fix(type_mapper): update timestamp type mapping to use SqlTimeStamp

- 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.

.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

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
+- Code generation
-- Writing and enhancing tests
+- Documentation generation & improvement
-- Refactoring and optimizing existing code
+- Test writing & enhancement
+- Refactoring and code cleanup
 
-AI is **not** used for core design or architecture decisions.  
+AI is **not** used for:
-All design decisions are deferred to human discussion.  
-AI is employed only for enhancements to human-written code.
 
-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
+- 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)
+- 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
+- Go version: 1.24.0
-- Uses Cobra for CLI, Viper for configuration
+- 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 \
@@ -37,9 +42,9 @@ COMPOSE_CMD := $(shell \
 all: lint test build ## Run linting, tests, and build
 
 build: deps ## Build the binary
-	@echo "Building $(BINARY_NAME)..."
+	@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)..."
+	@echo "Installing $(BINARY_NAME) $(VERSION)..."
-	$(GOCMD) install ./cmd/relspec
+	$(GOCMD) install -ldflags "$(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
@@ -185,6 +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

@@ -1,43 +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)
+- [✔️] 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.)
+- [☠️] 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 Relations
-- [  ] Add Indexes
+- [ ] Add Indexes
-- [  ] Add Views
+- [ ] Add Views
-- [  ] Add Sequences
+- [ ] Add Sequences
-- [  ] Add Scripts
+- [ ] Add Scripts
-- [  ] Domain / Table Assignment
+- [ ] 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
@@ -46,12 +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"
@@ -31,8 +33,10 @@ 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"
 )
@@ -70,6 +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
@@ -84,13 +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:
+Connection String Examples:
-  postgres://username:password@localhost:5432/database_name
+  PostgreSQL:
-  postgres://username:password@localhost/database_name
+    postgres://username:password@localhost:5432/database_name
-  postgresql://user:pass@host:5432/dbname?sslmode=disable
+    postgres://username:password@localhost/database_name
-  postgresql://user:pass@host/dbname?sslmode=require
+    postgresql://user:pass@host:5432/dbname?sslmode=disable
-  host=localhost port=5432 user=username password=pass dbname=mydb 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:
@@ -136,14 +150,22 @@ 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)")
@@ -291,6 +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)
 	}
@@ -346,6 +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

@@ -19,6 +19,7 @@ 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"
 	"git.warky.dev/wdevs/relspecgo/pkg/ui"
@@ -33,6 +34,7 @@ import (
 	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"
 )
@@ -73,6 +75,7 @@ Supports reading from and writing to all supported formats:
     - 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
@@ -87,13 +90,19 @@ Supports reading from and writing to all supported formats:
     - prisma: Prisma schema files (.prisma)
     - typeorm: TypeORM entity files (TypeScript)
     - pgsql: PostgreSQL SQL schema
+    - sqlite: SQLite SQL schema (with automatic schema flattening)
 
-PostgreSQL Connection String Examples:
+Connection String Examples:
-  postgres://username:password@localhost:5432/database_name
+  PostgreSQL:
-  postgres://username:password@localhost/database_name
+    postgres://username:password@localhost:5432/database_name
-  postgresql://user:pass@host:5432/dbname?sslmode=disable
+    postgres://username:password@localhost/database_name
-  postgresql://user:pass@host/dbname?sslmode=require
+    postgresql://user:pass@host:5432/dbname?sslmode=disable
-  host=localhost port=5432 user=username password=pass dbname=mydb 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
@@ -107,15 +116,21 @@ Examples:
   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`,
+  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)")
+	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 database 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)")
+	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")
 
@@ -281,6 +296,16 @@ func readDatabaseForEdit(dbType, filePath, connString, label string) (*models.Da
 			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)
 	}
@@ -319,6 +344,8 @@ func writeDatabaseForEdit(dbType, filePath, connString string, db *models.Databa
 		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:

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

@@ -21,6 +21,7 @@ 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"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
@@ -34,6 +35,7 @@ import (
 	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"
 )
@@ -314,6 +316,16 @@ func readDatabaseForMerge(dbType, filePath, connString, label string) (*models.D
 			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)
 	}
@@ -385,6 +397,8 @@ func writeDatabaseForMerge(dbType, filePath, connString string, db *models.Datab
 			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 != "" {

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() {
@@ -24,4 +67,5 @@ func init() {
 	rootCmd.AddCommand(editCmd)
 	rootCmd.AddCommand(mergeCmd)
 	rootCmd.AddCommand(splitCmd)
+	rootCmd.AddCommand(versionCmd)
 }

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

go.mod

@@ -6,33 +6,46 @@ 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 v0.28.0
+	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/term v0.34.0 // 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

@@ -1,15 +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=
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@@ -26,15 +50,27 @@ github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
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@@ -45,6 +81,8 @@ github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/f
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@@ -70,13 +108,17 @@ golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5y
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@@ -85,6 +127,8 @@ golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
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@@ -92,14 +136,15 @@ golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
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+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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@@ -116,8 +161,8 @@ golang.org/x/term v0.12.0/go.mod h1:owVbMEjm3cBLCHdkQu9b1opXd4ETQWc3BhuQGKgXgvU=
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-golang.org/x/term v0.34.0 h1:O/2T7POpk0ZZ7MAzMeWFSg6S5IpWd/RXDlM9hgM3DR4=
+golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU=
-golang.org/x/term v0.34.0/go.mod h1:5jC53AEywhIVebHgPVeg0mj8OD3VO9OzclacVrqpaAw=
+golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254=
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 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
@@ -127,14 +172,16 @@ golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
-golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
+golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
-golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
+golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
 golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
+golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
@@ -142,3 +189,31 @@ gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EV
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+modernc.org/cc/v4 v4.27.1 h1:9W30zRlYrefrDV2JE2O8VDtJ1yPGownxciz5rrbQZis=
+modernc.org/cc/v4 v4.27.1/go.mod h1:uVtb5OGqUKpoLWhqwNQo/8LwvoiEBLvZXIQ/SmO6mL0=
+modernc.org/ccgo/v4 v4.30.1 h1:4r4U1J6Fhj98NKfSjnPUN7Ze2c6MnAdL0hWw6+LrJpc=
+modernc.org/ccgo/v4 v4.30.1/go.mod h1:bIOeI1JL54Utlxn+LwrFyjCx2n2RDiYEaJVSrgdrRfM=
+modernc.org/fileutil v1.3.40 h1:ZGMswMNc9JