/reader.go

@@ -260,11 +260,7 @@ func (r *Reader) parseType(typeName string, lines []string, schema *models.Schem
 }
 
 func (r *Reader) parseEnum(enumName string, lines []string, schema *models.Schema) {
-	enum := &models.Enum{
-		Name:   enumName,
-		Schema: schema.Name,
-		Values: make([]string, 0),
-	}
+	enum := models.InitEnum(enumName, schema.Name)
 
 	for _, line := range lines {
 		trimmed := strings.TrimSpace(line)

pkg/readers/mssql/README.md

@@ -0,0 +1,91 @@
+# MSSQL Reader
+
+Reads database schema from Microsoft SQL Server databases using a live connection.
+
+## Features
+
+- **Live Connection**: Connects to MSSQL databases using the Microsoft ODBC driver
+- **Multi-Schema Support**: Reads multiple schemas with full support for user-defined schemas
+- **Comprehensive Metadata**: Reads tables, columns, constraints, indexes, and extended properties
+- **Type Mapping**: Converts MSSQL types to canonical types for cross-database compatibility
+- **Extended Properties**: Extracts table and column descriptions from MS_Description
+- **Identity Columns**: Maps IDENTITY columns to AutoIncrement
+- **Relationships**: Derives relationships from foreign key constraints
+
+## Connection String Format
+
+```
+sqlserver://[user[:password]@][host][:port][?query]
+```
+
+Examples:
+```
+sqlserver://sa:password@localhost/dbname
+sqlserver://user:pass@192.168.1.100:1433/production
+sqlserver://localhost/testdb?encrypt=disable
+```
+
+## Supported Constraints
+
+- Primary Keys
+- Foreign Keys (with ON DELETE and ON UPDATE actions)
+- Unique Constraints
+- Check Constraints
+
+## Type Mappings
+
+| MSSQL Type | Canonical Type |
+|------------|----------------|
+| INT | int |
+| BIGINT | int64 |
+| SMALLINT | int16 |
+| TINYINT | int8 |
+| BIT | bool |
+| REAL | float32 |
+| FLOAT | float64 |
+| NUMERIC, DECIMAL | decimal |
+| NVARCHAR, VARCHAR | string |
+| DATETIME2 | timestamp |
+| DATETIMEOFFSET | timestamptz |
+| UNIQUEIDENTIFIER | uuid |
+| VARBINARY | bytea |
+| DATE | date |
+| TIME | time |
+
+## Usage
+
+```go
+import "git.warky.dev/wdevs/relspecgo/pkg/readers/mssql"
+import "git.warky.dev/wdevs/relspecgo/pkg/readers"
+
+reader := mssql.NewReader(&readers.ReaderOptions{
+    ConnectionString: "sqlserver://sa:password@localhost/mydb",
+})
+
+db, err := reader.ReadDatabase()
+if err != nil {
+    panic(err)
+}
+
+// Process schema...
+for _, schema := range db.Schemas {
+    fmt.Printf("Schema: %s\n", schema.Name)
+    for _, table := range schema.Tables {
+        fmt.Printf("  Table: %s\n", table.Name)
+    }
+}
+```
+
+## Testing
+
+Run tests with:
+```bash
+go test ./pkg/readers/mssql/...
+```
+
+For integration testing with a live MSSQL database:
+```bash
+docker-compose up -d mssql
+go test -tags=integration ./pkg/readers/mssql/...
+docker-compose down
+```

pkg/readers/mssql/queries.go

@@ -0,0 +1,416 @@
+package mssql
+
+import (
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// querySchemas retrieves all user-defined schemas from the database
+func (r *Reader) querySchemas() ([]*models.Schema, error) {
+	query := `
+		SELECT s.name, ISNULL(ep.value, '') as description
+		FROM sys.schemas s
+		LEFT JOIN sys.extended_properties ep
+			ON ep.major_id = s.schema_id
+			AND ep.minor_id = 0
+			AND ep.class = 3
+			AND ep.name = 'MS_Description'
+		WHERE s.name NOT IN ('dbo', 'guest', 'INFORMATION_SCHEMA', 'sys')
+		ORDER BY s.name
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	schemas := make([]*models.Schema, 0)
+	for rows.Next() {
+		var name, description string
+
+		if err := rows.Scan(&name, &description); err != nil {
+			return nil, err
+		}
+
+		schema := models.InitSchema(name)
+		if description != "" {
+			schema.Description = description
+		}
+
+		schemas = append(schemas, schema)
+	}
+
+	// Always include dbo schema if it has tables
+	dboSchema := models.InitSchema("dbo")
+	schemas = append(schemas, dboSchema)
+
+	return schemas, rows.Err()
+}
+
+// queryTables retrieves all tables for a given schema
+func (r *Reader) queryTables(schemaName string) ([]*models.Table, error) {
+	query := `
+		SELECT t.table_schema, t.table_name, ISNULL(ep.value, '') as description
+		FROM information_schema.tables t
+		LEFT JOIN sys.extended_properties ep
+			ON ep.major_id = OBJECT_ID(QUOTENAME(t.table_schema) + '.' + QUOTENAME(t.table_name))
+			AND ep.minor_id = 0
+			AND ep.class = 1
+			AND ep.name = 'MS_Description'
+		WHERE t.table_schema = ? AND t.table_type = 'BASE TABLE'
+		ORDER BY t.table_name
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	tables := make([]*models.Table, 0)
+	for rows.Next() {
+		var schema, tableName, description string
+
+		if err := rows.Scan(&schema, &tableName, &description); err != nil {
+			return nil, err
+		}
+
+		table := models.InitTable(tableName, schema)
+		if description != "" {
+			table.Description = description
+		}
+
+		tables = append(tables, table)
+	}
+
+	return tables, rows.Err()
+}
+
+// queryColumns retrieves all columns for tables in a schema
+// Returns map[schema.table]map[columnName]*Column
+func (r *Reader) queryColumns(schemaName string) (map[string]map[string]*models.Column, error) {
+	query := `
+		SELECT
+			c.table_schema,
+			c.table_name,
+			c.column_name,
+			c.ordinal_position,
+			c.column_default,
+			c.is_nullable,
+			c.data_type,
+			c.character_maximum_length,
+			c.numeric_precision,
+			c.numeric_scale,
+			ISNULL(ep.value, '') as description,
+			COLUMNPROPERTY(OBJECT_ID(QUOTENAME(c.table_schema) + '.' + QUOTENAME(c.table_name)), c.column_name, 'IsIdentity') as is_identity
+		FROM information_schema.columns c
+		LEFT JOIN sys.extended_properties ep
+			ON ep.major_id = OBJECT_ID(QUOTENAME(c.table_schema) + '.' + QUOTENAME(c.table_name))
+			AND ep.minor_id = COLUMNPROPERTY(OBJECT_ID(QUOTENAME(c.table_schema) + '.' + QUOTENAME(c.table_name)), c.column_name, 'ColumnId')
+			AND ep.class = 1
+			AND ep.name = 'MS_Description'
+		WHERE c.table_schema = ?
+		ORDER BY c.table_schema, c.table_name, c.ordinal_position
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	columnsMap := make(map[string]map[string]*models.Column)
+
+	for rows.Next() {
+		var schema, tableName, columnName, isNullable, dataType, description string
+		var ordinalPosition int
+		var columnDefault, charMaxLength, numPrecision, numScale, isIdentity *int
+
+		if err := rows.Scan(&schema, &tableName, &columnName, &ordinalPosition, &columnDefault, &isNullable, &dataType, &charMaxLength, &numPrecision, &numScale, &description, &isIdentity); err != nil {
+			return nil, err
+		}
+
+		column := models.InitColumn(columnName, tableName, schema)
+		column.Type = r.mapDataType(dataType)
+		column.NotNull = (isNullable == "NO")
+		column.Sequence = uint(ordinalPosition)
+
+		if description != "" {
+			column.Description = description
+		}
+
+		// Check if this is an identity column (auto-increment)
+		if isIdentity != nil && *isIdentity == 1 {
+			column.AutoIncrement = true
+		}
+
+		if charMaxLength != nil && *charMaxLength > 0 {
+			column.Length = *charMaxLength
+		}
+
+		if numPrecision != nil && *numPrecision > 0 {
+			column.Precision = *numPrecision
+		}
+
+		if numScale != nil && *numScale > 0 {
+			column.Scale = *numScale
+		}
+
+		// Create table key
+		tableKey := schema + "." + tableName
+		if columnsMap[tableKey] == nil {
+			columnsMap[tableKey] = make(map[string]*models.Column)
+		}
+		columnsMap[tableKey][columnName] = column
+	}
+
+	return columnsMap, rows.Err()
+}
+
+// queryPrimaryKeys retrieves all primary key constraints for a schema
+// Returns map[schema.table]*Constraint
+func (r *Reader) queryPrimaryKeys(schemaName string) (map[string]*models.Constraint, error) {
+	query := `
+		SELECT
+			s.name as schema_name,
+			t.name as table_name,
+			i.name as constraint_name,
+			STRING_AGG(c.name, ',') WITHIN GROUP (ORDER BY ic.key_ordinal) as columns
+		FROM sys.tables t
+		INNER JOIN sys.indexes i ON t.object_id = i.object_id AND i.is_primary_key = 1
+		INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
+		INNER JOIN sys.index_columns ic ON i.object_id = ic.object_id AND i.index_id = ic.index_id
+		INNER JOIN sys.columns c ON t.object_id = c.object_id AND ic.column_id = c.column_id
+		WHERE s.name = ?
+		GROUP BY s.name, t.name, i.name
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	primaryKeys := make(map[string]*models.Constraint)
+
+	for rows.Next() {
+		var schema, tableName, constraintName, columnsStr string
+
+		if err := rows.Scan(&schema, &tableName, &constraintName, &columnsStr); err != nil {
+			return nil, err
+		}
+
+		columns := strings.Split(columnsStr, ",")
+
+		constraint := models.InitConstraint(constraintName, models.PrimaryKeyConstraint)
+		constraint.Schema = schema
+		constraint.Table = tableName
+		constraint.Columns = columns
+
+		tableKey := schema + "." + tableName
+		primaryKeys[tableKey] = constraint
+	}
+
+	return primaryKeys, rows.Err()
+}
+
+// queryForeignKeys retrieves all foreign key constraints for a schema
+// Returns map[schema.table][]*Constraint
+func (r *Reader) queryForeignKeys(schemaName string) (map[string][]*models.Constraint, error) {
+	query := `
+		SELECT
+			s.name as schema_name,
+			t.name as table_name,
+			fk.name as constraint_name,
+			rs.name as referenced_schema,
+			rt.name as referenced_table,
+			STRING_AGG(c.name, ',') WITHIN GROUP (ORDER BY fkc.constraint_column_id) as columns,
+			STRING_AGG(rc.name, ',') WITHIN GROUP (ORDER BY fkc.constraint_column_id) as referenced_columns,
+			fk.delete_referential_action_desc,
+			fk.update_referential_action_desc
+		FROM sys.foreign_keys fk
+		INNER JOIN sys.tables t ON fk.parent_object_id = t.object_id
+		INNER JOIN sys.tables rt ON fk.referenced_object_id = rt.object_id
+		INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
+		INNER JOIN sys.schemas rs ON rt.schema_id = rs.schema_id
+		INNER JOIN sys.foreign_key_columns fkc ON fk.object_id = fkc.constraint_object_id
+		INNER JOIN sys.columns c ON fkc.parent_object_id = c.object_id AND fkc.parent_column_id = c.column_id
+		INNER JOIN sys.columns rc ON fkc.referenced_object_id = rc.object_id AND fkc.referenced_column_id = rc.column_id
+		WHERE s.name = ?
+		GROUP BY s.name, t.name, fk.name, rs.name, rt.name, fk.delete_referential_action_desc, fk.update_referential_action_desc
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	foreignKeys := make(map[string][]*models.Constraint)
+
+	for rows.Next() {
+		var schema, tableName, constraintName, refSchema, refTable, columnsStr, refColumnsStr, deleteAction, updateAction string
+
+		if err := rows.Scan(&schema, &tableName, &constraintName, &refSchema, &refTable, &columnsStr, &refColumnsStr, &deleteAction, &updateAction); err != nil {
+			return nil, err
+		}
+
+		columns := strings.Split(columnsStr, ",")
+		refColumns := strings.Split(refColumnsStr, ",")
+
+		constraint := models.InitConstraint(constraintName, models.ForeignKeyConstraint)
+		constraint.Schema = schema
+		constraint.Table = tableName
+		constraint.Columns = columns
+		constraint.ReferencedSchema = refSchema
+		constraint.ReferencedTable = refTable
+		constraint.ReferencedColumns = refColumns
+		constraint.OnDelete = strings.ToUpper(deleteAction)
+		constraint.OnUpdate = strings.ToUpper(updateAction)
+
+		tableKey := schema + "." + tableName
+		foreignKeys[tableKey] = append(foreignKeys[tableKey], constraint)
+	}
+
+	return foreignKeys, rows.Err()
+}
+
+// queryUniqueConstraints retrieves all unique constraints for a schema
+// Returns map[schema.table][]*Constraint
+func (r *Reader) queryUniqueConstraints(schemaName string) (map[string][]*models.Constraint, error) {
+	query := `
+		SELECT
+			s.name as schema_name,
+			t.name as table_name,
+			i.name as constraint_name,
+			STRING_AGG(c.name, ',') WITHIN GROUP (ORDER BY ic.key_ordinal) as columns
+		FROM sys.tables t
+		INNER JOIN sys.indexes i ON t.object_id = i.object_id AND i.is_unique = 1 AND i.is_primary_key = 0
+		INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
+		INNER JOIN sys.index_columns ic ON i.object_id = ic.object_id AND i.index_id = ic.index_id
+		INNER JOIN sys.columns c ON t.object_id = c.object_id AND ic.column_id = c.column_id
+		WHERE s.name = ?
+		GROUP BY s.name, t.name, i.name
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	uniqueConstraints := make(map[string][]*models.Constraint)
+
+	for rows.Next() {
+		var schema, tableName, constraintName, columnsStr string
+
+		if err := rows.Scan(&schema, &tableName, &constraintName, &columnsStr); err != nil {
+			return nil, err
+		}
+
+		columns := strings.Split(columnsStr, ",")
+
+		constraint := models.InitConstraint(constraintName, models.UniqueConstraint)
+		constraint.Schema = schema
+		constraint.Table = tableName
+		constraint.Columns = columns
+
+		tableKey := schema + "." + tableName
+		uniqueConstraints[tableKey] = append(uniqueConstraints[tableKey], constraint)
+	}
+
+	return uniqueConstraints, rows.Err()
+}
+
+// queryCheckConstraints retrieves all check constraints for a schema
+// Returns map[schema.table][]*Constraint
+func (r *Reader) queryCheckConstraints(schemaName string) (map[string][]*models.Constraint, error) {
+	query := `
+		SELECT
+			s.name as schema_name,
+			t.name as table_name,
+			cc.name as constraint_name,
+			cc.definition
+		FROM sys.tables t
+		INNER JOIN sys.check_constraints cc ON t.object_id = cc.parent_object_id
+		INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
+		WHERE s.name = ?
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	checkConstraints := make(map[string][]*models.Constraint)
+
+	for rows.Next() {
+		var schema, tableName, constraintName, definition string
+
+		if err := rows.Scan(&schema, &tableName, &constraintName, &definition); err != nil {
+			return nil, err
+		}
+
+		constraint := models.InitConstraint(constraintName, models.CheckConstraint)
+		constraint.Schema = schema
+		constraint.Table = tableName
+		constraint.Expression = definition
+
+		tableKey := schema + "." + tableName
+		checkConstraints[tableKey] = append(checkConstraints[tableKey], constraint)
+	}
+
+	return checkConstraints, rows.Err()
+}
+
+// queryIndexes retrieves all indexes for a schema
+// Returns map[schema.table][]*Index
+func (r *Reader) queryIndexes(schemaName string) (map[string][]*models.Index, error) {
+	query := `
+		SELECT
+			s.name as schema_name,
+			t.name as table_name,
+			i.name as index_name,
+			i.is_unique,
+			STRING_AGG(c.name, ',') WITHIN GROUP (ORDER BY ic.key_ordinal) as columns
+		FROM sys.tables t
+		INNER JOIN sys.indexes i ON t.object_id = i.object_id AND i.is_primary_key = 0 AND i.name IS NOT NULL
+		INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
+		INNER JOIN sys.index_columns ic ON i.object_id = ic.object_id AND i.index_id = ic.index_id
+		INNER JOIN sys.columns c ON t.object_id = c.object_id AND ic.column_id = c.column_id
+		WHERE s.name = ?
+		GROUP BY s.name, t.name, i.name, i.is_unique
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query, schemaName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	indexes := make(map[string][]*models.Index)
+
+	for rows.Next() {
+		var schema, tableName, indexName, columnsStr string
+		var isUnique int
+
+		if err := rows.Scan(&schema, &tableName, &indexName, &isUnique, &columnsStr); err != nil {
+			return nil, err
+		}
+
+		columns := strings.Split(columnsStr, ",")
+
+		index := models.InitIndex(indexName, tableName, schema)
+		index.Columns = columns
+		index.Unique = (isUnique == 1)
+		index.Type = "btree" // MSSQL uses btree by default
+
+		tableKey := schema + "." + tableName
+		indexes[tableKey] = append(indexes[tableKey], index)
+	}
+
+	return indexes, rows.Err()
+}

pkg/readers/mssql/reader.go

@@ -0,0 +1,266 @@
+package mssql
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	_ "github.com/microsoft/go-mssqldb" // MSSQL driver
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/mssql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+// Reader implements the readers.Reader interface for MSSQL databases
+type Reader struct {
+	options *readers.ReaderOptions
+	db      *sql.DB
+	ctx     context.Context
+}
+
+// NewReader creates a new MSSQL reader
+func NewReader(options *readers.ReaderOptions) *Reader {
+	return &Reader{
+		options: options,
+		ctx:     context.Background(),
+	}
+}
+
+// ReadDatabase reads the entire database schema from MSSQL
+func (r *Reader) ReadDatabase() (*models.Database, error) {
+	// Validate connection string
+	if r.options.ConnectionString == "" {
+		return nil, fmt.Errorf("connection string is required")
+	}
+
+	// Connect to the database
+	if err := r.connect(); err != nil {
+		return nil, fmt.Errorf("failed to connect: %w", err)
+	}
+	defer r.close()
+
+	// Get database name
+	var dbName string
+	err := r.db.QueryRowContext(r.ctx, "SELECT DB_NAME()").Scan(&dbName)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get database name: %w", err)
+	}
+
+	// Initialize database model
+	db := models.InitDatabase(dbName)
+	db.DatabaseType = models.MSSQLDatabaseType
+	db.SourceFormat = "mssql"
+
+	// Get MSSQL version
+	var version string
+	err = r.db.QueryRowContext(r.ctx, "SELECT @@VERSION").Scan(&version)
+	if err == nil {
+		db.DatabaseVersion = version
+	}
+
+	// Query all schemas
+	schemas, err := r.querySchemas()
+	if err != nil {
+		return nil, fmt.Errorf("failed to query schemas: %w", err)
+	}
+
+	// Process each schema
+	for _, schema := range schemas {
+		// Query tables for this schema
+		tables, err := r.queryTables(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query tables for schema %s: %w", schema.Name, err)
+		}
+		schema.Tables = tables
+
+		// Query columns for tables
+		columnsMap, err := r.queryColumns(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query columns for schema %s: %w", schema.Name, err)
+		}
+
+		// Populate table columns
+		for _, table := range schema.Tables {
+			tableKey := schema.Name + "." + table.Name
+			if cols, exists := columnsMap[tableKey]; exists {
+				table.Columns = cols
+			}
+		}
+
+		// Query primary keys
+		primaryKeys, err := r.queryPrimaryKeys(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query primary keys for schema %s: %w", schema.Name, err)
+		}
+
+		// Apply primary keys to tables
+		for _, table := range schema.Tables {
+			tableKey := schema.Name + "." + table.Name
+			if pk, exists := primaryKeys[tableKey]; exists {
+				table.Constraints[pk.Name] = pk
+				// Mark columns as primary key and not null
+				for _, colName := range pk.Columns {
+					if col, colExists := table.Columns[colName]; colExists {
+						col.IsPrimaryKey = true
+						col.NotNull = true
+					}
+				}
+			}
+		}
+
+		// Query foreign keys
+		foreignKeys, err := r.queryForeignKeys(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query foreign keys for schema %s: %w", schema.Name, err)
+		}
+
+		// Apply foreign keys to tables
+		for _, table := range schema.Tables {
+			tableKey := schema.Name + "." + table.Name
+			if fks, exists := foreignKeys[tableKey]; exists {
+				for _, fk := range fks {
+					table.Constraints[fk.Name] = fk
+					// Derive relationship from foreign key
+					r.deriveRelationship(table, fk)
+				}
+			}
+		}
+
+		// Query unique constraints
+		uniqueConstraints, err := r.queryUniqueConstraints(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query unique constraints for schema %s: %w", schema.Name, err)
+		}
+
+		// Apply unique constraints to tables
+		for _, table := range schema.Tables {
+			tableKey := schema.Name + "." + table.Name
+			if ucs, exists := uniqueConstraints[tableKey]; exists {
+				for _, uc := range ucs {
+					table.Constraints[uc.Name] = uc
+				}
+			}
+		}
+
+		// Query check constraints
+		checkConstraints, err := r.queryCheckConstraints(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query check constraints for schema %s: %w", schema.Name, err)
+		}
+
+		// Apply check constraints to tables
+		for _, table := range schema.Tables {
+			tableKey := schema.Name + "." + table.Name
+			if ccs, exists := checkConstraints[tableKey]; exists {
+				for _, cc := range ccs {
+					table.Constraints[cc.Name] = cc
+				}
+			}
+		}
+
+		// Query indexes
+		indexes, err := r.queryIndexes(schema.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query indexes for schema %s: %w", schema.Name, err)
+		}
+
+		// Apply indexes to tables
+		for _, table := range schema.Tables {
+			tableKey := schema.Name + "." + table.Name
+			if idxs, exists := indexes[tableKey]; exists {
+				for _, idx := range idxs {
+					table.Indexes[idx.Name] = idx
+				}
+			}
+		}
+
+		// Set RefDatabase for schema
+		schema.RefDatabase = db
+
+		// Set RefSchema for tables
+		for _, table := range schema.Tables {
+			table.RefSchema = schema
+		}
+
+		// Add schema to database
+		db.Schemas = append(db.Schemas, schema)
+	}
+
+	return db, nil
+}
+
+// ReadSchema reads a single schema (returns the first schema from the database)
+func (r *Reader) ReadSchema() (*models.Schema, error) {
+	db, err := r.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+	if len(db.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas found in database")
+	}
+	return db.Schemas[0], nil
+}
+
+// ReadTable reads a single table (returns the first table from the first schema)
+func (r *Reader) ReadTable() (*models.Table, error) {
+	schema, err := r.ReadSchema()
+	if err != nil {
+		return nil, err
+	}
+	if len(schema.Tables) == 0 {
+		return nil, fmt.Errorf("no tables found in schema")
+	}
+	return schema.Tables[0], nil
+}
+
+// connect establishes a connection to the MSSQL database
+func (r *Reader) connect() error {
+	db, err := sql.Open("mssql", r.options.ConnectionString)
+	if err != nil {
+		return err
+	}
+
+	// Test connection
+	if err = db.PingContext(r.ctx); err != nil {
+		db.Close()
+		return err
+	}
+
+	r.db = db
+	return nil
+}
+
+// close closes the database connection
+func (r *Reader) close() {
+	if r.db != nil {
+		r.db.Close()
+	}
+}
+
+// mapDataType maps MSSQL data types to canonical types
+func (r *Reader) mapDataType(mssqlType string) string {
+	return mssql.ConvertMSSQLToCanonical(mssqlType)
+}
+
+// deriveRelationship creates a relationship from a foreign key constraint
+func (r *Reader) deriveRelationship(table *models.Table, fk *models.Constraint) {
+	relationshipName := fmt.Sprintf("%s_to_%s", table.Name, fk.ReferencedTable)
+
+	relationship := models.InitRelationship(relationshipName, models.OneToMany)
+	relationship.FromTable = table.Name
+	relationship.FromSchema = table.Schema
+	relationship.ToTable = fk.ReferencedTable
+	relationship.ToSchema = fk.ReferencedSchema
+	relationship.ForeignKey = fk.Name
+
+	// Store constraint actions in properties
+	if fk.OnDelete != "" {
+		relationship.Properties["on_delete"] = fk.OnDelete
+	}
+	if fk.OnUpdate != "" {
+		relationship.Properties["on_update"] = fk.OnUpdate
+	}
+
+	table.Relationships[relationshipName] = relationship
+}

pkg/readers/mssql/reader_test.go

@@ -0,0 +1,86 @@
+package mssql
+
+import (
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/mssql"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+	"github.com/stretchr/testify/assert"
+)
+
+// TestMapDataType tests MSSQL type mapping to canonical types
+func TestMapDataType(t *testing.T) {
+	reader := NewReader(&readers.ReaderOptions{})
+
+	tests := []struct {
+		name         string
+		mssqlType    string
+		expectedType string
+	}{
+		{"INT to int", "INT", "int"},
+		{"BIGINT to int64", "BIGINT", "int64"},
+		{"BIT to bool", "BIT", "bool"},
+		{"NVARCHAR to string", "NVARCHAR(255)", "string"},
+		{"DATETIME2 to timestamp", "DATETIME2", "timestamp"},
+		{"DATETIMEOFFSET to timestamptz", "DATETIMEOFFSET", "timestamptz"},
+		{"UNIQUEIDENTIFIER to uuid", "UNIQUEIDENTIFIER", "uuid"},
+		{"FLOAT to float64", "FLOAT", "float64"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := reader.mapDataType(tt.mssqlType)
+			assert.Equal(t, tt.expectedType, result)
+		})
+	}
+}
+
+// TestConvertCanonicalToMSSQL tests canonical to MSSQL type conversion
+func TestConvertCanonicalToMSSQL(t *testing.T) {
+	tests := []struct {
+		name           string
+		canonicalType  string
+		expectedMSSQL  string
+	}{
+		{"int to INT", "int", "INT"},
+		{"int64 to BIGINT", "int64", "BIGINT"},
+		{"bool to BIT", "bool", "BIT"},
+		{"string to NVARCHAR(255)", "string", "NVARCHAR(255)"},
+		{"text to NVARCHAR(MAX)", "text", "NVARCHAR(MAX)"},
+		{"timestamp to DATETIME2", "timestamp", "DATETIME2"},
+		{"timestamptz to DATETIMEOFFSET", "timestamptz", "DATETIMEOFFSET"},
+		{"uuid to UNIQUEIDENTIFIER", "uuid", "UNIQUEIDENTIFIER"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := mssql.ConvertCanonicalToMSSQL(tt.canonicalType)
+			assert.Equal(t, tt.expectedMSSQL, result)
+		})
+	}
+}
+
+// TestConvertMSSQLToCanonical tests MSSQL to canonical type conversion
+func TestConvertMSSQLToCanonical(t *testing.T) {
+	tests := []struct {
+		name           string
+		mssqlType      string
+		expectedType   string
+	}{
+		{"INT to int", "INT", "int"},
+		{"BIGINT to int64", "BIGINT", "int64"},
+		{"BIT to bool", "BIT", "bool"},
+		{"NVARCHAR with params", "NVARCHAR(255)", "string"},
+		{"DATETIME2 to timestamp", "DATETIME2", "timestamp"},
+		{"DATETIMEOFFSET to timestamptz", "DATETIMEOFFSET", "timestamptz"},
+		{"UNIQUEIDENTIFIER to uuid", "UNIQUEIDENTIFIER", "uuid"},
+		{"VARBINARY to bytea", "VARBINARY(MAX)", "bytea"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := mssql.ConvertMSSQLToCanonical(tt.mssqlType)
+			assert.Equal(t, tt.expectedType, result)
+		})
+	}
+}

pkg/readers/pgsql/queries.go

@@ -231,14 +231,13 @@ func (r *Reader) queryColumns(schemaName string) (map[string]map[string]*models.
 		}
 
 		column := models.InitColumn(columnName, tableName, schema)
-		column.Type = r.mapDataType(dataType, udtName)
-		column.NotNull = (isNullable == "NO")
-		column.Sequence = uint(ordinalPosition)
 
+		// Check if this is a serial type (has nextval default)
+		hasNextval := false
 		if columnDefault != nil {
-			// Parse default value - remove nextval for sequences
 			defaultVal := *columnDefault
 			if strings.HasPrefix(defaultVal, "nextval") {
+				hasNextval = true
 				column.AutoIncrement = true
 				column.Default = defaultVal
 			} else {
@@ -246,6 +245,11 @@ func (r *Reader) queryColumns(schemaName string) (map[string]map[string]*models.
 			}
 		}
 
+		// Map data type, preserving serial types when detected
+		column.Type = r.mapDataType(dataType, udtName, hasNextval)
+		column.NotNull = (isNullable == "NO")
+		column.Sequence = uint(ordinalPosition)
+
 		if description != nil {
 			column.Description = *description
 		}

pkg/readers/pgsql/reader.go

@@ -3,6 +3,7 @@ package pgsql
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/jackc/pgx/v5"
 
@@ -259,33 +260,46 @@ func (r *Reader) close() {
 }
 
 // mapDataType maps PostgreSQL data types to canonical types
-func (r *Reader) mapDataType(pgType, udtName string) string {
+func (r *Reader) mapDataType(pgType, udtName string, hasNextval bool) string {
+	// If the column has a nextval default, it's likely a serial type
+	// Map to the appropriate serial type instead of the base integer type
+	if hasNextval {
+		switch strings.ToLower(pgType) {
+		case "integer", "int", "int4":
+			return "serial"
+		case "bigint", "int8":
+			return "bigserial"
+		case "smallint", "int2":
+			return "smallserial"
+		}
+	}
+
 	// Map common PostgreSQL types
 	typeMap := map[string]string{
-		"integer":                     "int",
-		"bigint":                      "int64",
-		"smallint":                    "int16",
-		"int":                         "int",
-		"int2":                        "int16",
-		"int4":                        "int",
-		"int8":                        "int64",
-		"serial":                      "int",
-		"bigserial":                   "int64",
-		"smallserial":                 "int16",
-		"numeric":                     "decimal",
+		"integer":                     "integer",
+		"bigint":                      "bigint",
+		"smallint":                    "smallint",
+		"int":                         "integer",
+		"int2":                        "smallint",
+		"int4":                        "integer",
+		"int8":                        "bigint",
+		"serial":                      "serial",
+		"bigserial":                   "bigserial",
+		"smallserial":                 "smallserial",
+		"numeric":                     "numeric",
 		"decimal":                     "decimal",
-		"real":                        "float32",
-		"double precision":            "float64",
-		"float4":                      "float32",
-		"float8":                      "float64",
-		"money":                       "decimal",
-		"character varying":           "string",
-		"varchar":                     "string",
-		"character":                   "string",
-		"char":                        "string",
-		"text":                        "string",
-		"boolean":                     "bool",
-		"bool":                        "bool",
+		"real":                        "real",
+		"double precision":            "double precision",
+		"float4":                      "real",
+		"float8":                      "double precision",
+		"money":                       "money",
+		"character varying":           "varchar",
+		"varchar":                     "varchar",
+		"character":                   "char",
+		"char":                        "char",
+		"text":                        "text",
+		"boolean":                     "boolean",
+		"bool":                        "boolean",
 		"date":                        "date",
 		"time":                        "time",
 		"time without time zone":      "time",
@@ -329,10 +343,10 @@ func (r *Reader) deriveRelationship(table *models.Table, fk *models.Constraint)
 	relationshipName := fmt.Sprintf("%s_to_%s", table.Name, fk.ReferencedTable)
 
 	relationship := models.InitRelationship(relationshipName, models.OneToMany)
-	relationship.FromTable = fk.ReferencedTable
-	relationship.FromSchema = fk.ReferencedSchema
-	relationship.ToTable = table.Name
-	relationship.ToSchema = table.Schema
+	relationship.FromTable = table.Name
+	relationship.FromSchema = table.Schema
+	relationship.ToTable = fk.ReferencedTable
+	relationship.ToSchema = fk.ReferencedSchema
 	relationship.ForeignKey = fk.Name
 
 	// Store constraint actions in properties

pkg/readers/pgsql/reader_test.go

@@ -177,20 +177,20 @@ func TestMapDataType(t *testing.T) {
 		udtName  string
 		expected string
 	}{
-		{"integer", "int4", "int"},
-		{"bigint", "int8", "int64"},
-		{"smallint", "int2", "int16"},
-		{"character varying", "varchar", "string"},
-		{"text", "text", "string"},
-		{"boolean", "bool", "bool"},
+		{"integer", "int4", "integer"},
+		{"bigint", "int8", "bigint"},
+		{"smallint", "int2", "smallint"},
+		{"character varying", "varchar", "varchar"},
+		{"text", "text", "text"},
+		{"boolean", "bool", "boolean"},
 		{"timestamp without time zone", "timestamp", "timestamp"},
 		{"timestamp with time zone", "timestamptz", "timestamptz"},
 		{"json", "json", "json"},
 		{"jsonb", "jsonb", "jsonb"},
 		{"uuid", "uuid", "uuid"},
-		{"numeric", "numeric", "decimal"},
-		{"real", "float4", "float32"},
-		{"double precision", "float8", "float64"},
+		{"numeric", "numeric", "numeric"},
+		{"real", "float4", "real"},
+		{"double precision", "float8", "double precision"},
 		{"date", "date", "date"},
 		{"time without time zone", "time", "time"},
 		{"bytea", "bytea", "bytea"},
@@ -199,12 +199,31 @@ func TestMapDataType(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.pgType, func(t *testing.T) {
-			result := reader.mapDataType(tt.pgType, tt.udtName)
+			result := reader.mapDataType(tt.pgType, tt.udtName, false)
 			if result != tt.expected {
 				t.Errorf("mapDataType(%s, %s) = %s, expected %s", tt.pgType, tt.udtName, result, tt.expected)
 			}
 		})
 	}
+
+	// Test serial type detection with hasNextval=true
+	serialTests := []struct {
+		pgType   string
+		expected string
+	}{
+		{"integer", "serial"},
+		{"bigint", "bigserial"},
+		{"smallint", "smallserial"},
+	}
+
+	for _, tt := range serialTests {
+		t.Run(tt.pgType+"_with_nextval", func(t *testing.T) {
+			result := reader.mapDataType(tt.pgType, "", true)
+			if result != tt.expected {
+				t.Errorf("mapDataType(%s, '', true) = %s, expected %s", tt.pgType, result, tt.expected)
+			}
+		})
+	}
 }
 
 func TestParseIndexDefinition(t *testing.T) {
@@ -328,12 +347,12 @@ func TestDeriveRelationship(t *testing.T) {
 		t.Errorf("Expected relationship type %s, got %s", models.OneToMany, rel.Type)
 	}
 
-	if rel.FromTable != "users" {
-		t.Errorf("Expected FromTable 'users', got '%s'", rel.FromTable)
+	if rel.FromTable != "orders" {
+		t.Errorf("Expected FromTable 'orders', got '%s'", rel.FromTable)
 	}
 
-	if rel.ToTable != "orders" {
-		t.Errorf("Expected ToTable 'orders', got '%s'", rel.ToTable)
+	if rel.ToTable != "users" {
+		t.Errorf("Expected ToTable 'users', got '%s'", rel.ToTable)
 	}
 
 	if rel.ForeignKey != "fk_orders_user_id" {

pkg/readers/prisma/reader.go

@@ -128,11 +128,7 @@ func (r *Reader) parsePrisma(content string) (*models.Database, error) {
 		if matches := enumRegex.FindStringSubmatch(trimmed); matches != nil {
 			currentBlock = "enum"
 			enumName := matches[1]
-			currentEnum = &models.Enum{
-				Name:   enumName,
-				Schema: "public",
-				Values: make([]string, 0),
-			}
+			currentEnum = models.InitEnum(enumName, "public")
 			blockContent = []string{}
 			continue
 		}

pkg/readers/sqldir/README.md

@@ -93,6 +93,7 @@ fmt.Printf("Found %d scripts\n", len(schema.Scripts))
 ## Features
 
 - **Recursive Directory Scanning**: Automatically scans all subdirectories
+- **Symlink Skipping**: Symbolic links are automatically skipped (prevents loops and duplicates)
 - **Multiple Extensions**: Supports both `.sql` and `.pgsql` files
 - **Flexible Naming**: Extract metadata from filename patterns
 - **Error Handling**: Validates directory existence and file accessibility
@@ -153,8 +154,9 @@ go test ./pkg/readers/sqldir/
 ```
 
 Tests include:
-- Valid file parsing
+- Valid file parsing (underscore and hyphen formats)
 - Recursive directory scanning
+- Symlink skipping
 - Invalid filename handling
 - Empty directory handling
 - Error conditions

pkg/readers/sqldir/reader.go

@@ -107,11 +107,20 @@ func (r *Reader) readScripts() ([]*models.Script, error) {
 			return err
 		}
 
-		// Skip directories
+		// Don't process directories as files (WalkDir still descends into them recursively)
 		if d.IsDir() {
 			return nil
 		}
 
+		// Skip symlinks
+		info, err := d.Info()
+		if err != nil {
+			return err
+		}
+		if info.Mode()&os.ModeSymlink != 0 {
+			return nil
+		}
+
 		// Get filename
 		filename := d.Name()
 
@@ -150,13 +159,11 @@ func (r *Reader) readScripts() ([]*models.Script, error) {
 		}
 
 		// Create Script model
-		script := &models.Script{
-			Name:        name,
-			Description: fmt.Sprintf("SQL script from %s", relPath),
-			SQL:         string(content),
-			Priority:    priority,
-			Sequence:    uint(sequence),
-		}
+		script := models.InitScript(name)
+		script.Description = fmt.Sprintf("SQL script from %s", relPath)
+		script.SQL = string(content)
+		script.Priority = priority
+		script.Sequence = uint(sequence)
 
 		scripts = append(scripts, script)
 

pkg/readers/sqldir/reader_test.go

@@ -373,3 +373,65 @@ func TestReader_MixedFormat(t *testing.T) {
 		}
 	}
 }
+
+func TestReader_SkipSymlinks(t *testing.T) {
+	// Create temporary test directory
+	tempDir, err := os.MkdirTemp("", "sqldir-test-symlink-*")
+	if err != nil {
+		t.Fatalf("Failed to create temp directory: %v", err)
+	}
+	defer os.RemoveAll(tempDir)
+
+	// Create a real SQL file
+	realFile := filepath.Join(tempDir, "1_001_real_file.sql")
+	if err := os.WriteFile(realFile, []byte("SELECT 1;"), 0644); err != nil {
+		t.Fatalf("Failed to create real file: %v", err)
+	}
+
+	// Create another file to link to
+	targetFile := filepath.Join(tempDir, "2_001_target.sql")
+	if err := os.WriteFile(targetFile, []byte("SELECT 2;"), 0644); err != nil {
+		t.Fatalf("Failed to create target file: %v", err)
+	}
+
+	// Create a symlink to the target file (this should be skipped)
+	symlinkFile := filepath.Join(tempDir, "3_001_symlink.sql")
+	if err := os.Symlink(targetFile, symlinkFile); err != nil {
+		// Skip test on systems that don't support symlinks (e.g., Windows without admin)
+		t.Skipf("Symlink creation not supported: %v", err)
+	}
+
+	// Create reader
+	reader := NewReader(&readers.ReaderOptions{
+		FilePath: tempDir,
+	})
+
+	// Read database
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase failed: %v", err)
+	}
+
+	schema := db.Schemas[0]
+
+	// Should only have 2 scripts (real_file and target), symlink should be skipped
+	if len(schema.Scripts) != 2 {
+		t.Errorf("Expected 2 scripts (symlink should be skipped), got %d", len(schema.Scripts))
+	}
+
+	// Verify the scripts are the real files, not the symlink
+	scriptNames := make(map[string]bool)
+	for _, script := range schema.Scripts {
+		scriptNames[script.Name] = true
+	}
+
+	if !scriptNames["real_file"] {
+		t.Error("Expected 'real_file' script to be present")
+	}
+	if !scriptNames["target"] {
+		t.Error("Expected 'target' script to be present")
+	}
+	if scriptNames["symlink"] {
+		t.Error("Symlink script should have been skipped but was found")
+	}
+}

pkg/readers/sqlite/README.md

@@ -0,0 +1,75 @@
+# SQLite Reader
+
+Reads database schema from SQLite database files.
+
+## Usage
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
+)
+
+// Using file path
+options := &readers.ReaderOptions{
+    FilePath: "path/to/database.db",
+}
+
+reader := sqlite.NewReader(options)
+db, err := reader.ReadDatabase()
+
+// Or using connection string
+options := &readers.ReaderOptions{
+    ConnectionString: "path/to/database.db",
+}
+```
+
+## Features
+
+- Reads tables with columns and data types
+- Reads views with definitions
+- Reads primary keys
+- Reads foreign keys with CASCADE actions
+- Reads indexes (non-auto-generated)
+- Maps SQLite types to canonical types
+- Derives relationships from foreign keys
+
+## SQLite Specifics
+
+- SQLite doesn't support schemas, creates single "main" schema
+- Uses pure Go driver (modernc.org/sqlite) - no CGo required
+- Supports both file path and connection string
+- Auto-increment detection for INTEGER PRIMARY KEY columns
+- Foreign keys require `PRAGMA foreign_keys = ON` to be set
+
+## Example Schema
+
+```sql
+PRAGMA foreign_keys = ON;
+
+CREATE TABLE users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    username VARCHAR(50) NOT NULL UNIQUE,
+    email VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE posts (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id INTEGER NOT NULL,
+    title VARCHAR(200) NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+```
+
+## Type Mappings
+
+| SQLite Type | Canonical Type |
+|-------------|---------------|
+| INTEGER, INT | int |
+| BIGINT | int64 |
+| REAL, DOUBLE | float64 |
+| TEXT, VARCHAR | string |
+| BLOB | bytea |
+| BOOLEAN | bool |
+| DATE | date |
+| DATETIME, TIMESTAMP | timestamp |

pkg/readers/sqlite/queries.go

@@ -0,0 +1,306 @@
+package sqlite
+
+import (
+	"fmt"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// queryTables retrieves all tables from the SQLite database
+func (r *Reader) queryTables() ([]*models.Table, error) {
+	query := `
+		SELECT name
+		FROM sqlite_master
+		WHERE type = 'table'
+		  AND name NOT LIKE 'sqlite_%'
+		ORDER BY name
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	tables := make([]*models.Table, 0)
+	for rows.Next() {
+		var tableName string
+
+		if err := rows.Scan(&tableName); err != nil {
+			return nil, err
+		}
+
+		table := models.InitTable(tableName, "main")
+		tables = append(tables, table)
+	}
+
+	return tables, rows.Err()
+}
+
+// queryViews retrieves all views from the SQLite database
+func (r *Reader) queryViews() ([]*models.View, error) {
+	query := `
+		SELECT name, sql
+		FROM sqlite_master
+		WHERE type = 'view'
+		ORDER BY name
+	`
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	views := make([]*models.View, 0)
+	for rows.Next() {
+		var viewName string
+		var sql *string
+
+		if err := rows.Scan(&viewName, &sql); err != nil {
+			return nil, err
+		}
+
+		view := models.InitView(viewName, "main")
+		if sql != nil {
+			view.Definition = *sql
+		}
+
+		views = append(views, view)
+	}
+
+	return views, rows.Err()
+}
+
+// queryColumns retrieves all columns for a given table or view
+func (r *Reader) queryColumns(tableName string) (map[string]*models.Column, error) {
+	query := fmt.Sprintf("PRAGMA table_info(%s)", tableName)
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	columns := make(map[string]*models.Column)
+
+	for rows.Next() {
+		var cid int
+		var name, dataType string
+		var notNull, pk int
+		var defaultValue *string
+
+		if err := rows.Scan(&cid, &name, &dataType, &notNull, &defaultValue, &pk); err != nil {
+			return nil, err
+		}
+
+		column := models.InitColumn(name, tableName, "main")
+		column.Type = r.mapDataType(strings.ToUpper(dataType))
+		column.NotNull = (notNull == 1)
+		column.IsPrimaryKey = (pk > 0)
+		column.Sequence = uint(cid + 1)
+
+		if defaultValue != nil {
+			column.Default = *defaultValue
+		}
+
+		// Check for autoincrement (SQLite uses INTEGER PRIMARY KEY AUTOINCREMENT)
+		if pk > 0 && strings.EqualFold(dataType, "INTEGER") {
+			column.AutoIncrement = r.isAutoIncrement(tableName, name)
+		}
+
+		columns[name] = column
+	}
+
+	return columns, rows.Err()
+}
+
+// isAutoIncrement checks if a column is autoincrement
+func (r *Reader) isAutoIncrement(tableName, columnName string) bool {
+	// Check sqlite_sequence table or parse CREATE TABLE statement
+	query := `
+		SELECT sql
+		FROM sqlite_master
+		WHERE type = 'table' AND name = ?
+	`
+
+	var sql string
+	err := r.db.QueryRowContext(r.ctx, query, tableName).Scan(&sql)
+	if err != nil {
+		return false
+	}
+
+	// Check if the SQL contains AUTOINCREMENT for this column
+	return strings.Contains(strings.ToUpper(sql), strings.ToUpper(columnName)+" INTEGER PRIMARY KEY AUTOINCREMENT") ||
+		strings.Contains(strings.ToUpper(sql), strings.ToUpper(columnName)+" INTEGER AUTOINCREMENT")
+}
+
+// queryPrimaryKey retrieves the primary key constraint for a table
+func (r *Reader) queryPrimaryKey(tableName string) (*models.Constraint, error) {
+	query := fmt.Sprintf("PRAGMA table_info(%s)", tableName)
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var pkColumns []string
+
+	for rows.Next() {
+		var cid int
+		var name, dataType string
+		var notNull, pk int
+		var defaultValue *string
+
+		if err := rows.Scan(&cid, &name, &dataType, &notNull, &defaultValue, &pk); err != nil {
+			return nil, err
+		}
+
+		if pk > 0 {
+			pkColumns = append(pkColumns, name)
+		}
+	}
+
+	if len(pkColumns) == 0 {
+		return nil, nil
+	}
+
+	// Create primary key constraint
+	constraintName := fmt.Sprintf("%s_pkey", tableName)
+	constraint := models.InitConstraint(constraintName, models.PrimaryKeyConstraint)
+	constraint.Schema = "main"
+	constraint.Table = tableName
+	constraint.Columns = pkColumns
+
+	return constraint, rows.Err()
+}
+
+// queryForeignKeys retrieves all foreign key constraints for a table
+func (r *Reader) queryForeignKeys(tableName string) ([]*models.Constraint, error) {
+	query := fmt.Sprintf("PRAGMA foreign_key_list(%s)", tableName)
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	// Group foreign keys by id (since composite FKs have multiple rows)
+	fkMap := make(map[int]*models.Constraint)
+
+	for rows.Next() {
+		var id, seq int
+		var referencedTable, fromColumn, toColumn string
+		var onUpdate, onDelete, match string
+
+		if err := rows.Scan(&id, &seq, &referencedTable, &fromColumn, &toColumn, &onUpdate, &onDelete, &match); err != nil {
+			return nil, err
+		}
+
+		if _, exists := fkMap[id]; !exists {
+			constraintName := fmt.Sprintf("%s_%s_fkey", tableName, referencedTable)
+			if id > 0 {
+				constraintName = fmt.Sprintf("%s_%s_fkey_%d", tableName, referencedTable, id)
+			}
+
+			constraint := models.InitConstraint(constraintName, models.ForeignKeyConstraint)
+			constraint.Schema = "main"
+			constraint.Table = tableName
+			constraint.ReferencedSchema = "main"
+			constraint.ReferencedTable = referencedTable
+			constraint.OnUpdate = onUpdate
+			constraint.OnDelete = onDelete
+			constraint.Columns = []string{}
+			constraint.ReferencedColumns = []string{}
+
+			fkMap[id] = constraint
+		}
+
+		// Add column to the constraint
+		fkMap[id].Columns = append(fkMap[id].Columns, fromColumn)
+		fkMap[id].ReferencedColumns = append(fkMap[id].ReferencedColumns, toColumn)
+	}
+
+	// Convert map to slice
+	foreignKeys := make([]*models.Constraint, 0, len(fkMap))
+	for _, fk := range fkMap {
+		foreignKeys = append(foreignKeys, fk)
+	}
+
+	return foreignKeys, rows.Err()
+}
+
+// queryIndexes retrieves all indexes for a table
+func (r *Reader) queryIndexes(tableName string) ([]*models.Index, error) {
+	query := fmt.Sprintf("PRAGMA index_list(%s)", tableName)
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	indexes := make([]*models.Index, 0)
+
+	for rows.Next() {
+		var seq int
+		var name string
+		var unique int
+		var origin string
+		var partial int
+
+		if err := rows.Scan(&seq, &name, &unique, &origin, &partial); err != nil {
+			return nil, err
+		}
+
+		// Skip auto-generated indexes (origin = 'pk' for primary keys, etc.)
+		// origin: c = CREATE INDEX, u = UNIQUE constraint, pk = PRIMARY KEY
+		if origin == "pk" || origin == "u" {
+			continue
+		}
+
+		index := models.InitIndex(name, tableName, "main")
+		index.Unique = (unique == 1)
+
+		// Get index columns
+		columns, err := r.queryIndexColumns(name)
+		if err != nil {
+			return nil, err
+		}
+		index.Columns = columns
+
+		indexes = append(indexes, index)
+	}
+
+	return indexes, rows.Err()
+}
+
+// queryIndexColumns retrieves the columns for a specific index
+func (r *Reader) queryIndexColumns(indexName string) ([]string, error) {
+	query := fmt.Sprintf("PRAGMA index_info(%s)", indexName)
+
+	rows, err := r.db.QueryContext(r.ctx, query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	columns := make([]string, 0)
+
+	for rows.Next() {
+		var seqno, cid int
+		var name *string
+
+		if err := rows.Scan(&seqno, &cid, &name); err != nil {
+			return nil, err
+		}
+
+		if name != nil {
+			columns = append(columns, *name)
+		}
+	}
+
+	return columns, rows.Err()
+}

pkg/readers/sqlite/reader.go

@@ -0,0 +1,261 @@
+package sqlite
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"path/filepath"
+
+	_ "modernc.org/sqlite" // SQLite driver
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+// Reader implements the readers.Reader interface for SQLite databases
+type Reader struct {
+	options *readers.ReaderOptions
+	db      *sql.DB
+	ctx     context.Context
+}
+
+// NewReader creates a new SQLite reader
+func NewReader(options *readers.ReaderOptions) *Reader {
+	return &Reader{
+		options: options,
+		ctx:     context.Background(),
+	}
+}
+
+// ReadDatabase reads the entire database schema from SQLite
+func (r *Reader) ReadDatabase() (*models.Database, error) {
+	// Validate file path or connection string
+	dbPath := r.options.FilePath
+	if dbPath == "" && r.options.ConnectionString != "" {
+		dbPath = r.options.ConnectionString
+	}
+	if dbPath == "" {
+		return nil, fmt.Errorf("file path or connection string is required")
+	}
+
+	// Connect to the database
+	if err := r.connect(dbPath); err != nil {
+		return nil, fmt.Errorf("failed to connect: %w", err)
+	}
+	defer r.close()
+
+	// Get database name from file path
+	dbName := filepath.Base(dbPath)
+	if dbName == "" {
+		dbName = "sqlite"
+	}
+
+	// Initialize database model
+	db := models.InitDatabase(dbName)
+	db.DatabaseType = models.SqlLiteDatabaseType
+	db.SourceFormat = "sqlite"
+
+	// Get SQLite version
+	var version string
+	err := r.db.QueryRowContext(r.ctx, "SELECT sqlite_version()").Scan(&version)
+	if err == nil {
+		db.DatabaseVersion = version
+	}
+
+	// SQLite doesn't have schemas, so we create a single "main" schema
+	schema := models.InitSchema("main")
+	schema.RefDatabase = db
+
+	// Query tables
+	tables, err := r.queryTables()
+	if err != nil {
+		return nil, fmt.Errorf("failed to query tables: %w", err)
+	}
+	schema.Tables = tables
+
+	// Query views
+	views, err := r.queryViews()
+	if err != nil {
+		return nil, fmt.Errorf("failed to query views: %w", err)
+	}
+	schema.Views = views
+
+	// Query columns for tables and views
+	for _, table := range schema.Tables {
+		columns, err := r.queryColumns(table.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query columns for table %s: %w", table.Name, err)
+		}
+		table.Columns = columns
+		table.RefSchema = schema
+
+		// Query primary key
+		pk, err := r.queryPrimaryKey(table.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query primary key for table %s: %w", table.Name, err)
+		}
+		if pk != nil {
+			table.Constraints[pk.Name] = pk
+			// Mark columns as primary key and not null
+			for _, colName := range pk.Columns {
+				if col, exists := table.Columns[colName]; exists {
+					col.IsPrimaryKey = true
+					col.NotNull = true
+				}
+			}
+		}
+
+		// Query foreign keys
+		foreignKeys, err := r.queryForeignKeys(table.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query foreign keys for table %s: %w", table.Name, err)
+		}
+		for _, fk := range foreignKeys {
+			table.Constraints[fk.Name] = fk
+			// Derive relationship from foreign key
+			r.deriveRelationship(table, fk)
+		}
+
+		// Query indexes
+		indexes, err := r.queryIndexes(table.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query indexes for table %s: %w", table.Name, err)
+		}
+		for _, idx := range indexes {
+			table.Indexes[idx.Name] = idx
+		}
+	}
+
+	// Query columns for views
+	for _, view := range schema.Views {
+		columns, err := r.queryColumns(view.Name)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query columns for view %s: %w", view.Name, err)
+		}
+		view.Columns = columns
+		view.RefSchema = schema
+	}
+
+	// Add schema to database
+	db.Schemas = append(db.Schemas, schema)
+
+	return db, nil
+}
+
+// ReadSchema reads a single schema (returns the main schema from the database)
+func (r *Reader) ReadSchema() (*models.Schema, error) {
+	db, err := r.ReadDatabase()
+	if err != nil {
+		return nil, err
+	}
+	if len(db.Schemas) == 0 {
+		return nil, fmt.Errorf("no schemas found in database")
+	}
+	return db.Schemas[0], nil
+}
+
+// ReadTable reads a single table (returns the first table from the schema)
+func (r *Reader) ReadTable() (*models.Table, error) {
+	schema, err := r.ReadSchema()
+	if err != nil {
+		return nil, err
+	}
+	if len(schema.Tables) == 0 {
+		return nil, fmt.Errorf("no tables found in schema")
+	}
+	return schema.Tables[0], nil
+}
+
+// connect establishes a connection to the SQLite database
+func (r *Reader) connect(dbPath string) error {
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return err
+	}
+	r.db = db
+	return nil
+}
+
+// close closes the database connection
+func (r *Reader) close() {
+	if r.db != nil {
+		r.db.Close()
+	}
+}
+
+// mapDataType maps SQLite data types to canonical types
+func (r *Reader) mapDataType(sqliteType string) string {
+	// SQLite has a flexible type system, but we map common types
+	typeMap := map[string]string{
+		"INTEGER":           "int",
+		"INT":               "int",
+		"TINYINT":           "int8",
+		"SMALLINT":          "int16",
+		"MEDIUMINT":         "int",
+		"BIGINT":            "int64",
+		"UNSIGNED BIG INT":  "uint64",
+		"INT2":              "int16",
+		"INT8":              "int64",
+		"REAL":              "float64",
+		"DOUBLE":            "float64",
+		"DOUBLE PRECISION":  "float64",
+		"FLOAT":             "float32",
+		"NUMERIC":           "decimal",
+		"DECIMAL":           "decimal",
+		"BOOLEAN":           "bool",
+		"BOOL":              "bool",
+		"DATE":              "date",
+		"DATETIME":          "timestamp",
+		"TIMESTAMP":         "timestamp",
+		"TEXT":              "string",
+		"VARCHAR":           "string",
+		"CHAR":              "string",
+		"CHARACTER":         "string",
+		"VARYING CHARACTER": "string",
+		"NCHAR":             "string",
+		"NVARCHAR":          "string",
+		"CLOB":              "text",
+		"BLOB":              "bytea",
+	}
+
+	// Try exact match first
+	if mapped, exists := typeMap[sqliteType]; exists {
+		return mapped
+	}
+
+	// Try case-insensitive match for common types
+	sqliteTypeUpper := sqliteType
+	if len(sqliteType) > 0 {
+		// Extract base type (e.g., "VARCHAR(255)" -> "VARCHAR")
+		for baseType := range typeMap {
+			if len(sqliteTypeUpper) >= len(baseType) && sqliteTypeUpper[:len(baseType)] == baseType {
+				return typeMap[baseType]
+			}
+		}
+	}
+
+	// Default to string for unknown types
+	return "string"
+}
+
+// deriveRelationship creates a relationship from a foreign key constraint
+func (r *Reader) deriveRelationship(table *models.Table, fk *models.Constraint) {
+	relationshipName := fmt.Sprintf("%s_to_%s", table.Name, fk.ReferencedTable)
+
+	relationship := models.InitRelationship(relationshipName, models.OneToMany)
+	relationship.FromTable = table.Name
+	relationship.FromSchema = table.Schema
+	relationship.ToTable = fk.ReferencedTable
+	relationship.ToSchema = fk.ReferencedSchema
+	relationship.ForeignKey = fk.Name
+
+	// Store constraint actions in properties
+	if fk.OnDelete != "" {
+		relationship.Properties["on_delete"] = fk.OnDelete
+	}
+	if fk.OnUpdate != "" {
+		relationship.Properties["on_update"] = fk.OnUpdate
+	}
+
+	table.Relationships[relationshipName] = relationship
+}

pkg/readers/sqlite/reader_test.go

@@ -0,0 +1,334 @@
+package sqlite
+
+import (
+	"database/sql"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+// setupTestDatabase creates a temporary SQLite database with test data
+func setupTestDatabase(t *testing.T) string {
+	tmpDir := t.TempDir()
+	dbPath := filepath.Join(tmpDir, "test.db")
+
+	db, err := sql.Open("sqlite", dbPath)
+	require.NoError(t, err)
+	defer db.Close()
+
+	// Create test schema
+	schema := `
+		PRAGMA foreign_keys = ON;
+
+		CREATE TABLE users (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			username VARCHAR(50) NOT NULL UNIQUE,
+			email VARCHAR(100) NOT NULL,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+		);
+
+		CREATE TABLE posts (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id INTEGER NOT NULL,
+			title VARCHAR(200) NOT NULL,
+			content TEXT,
+			published BOOLEAN DEFAULT 0,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+			FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+		);
+
+		CREATE TABLE comments (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			post_id INTEGER NOT NULL,
+			user_id INTEGER NOT NULL,
+			comment TEXT NOT NULL,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+			FOREIGN KEY (post_id) REFERENCES posts(id) ON DELETE CASCADE,
+			FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+		);
+
+		CREATE INDEX idx_posts_user_id ON posts(user_id);
+		CREATE INDEX idx_comments_post_id ON comments(post_id);
+		CREATE UNIQUE INDEX idx_users_email ON users(email);
+
+		CREATE VIEW user_post_count AS
+		SELECT u.id, u.username, COUNT(p.id) as post_count
+		FROM users u
+		LEFT JOIN posts p ON u.id = p.user_id
+		GROUP BY u.id, u.username;
+	`
+
+	_, err = db.Exec(schema)
+	require.NoError(t, err)
+
+	return dbPath
+}
+
+func TestReader_ReadDatabase(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		FilePath: dbPath,
+	}
+
+	reader := NewReader(options)
+	db, err := reader.ReadDatabase()
+
+	require.NoError(t, err)
+	require.NotNil(t, db)
+
+	// Check database metadata
+	assert.Equal(t, "test.db", db.Name)
+	assert.Equal(t, models.SqlLiteDatabaseType, db.DatabaseType)
+	assert.Equal(t, "sqlite", db.SourceFormat)
+	assert.NotEmpty(t, db.DatabaseVersion)
+
+	// Check schemas (SQLite should have a single "main" schema)
+	require.Len(t, db.Schemas, 1)
+	schema := db.Schemas[0]
+	assert.Equal(t, "main", schema.Name)
+
+	// Check tables
+	assert.Len(t, schema.Tables, 3)
+	tableNames := make([]string, len(schema.Tables))
+	for i, table := range schema.Tables {
+		tableNames[i] = table.Name
+	}
+	assert.Contains(t, tableNames, "users")
+	assert.Contains(t, tableNames, "posts")
+	assert.Contains(t, tableNames, "comments")
+
+	// Check views
+	assert.Len(t, schema.Views, 1)
+	assert.Equal(t, "user_post_count", schema.Views[0].Name)
+	assert.NotEmpty(t, schema.Views[0].Definition)
+}
+
+func TestReader_ReadTable_Users(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		FilePath: dbPath,
+	}
+
+	reader := NewReader(options)
+	db, err := reader.ReadDatabase()
+
+	require.NoError(t, err)
+	require.NotNil(t, db)
+
+	// Find users table
+	var usersTable *models.Table
+	for _, table := range db.Schemas[0].Tables {
+		if table.Name == "users" {
+			usersTable = table
+			break
+		}
+	}
+
+	require.NotNil(t, usersTable)
+	assert.Equal(t, "users", usersTable.Name)
+	assert.Equal(t, "main", usersTable.Schema)
+
+	// Check columns
+	assert.Len(t, usersTable.Columns, 4)
+
+	// Check id column
+	idCol, exists := usersTable.Columns["id"]
+	require.True(t, exists)
+	assert.Equal(t, "int", idCol.Type)
+	assert.True(t, idCol.IsPrimaryKey)
+	assert.True(t, idCol.AutoIncrement)
+	assert.True(t, idCol.NotNull)
+
+	// Check username column
+	usernameCol, exists := usersTable.Columns["username"]
+	require.True(t, exists)
+	assert.Equal(t, "string", usernameCol.Type)
+	assert.True(t, usernameCol.NotNull)
+	assert.False(t, usernameCol.IsPrimaryKey)
+
+	// Check email column
+	emailCol, exists := usersTable.Columns["email"]
+	require.True(t, exists)
+	assert.Equal(t, "string", emailCol.Type)
+	assert.True(t, emailCol.NotNull)
+
+	// Check primary key constraint
+	assert.Len(t, usersTable.Constraints, 1)
+	pkConstraint, exists := usersTable.Constraints["users_pkey"]
+	require.True(t, exists)
+	assert.Equal(t, models.PrimaryKeyConstraint, pkConstraint.Type)
+	assert.Equal(t, []string{"id"}, pkConstraint.Columns)
+
+	// Check indexes (should have unique index on email and username)
+	assert.GreaterOrEqual(t, len(usersTable.Indexes), 1)
+}
+
+func TestReader_ReadTable_Posts(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		FilePath: dbPath,
+	}
+
+	reader := NewReader(options)
+	db, err := reader.ReadDatabase()
+
+	require.NoError(t, err)
+	require.NotNil(t, db)
+
+	// Find posts table
+	var postsTable *models.Table
+	for _, table := range db.Schemas[0].Tables {
+		if table.Name == "posts" {
+			postsTable = table
+			break
+		}
+	}
+
+	require.NotNil(t, postsTable)
+
+	// Check columns
+	assert.Len(t, postsTable.Columns, 6)
+
+	// Check foreign key constraint
+	hasForeignKey := false
+	for _, constraint := range postsTable.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			hasForeignKey = true
+			assert.Equal(t, "users", constraint.ReferencedTable)
+			assert.Equal(t, "CASCADE", constraint.OnDelete)
+		}
+	}
+	assert.True(t, hasForeignKey, "Posts table should have a foreign key constraint")
+
+	// Check relationships
+	assert.GreaterOrEqual(t, len(postsTable.Relationships), 1)
+
+	// Check indexes
+	hasUserIdIndex := false
+	for _, index := range postsTable.Indexes {
+		if index.Name == "idx_posts_user_id" {
+			hasUserIdIndex = true
+			assert.Contains(t, index.Columns, "user_id")
+		}
+	}
+	assert.True(t, hasUserIdIndex, "Posts table should have idx_posts_user_id index")
+}
+
+func TestReader_ReadTable_Comments(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		FilePath: dbPath,
+	}
+
+	reader := NewReader(options)
+	db, err := reader.ReadDatabase()
+
+	require.NoError(t, err)
+	require.NotNil(t, db)
+
+	// Find comments table
+	var commentsTable *models.Table
+	for _, table := range db.Schemas[0].Tables {
+		if table.Name == "comments" {
+			commentsTable = table
+			break
+		}
+	}
+
+	require.NotNil(t, commentsTable)
+
+	// Check foreign key constraints (should have 2)
+	fkCount := 0
+	for _, constraint := range commentsTable.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			fkCount++
+		}
+	}
+	assert.Equal(t, 2, fkCount, "Comments table should have 2 foreign key constraints")
+}
+
+func TestReader_ReadSchema(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		FilePath: dbPath,
+	}
+
+	reader := NewReader(options)
+	schema, err := reader.ReadSchema()
+
+	require.NoError(t, err)
+	require.NotNil(t, schema)
+	assert.Equal(t, "main", schema.Name)
+	assert.Len(t, schema.Tables, 3)
+	assert.Len(t, schema.Views, 1)
+}
+
+func TestReader_ReadTable(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		FilePath: dbPath,
+	}
+
+	reader := NewReader(options)
+	table, err := reader.ReadTable()
+
+	require.NoError(t, err)
+	require.NotNil(t, table)
+	assert.NotEmpty(t, table.Name)
+	assert.NotEmpty(t, table.Columns)
+}
+
+func TestReader_ConnectionString(t *testing.T) {
+	dbPath := setupTestDatabase(t)
+	defer os.Remove(dbPath)
+
+	options := &readers.ReaderOptions{
+		ConnectionString: dbPath,
+	}
+
+	reader := NewReader(options)
+	db, err := reader.ReadDatabase()
+
+	require.NoError(t, err)
+	require.NotNil(t, db)
+	assert.Len(t, db.Schemas, 1)
+}
+
+func TestReader_InvalidPath(t *testing.T) {
+	options := &readers.ReaderOptions{
+		FilePath: "/nonexistent/path/to/database.db",
+	}
+
+	reader := NewReader(options)
+	_, err := reader.ReadDatabase()
+
+	assert.Error(t, err)
+}
+
+func TestReader_MissingPath(t *testing.T) {
+	options := &readers.ReaderOptions{}
+
+	reader := NewReader(options)
+	_, err := reader.ReadDatabase()
+
+	assert.Error(t, err)
+	assert.Contains(t, err.Error(), "file path or connection string is required")
+}

pkg/reflectutil/doc.go

@@ -0,0 +1,36 @@
+// Package reflectutil provides reflection utilities for analyzing Go code structures.
+//
+// # Overview
+//
+// The reflectutil package offers helper functions for working with Go's reflection
+// capabilities, particularly for parsing Go struct definitions and extracting type
+// information. This is used by readers that parse ORM model files.
+//
+// # Features
+//
+//   - Struct tag parsing and extraction
+//   - Type information analysis
+//   - Field metadata extraction
+//   - ORM tag interpretation (GORM, Bun, etc.)
+//
+// # Usage
+//
+// This package is primarily used internally by readers like GORM and Bun to parse
+// Go struct definitions and convert them to database schema models.
+//
+//	// Example: Parse struct tags
+//	tags := reflectutil.ParseStructTags(field)
+//	columnName := tags.Get("db")
+//
+// # Supported ORM Tags
+//
+// The package understands tag conventions from:
+//   - GORM (gorm tag)
+//   - Bun (bun tag)
+//   - Standard database/sql (db tag)
+//
+// # Purpose
+//
+// This package enables RelSpec to read existing ORM models and convert them to
+// a unified schema representation for transformation to other formats.
+package reflectutil

pkg/reflectutil/helpers.go

@@ -0,0 +1,326 @@
+package reflectutil
+
+import (
+	"reflect"
+	"strings"
+)
+
+// Deref dereferences pointers until it reaches a non-pointer value
+// Returns the dereferenced value and true if successful, or the original value and false if nil
+func Deref(v reflect.Value) (reflect.Value, bool) {
+	for v.Kind() == reflect.Ptr {
+		if v.IsNil() {
+			return v, false
+		}
+		v = v.Elem()
+	}
+	return v, true
+}
+
+// DerefInterface dereferences an interface{} until it reaches a non-pointer value
+func DerefInterface(i interface{}) reflect.Value {
+	v := reflect.ValueOf(i)
+	v, _ = Deref(v)
+	return v
+}
+
+// GetFieldValue extracts a field value from a struct, map, or pointer
+// Returns nil if the field doesn't exist or can't be accessed
+func GetFieldValue(item interface{}, field string) interface{} {
+	v := reflect.ValueOf(item)
+	v, ok := Deref(v)
+	if !ok {
+		return nil
+	}
+
+	switch v.Kind() {
+	case reflect.Struct:
+		fieldVal := v.FieldByName(field)
+		if fieldVal.IsValid() {
+			return fieldVal.Interface()
+		}
+		return nil
+
+	case reflect.Map:
+		keyVal := reflect.ValueOf(field)
+		mapVal := v.MapIndex(keyVal)
+		if mapVal.IsValid() {
+			return mapVal.Interface()
+		}
+		return nil
+
+	default:
+		return nil
+	}
+}
+
+// IsSliceOrArray checks if an interface{} is a slice or array
+func IsSliceOrArray(i interface{}) bool {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return false
+	}
+	k := v.Kind()
+	return k == reflect.Slice || k == reflect.Array
+}
+
+// IsMap checks if an interface{} is a map
+func IsMap(i interface{}) bool {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return false
+	}
+	return v.Kind() == reflect.Map
+}
+
+// SliceLen returns the length of a slice/array, or 0 if not a slice/array
+func SliceLen(i interface{}) int {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return 0
+	}
+	if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
+		return 0
+	}
+	return v.Len()
+}
+
+// MapLen returns the length of a map, or 0 if not a map
+func MapLen(i interface{}) int {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return 0
+	}
+	if v.Kind() != reflect.Map {
+		return 0
+	}
+	return v.Len()
+}
+
+// SliceToInterfaces converts a slice/array to []interface{}
+// Returns empty slice if not a slice/array
+func SliceToInterfaces(i interface{}) []interface{} {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return []interface{}{}
+	}
+
+	if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
+		return []interface{}{}
+	}
+
+	result := make([]interface{}, v.Len())
+	for i := 0; i < v.Len(); i++ {
+		result[i] = v.Index(i).Interface()
+	}
+	return result
+}
+
+// MapKeys returns all keys from a map as []interface{}
+// Returns empty slice if not a map
+func MapKeys(i interface{}) []interface{} {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return []interface{}{}
+	}
+
+	if v.Kind() != reflect.Map {
+		return []interface{}{}
+	}
+
+	keys := v.MapKeys()
+	result := make([]interface{}, len(keys))
+	for i, key := range keys {
+		result[i] = key.Interface()
+	}
+	return result
+}
+
+// MapValues returns all values from a map as []interface{}
+// Returns empty slice if not a map
+func MapValues(i interface{}) []interface{} {
+	v := reflect.ValueOf(i)
+	v, ok := Deref(v)
+	if !ok {
+		return []interface{}{}
+	}
+
+	if v.Kind() != reflect.Map {
+		return []interface{}{}
+	}
+
+	result := make([]interface{}, 0, v.Len())
+	iter := v.MapRange()
+	for iter.Next() {
+		result = append(result, iter.Value().Interface())
+	}
+	return result
+}
+
+// MapGet safely gets a value from a map by key
+// Returns nil if key doesn't exist or not a map
+func MapGet(m interface{}, key interface{}) interface{} {
+	v := reflect.ValueOf(m)
+	v, ok := Deref(v)
+	if !ok {
+		return nil
+	}
+
+	if v.Kind() != reflect.Map {
+		return nil
+	}
+
+	keyVal := reflect.ValueOf(key)
+	mapVal := v.MapIndex(keyVal)
+	if mapVal.IsValid() {
+		return mapVal.Interface()
+	}
+
+	return nil
+}
+
+// SliceIndex safely gets an element from a slice/array by index
+// Returns nil if index out of bounds or not a slice/array
+func SliceIndex(slice interface{}, index int) interface{} {
+	v := reflect.ValueOf(slice)
+	v, ok := Deref(v)
+	if !ok {
+		return nil
+	}
+
+	if v.Kind() != reflect.Slice && v.Kind() != reflect.Array {
+		return nil
+	}
+
+	if index < 0 || index >= v.Len() {
+		return nil
+	}
+
+	return v.Index(index).Interface()
+}
+
+// CompareValues compares two values for sorting
+// Returns -1 if a < b, 0 if a == b, 1 if a > b
+func CompareValues(a, b interface{}) int {
+	if a == nil && b == nil {
+		return 0
+	}
+	if a == nil {
+		return -1
+	}
+	if b == nil {
+		return 1
+	}
+
+	va := reflect.ValueOf(a)
+	vb := reflect.ValueOf(b)
+
+	// Handle different types
+	switch va.Kind() {
+	case reflect.String:
+		if vb.Kind() == reflect.String {
+			as := va.String()
+			bs := vb.String()
+			if as < bs {
+				return -1
+			} else if as > bs {
+				return 1
+			}
+			return 0
+		}
+
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		if vb.Kind() >= reflect.Int && vb.Kind() <= reflect.Int64 {
+			ai := va.Int()
+			bi := vb.Int()
+			if ai < bi {
+				return -1
+			} else if ai > bi {
+				return 1
+			}
+			return 0
+		}
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		if vb.Kind() >= reflect.Uint && vb.Kind() <= reflect.Uint64 {
+			au := va.Uint()
+			bu := vb.Uint()
+			if au < bu {
+				return -1
+			} else if au > bu {
+				return 1
+			}
+			return 0
+		}
+
+	case reflect.Float32, reflect.Float64:
+		if vb.Kind() == reflect.Float32 || vb.Kind() == reflect.Float64 {
+			af := va.Float()
+			bf := vb.Float()
+			if af < bf {
+				return -1
+			} else if af > bf {
+				return 1
+			}
+			return 0
+		}
+	}
+
+	return 0
+}
+
+// GetNestedValue gets a nested value using dot notation path
+// Example: GetNestedValue(obj, "database.schema.table")
+func GetNestedValue(m interface{}, path string) interface{} {
+	if path == "" {
+		return m
+	}
+
+	parts := strings.Split(path, ".")
+	current := m
+
+	for _, part := range parts {
+		if current == nil {
+			return nil
+		}
+
+		v := reflect.ValueOf(current)
+		v, ok := Deref(v)
+		if !ok {
+			return nil
+		}
+
+		switch v.Kind() {
+		case reflect.Map:
+			keyVal := reflect.ValueOf(part)
+			mapVal := v.MapIndex(keyVal)
+			if !mapVal.IsValid() {
+				return nil
+			}
+			current = mapVal.Interface()
+
+		case reflect.Struct:
+			fieldVal := v.FieldByName(part)
+			if !fieldVal.IsValid() {
+				return nil
+			}
+			current = fieldVal.Interface()
+
+		default:
+			return nil
+		}
+	}
+
+	return current
+}
+
+// DeepEqual performs a deep equality check between two values
+func DeepEqual(a, b interface{}) bool {
+	return reflect.DeepEqual(a, b)
+}

pkg/reflectutil/helpers_test.go

@@ -0,0 +1,490 @@
+package reflectutil
+
+import (
+	"reflect"
+	"testing"
+)
+
+type testStruct struct {
+	Name    string
+	Age     int
+	Active  bool
+	Nested  *nestedStruct
+	Private string
+}
+
+type nestedStruct struct {
+	Value string
+	Count int
+}
+
+func TestDeref(t *testing.T) {
+	tests := []struct {
+		name      string
+		input     interface{}
+		wantValid bool
+		wantKind  reflect.Kind
+	}{
+		{
+			name:      "non-pointer int",
+			input:     42,
+			wantValid: true,
+			wantKind:  reflect.Int,
+		},
+		{
+			name:      "single pointer",
+			input:     ptrInt(42),
+			wantValid: true,
+			wantKind:  reflect.Int,
+		},
+		{
+			name:      "double pointer",
+			input:     ptrPtr(ptrInt(42)),
+			wantValid: true,
+			wantKind:  reflect.Int,
+		},
+		{
+			name:      "nil pointer",
+			input:     (*int)(nil),
+			wantValid: false,
+			wantKind:  reflect.Ptr,
+		},
+		{
+			name:      "string",
+			input:     "test",
+			wantValid: true,
+			wantKind:  reflect.String,
+		},
+		{
+			name:      "struct",
+			input:     testStruct{Name: "test"},
+			wantValid: true,
+			wantKind:  reflect.Struct,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			v := reflect.ValueOf(tt.input)
+			got, valid := Deref(v)
+
+			if valid != tt.wantValid {
+				t.Errorf("Deref() valid = %v, want %v", valid, tt.wantValid)
+			}
+
+			if got.Kind() != tt.wantKind {
+				t.Errorf("Deref() kind = %v, want %v", got.Kind(), tt.wantKind)
+			}
+		})
+	}
+}
+
+func TestDerefInterface(t *testing.T) {
+	i := 42
+	pi := &i
+	ppi := &pi
+
+	tests := []struct {
+		name     string
+		input    interface{}
+		wantKind reflect.Kind
+	}{
+		{"int", 42, reflect.Int},
+		{"pointer to int", &i, reflect.Int},
+		{"double pointer to int", ppi, reflect.Int},
+		{"string", "test", reflect.String},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := DerefInterface(tt.input)
+			if got.Kind() != tt.wantKind {
+				t.Errorf("DerefInterface() kind = %v, want %v", got.Kind(), tt.wantKind)
+			}
+		})
+	}
+}
+
+func TestGetFieldValue(t *testing.T) {
+	ts := testStruct{
+		Name:   "John",
+		Age:    30,
+		Active: true,
+		Nested: &nestedStruct{Value: "nested", Count: 5},
+	}
+
+	tests := []struct {
+		name  string
+		item  interface{}
+		field string
+		want  interface{}
+	}{
+		{"struct field Name", ts, "Name", "John"},
+		{"struct field Age", ts, "Age", 30},
+		{"struct field Active", ts, "Active", true},
+		{"struct non-existent field", ts, "NonExistent", nil},
+		{"pointer to struct", &ts, "Name", "John"},
+		{"map string key", map[string]string{"key": "value"}, "key", "value"},
+		{"map int key", map[string]int{"count": 42}, "count", 42},
+		{"map non-existent key", map[string]string{"key": "value"}, "missing", nil},
+		{"nil pointer", (*testStruct)(nil), "Name", nil},
+		{"non-struct non-map", 42, "field", nil},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := GetFieldValue(tt.item, tt.field)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("GetFieldValue() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsSliceOrArray(t *testing.T) {
+	arr := [3]int{1, 2, 3}
+
+	tests := []struct {
+		name  string
+		input interface{}
+		want  bool
+	}{
+		{"slice", []int{1, 2, 3}, true},
+		{"array", arr, true},
+		{"pointer to slice", &[]int{1, 2, 3}, true},
+		{"string", "test", false},
+		{"int", 42, false},
+		{"map", map[string]int{}, false},
+		{"nil slice", ([]int)(nil), true}, // nil slice is still Kind==Slice
+		{"nil pointer", (*[]int)(nil), false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := IsSliceOrArray(tt.input)
+			if got != tt.want {
+				t.Errorf("IsSliceOrArray() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestIsMap(t *testing.T) {
+	tests := []struct {
+		name  string
+		input interface{}
+		want  bool
+	}{
+		{"map[string]int", map[string]int{"a": 1}, true},
+		{"map[int]string", map[int]string{1: "a"}, true},
+		{"pointer to map", &map[string]int{"a": 1}, true},
+		{"slice", []int{1, 2, 3}, false},
+		{"string", "test", false},
+		{"int", 42, false},
+		{"nil map", (map[string]int)(nil), true}, // nil map is still Kind==Map
+		{"nil pointer", (*map[string]int)(nil), false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := IsMap(tt.input)
+			if got != tt.want {
+				t.Errorf("IsMap() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSliceLen(t *testing.T) {
+	arr := [3]int{1, 2, 3}
+
+	tests := []struct {
+		name  string
+		input interface{}
+		want  int
+	}{
+		{"slice length 3", []int{1, 2, 3}, 3},
+		{"empty slice", []int{}, 0},
+		{"array length 3", arr, 3},
+		{"pointer to slice", &[]int{1, 2, 3}, 3},
+		{"not a slice", "test", 0},
+		{"int", 42, 0},
+		{"nil slice", ([]int)(nil), 0},
+		{"nil pointer", (*[]int)(nil), 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SliceLen(tt.input)
+			if got != tt.want {
+				t.Errorf("SliceLen() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestMapLen(t *testing.T) {
+	tests := []struct {
+		name  string
+		input interface{}
+		want  int
+	}{
+		{"map length 2", map[string]int{"a": 1, "b": 2}, 2},
+		{"empty map", map[string]int{}, 0},
+		{"pointer to map", &map[string]int{"a": 1}, 1},
+		{"not a map", []int{1, 2, 3}, 0},
+		{"string", "test", 0},
+		{"nil map", (map[string]int)(nil), 0},
+		{"nil pointer", (*map[string]int)(nil), 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := MapLen(tt.input)
+			if got != tt.want {
+				t.Errorf("MapLen() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSliceToInterfaces(t *testing.T) {
+	tests := []struct {
+		name  string
+		input interface{}
+		want  []interface{}
+	}{
+		{"int slice", []int{1, 2, 3}, []interface{}{1, 2, 3}},
+		{"string slice", []string{"a", "b"}, []interface{}{"a", "b"}},
+		{"empty slice", []int{}, []interface{}{}},
+		{"pointer to slice", &[]int{1, 2}, []interface{}{1, 2}},
+		{"not a slice", "test", []interface{}{}},
+		{"nil slice", ([]int)(nil), []interface{}{}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SliceToInterfaces(tt.input)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("SliceToInterfaces() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestMapKeys(t *testing.T) {
+	tests := []struct {
+		name  string
+		input interface{}
+		want  []interface{}
+	}{
+		{"map with keys", map[string]int{"a": 1, "b": 2}, []interface{}{"a", "b"}},
+		{"empty map", map[string]int{}, []interface{}{}},
+		{"not a map", []int{1, 2, 3}, []interface{}{}},
+		{"nil map", (map[string]int)(nil), []interface{}{}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := MapKeys(tt.input)
+			if len(got) != len(tt.want) {
+				t.Errorf("MapKeys() length = %v, want %v", len(got), len(tt.want))
+			}
+			// For maps, order is not guaranteed, so just check length
+		})
+	}
+}
+
+func TestMapValues(t *testing.T) {
+	tests := []struct {
+		name  string
+		input interface{}
+		want  int // length of values
+	}{
+		{"map with values", map[string]int{"a": 1, "b": 2}, 2},
+		{"empty map", map[string]int{}, 0},
+		{"not a map", []int{1, 2, 3}, 0},
+		{"nil map", (map[string]int)(nil), 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := MapValues(tt.input)
+			if len(got) != tt.want {
+				t.Errorf("MapValues() length = %v, want %v", len(got), tt.want)
+			}
+		})
+	}
+}
+
+func TestMapGet(t *testing.T) {
+	m := map[string]int{"a": 1, "b": 2}
+
+	tests := []struct {
+		name  string
+		input interface{}
+		key   interface{}
+		want  interface{}
+	}{
+		{"existing key", m, "a", 1},
+		{"existing key b", m, "b", 2},
+		{"non-existing key", m, "c", nil},
+		{"pointer to map", &m, "a", 1},
+		{"not a map", []int{1, 2}, 0, nil},
+		{"nil map", (map[string]int)(nil), "a", nil},
+		{"nil pointer", (*map[string]int)(nil), "a", nil},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := MapGet(tt.input, tt.key)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("MapGet() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSliceIndex(t *testing.T) {
+	s := []int{10, 20, 30}
+
+	tests := []struct {
+		name  string
+		slice interface{}
+		index int
+		want  interface{}
+	}{
+		{"index 0", s, 0, 10},
+		{"index 1", s, 1, 20},
+		{"index 2", s, 2, 30},
+		{"negative index", s, -1, nil},
+		{"out of bounds", s, 5, nil},
+		{"pointer to slice", &s, 1, 20},
+		{"not a slice", "test", 0, nil},
+		{"nil slice", ([]int)(nil), 0, nil},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := SliceIndex(tt.slice, tt.index)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("SliceIndex() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestCompareValues(t *testing.T) {
+	tests := []struct {
+		name string
+		a    interface{}
+		b    interface{}
+		want int
+	}{
+		{"both nil", nil, nil, 0},
+		{"a nil", nil, 5, -1},
+		{"b nil", 5, nil, 1},
+		{"equal strings", "abc", "abc", 0},
+		{"a less than b strings", "abc", "xyz", -1},
+		{"a greater than b strings", "xyz", "abc", 1},
+		{"equal ints", 5, 5, 0},
+		{"a less than b ints", 3, 7, -1},
+		{"a greater than b ints", 10, 5, 1},
+		{"equal floats", 3.14, 3.14, 0},
+		{"a less than b floats", 2.5, 5.5, -1},
+		{"a greater than b floats", 10.5, 5.5, 1},
+		{"equal uints", uint(5), uint(5), 0},
+		{"different types", "abc", 123, 0},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := CompareValues(tt.a, tt.b)
+			if got != tt.want {
+				t.Errorf("CompareValues(%v, %v) = %v, want %v", tt.a, tt.b, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestGetNestedValue(t *testing.T) {
+	nested := map[string]interface{}{
+		"level1": map[string]interface{}{
+			"level2": map[string]interface{}{
+				"value": "deep",
+			},
+		},
+	}
+
+	ts := testStruct{
+		Name: "John",
+		Nested: &nestedStruct{
+			Value: "nested value",
+			Count: 42,
+		},
+	}
+
+	tests := []struct {
+		name  string
+		input interface{}
+		path  string
+		want  interface{}
+	}{
+		{"empty path", nested, "", nested},
+		{"single level map", nested, "level1", nested["level1"]},
+		{"nested map", nested, "level1.level2", map[string]interface{}{"value": "deep"}},
+		{"deep nested map", nested, "level1.level2.value", "deep"},
+		{"struct field", ts, "Name", "John"},
+		{"nested struct field", ts, "Nested", ts.Nested},
+		{"non-existent path", nested, "missing.path", nil},
+		{"nil input", nil, "path", nil},
+		{"partial missing path", nested, "level1.missing", nil},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := GetNestedValue(tt.input, tt.path)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("GetNestedValue() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestDeepEqual(t *testing.T) {
+	tests := []struct {
+		name string
+		a    interface{}
+		b    interface{}
+		want bool
+	}{
+		{"equal ints", 42, 42, true},
+		{"different ints", 42, 43, false},
+		{"equal strings", "test", "test", true},
+		{"different strings", "test", "other", false},
+		{"equal slices", []int{1, 2, 3}, []int{1, 2, 3}, true},
+		{"different slices", []int{1, 2, 3}, []int{1, 2, 4}, false},
+		{"equal maps", map[string]int{"a": 1}, map[string]int{"a": 1}, true},
+		{"different maps", map[string]int{"a": 1}, map[string]int{"a": 2}, false},
+		{"both nil", nil, nil, true},
+		{"one nil", nil, 42, false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := DeepEqual(tt.a, tt.b)
+			if got != tt.want {
+				t.Errorf("DeepEqual(%v, %v) = %v, want %v", tt.a, tt.b, got, tt.want)
+			}
+		})
+	}
+}
+
+// Helper functions
+func ptrInt(i int) *int {
+	return &i
+}
+
+func ptrPtr(p *int) **int {
+	return &p
+}

pkg/transform/doc.go

@@ -0,0 +1,34 @@
+// Package transform provides validation and transformation utilities for database models.
+//
+// # Overview
+//
+// The transform package contains a Transformer type that provides methods for validating
+// and normalizing database schemas. It ensures schema correctness and consistency across
+// different format conversions.
+//
+// # Features
+//
+//   - Database validation (structure and naming conventions)
+//   - Schema validation (completeness and integrity)
+//   - Table validation (column definitions and constraints)
+//   - Data type normalization
+//
+// # Usage
+//
+//	transformer := transform.NewTransformer()
+//	err := transformer.ValidateDatabase(db)
+//	if err != nil {
+//	    log.Fatal("Invalid database schema:", err)
+//	}
+//
+// # Validation Scope
+//
+// The transformer validates:
+//   - Required fields presence
+//   - Naming convention adherence
+//   - Data type compatibility
+//   - Constraint consistency
+//   - Relationship integrity
+//
+// Note: Some validation methods are currently stubs and will be implemented as needed.
+package transform

pkg/ui/column_dataops.go

@@ -0,0 +1,95 @@
+package ui
+
+import "git.warky.dev/wdevs/relspecgo/pkg/models"
+
+// Column data operations - business logic for column management
+
+// CreateColumn creates a new column and adds it to a table
+func (se *SchemaEditor) CreateColumn(schemaIndex, tableIndex int, name, dataType string, isPrimaryKey, isNotNull bool) *models.Column {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return nil
+	}
+
+	if table.Columns == nil {
+		table.Columns = make(map[string]*models.Column)
+	}
+
+	newColumn := &models.Column{
+		Name:         name,
+		Type:         dataType,
+		IsPrimaryKey: isPrimaryKey,
+		NotNull:      isNotNull,
+	}
+	table.UpdateDate()
+	table.Columns[name] = newColumn
+	return newColumn
+}
+
+// UpdateColumn updates an existing column's properties
+func (se *SchemaEditor) UpdateColumn(schemaIndex, tableIndex int, oldName, newName, dataType string, isPrimaryKey, isNotNull bool, defaultValue interface{}, description string) bool {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return false
+	}
+
+	column, exists := table.Columns[oldName]
+	if !exists {
+		return false
+	}
+
+	table.UpdateDate()
+
+	// If name changed, remove old entry and create new one
+	if oldName != newName {
+		delete(table.Columns, oldName)
+		column.Name = newName
+		table.Columns[newName] = column
+	}
+
+	// Update properties
+	column.Type = dataType
+	column.IsPrimaryKey = isPrimaryKey
+	column.NotNull = isNotNull
+	column.Default = defaultValue
+	column.Description = description
+
+	return true
+}
+
+// DeleteColumn removes a column from a table
+func (se *SchemaEditor) DeleteColumn(schemaIndex, tableIndex int, columnName string) bool {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return false
+	}
+
+	if _, exists := table.Columns[columnName]; !exists {
+		return false
+	}
+
+	table.UpdateDate()
+
+	delete(table.Columns, columnName)
+	return true
+}
+
+// GetColumn returns a column by name
+func (se *SchemaEditor) GetColumn(schemaIndex, tableIndex int, columnName string) *models.Column {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return nil
+	}
+
+	return table.Columns[columnName]
+}
+
+// GetAllColumns returns all columns in a table
+func (se *SchemaEditor) GetAllColumns(schemaIndex, tableIndex int) map[string]*models.Column {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return nil
+	}
+
+	return table.Columns
+}

pkg/ui/column_screens.go

@@ -0,0 +1,214 @@
+package ui
+
+import (
+	"fmt"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// showColumnEditor shows editor for a specific column
+func (se *SchemaEditor) showColumnEditor(schemaIndex, tableIndex, colIndex int, column *models.Column) {
+	form := tview.NewForm()
+
+	// Store original name to handle renames
+	originalName := column.Name
+
+	// Local variables to collect changes
+	newName := column.Name
+	newType := column.Type
+	newIsPK := column.IsPrimaryKey
+	newIsNotNull := column.NotNull
+	newDefault := column.Default
+	newDescription := column.Description
+	newGUID := column.GUID
+
+	// Column type options: PostgreSQL, MySQL, SQL Server, and common SQL types
+	columnTypes := []string{
+		// Numeric Types
+		"SMALLINT", "INTEGER", "BIGINT", "INT", "TINYINT", "FLOAT", "REAL", "DOUBLE PRECISION",
+		"DECIMAL(10,2)", "NUMERIC", "DECIMAL", "NUMERIC(10,2)",
+		// Character Types
+		"CHAR", "VARCHAR", "VARCHAR(255)", "TEXT", "NCHAR", "NVARCHAR", "NVARCHAR(255)",
+		// Boolean
+		"BOOLEAN", "BOOL", "BIT",
+		// Date/Time Types
+		"DATE", "TIME", "TIMESTAMP", "TIMESTAMP WITH TIME ZONE", "INTERVAL",
+		"DATETIME", "DATETIME2", "DATEFIRST",
+		// UUID and JSON
+		"UUID", "GUID", "JSON", "JSONB",
+		// Binary Types
+		"BYTEA", "BLOB", "IMAGE", "VARBINARY", "VARBINARY(MAX)", "BINARY",
+		// PostgreSQL Special Types
+		"int4range", "int8range", "numrange", "tsrange", "tstzrange", "daterange",
+		"HSTORE", "CITEXT", "INET", "MACADDR", "POINT", "LINE", "LSEG", "BOX", "PATH", "POLYGON", "CIRCLE",
+		// Array Types
+		"INTEGER ARRAY", "VARCHAR ARRAY", "TEXT ARRAY", "BIGINT ARRAY",
+		// MySQL Specific
+		"MEDIUMINT", "DOUBLE", "FLOAT(10,2)",
+		// SQL Server Specific
+		"MONEY", "SMALLMONEY", "SQL_VARIANT",
+	}
+	selectedTypeIndex := 0
+
+	// Add existing type if not already in the list
+	typeExists := false
+	for i, opt := range columnTypes {
+		if opt == column.Type {
+			selectedTypeIndex = i
+			typeExists = true
+			break
+		}
+	}
+	if !typeExists && column.Type != "" {
+		columnTypes = append(columnTypes, column.Type)
+		selectedTypeIndex = len(columnTypes) - 1
+	}
+
+	form.AddInputField("Column Name", column.Name, 40, nil, func(value string) {
+		newName = value
+	})
+
+	form.AddDropDown("Type", columnTypes, selectedTypeIndex, func(option string, index int) {
+		newType = option
+	})
+
+	form.AddCheckbox("Primary Key", column.IsPrimaryKey, func(checked bool) {
+		newIsPK = checked
+	})
+
+	form.AddCheckbox("Not Null", column.NotNull, func(checked bool) {
+		newIsNotNull = checked
+	})
+
+	defaultStr := ""
+	if column.Default != nil {
+		defaultStr = fmt.Sprintf("%v", column.Default)
+	}
+	form.AddInputField("Default Value", defaultStr, 40, nil, func(value string) {
+		newDefault = value
+	})
+
+	form.AddTextArea("Description", column.Description, 40, 5, 0, func(value string) {
+		newDescription = value
+	})
+
+	form.AddInputField("GUID", column.GUID, 40, nil, func(value string) {
+		newGUID = value
+	})
+
+	form.AddButton("Save", func() {
+		// Apply changes using dataops
+		se.UpdateColumn(schemaIndex, tableIndex, originalName, newName, newType, newIsPK, newIsNotNull, newDefault, newDescription)
+		se.db.Schemas[schemaIndex].Tables[tableIndex].Columns[newName].GUID = newGUID
+
+		se.pages.RemovePage("column-editor")
+		se.pages.SwitchToPage("table-editor")
+	})
+
+	form.AddButton("Delete", func() {
+		se.showDeleteColumnConfirm(schemaIndex, tableIndex, originalName)
+	})
+
+	form.AddButton("Back", func() {
+		// Discard changes - don't apply them
+		se.pages.RemovePage("column-editor")
+		se.pages.SwitchToPage("table-editor")
+	})
+
+	form.SetBorder(true).SetTitle(" Edit Column ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("column-editor", "table-editor")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("column-editor", form, true, true)
+}
+
+// showNewColumnDialog shows dialog to create a new column
+func (se *SchemaEditor) showNewColumnDialog(schemaIndex, tableIndex int) {
+	form := tview.NewForm()
+
+	columnName := ""
+	dataType := "VARCHAR(255)"
+
+	// Column type options: PostgreSQL, MySQL, SQL Server, and common SQL types
+	columnTypes := []string{
+		// Numeric Types
+		"SMALLINT", "INTEGER", "BIGINT", "INT", "TINYINT", "FLOAT", "REAL", "DOUBLE PRECISION",
+		"DECIMAL(10,2)", "NUMERIC", "DECIMAL", "NUMERIC(10,2)",
+		// Character Types
+		"CHAR", "VARCHAR", "VARCHAR(255)", "TEXT", "NCHAR", "NVARCHAR", "NVARCHAR(255)",
+		// Boolean
+		"BOOLEAN", "BOOL", "BIT",
+		// Date/Time Types
+		"DATE", "TIME", "TIMESTAMP", "TIMESTAMP WITH TIME ZONE", "INTERVAL",
+		"DATETIME", "DATETIME2", "DATEFIRST",
+		// UUID and JSON
+		"UUID", "GUID", "JSON", "JSONB",
+		// Binary Types
+		"BYTEA", "BLOB", "IMAGE", "VARBINARY", "VARBINARY(MAX)", "BINARY",
+		// PostgreSQL Special Types
+		"int4range", "int8range", "numrange", "tsrange", "tstzrange", "daterange",
+		"HSTORE", "CITEXT", "INET", "MACADDR", "POINT", "LINE", "LSEG", "BOX", "PATH", "POLYGON", "CIRCLE",
+		// Array Types
+		"INTEGER ARRAY", "VARCHAR ARRAY", "TEXT ARRAY", "BIGINT ARRAY",
+		// MySQL Specific
+		"MEDIUMINT", "DOUBLE", "FLOAT(10,2)",
+		// SQL Server Specific
+		"MONEY", "SMALLMONEY", "SQL_VARIANT",
+	}
+	selectedTypeIndex := 0
+
+	form.AddInputField("Column Name", "", 40, nil, func(value string) {
+		columnName = value
+	})
+
+	form.AddDropDown("Data Type", columnTypes, selectedTypeIndex, func(option string, index int) {
+		dataType = option
+	})
+
+	form.AddCheckbox("Primary Key", false, nil)
+	form.AddCheckbox("Not Null", false, nil)
+	form.AddCheckbox("Unique", false, nil)
+
+	form.AddButton("Save", func() {
+		if columnName == "" {
+			return
+		}
+
+		// Get form values
+		isPK := form.GetFormItemByLabel("Primary Key").(*tview.Checkbox).IsChecked()
+		isNotNull := form.GetFormItemByLabel("Not Null").(*tview.Checkbox).IsChecked()
+
+		se.CreateColumn(schemaIndex, tableIndex, columnName, dataType, isPK, isNotNull)
+
+		table := se.db.Schemas[schemaIndex].Tables[tableIndex]
+		se.pages.RemovePage("new-column")
+		se.pages.RemovePage("table-editor")
+		se.showTableEditor(schemaIndex, tableIndex, table)
+	})
+
+	form.AddButton("Back", func() {
+		table := se.db.Schemas[schemaIndex].Tables[tableIndex]
+		se.pages.RemovePage("new-column")
+		se.pages.RemovePage("table-editor")
+		se.showTableEditor(schemaIndex, tableIndex, table)
+	})
+
+	form.SetBorder(true).SetTitle(" New Column ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("new-column", "table-editor")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("new-column", form, true, true)
+}

pkg/ui/database_dataops.go

@@ -0,0 +1,15 @@
+package ui
+
+import (
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// updateDatabase updates database properties
+func (se *SchemaEditor) updateDatabase(name, description, comment, dbType, dbVersion string) {
+	se.db.Name = name
+	se.db.Description = description
+	se.db.Comment = comment
+	se.db.DatabaseType = models.DatabaseType(dbType)
+	se.db.DatabaseVersion = dbVersion
+	se.db.UpdateDate()
+}

pkg/ui/database_screens.go

@@ -0,0 +1,78 @@
+package ui
+
+import (
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+// showEditDatabaseForm displays a dialog to edit database properties
+func (se *SchemaEditor) showEditDatabaseForm() {
+	form := tview.NewForm()
+
+	dbName := se.db.Name
+	dbDescription := se.db.Description
+	dbComment := se.db.Comment
+	dbType := string(se.db.DatabaseType)
+	dbVersion := se.db.DatabaseVersion
+	dbGUID := se.db.GUID
+
+	// Database type options
+	dbTypeOptions := []string{"pgsql", "mssql", "sqlite"}
+	selectedTypeIndex := 0
+	for i, opt := range dbTypeOptions {
+		if opt == dbType {
+			selectedTypeIndex = i
+			break
+		}
+	}
+
+	form.AddInputField("Database Name", dbName, 40, nil, func(value string) {
+		dbName = value
+	})
+
+	form.AddInputField("Description", dbDescription, 50, nil, func(value string) {
+		dbDescription = value
+	})
+
+	form.AddInputField("Comment", dbComment, 50, nil, func(value string) {
+		dbComment = value
+	})
+
+	form.AddDropDown("Database Type", dbTypeOptions, selectedTypeIndex, func(option string, index int) {
+		dbType = option
+	})
+
+	form.AddInputField("Database Version", dbVersion, 20, nil, func(value string) {
+		dbVersion = value
+	})
+
+	form.AddInputField("GUID", dbGUID, 40, nil, func(value string) {
+		dbGUID = value
+	})
+
+	form.AddButton("Save", func() {
+		if dbName == "" {
+			return
+		}
+		se.updateDatabase(dbName, dbDescription, dbComment, dbType, dbVersion)
+		se.db.GUID = dbGUID
+		se.pages.RemovePage("edit-database")
+		se.pages.RemovePage("main")
+		se.pages.AddPage("main", se.createMainMenu(), true, true)
+	})
+
+	form.AddButton("Back", func() {
+		se.pages.RemovePage("edit-database")
+	})
+
+	form.SetBorder(true).SetTitle(" Edit Database ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("edit-database", "main")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("edit-database", form, true, true)
+}

pkg/ui/dialogs.go

@@ -0,0 +1,139 @@
+package ui
+
+import (
+	"fmt"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+// showExitConfirmation shows a confirmation dialog when trying to exit without saving
+func (se *SchemaEditor) showExitConfirmation(pageToRemove, pageToSwitchTo string) {
+	modal := tview.NewModal().
+		SetText("Exit without saving changes?").
+		AddButtons([]string{"Cancel", "No, exit without saving"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "No, exit without saving" {
+				se.pages.RemovePage(pageToRemove)
+				se.pages.SwitchToPage(pageToSwitchTo)
+			}
+			se.pages.RemovePage("exit-confirm")
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("exit-confirm")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("exit-confirm", modal, true, true)
+}
+
+// showExitEditorConfirm shows confirmation dialog when trying to exit the entire editor
+func (se *SchemaEditor) showExitEditorConfirm() {
+	modal := tview.NewModal().
+		SetText("Exit RelSpec Editor? Press ESC again to confirm.").
+		AddButtons([]string{"Cancel", "Exit"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Exit" {
+				se.app.Stop()
+			}
+			se.pages.RemovePage("exit-editor-confirm")
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.app.Stop()
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("exit-editor-confirm", modal, true, true)
+}
+
+// showDeleteSchemaConfirm shows confirmation dialog for schema deletion
+func (se *SchemaEditor) showDeleteSchemaConfirm(schemaIndex int) {
+	modal := tview.NewModal().
+		SetText(fmt.Sprintf("Delete schema '%s'? This will delete all tables in this schema.",
+			se.db.Schemas[schemaIndex].Name)).
+		AddButtons([]string{"Cancel", "Delete"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Delete" {
+				se.DeleteSchema(schemaIndex)
+				se.pages.RemovePage("schema-editor")
+				se.pages.RemovePage("schemas")
+				se.showSchemaList()
+			}
+			se.pages.RemovePage("confirm-delete-schema")
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("confirm-delete-schema")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("confirm-delete-schema", modal, true, true)
+}
+
+// showDeleteTableConfirm shows confirmation dialog for table deletion
+func (se *SchemaEditor) showDeleteTableConfirm(schemaIndex, tableIndex int) {
+	table := se.db.Schemas[schemaIndex].Tables[tableIndex]
+	modal := tview.NewModal().
+		SetText(fmt.Sprintf("Delete table '%s'? This action cannot be undone.",
+			table.Name)).
+		AddButtons([]string{"Cancel", "Delete"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Delete" {
+				se.DeleteTable(schemaIndex, tableIndex)
+				schema := se.db.Schemas[schemaIndex]
+				se.pages.RemovePage("table-editor")
+				se.pages.RemovePage("schema-editor")
+				se.showSchemaEditor(schemaIndex, schema)
+			}
+			se.pages.RemovePage("confirm-delete-table")
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("confirm-delete-table")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("confirm-delete-table", modal, true, true)
+}
+
+// showDeleteColumnConfirm shows confirmation dialog for column deletion
+func (se *SchemaEditor) showDeleteColumnConfirm(schemaIndex, tableIndex int, columnName string) {
+	modal := tview.NewModal().
+		SetText(fmt.Sprintf("Delete column '%s'? This action cannot be undone.",
+			columnName)).
+		AddButtons([]string{"Cancel", "Delete"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Delete" {
+				se.DeleteColumn(schemaIndex, tableIndex, columnName)
+				se.pages.RemovePage("column-editor")
+				se.pages.RemovePage("confirm-delete-column")
+				se.pages.SwitchToPage("table-editor")
+			} else {
+				se.pages.RemovePage("confirm-delete-column")
+			}
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("confirm-delete-column")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("confirm-delete-column", modal, true, true)
+}

pkg/ui/doc.go

@@ -0,0 +1,57 @@
+// Package ui provides an interactive terminal user interface (TUI) for editing database schemas.
+//
+// # Overview
+//
+// The ui package implements a full-featured terminal-based schema editor using tview,
+// allowing users to visually create, modify, and manage database schemas without writing
+// code or SQL.
+//
+// # Features
+//
+// The schema editor supports:
+//   - Database management: Edit name, description, and properties
+//   - Schema management: Create, edit, delete schemas
+//   - Table management: Create, edit, delete tables
+//   - Column management: Add, modify, delete columns with full property support
+//   - Relationship management: Define and edit table relationships
+//   - Domain management: Organize tables into logical domains
+//   - Import & merge: Combine schemas from multiple sources
+//   - Save: Export to any supported format
+//
+// # Architecture
+//
+// The package is organized into several components:
+//   - editor.go: Main editor and application lifecycle
+//   - *_screens.go: UI screens for each entity type
+//   - *_dataops.go: Business logic and data operations
+//   - dialogs.go: Reusable dialog components
+//   - load_save_screens.go: File I/O and format selection
+//   - main_menu.go: Primary navigation menu
+//
+// # Usage
+//
+//	editor := ui.NewSchemaEditor(database)
+//	if err := editor.Run(); err != nil {
+//	    log.Fatal(err)
+//	}
+//
+// Or with pre-configured load/save options:
+//
+//	editor := ui.NewSchemaEditorWithConfigs(database, loadConfig, saveConfig)
+//	if err := editor.Run(); err != nil {
+//	    log.Fatal(err)
+//	}
+//
+// # Navigation
+//
+//   - Arrow keys: Navigate between items
+//   - Enter: Select/edit item
+//   - Tab/Shift+Tab: Navigate between buttons
+//   - Escape: Go back/cancel
+//   - Letter shortcuts: Quick actions (e.g., 'n' for new, 'e' for edit, 'd' for delete)
+//
+// # Integration
+//
+// The editor integrates with all readers and writers, supporting load/save operations
+// for any format supported by RelSpec (DBML, PostgreSQL, GORM, Prisma, etc.).
+package ui

pkg/ui/domain_dataops.go

@@ -0,0 +1,35 @@
+package ui
+
+import (
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// createDomain creates a new domain
+func (se *SchemaEditor) createDomain(name, description string) {
+	domain := &models.Domain{
+		Name:        name,
+		Description: description,
+		Tables:      make([]*models.DomainTable, 0),
+		Sequence:    uint(len(se.db.Domains)),
+	}
+
+	se.db.Domains = append(se.db.Domains, domain)
+	se.showDomainList()
+}
+
+// updateDomain updates an existing domain
+func (se *SchemaEditor) updateDomain(index int, name, description string) {
+	if index >= 0 && index < len(se.db.Domains) {
+		se.db.Domains[index].Name = name
+		se.db.Domains[index].Description = description
+		se.showDomainList()
+	}
+}
+
+// deleteDomain deletes a domain by index
+func (se *SchemaEditor) deleteDomain(index int) {
+	if index >= 0 && index < len(se.db.Domains) {
+		se.db.Domains = append(se.db.Domains[:index], se.db.Domains[index+1:]...)
+		se.showDomainList()
+	}
+}

pkg/ui/domain_screens.go

@@ -0,0 +1,258 @@
+package ui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// showDomainList displays the domain management screen
+func (se *SchemaEditor) showDomainList() {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText("[::b]Manage Domains").
+		SetDynamicColors(true).
+		SetTextAlign(tview.AlignCenter)
+
+	// Create domains table
+	domainTable := tview.NewTable().SetBorders(true).SetSelectable(true, false).SetFixed(1, 0)
+
+	// Add header row
+	headers := []string{"Name", "Sequence", "Total Tables", "Description"}
+	headerWidths := []int{20, 15, 20}
+	for i, header := range headers {
+		padding := ""
+		if i < len(headerWidths) {
+			padding = strings.Repeat(" ", headerWidths[i]-len(header))
+		}
+		cell := tview.NewTableCell(header + padding).
+			SetTextColor(tcell.ColorYellow).
+			SetSelectable(false).
+			SetAlign(tview.AlignLeft)
+		domainTable.SetCell(0, i, cell)
+	}
+
+	// Add existing domains
+	for row, domain := range se.db.Domains {
+		domain := domain // capture for closure
+
+		// Name - pad to 20 chars
+		nameStr := fmt.Sprintf("%-20s", domain.Name)
+		nameCell := tview.NewTableCell(nameStr).SetSelectable(true)
+		domainTable.SetCell(row+1, 0, nameCell)
+
+		// Sequence - pad to 15 chars
+		seqStr := fmt.Sprintf("%-15s", fmt.Sprintf("%d", domain.Sequence))
+		seqCell := tview.NewTableCell(seqStr).SetSelectable(true)
+		domainTable.SetCell(row+1, 1, seqCell)
+
+		// Total Tables - pad to 20 chars
+		tablesStr := fmt.Sprintf("%-20s", fmt.Sprintf("%d", len(domain.Tables)))
+		tablesCell := tview.NewTableCell(tablesStr).SetSelectable(true)
+		domainTable.SetCell(row+1, 2, tablesCell)
+
+		// Description - no padding, takes remaining space
+		descCell := tview.NewTableCell(domain.Description).SetSelectable(true)
+		domainTable.SetCell(row+1, 3, descCell)
+	}
+
+	domainTable.SetTitle(" Domains ").SetBorder(true).SetTitleAlign(tview.AlignLeft)
+
+	// Action buttons flex
+	btnFlex := tview.NewFlex()
+	btnNewDomain := tview.NewButton("New Domain [n]").SetSelectedFunc(func() {
+		se.showNewDomainDialog()
+	})
+	btnBack := tview.NewButton("Back [b]").SetSelectedFunc(func() {
+		se.pages.SwitchToPage("main")
+		se.pages.RemovePage("domains")
+	})
+
+	// Set up button input captures for Tab/Shift+Tab navigation
+	btnNewDomain.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(domainTable)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnBack)
+			return nil
+		}
+		return event
+	})
+
+	btnBack.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnNewDomain)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(domainTable)
+			return nil
+		}
+		return event
+	})
+
+	btnFlex.AddItem(btnNewDomain, 0, 1, true).
+		AddItem(btnBack, 0, 1, false)
+
+	domainTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.SwitchToPage("main")
+			se.pages.RemovePage("domains")
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnNewDomain)
+			return nil
+		}
+		if event.Key() == tcell.KeyEnter {
+			row, _ := domainTable.GetSelection()
+			if row > 0 && row <= len(se.db.Domains) { // Skip header row
+				domainIndex := row - 1
+				se.showDomainEditor(domainIndex, se.db.Domains[domainIndex])
+				return nil
+			}
+		}
+		if event.Rune() == 'n' {
+			se.showNewDomainDialog()
+			return nil
+		}
+		if event.Rune() == 'b' {
+			se.pages.SwitchToPage("main")
+			se.pages.RemovePage("domains")
+			return nil
+		}
+		return event
+	})
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(domainTable, 0, 1, true).
+		AddItem(btnFlex, 1, 0, false)
+
+	se.pages.AddPage("domains", flex, true, true)
+}
+
+// showNewDomainDialog displays a dialog to create a new domain
+func (se *SchemaEditor) showNewDomainDialog() {
+	form := tview.NewForm()
+
+	domainName := ""
+	domainDesc := ""
+
+	form.AddInputField("Name", "", 40, nil, func(value string) {
+		domainName = value
+	})
+
+	form.AddInputField("Description", "", 50, nil, func(value string) {
+		domainDesc = value
+	})
+
+	form.AddButton("Save", func() {
+		if domainName == "" {
+			return
+		}
+		se.createDomain(domainName, domainDesc)
+		se.pages.RemovePage("new-domain")
+		se.pages.RemovePage("domains")
+		se.showDomainList()
+	})
+
+	form.AddButton("Back", func() {
+		se.pages.RemovePage("new-domain")
+		se.pages.RemovePage("domains")
+		se.showDomainList()
+	})
+
+	form.SetBorder(true).SetTitle(" New Domain ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("new-domain", "domains")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("new-domain", form, true, true)
+}
+
+// showDomainEditor displays a dialog to edit an existing domain
+func (se *SchemaEditor) showDomainEditor(index int, domain *models.Domain) {
+	form := tview.NewForm()
+
+	domainName := domain.Name
+	domainDesc := domain.Description
+
+	form.AddInputField("Name", domainName, 40, nil, func(value string) {
+		domainName = value
+	})
+
+	form.AddInputField("Description", domainDesc, 50, nil, func(value string) {
+		domainDesc = value
+	})
+
+	form.AddButton("Save", func() {
+		if domainName == "" {
+			return
+		}
+		se.updateDomain(index, domainName, domainDesc)
+		se.pages.RemovePage("edit-domain")
+		se.pages.RemovePage("domains")
+		se.showDomainList()
+	})
+
+	form.AddButton("Delete", func() {
+		se.showDeleteDomainConfirm(index)
+	})
+
+	form.AddButton("Back", func() {
+		se.pages.RemovePage("edit-domain")
+		se.pages.RemovePage("domains")
+		se.showDomainList()
+	})
+
+	form.SetBorder(true).SetTitle(" Edit Domain ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("edit-domain", "domains")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("edit-domain", form, true, true)
+}
+
+// showDeleteDomainConfirm shows a confirmation dialog before deleting a domain
+func (se *SchemaEditor) showDeleteDomainConfirm(index int) {
+	modal := tview.NewModal().
+		SetText(fmt.Sprintf("Delete domain '%s'? This action cannot be undone.", se.db.Domains[index].Name)).
+		AddButtons([]string{"Cancel", "Delete"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Delete" {
+				se.deleteDomain(index)
+				se.pages.RemovePage("delete-domain-confirm")
+				se.pages.RemovePage("edit-domain")
+				se.pages.RemovePage("domains")
+				se.showDomainList()
+			} else {
+				se.pages.RemovePage("delete-domain-confirm")
+			}
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("delete-domain-confirm")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddAndSwitchToPage("delete-domain-confirm", modal, true)
+}

pkg/ui/editor.go

@@ -0,0 +1,73 @@
+package ui
+
+import (
+	"fmt"
+
+	"github.com/rivo/tview"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// SchemaEditor represents the interactive schema editor
+type SchemaEditor struct {
+	db         *models.Database
+	app        *tview.Application
+	pages      *tview.Pages
+	loadConfig *LoadConfig
+	saveConfig *SaveConfig
+}
+
+// NewSchemaEditor creates a new schema editor
+func NewSchemaEditor(db *models.Database) *SchemaEditor {
+	return &SchemaEditor{
+		db:         db,
+		app:        tview.NewApplication(),
+		pages:      tview.NewPages(),
+		loadConfig: nil,
+		saveConfig: nil,
+	}
+}
+
+// NewSchemaEditorWithConfigs creates a new schema editor with load/save configurations
+func NewSchemaEditorWithConfigs(db *models.Database, loadConfig *LoadConfig, saveConfig *SaveConfig) *SchemaEditor {
+	return &SchemaEditor{
+		db:         db,
+		app:        tview.NewApplication(),
+		pages:      tview.NewPages(),
+		loadConfig: loadConfig,
+		saveConfig: saveConfig,
+	}
+}
+
+// Run starts the interactive editor
+func (se *SchemaEditor) Run() error {
+	// If no database is loaded, show load screen
+	if se.db == nil {
+		se.showLoadScreen()
+	} else {
+		// Create main menu view
+		mainMenu := se.createMainMenu()
+		se.pages.AddPage("main", mainMenu, true, true)
+	}
+
+	// Run the application
+	if err := se.app.SetRoot(se.pages, true).Run(); err != nil {
+		return fmt.Errorf("application error: %w", err)
+	}
+
+	return nil
+}
+
+// GetDatabase returns the current database
+func (se *SchemaEditor) GetDatabase() *models.Database {
+	return se.db
+}
+
+// Helper function to get sorted column names
+func getColumnNames(table *models.Table) []string {
+	names := make([]string, 0, len(table.Columns))
+	for name := range table.Columns {
+		names = append(names, name)
+	}
+	return names
+}

pkg/ui/load_save_screens.go

@@ -0,0 +1,791 @@
+package ui
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/merge"
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+	rbun "git.warky.dev/wdevs/relspecgo/pkg/readers/bun"
+	rdbml "git.warky.dev/wdevs/relspecgo/pkg/readers/dbml"
+	rdctx "git.warky.dev/wdevs/relspecgo/pkg/readers/dctx"
+	rdrawdb "git.warky.dev/wdevs/relspecgo/pkg/readers/drawdb"
+	rdrizzle "git.warky.dev/wdevs/relspecgo/pkg/readers/drizzle"
+	rgorm "git.warky.dev/wdevs/relspecgo/pkg/readers/gorm"
+	rgraphql "git.warky.dev/wdevs/relspecgo/pkg/readers/graphql"
+	rjson "git.warky.dev/wdevs/relspecgo/pkg/readers/json"
+	rpgsql "git.warky.dev/wdevs/relspecgo/pkg/readers/pgsql"
+	rprisma "git.warky.dev/wdevs/relspecgo/pkg/readers/prisma"
+	rtypeorm "git.warky.dev/wdevs/relspecgo/pkg/readers/typeorm"
+	ryaml "git.warky.dev/wdevs/relspecgo/pkg/readers/yaml"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+	wbun "git.warky.dev/wdevs/relspecgo/pkg/writers/bun"
+	wdbml "git.warky.dev/wdevs/relspecgo/pkg/writers/dbml"
+	wdctx "git.warky.dev/wdevs/relspecgo/pkg/writers/dctx"
+	wdrawdb "git.warky.dev/wdevs/relspecgo/pkg/writers/drawdb"
+	wdrizzle "git.warky.dev/wdevs/relspecgo/pkg/writers/drizzle"
+	wgorm "git.warky.dev/wdevs/relspecgo/pkg/writers/gorm"
+	wgraphql "git.warky.dev/wdevs/relspecgo/pkg/writers/graphql"
+	wjson "git.warky.dev/wdevs/relspecgo/pkg/writers/json"
+	wpgsql "git.warky.dev/wdevs/relspecgo/pkg/writers/pgsql"
+	wprisma "git.warky.dev/wdevs/relspecgo/pkg/writers/prisma"
+	wtypeorm "git.warky.dev/wdevs/relspecgo/pkg/writers/typeorm"
+	wyaml "git.warky.dev/wdevs/relspecgo/pkg/writers/yaml"
+)
+
+// LoadConfig holds the configuration for loading a database
+type LoadConfig struct {
+	SourceType string
+	FilePath   string
+	ConnString string
+}
+
+// SaveConfig holds the configuration for saving a database
+type SaveConfig struct {
+	TargetType string
+	FilePath   string
+	ConnString string
+}
+
+// showLoadScreen displays the database load screen
+func (se *SchemaEditor) showLoadScreen() {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText("[::b]Load Database Schema").
+		SetTextAlign(tview.AlignCenter).
+		SetDynamicColors(true)
+
+	// Form
+	form := tview.NewForm()
+	form.SetBorder(true).SetTitle(" Load Configuration ").SetTitleAlign(tview.AlignLeft)
+
+	// Format selection
+	formatOptions := []string{
+		"dbml", "dctx", "drawdb", "graphql", "json", "yaml",
+		"gorm", "bun", "drizzle", "prisma", "typeorm", "pgsql",
+	}
+	selectedFormat := 0
+	currentFormat := formatOptions[selectedFormat]
+
+	// File path input
+	filePath := ""
+	connString := ""
+
+	form.AddDropDown("Format", formatOptions, 0, func(option string, index int) {
+		selectedFormat = index
+		currentFormat = option
+	})
+
+	form.AddInputField("File Path", "", 50, nil, func(value string) {
+		filePath = value
+	})
+
+	form.AddInputField("Connection String", "", 50, nil, func(value string) {
+		connString = value
+	})
+
+	form.AddTextView("Help", getLoadHelpText(), 0, 5, true, false)
+
+	// Buttons
+	form.AddButton("Load [l]", func() {
+		se.loadDatabase(currentFormat, filePath, connString)
+	})
+
+	form.AddButton("Create New [n]", func() {
+		se.createNewDatabase()
+	})
+
+	form.AddButton("Exit [q]", func() {
+		se.app.Stop()
+	})
+
+	// Keyboard shortcuts
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.app.Stop()
+			return nil
+		}
+		switch event.Rune() {
+		case 'l':
+			se.loadDatabase(currentFormat, filePath, connString)
+			return nil
+		case 'n':
+			se.createNewDatabase()
+			return nil
+		case 'q':
+			se.app.Stop()
+			return nil
+		}
+		return event
+	})
+
+	// Tab navigation
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.app.Stop()
+			return nil
+		}
+		if event.Rune() == 'l' || event.Rune() == 'n' || event.Rune() == 'q' {
+			return event
+		}
+		return event
+	})
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(form, 0, 1, true)
+
+	se.pages.AddAndSwitchToPage("load-database", flex, true)
+}
+
+// showSaveScreen displays the save database screen
+func (se *SchemaEditor) showSaveScreen() {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText("[::b]Save Database Schema").
+		SetTextAlign(tview.AlignCenter).
+		SetDynamicColors(true)
+
+	// Form
+	form := tview.NewForm()
+	form.SetBorder(true).SetTitle(" Save Configuration ").SetTitleAlign(tview.AlignLeft)
+
+	// Format selection
+	formatOptions := []string{
+		"dbml", "dctx", "drawdb", "graphql", "json", "yaml",
+		"gorm", "bun", "drizzle", "prisma", "typeorm", "pgsql",
+	}
+	selectedFormat := 0
+	currentFormat := formatOptions[selectedFormat]
+
+	// File path input
+	filePath := ""
+	if se.saveConfig != nil {
+		// Pre-populate with existing save config
+		for i, format := range formatOptions {
+			if format == se.saveConfig.TargetType {
+				selectedFormat = i
+				currentFormat = format
+				break
+			}
+		}
+		filePath = se.saveConfig.FilePath
+	}
+
+	form.AddDropDown("Format", formatOptions, selectedFormat, func(option string, index int) {
+		selectedFormat = index
+		currentFormat = option
+	})
+
+	form.AddInputField("File Path", filePath, 50, nil, func(value string) {
+		filePath = value
+	})
+
+	form.AddTextView("Help", getSaveHelpText(), 0, 5, true, false)
+
+	// Buttons
+	form.AddButton("Save [s]", func() {
+		se.saveDatabase(currentFormat, filePath)
+	})
+
+	form.AddButton("Update Existing Database [u]", func() {
+		// Use saveConfig if available, otherwise use loadConfig
+		if se.saveConfig != nil {
+			se.showUpdateExistingDatabaseConfirm()
+		} else if se.loadConfig != nil {
+			se.showUpdateExistingDatabaseConfirm()
+		} else {
+			se.showErrorDialog("Error", "No database source found. Use Save instead.")
+		}
+	})
+
+	form.AddButton("Back [b]", func() {
+		se.pages.RemovePage("save-database")
+		se.pages.SwitchToPage("main")
+	})
+
+	// Keyboard shortcuts
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("save-database")
+			se.pages.SwitchToPage("main")
+			return nil
+		}
+		switch event.Rune() {
+		case 's':
+			se.saveDatabase(currentFormat, filePath)
+			return nil
+		case 'u':
+			// Use saveConfig if available, otherwise use loadConfig
+			if se.saveConfig != nil {
+				se.showUpdateExistingDatabaseConfirm()
+			} else if se.loadConfig != nil {
+				se.showUpdateExistingDatabaseConfirm()
+			} else {
+				se.showErrorDialog("Error", "No database source found. Use Save instead.")
+			}
+			return nil
+		case 'b':
+			se.pages.RemovePage("save-database")
+			se.pages.SwitchToPage("main")
+			return nil
+		}
+		return event
+	})
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(form, 0, 1, true)
+
+	se.pages.AddAndSwitchToPage("save-database", flex, true)
+}
+
+// loadDatabase loads a database from the specified configuration
+func (se *SchemaEditor) loadDatabase(format, filePath, connString string) {
+	// Validate input
+	if format == "pgsql" {
+		if connString == "" {
+			se.showErrorDialog("Error", "Connection string is required for PostgreSQL")
+			return
+		}
+	} else {
+		if filePath == "" {
+			se.showErrorDialog("Error", "File path is required for "+format)
+			return
+		}
+		// Expand home directory
+		if len(filePath) > 0 && filePath[0] == '~' {
+			home, err := os.UserHomeDir()
+			if err == nil {
+				filePath = filepath.Join(home, filePath[1:])
+			}
+		}
+	}
+
+	// Create reader
+	var reader readers.Reader
+	switch format {
+	case "dbml":
+		reader = rdbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "dctx":
+		reader = rdctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drawdb":
+		reader = rdrawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "graphql":
+		reader = rgraphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "json":
+		reader = rjson.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "yaml":
+		reader = ryaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "gorm":
+		reader = rgorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "bun":
+		reader = rbun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drizzle":
+		reader = rdrizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "prisma":
+		reader = rprisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "typeorm":
+		reader = rtypeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "pgsql":
+		reader = rpgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+	default:
+		se.showErrorDialog("Error", "Unsupported format: "+format)
+		return
+	}
+
+	// Read database
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		se.showErrorDialog("Load Error", fmt.Sprintf("Failed to load database: %v", err))
+		return
+	}
+
+	// Store load config
+	se.loadConfig = &LoadConfig{
+		SourceType: format,
+		FilePath:   filePath,
+		ConnString: connString,
+	}
+
+	// Update database
+	se.db = db
+
+	// Show success and switch to main menu
+	se.showSuccessDialog("Load Complete", fmt.Sprintf("Successfully loaded database '%s'", db.Name), func() {
+		se.pages.RemovePage("load-database")
+		se.pages.RemovePage("main")
+		se.pages.AddPage("main", se.createMainMenu(), true, true)
+	})
+}
+
+// saveDatabase saves the database to the specified configuration
+func (se *SchemaEditor) saveDatabase(format, filePath string) {
+	// Validate input
+	if format == "pgsql" {
+		se.showErrorDialog("Error", "Direct PostgreSQL save is not supported from the UI. Use --to pgsql --to-path output.sql")
+		return
+	}
+
+	if filePath == "" {
+		se.showErrorDialog("Error", "File path is required")
+		return
+	}
+
+	// Expand home directory
+	if len(filePath) > 0 && filePath[0] == '~' {
+		home, err := os.UserHomeDir()
+		if err == nil {
+			filePath = filepath.Join(home, filePath[1:])
+		}
+	}
+
+	// Create writer
+	var writer writers.Writer
+	switch format {
+	case "dbml":
+		writer = wdbml.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "dctx":
+		writer = wdctx.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "drawdb":
+		writer = wdrawdb.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "graphql":
+		writer = wgraphql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "json":
+		writer = wjson.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "yaml":
+		writer = wyaml.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "gorm":
+		writer = wgorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "bun":
+		writer = wbun.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "drizzle":
+		writer = wdrizzle.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "prisma":
+		writer = wprisma.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "typeorm":
+		writer = wtypeorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	case "pgsql":
+		writer = wpgsql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+	default:
+		se.showErrorDialog("Error", "Unsupported format: "+format)
+		return
+	}
+
+	// Write database
+	err := writer.WriteDatabase(se.db)
+	if err != nil {
+		se.showErrorDialog("Save Error", fmt.Sprintf("Failed to save database: %v", err))
+		return
+	}
+
+	// Store save config
+	se.saveConfig = &SaveConfig{
+		TargetType: format,
+		FilePath:   filePath,
+	}
+
+	// Show success
+	se.showSuccessDialog("Save Complete", fmt.Sprintf("Successfully saved database to %s", filePath), func() {
+		se.pages.RemovePage("save-database")
+		se.pages.SwitchToPage("main")
+	})
+}
+
+// createNewDatabase creates a new empty database
+func (se *SchemaEditor) createNewDatabase() {
+	// Create a new empty database
+	se.db = &models.Database{
+		Name:    "New Database",
+		Schemas: []*models.Schema{},
+	}
+
+	// Clear load config
+	se.loadConfig = nil
+
+	// Show success and switch to main menu
+	se.showSuccessDialog("New Database", "Created new empty database", func() {
+		se.pages.RemovePage("load-database")
+		se.pages.AddPage("main", se.createMainMenu(), true, true)
+	})
+}
+
+// showErrorDialog displays an error dialog
+func (se *SchemaEditor) showErrorDialog(_title, message string) {
+	modal := tview.NewModal().
+		SetText(message).
+		AddButtons([]string{"OK"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			se.pages.RemovePage("error-dialog")
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("error-dialog")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("error-dialog", modal, true, true)
+}
+
+// showSuccessDialog displays a success dialog
+func (se *SchemaEditor) showSuccessDialog(_title, message string, onClose func()) {
+	modal := tview.NewModal().
+		SetText(message).
+		AddButtons([]string{"OK"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			se.pages.RemovePage("success-dialog")
+			if onClose != nil {
+				onClose()
+			}
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("success-dialog")
+			if onClose != nil {
+				onClose()
+			}
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("success-dialog", modal, true, true)
+}
+
+// getLoadHelpText returns the help text for the load screen
+func getLoadHelpText() string {
+	return `File-based formats: dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm
+Database formats: pgsql (requires connection string)
+
+Examples:
+  - File path: ~/schemas/mydb.dbml or /path/to/schema.json
+  - Connection: postgres://user:pass@localhost/dbname`
+}
+
+// showUpdateExistingDatabaseConfirm displays a confirmation dialog before updating existing database
+func (se *SchemaEditor) showUpdateExistingDatabaseConfirm() {
+	// Use saveConfig if available, otherwise use loadConfig
+	var targetType, targetPath string
+	if se.saveConfig != nil {
+		targetType = se.saveConfig.TargetType
+		targetPath = se.saveConfig.FilePath
+	} else if se.loadConfig != nil {
+		targetType = se.loadConfig.SourceType
+		targetPath = se.loadConfig.FilePath
+	} else {
+		return
+	}
+
+	confirmText := fmt.Sprintf("Update existing database?\n\nFormat: %s\nPath: %s\n\nThis will overwrite the source.",
+		targetType, targetPath)
+
+	modal := tview.NewModal().
+		SetText(confirmText).
+		AddButtons([]string{"Cancel", "Update"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Update" {
+				se.pages.RemovePage("update-confirm")
+				se.pages.RemovePage("save-database")
+				se.saveDatabase(targetType, targetPath)
+				se.pages.SwitchToPage("main")
+			} else {
+				se.pages.RemovePage("update-confirm")
+			}
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("update-confirm")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddAndSwitchToPage("update-confirm", modal, true)
+}
+
+// getSaveHelpText returns the help text for the save screen
+func getSaveHelpText() string {
+	return `File-based formats: dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm, pgsql (SQL export)
+
+Examples:
+  - File: ~/schemas/mydb.dbml
+  - Directory (for code formats): ./models/`
+}
+
+// showImportScreen displays the import/merge database screen
+func (se *SchemaEditor) showImportScreen() {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText("[::b]Import & Merge Database Schema").
+		SetTextAlign(tview.AlignCenter).
+		SetDynamicColors(true)
+
+	// Form
+	form := tview.NewForm()
+	form.SetBorder(true).SetTitle(" Import Configuration ").SetTitleAlign(tview.AlignLeft)
+
+	// Format selection
+	formatOptions := []string{
+		"dbml", "dctx", "drawdb", "graphql", "json", "yaml",
+		"gorm", "bun", "drizzle", "prisma", "typeorm", "pgsql",
+	}
+	selectedFormat := 0
+	currentFormat := formatOptions[selectedFormat]
+
+	// File path input
+	filePath := ""
+	connString := ""
+	skipDomains := false
+	skipRelations := false
+	skipEnums := false
+	skipViews := false
+	skipSequences := false
+	skipTables := ""
+
+	form.AddDropDown("Format", formatOptions, 0, func(option string, index int) {
+		selectedFormat = index
+		currentFormat = option
+	})
+
+	form.AddInputField("File Path", "", 50, nil, func(value string) {
+		filePath = value
+	})
+
+	form.AddInputField("Connection String", "", 50, nil, func(value string) {
+		connString = value
+	})
+
+	form.AddInputField("Skip Tables (comma-separated)", "", 50, nil, func(value string) {
+		skipTables = value
+	})
+
+	form.AddCheckbox("Skip Domains", false, func(checked bool) {
+		skipDomains = checked
+	})
+
+	form.AddCheckbox("Skip Relations", false, func(checked bool) {
+		skipRelations = checked
+	})
+
+	form.AddCheckbox("Skip Enums", false, func(checked bool) {
+		skipEnums = checked
+	})
+
+	form.AddCheckbox("Skip Views", false, func(checked bool) {
+		skipViews = checked
+	})
+
+	form.AddCheckbox("Skip Sequences", false, func(checked bool) {
+		skipSequences = checked
+	})
+
+	form.AddTextView("Help", getImportHelpText(), 0, 7, true, false)
+
+	// Buttons
+	form.AddButton("Import & Merge [i]", func() {
+		se.importAndMergeDatabase(currentFormat, filePath, connString, skipDomains, skipRelations, skipEnums, skipViews, skipSequences, skipTables)
+	})
+
+	form.AddButton("Back [b]", func() {
+		se.pages.RemovePage("import-database")
+		se.pages.SwitchToPage("main")
+	})
+
+	form.AddButton("Exit [q]", func() {
+		se.app.Stop()
+	})
+
+	// Keyboard shortcuts
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("import-database")
+			se.pages.SwitchToPage("main")
+			return nil
+		}
+		switch event.Rune() {
+		case 'i':
+			se.importAndMergeDatabase(currentFormat, filePath, connString, skipDomains, skipRelations, skipEnums, skipViews, skipSequences, skipTables)
+			return nil
+		case 'b':
+			se.pages.RemovePage("import-database")
+			se.pages.SwitchToPage("main")
+			return nil
+		case 'q':
+			se.app.Stop()
+			return nil
+		}
+		return event
+	})
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(form, 0, 1, true)
+
+	se.pages.AddAndSwitchToPage("import-database", flex, true)
+}
+
+// importAndMergeDatabase imports and merges a database from the specified configuration
+func (se *SchemaEditor) importAndMergeDatabase(format, filePath, connString string, skipDomains, skipRelations, skipEnums, skipViews, skipSequences bool, skipTables string) {
+	// Validate input
+	if format == "pgsql" {
+		if connString == "" {
+			se.showErrorDialog("Error", "Connection string is required for PostgreSQL")
+			return
+		}
+	} else {
+		if filePath == "" {
+			se.showErrorDialog("Error", "File path is required for "+format)
+			return
+		}
+		// Expand home directory
+		if len(filePath) > 0 && filePath[0] == '~' {
+			home, err := os.UserHomeDir()
+			if err == nil {
+				filePath = filepath.Join(home, filePath[1:])
+			}
+		}
+	}
+
+	// Create reader
+	var reader readers.Reader
+	switch format {
+	case "dbml":
+		reader = rdbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "dctx":
+		reader = rdctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drawdb":
+		reader = rdrawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "graphql":
+		reader = rgraphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "json":
+		reader = rjson.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "yaml":
+		reader = ryaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "gorm":
+		reader = rgorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "bun":
+		reader = rbun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "drizzle":
+		reader = rdrizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "prisma":
+		reader = rprisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "typeorm":
+		reader = rtypeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+	case "pgsql":
+		reader = rpgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+	default:
+		se.showErrorDialog("Error", "Unsupported format: "+format)
+		return
+	}
+
+	// Read the database to import
+	importDb, err := reader.ReadDatabase()
+	if err != nil {
+		se.showErrorDialog("Import Error", fmt.Sprintf("Failed to read database: %v", err))
+		return
+	}
+
+	// Show confirmation dialog
+	se.showImportConfirmation(importDb, skipDomains, skipRelations, skipEnums, skipViews, skipSequences, skipTables)
+}
+
+// showImportConfirmation shows a confirmation dialog before merging
+func (se *SchemaEditor) showImportConfirmation(importDb *models.Database, skipDomains, skipRelations, skipEnums, skipViews, skipSequences bool, skipTables string) {
+	confirmText := fmt.Sprintf("Import & Merge Database?\n\nSource: %s\nTarget: %s\n\nThis will add missing schemas, tables, columns, and other objects from the source to your database.\n\nExisting items will NOT be modified.",
+		importDb.Name, se.db.Name)
+
+	modal := tview.NewModal().
+		SetText(confirmText).
+		AddButtons([]string{"Cancel", "Merge"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			se.pages.RemovePage("import-confirm")
+			if buttonLabel == "Merge" {
+				se.performMerge(importDb, skipDomains, skipRelations, skipEnums, skipViews, skipSequences, skipTables)
+			}
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("import-confirm")
+			se.pages.SwitchToPage("import-database")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddAndSwitchToPage("import-confirm", modal, true)
+}
+
+// performMerge performs the actual merge operation
+func (se *SchemaEditor) performMerge(importDb *models.Database, skipDomains, skipRelations, skipEnums, skipViews, skipSequences bool, skipTables string) {
+	// Create merge options
+	opts := &merge.MergeOptions{
+		SkipDomains:   skipDomains,
+		SkipRelations: skipRelations,
+		SkipEnums:     skipEnums,
+		SkipViews:     skipViews,
+		SkipSequences: skipSequences,
+	}
+
+	// Parse skip tables
+	if skipTables != "" {
+		opts.SkipTableNames = parseSkipTablesUI(skipTables)
+	}
+
+	// Perform the merge
+	result := merge.MergeDatabases(se.db, importDb, opts)
+
+	// Update the database timestamp
+	se.db.UpdateDate()
+
+	// Show success dialog with summary
+	summary := merge.GetMergeSummary(result)
+	se.showSuccessDialog("Import Complete", summary, func() {
+		se.pages.RemovePage("import-database")
+		se.pages.RemovePage("main")
+		se.pages.AddPage("main", se.createMainMenu(), true, true)
+	})
+}
+
+// getImportHelpText returns the help text for the import screen
+func getImportHelpText() string {
+	return `Import & Merge: Adds missing schemas, tables, columns, and other objects to your existing database.
+
+File-based formats: dbml, dctx, drawdb, graphql, json, yaml, gorm, bun, drizzle, prisma, typeorm
+Database formats: pgsql (requires connection string)
+
+Skip options: Check to exclude specific object types from the merge.`
+}
+
+func parseSkipTablesUI(skipTablesStr string) map[string]bool {
+	skipTables := make(map[string]bool)
+	if skipTablesStr == "" {
+		return skipTables
+	}
+
+	// Split by comma and trim whitespace
+	parts := strings.Split(skipTablesStr, ",")
+	for _, part := range parts {
+		trimmed := strings.TrimSpace(part)
+		if trimmed != "" {
+			// Store in lowercase for case-insensitive matching
+			skipTables[strings.ToLower(trimmed)] = true
+		}
+	}
+
+	return skipTables
+}

pkg/ui/main_menu.go

@@ -0,0 +1,65 @@
+package ui
+
+import (
+	"fmt"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+// createMainMenu creates the main menu screen
+func (se *SchemaEditor) createMainMenu() tview.Primitive {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title with database name
+	dbName := se.db.Name
+	if dbName == "" {
+		dbName = "Untitled"
+	}
+	updateAtStr := ""
+	if se.db.UpdatedAt != "" {
+		updateAtStr = fmt.Sprintf("Updated @ %s", se.db.UpdatedAt)
+	}
+	titleText := fmt.Sprintf("[::b]RelSpec Schema Editor\n[::d]Database: %s %s\n[::d]Press arrow keys to navigate, Enter to select", dbName, updateAtStr)
+	title := tview.NewTextView().
+		SetText(titleText).
+		SetDynamicColors(true)
+
+	// Menu options
+	menu := tview.NewList().
+		AddItem("Edit Database", "Edit database name, description, and properties", 'e', func() {
+			se.showEditDatabaseForm()
+		}).
+		AddItem("Manage Schemas", "View, create, edit, and delete schemas", 's', func() {
+			se.showSchemaList()
+		}).
+		AddItem("Manage Tables", "View and manage tables in schemas", 't', func() {
+			se.showTableList()
+		}).
+		AddItem("Manage Domains", "View, create, edit, and delete domains", 'd', func() {
+			se.showDomainList()
+		}).
+		AddItem("Import & Merge", "Import and merge schema from another database", 'i', func() {
+			se.showImportScreen()
+		}).
+		AddItem("Save Database", "Save database to file or database", 'w', func() {
+			se.showSaveScreen()
+		}).
+		AddItem("Exit Editor", "Exit the editor", 'q', func() {
+			se.app.Stop()
+		})
+
+	menu.SetBorder(true).SetTitle(" Menu ").SetTitleAlign(tview.AlignLeft)
+	menu.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitEditorConfirm()
+			return nil
+		}
+		return event
+	})
+
+	flex.AddItem(title, 5, 0, false).
+		AddItem(menu, 0, 1, true)
+
+	return flex
+}

pkg/ui/relation_dataops.go

@@ -0,0 +1,115 @@
+package ui
+
+import "git.warky.dev/wdevs/relspecgo/pkg/models"
+
+// Relationship data operations - business logic for relationship management
+
+// CreateRelationship creates a new relationship and adds it to a table
+func (se *SchemaEditor) CreateRelationship(schemaIndex, tableIndex int, rel *models.Relationship) *models.Relationship {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return nil
+	}
+
+	table := schema.Tables[tableIndex]
+	if table.Relationships == nil {
+		table.Relationships = make(map[string]*models.Relationship)
+	}
+
+	table.Relationships[rel.Name] = rel
+	table.UpdateDate()
+	return rel
+}
+
+// UpdateRelationship updates an existing relationship
+func (se *SchemaEditor) UpdateRelationship(schemaIndex, tableIndex int, oldName string, rel *models.Relationship) bool {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return false
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return false
+	}
+
+	table := schema.Tables[tableIndex]
+	if table.Relationships == nil {
+		return false
+	}
+
+	// Delete old entry if name changed
+	if oldName != rel.Name {
+		delete(table.Relationships, oldName)
+	}
+
+	table.Relationships[rel.Name] = rel
+	table.UpdateDate()
+	return true
+}
+
+// DeleteRelationship removes a relationship from a table
+func (se *SchemaEditor) DeleteRelationship(schemaIndex, tableIndex int, relName string) bool {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return false
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return false
+	}
+
+	table := schema.Tables[tableIndex]
+	if table.Relationships == nil {
+		return false
+	}
+
+	delete(table.Relationships, relName)
+	table.UpdateDate()
+	return true
+}
+
+// GetRelationship returns a relationship by name
+func (se *SchemaEditor) GetRelationship(schemaIndex, tableIndex int, relName string) *models.Relationship {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return nil
+	}
+
+	table := schema.Tables[tableIndex]
+	if table.Relationships == nil {
+		return nil
+	}
+
+	return table.Relationships[relName]
+}
+
+// GetRelationshipNames returns all relationship names for a table
+func (se *SchemaEditor) GetRelationshipNames(schemaIndex, tableIndex int) []string {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return nil
+	}
+
+	table := schema.Tables[tableIndex]
+	if table.Relationships == nil {
+		return nil
+	}
+
+	names := make([]string, 0, len(table.Relationships))
+	for name := range table.Relationships {
+		names = append(names, name)
+	}
+	return names
+}

pkg/ui/relation_screens.go

@@ -0,0 +1,486 @@
+package ui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// showRelationshipList displays all relationships for a table
+func (se *SchemaEditor) showRelationshipList(schemaIndex, tableIndex int) {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return
+	}
+
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText(fmt.Sprintf("[::b]Relationships for Table: %s", table.Name)).
+		SetDynamicColors(true).
+		SetTextAlign(tview.AlignCenter)
+
+	// Create relationships table
+	relTable := tview.NewTable().SetBorders(true).SetSelectable(true, false).SetFixed(1, 0)
+
+	// Add header row
+	headers := []string{"Name", "Type", "From Columns", "To Table", "To Columns", "Description"}
+	headerWidths := []int{20, 15, 20, 20, 20}
+	for i, header := range headers {
+		padding := ""
+		if i < len(headerWidths) {
+			padding = strings.Repeat(" ", headerWidths[i]-len(header))
+		}
+		cell := tview.NewTableCell(header + padding).
+			SetTextColor(tcell.ColorYellow).
+			SetSelectable(false).
+			SetAlign(tview.AlignLeft)
+		relTable.SetCell(0, i, cell)
+	}
+
+	// Get relationship names
+	relNames := se.GetRelationshipNames(schemaIndex, tableIndex)
+	for row, relName := range relNames {
+		rel := table.Relationships[relName]
+
+		// Name
+		nameStr := fmt.Sprintf("%-20s", rel.Name)
+		nameCell := tview.NewTableCell(nameStr).SetSelectable(true)
+		relTable.SetCell(row+1, 0, nameCell)
+
+		// Type
+		typeStr := fmt.Sprintf("%-15s", string(rel.Type))
+		typeCell := tview.NewTableCell(typeStr).SetSelectable(true)
+		relTable.SetCell(row+1, 1, typeCell)
+
+		// From Columns
+		fromColsStr := strings.Join(rel.FromColumns, ", ")
+		fromColsStr = fmt.Sprintf("%-20s", fromColsStr)
+		fromColsCell := tview.NewTableCell(fromColsStr).SetSelectable(true)
+		relTable.SetCell(row+1, 2, fromColsCell)
+
+		// To Table
+		toTableStr := rel.ToTable
+		if rel.ToSchema != "" && rel.ToSchema != table.Schema {
+			toTableStr = rel.ToSchema + "." + rel.ToTable
+		}
+		toTableStr = fmt.Sprintf("%-20s", toTableStr)
+		toTableCell := tview.NewTableCell(toTableStr).SetSelectable(true)
+		relTable.SetCell(row+1, 3, toTableCell)
+
+		// To Columns
+		toColsStr := strings.Join(rel.ToColumns, ", ")
+		toColsStr = fmt.Sprintf("%-20s", toColsStr)
+		toColsCell := tview.NewTableCell(toColsStr).SetSelectable(true)
+		relTable.SetCell(row+1, 4, toColsCell)
+
+		// Description
+		descCell := tview.NewTableCell(rel.Description).SetSelectable(true)
+		relTable.SetCell(row+1, 5, descCell)
+	}
+
+	relTable.SetTitle(" Relationships ").SetBorder(true).SetTitleAlign(tview.AlignLeft)
+
+	// Action buttons
+	btnFlex := tview.NewFlex()
+	btnNew := tview.NewButton("New Relationship [n]").SetSelectedFunc(func() {
+		se.showNewRelationshipDialog(schemaIndex, tableIndex)
+	})
+	btnEdit := tview.NewButton("Edit [e]").SetSelectedFunc(func() {
+		row, _ := relTable.GetSelection()
+		if row > 0 && row <= len(relNames) {
+			relName := relNames[row-1]
+			se.showEditRelationshipDialog(schemaIndex, tableIndex, relName)
+		}
+	})
+	btnDelete := tview.NewButton("Delete [d]").SetSelectedFunc(func() {
+		row, _ := relTable.GetSelection()
+		if row > 0 && row <= len(relNames) {
+			relName := relNames[row-1]
+			se.showDeleteRelationshipConfirm(schemaIndex, tableIndex, relName)
+		}
+	})
+	btnBack := tview.NewButton("Back [b]").SetSelectedFunc(func() {
+		se.pages.RemovePage("relationships")
+		se.pages.SwitchToPage("table-editor")
+	})
+
+	// Set up button navigation
+	btnNew.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(relTable)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnEdit)
+			return nil
+		}
+		return event
+	})
+
+	btnEdit.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnNew)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnDelete)
+			return nil
+		}
+		return event
+	})
+
+	btnDelete.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnEdit)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnBack)
+			return nil
+		}
+		return event
+	})
+
+	btnBack.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnDelete)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(relTable)
+			return nil
+		}
+		return event
+	})
+
+	btnFlex.AddItem(btnNew, 0, 1, true).
+		AddItem(btnEdit, 0, 1, false).
+		AddItem(btnDelete, 0, 1, false).
+		AddItem(btnBack, 0, 1, false)
+
+	relTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("relationships")
+			se.pages.SwitchToPage("table-editor")
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnNew)
+			return nil
+		}
+		if event.Key() == tcell.KeyEnter {
+			row, _ := relTable.GetSelection()
+			if row > 0 && row <= len(relNames) {
+				relName := relNames[row-1]
+				se.showEditRelationshipDialog(schemaIndex, tableIndex, relName)
+			}
+			return nil
+		}
+		if event.Rune() == 'n' {
+			se.showNewRelationshipDialog(schemaIndex, tableIndex)
+			return nil
+		}
+		if event.Rune() == 'e' {
+			row, _ := relTable.GetSelection()
+			if row > 0 && row <= len(relNames) {
+				relName := relNames[row-1]
+				se.showEditRelationshipDialog(schemaIndex, tableIndex, relName)
+			}
+			return nil
+		}
+		if event.Rune() == 'd' {
+			row, _ := relTable.GetSelection()
+			if row > 0 && row <= len(relNames) {
+				relName := relNames[row-1]
+				se.showDeleteRelationshipConfirm(schemaIndex, tableIndex, relName)
+			}
+			return nil
+		}
+		if event.Rune() == 'b' {
+			se.pages.RemovePage("relationships")
+			se.pages.SwitchToPage("table-editor")
+			return nil
+		}
+		return event
+	})
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(relTable, 0, 1, true).
+		AddItem(btnFlex, 1, 0, false)
+
+	se.pages.AddPage("relationships", flex, true, true)
+}
+
+// showNewRelationshipDialog shows dialog to create a new relationship
+func (se *SchemaEditor) showNewRelationshipDialog(schemaIndex, tableIndex int) {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return
+	}
+
+	form := tview.NewForm()
+
+	// Collect all tables for dropdown
+	var allTables []string
+	var tableMap []struct{ schemaIdx, tableIdx int }
+	for si, schema := range se.db.Schemas {
+		for ti, t := range schema.Tables {
+			tableName := t.Name
+			if schema.Name != table.Schema {
+				tableName = schema.Name + "." + t.Name
+			}
+			allTables = append(allTables, tableName)
+			tableMap = append(tableMap, struct{ schemaIdx, tableIdx int }{si, ti})
+		}
+	}
+
+	relName := ""
+	relType := models.OneToMany
+	fromColumns := ""
+	toColumns := ""
+	description := ""
+	selectedTableIdx := 0
+
+	form.AddInputField("Name", "", 40, nil, func(value string) {
+		relName = value
+	})
+
+	form.AddDropDown("Type", []string{
+		string(models.OneToOne),
+		string(models.OneToMany),
+		string(models.ManyToMany),
+	}, 1, func(option string, optionIndex int) {
+		relType = models.RelationType(option)
+	})
+
+	form.AddInputField("From Columns (comma-separated)", "", 40, nil, func(value string) {
+		fromColumns = value
+	})
+
+	form.AddDropDown("To Table", allTables, 0, func(option string, optionIndex int) {
+		selectedTableIdx = optionIndex
+	})
+
+	form.AddInputField("To Columns (comma-separated)", "", 40, nil, func(value string) {
+		toColumns = value
+	})
+
+	form.AddInputField("Description", "", 60, nil, func(value string) {
+		description = value
+	})
+
+	form.AddButton("Save", func() {
+		if relName == "" {
+			return
+		}
+
+		// Parse columns
+		fromCols := strings.Split(fromColumns, ",")
+		for i := range fromCols {
+			fromCols[i] = strings.TrimSpace(fromCols[i])
+		}
+
+		toCols := strings.Split(toColumns, ",")
+		for i := range toCols {
+			toCols[i] = strings.TrimSpace(toCols[i])
+		}
+
+		// Get target table
+		targetSchema := se.db.Schemas[tableMap[selectedTableIdx].schemaIdx]
+		targetTable := targetSchema.Tables[tableMap[selectedTableIdx].tableIdx]
+
+		rel := models.InitRelationship(relName, relType)
+		rel.FromTable = table.Name
+		rel.FromSchema = table.Schema
+		rel.FromColumns = fromCols
+		rel.ToTable = targetTable.Name
+		rel.ToSchema = targetTable.Schema
+		rel.ToColumns = toCols
+		rel.Description = description
+
+		se.CreateRelationship(schemaIndex, tableIndex, rel)
+
+		se.pages.RemovePage("new-relationship")
+		se.pages.RemovePage("relationships")
+		se.showRelationshipList(schemaIndex, tableIndex)
+	})
+
+	form.AddButton("Back", func() {
+		se.pages.RemovePage("new-relationship")
+	})
+
+	form.SetBorder(true).SetTitle(" New Relationship ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("new-relationship")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("new-relationship", form, true, true)
+}
+
+// showEditRelationshipDialog shows dialog to edit a relationship
+func (se *SchemaEditor) showEditRelationshipDialog(schemaIndex, tableIndex int, relName string) {
+	table := se.GetTable(schemaIndex, tableIndex)
+	if table == nil {
+		return
+	}
+
+	rel := se.GetRelationship(schemaIndex, tableIndex, relName)
+	if rel == nil {
+		return
+	}
+
+	form := tview.NewForm()
+
+	// Collect all tables for dropdown
+	var allTables []string
+	var tableMap []struct{ schemaIdx, tableIdx int }
+	selectedTableIdx := 0
+	for si, schema := range se.db.Schemas {
+		for ti, t := range schema.Tables {
+			tableName := t.Name
+			if schema.Name != table.Schema {
+				tableName = schema.Name + "." + t.Name
+			}
+			allTables = append(allTables, tableName)
+			tableMap = append(tableMap, struct{ schemaIdx, tableIdx int }{si, ti})
+
+			// Check if this is the current target table
+			if t.Name == rel.ToTable && schema.Name == rel.ToSchema {
+				selectedTableIdx = len(allTables) - 1
+			}
+		}
+	}
+
+	newName := rel.Name
+	relType := rel.Type
+	fromColumns := strings.Join(rel.FromColumns, ", ")
+	toColumns := strings.Join(rel.ToColumns, ", ")
+	description := rel.Description
+
+	form.AddInputField("Name", rel.Name, 40, nil, func(value string) {
+		newName = value
+	})
+
+	// Find initial type index
+	typeIdx := 1 // OneToMany default
+	typeOptions := []string{
+		string(models.OneToOne),
+		string(models.OneToMany),
+		string(models.ManyToMany),
+	}
+	for i, opt := range typeOptions {
+		if opt == string(rel.Type) {
+			typeIdx = i
+			break
+		}
+	}
+
+	form.AddDropDown("Type", typeOptions, typeIdx, func(option string, optionIndex int) {
+		relType = models.RelationType(option)
+	})
+
+	form.AddInputField("From Columns (comma-separated)", fromColumns, 40, nil, func(value string) {
+		fromColumns = value
+	})
+
+	form.AddDropDown("To Table", allTables, selectedTableIdx, func(option string, optionIndex int) {
+		selectedTableIdx = optionIndex
+	})
+
+	form.AddInputField("To Columns (comma-separated)", toColumns, 40, nil, func(value string) {
+		toColumns = value
+	})
+
+	form.AddInputField("Description", rel.Description, 60, nil, func(value string) {
+		description = value
+	})
+
+	form.AddButton("Save", func() {
+		if newName == "" {
+			return
+		}
+
+		// Parse columns
+		fromCols := strings.Split(fromColumns, ",")
+		for i := range fromCols {
+			fromCols[i] = strings.TrimSpace(fromCols[i])
+		}
+
+		toCols := strings.Split(toColumns, ",")
+		for i := range toCols {
+			toCols[i] = strings.TrimSpace(toCols[i])
+		}
+
+		// Get target table
+		targetSchema := se.db.Schemas[tableMap[selectedTableIdx].schemaIdx]
+		targetTable := targetSchema.Tables[tableMap[selectedTableIdx].tableIdx]
+
+		updatedRel := models.InitRelationship(newName, relType)
+		updatedRel.FromTable = table.Name
+		updatedRel.FromSchema = table.Schema
+		updatedRel.FromColumns = fromCols
+		updatedRel.ToTable = targetTable.Name
+		updatedRel.ToSchema = targetTable.Schema
+		updatedRel.ToColumns = toCols
+		updatedRel.Description = description
+		updatedRel.GUID = rel.GUID
+
+		se.UpdateRelationship(schemaIndex, tableIndex, relName, updatedRel)
+
+		se.pages.RemovePage("edit-relationship")
+		se.pages.RemovePage("relationships")
+		se.showRelationshipList(schemaIndex, tableIndex)
+	})
+
+	form.AddButton("Back", func() {
+		se.pages.RemovePage("edit-relationship")
+	})
+
+	form.SetBorder(true).SetTitle(" Edit Relationship ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("edit-relationship")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("edit-relationship", form, true, true)
+}
+
+// showDeleteRelationshipConfirm shows confirmation dialog for deleting a relationship
+func (se *SchemaEditor) showDeleteRelationshipConfirm(schemaIndex, tableIndex int, relName string) {
+	modal := tview.NewModal().
+		SetText(fmt.Sprintf("Delete relationship '%s'? This action cannot be undone.", relName)).
+		AddButtons([]string{"Cancel", "Delete"}).
+		SetDoneFunc(func(buttonIndex int, buttonLabel string) {
+			if buttonLabel == "Delete" {
+				se.DeleteRelationship(schemaIndex, tableIndex, relName)
+				se.pages.RemovePage("delete-relationship-confirm")
+				se.pages.RemovePage("relationships")
+				se.showRelationshipList(schemaIndex, tableIndex)
+			} else {
+				se.pages.RemovePage("delete-relationship-confirm")
+			}
+		})
+
+	modal.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("delete-relationship-confirm")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddAndSwitchToPage("delete-relationship-confirm", modal, true)
+}

pkg/ui/schema_dataops.go

@@ -0,0 +1,55 @@
+package ui
+
+import "git.warky.dev/wdevs/relspecgo/pkg/models"
+
+// Schema data operations - business logic for schema management
+
+// CreateSchema creates a new schema and adds it to the database
+func (se *SchemaEditor) CreateSchema(name, description string) *models.Schema {
+	newSchema := &models.Schema{
+		Name:        name,
+		Description: description,
+		Tables:      make([]*models.Table, 0),
+		Sequences:   make([]*models.Sequence, 0),
+		Enums:       make([]*models.Enum, 0),
+	}
+	se.db.UpdateDate()
+	se.db.Schemas = append(se.db.Schemas, newSchema)
+	return newSchema
+}
+
+// UpdateSchema updates an existing schema's properties
+func (se *SchemaEditor) UpdateSchema(schemaIndex int, name, owner, description string) {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return
+	}
+	se.db.UpdateDate()
+	schema := se.db.Schemas[schemaIndex]
+	schema.Name = name
+	schema.Owner = owner
+	schema.Description = description
+	schema.UpdateDate()
+}
+
+// DeleteSchema removes a schema from the database
+func (se *SchemaEditor) DeleteSchema(schemaIndex int) bool {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return false
+	}
+	se.db.UpdateDate()
+	se.db.Schemas = append(se.db.Schemas[:schemaIndex], se.db.Schemas[schemaIndex+1:]...)
+	return true
+}
+
+// GetSchema returns a schema by index
+func (se *SchemaEditor) GetSchema(schemaIndex int) *models.Schema {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+	return se.db.Schemas[schemaIndex]
+}
+
+// GetAllSchemas returns all schemas
+func (se *SchemaEditor) GetAllSchemas() []*models.Schema {
+	return se.db.Schemas
+}

pkg/ui/schema_screens.go

@@ -0,0 +1,362 @@
+package ui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+)
+
+// showSchemaList displays the schema management screen
+func (se *SchemaEditor) showSchemaList() {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText("[::b]Manage Schemas").
+		SetDynamicColors(true).
+		SetTextAlign(tview.AlignCenter)
+
+	// Create schemas table
+	schemaTable := tview.NewTable().SetBorders(true).SetSelectable(true, false).SetFixed(1, 0)
+
+	// Add header row with padding for full width
+	headers := []string{"Name", "Sequence", "Total Tables", "Total Sequences", "Total Views", "GUID", "Description"}
+	headerWidths := []int{20, 15, 20, 20, 15, 36} // Last column takes remaining space
+	for i, header := range headers {
+		padding := ""
+		if i < len(headerWidths) {
+			padding = strings.Repeat(" ", headerWidths[i]-len(header))
+		}
+		cell := tview.NewTableCell(header + padding).
+			SetTextColor(tcell.ColorYellow).
+			SetSelectable(false).
+			SetAlign(tview.AlignLeft)
+		schemaTable.SetCell(0, i, cell)
+	}
+
+	// Add existing schemas
+	for row, schema := range se.db.Schemas {
+		schema := schema // capture for closure
+
+		// Name - pad to 20 chars
+		nameStr := fmt.Sprintf("%-20s", schema.Name)
+		nameCell := tview.NewTableCell(nameStr).SetSelectable(true)
+		schemaTable.SetCell(row+1, 0, nameCell)
+
+		// Sequence - pad to 15 chars
+		seqStr := fmt.Sprintf("%-15s", fmt.Sprintf("%d", schema.Sequence))
+		seqCell := tview.NewTableCell(seqStr).SetSelectable(true)
+		schemaTable.SetCell(row+1, 1, seqCell)
+
+		// Total Tables - pad to 20 chars
+		tablesStr := fmt.Sprintf("%-20s", fmt.Sprintf("%d", len(schema.Tables)))
+		tablesCell := tview.NewTableCell(tablesStr).SetSelectable(true)
+		schemaTable.SetCell(row+1, 2, tablesCell)
+
+		// Total Sequences - pad to 20 chars
+		sequencesStr := fmt.Sprintf("%-20s", fmt.Sprintf("%d", len(schema.Sequences)))
+		sequencesCell := tview.NewTableCell(sequencesStr).SetSelectable(true)
+		schemaTable.SetCell(row+1, 3, sequencesCell)
+
+		// Total Views - pad to 15 chars
+		viewsStr := fmt.Sprintf("%-15s", fmt.Sprintf("%d", len(schema.Views)))
+		viewsCell := tview.NewTableCell(viewsStr).SetSelectable(true)
+		schemaTable.SetCell(row+1, 4, viewsCell)
+
+		// GUID - pad to 36 chars
+		guidStr := fmt.Sprintf("%-36s", schema.GUID)
+		guidCell := tview.NewTableCell(guidStr).SetSelectable(true)
+		schemaTable.SetCell(row+1, 5, guidCell)
+
+		// Description - no padding, takes remaining space
+		descCell := tview.NewTableCell(schema.Description).SetSelectable(true)
+		schemaTable.SetCell(row+1, 6, descCell)
+	}
+
+	schemaTable.SetTitle(" Schemas ").SetBorder(true).SetTitleAlign(tview.AlignLeft)
+
+	// Action buttons flex (define before input capture)
+	btnFlex := tview.NewFlex()
+	btnNewSchema := tview.NewButton("New Schema [n]").SetSelectedFunc(func() {
+		se.showNewSchemaDialog()
+	})
+	btnBack := tview.NewButton("Back [b]").SetSelectedFunc(func() {
+		se.pages.SwitchToPage("main")
+		se.pages.RemovePage("schemas")
+	})
+
+	// Set up button input captures for Tab/Shift+Tab navigation
+	btnNewSchema.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(schemaTable)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnBack)
+			return nil
+		}
+		return event
+	})
+
+	btnBack.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnNewSchema)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(schemaTable)
+			return nil
+		}
+		return event
+	})
+
+	btnFlex.AddItem(btnNewSchema, 0, 1, true).
+		AddItem(btnBack, 0, 1, false)
+
+	schemaTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.SwitchToPage("main")
+			se.pages.RemovePage("schemas")
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnNewSchema)
+			return nil
+		}
+		if event.Key() == tcell.KeyEnter {
+			row, _ := schemaTable.GetSelection()
+			if row > 0 && row <= len(se.db.Schemas) { // Skip header row
+				schemaIndex := row - 1
+				se.showSchemaEditor(schemaIndex, se.db.Schemas[schemaIndex])
+				return nil
+			}
+		}
+		if event.Rune() == 'n' {
+			se.showNewSchemaDialog()
+			return nil
+		}
+		if event.Rune() == 'b' {
+			se.pages.SwitchToPage("main")
+			se.pages.RemovePage("schemas")
+			return nil
+		}
+		return event
+	})
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(schemaTable, 0, 1, true).
+		AddItem(btnFlex, 1, 0, false)
+
+	se.pages.AddPage("schemas", flex, true, true)
+}
+
+// showSchemaEditor shows the editor for a specific schema
+func (se *SchemaEditor) showSchemaEditor(index int, schema *models.Schema) {
+	flex := tview.NewFlex().SetDirection(tview.FlexRow)
+
+	// Title
+	title := tview.NewTextView().
+		SetText(fmt.Sprintf("[::b]Schema: %s", schema.Name)).
+		SetDynamicColors(true).
+		SetTextAlign(tview.AlignCenter)
+
+	// Schema info display
+	info := tview.NewTextView().SetDynamicColors(true)
+	info.SetText(fmt.Sprintf("Tables: %d | Description: %s",
+		len(schema.Tables), schema.Description))
+
+	// Table list
+	tableList := tview.NewList().ShowSecondaryText(true)
+
+	for i, table := range schema.Tables {
+		tableIndex := i
+		table := table
+		colCount := len(table.Columns)
+		tableList.AddItem(table.Name, fmt.Sprintf("%d columns", colCount), rune('0'+i), func() {
+			se.showTableEditor(index, tableIndex, table)
+		})
+	}
+
+	tableList.AddItem("[New Table]", "Add a new table to this schema", 'n', func() {
+		se.showNewTableDialog(index)
+	})
+
+	tableList.AddItem("[Edit Schema Info]", "Edit schema properties", 'e', func() {
+		se.showEditSchemaDialog(index)
+	})
+
+	tableList.AddItem("[Delete Schema]", "Delete this schema", 'd', func() {
+		se.showDeleteSchemaConfirm(index)
+	})
+
+	tableList.SetBorder(true).SetTitle(" Tables ").SetTitleAlign(tview.AlignLeft)
+
+	// Action buttons (define before input capture)
+	btnFlex := tview.NewFlex()
+	btnNewTable := tview.NewButton("New Table [n]").SetSelectedFunc(func() {
+		se.showNewTableDialog(index)
+	})
+	btnBack := tview.NewButton("Back to Schemas [b]").SetSelectedFunc(func() {
+		se.pages.RemovePage("schema-editor")
+		se.pages.SwitchToPage("schemas")
+	})
+
+	// Set up button input captures for Tab/Shift+Tab navigation
+	btnNewTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(tableList)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnBack)
+			return nil
+		}
+		return event
+	})
+
+	btnBack.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnNewTable)
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(tableList)
+			return nil
+		}
+		return event
+	})
+
+	tableList.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.pages.RemovePage("schema-editor")
+			se.pages.SwitchToPage("schemas")
+			return nil
+		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnNewTable)
+			return nil
+		}
+		if event.Rune() == 'b' {
+			se.pages.RemovePage("schema-editor")
+			se.pages.SwitchToPage("schemas")
+		}
+		return event
+	})
+
+	btnFlex.AddItem(btnNewTable, 0, 1, true).
+		AddItem(btnBack, 0, 1, false)
+
+	flex.AddItem(title, 1, 0, false).
+		AddItem(info, 2, 0, false).
+		AddItem(tableList, 0, 1, true).
+		AddItem(btnFlex, 1, 0, false)
+
+	se.pages.AddPage("schema-editor", flex, true, true)
+}
+
+// showNewSchemaDialog shows dialog to create a new schema
+func (se *SchemaEditor) showNewSchemaDialog() {
+	form := tview.NewForm()
+
+	schemaName := ""
+	description := ""
+
+	form.AddInputField("Schema Name", "", 40, nil, func(value string) {
+		schemaName = value
+	})
+
+	form.AddInputField("Description", "", 40, nil, func(value string) {
+		description = value
+	})
+
+	form.AddButton("Save", func() {
+		if schemaName == "" {
+			return
+		}
+
+		se.CreateSchema(schemaName, description)
+
+		se.pages.RemovePage("new-schema")
+		se.pages.RemovePage("schemas")
+		se.showSchemaList()
+	})
+
+	form.AddButton("Back", func() {
+		se.pages.RemovePage("new-schema")
+		se.pages.RemovePage("schemas")
+		se.showSchemaList()
+	})
+
+	form.SetBorder(true).SetTitle(" New Schema ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("new-schema", "schemas")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("new-schema", form, true, true)
+}
+
+// showEditSchemaDialog shows dialog to edit schema properties
+func (se *SchemaEditor) showEditSchemaDialog(schemaIndex int) {
+	schema := se.db.Schemas[schemaIndex]
+	form := tview.NewForm()
+
+	// Local variables to collect changes
+	newName := schema.Name
+	newOwner := schema.Owner
+	newDescription := schema.Description
+	newGUID := schema.GUID
+
+	form.AddInputField("Schema Name", schema.Name, 40, nil, func(value string) {
+		newName = value
+	})
+
+	form.AddInputField("Owner", schema.Owner, 40, nil, func(value string) {
+		newOwner = value
+	})
+
+	form.AddTextArea("Description", schema.Description, 40, 5, 0, func(value string) {
+		newDescription = value
+	})
+
+	form.AddInputField("GUID", schema.GUID, 40, nil, func(value string) {
+		newGUID = value
+	})
+
+	form.AddButton("Save", func() {
+		// Apply changes using dataops
+		se.UpdateSchema(schemaIndex, newName, newOwner, newDescription)
+		se.db.Schemas[schemaIndex].GUID = newGUID
+
+		schema := se.db.Schemas[schemaIndex]
+		se.pages.RemovePage("edit-schema")
+		se.pages.RemovePage("schema-editor")
+		se.showSchemaEditor(schemaIndex, schema)
+	})
+
+	form.AddButton("Back", func() {
+		// Discard changes - don't apply them
+		schema := se.db.Schemas[schemaIndex]
+		se.pages.RemovePage("edit-schema")
+		se.pages.RemovePage("schema-editor")
+		se.showSchemaEditor(schemaIndex, schema)
+	})
+
+	form.SetBorder(true).SetTitle(" Edit Schema ").SetTitleAlign(tview.AlignLeft)
+	form.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyEscape {
+			se.showExitConfirmation("edit-schema", "schema-editor")
+			return nil
+		}
+		return event
+	})
+
+	se.pages.AddPage("edit-schema", form, true, true)
+}

pkg/ui/table_dataops.go

@@ -0,0 +1,88 @@
+package ui
+
+import "git.warky.dev/wdevs/relspecgo/pkg/models"
+
+// Table data operations - business logic for table management
+
+// CreateTable creates a new table and adds it to a schema
+func (se *SchemaEditor) CreateTable(schemaIndex int, name, description string) *models.Table {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	newTable := &models.Table{
+		Name:        name,
+		Schema:      schema.Name,
+		Description: description,
+		Columns:     make(map[string]*models.Column),
+		Constraints: make(map[string]*models.Constraint),
+		Indexes:     make(map[string]*models.Index),
+	}
+	schema.UpdateDate()
+	schema.Tables = append(schema.Tables, newTable)
+	return newTable
+}
+
+// UpdateTable updates an existing table's properties
+func (se *SchemaEditor) UpdateTable(schemaIndex, tableIndex int, name, description string) {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return
+	}
+	schema.UpdateDate()
+	table := schema.Tables[tableIndex]
+	table.Name = name
+	table.Description = description
+	table.UpdateDate()
+}
+
+// DeleteTable removes a table from a schema
+func (se *SchemaEditor) DeleteTable(schemaIndex, tableIndex int) bool {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return false
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return false
+	}
+	schema.UpdateDate()
+	schema.Tables = append(schema.Tables[:tableIndex], schema.Tables[tableIndex+1:]...)
+	return true
+}
+
+// GetTable returns a table by schema and table index
+func (se *SchemaEditor) GetTable(schemaIndex, tableIndex int) *models.Table {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+
+	schema := se.db.Schemas[schemaIndex]
+	if tableIndex < 0 || tableIndex >= len(schema.Tables) {
+		return nil
+	}
+
+	return schema.Tables[tableIndex]
+}
+
+// GetAllTables returns all tables across all schemas
+func (se *SchemaEditor) GetAllTables() []*models.Table {
+	var tables []*models.Table
+	for _, schema := range se.db.Schemas {
+		tables = append(tables, schema.Tables...)
+	}
+	return tables
+}
+
+// GetTablesInSchema returns all tables in a specific schema
+func (se *SchemaEditor) GetTablesInSchema(schemaIndex int) []*models.Table {
+	if schemaIndex < 0 || schemaIndex >= len(se.db.Schemas) {
+		return nil
+	}
+	return se.db.Schemas[schemaIndex].Tables
+}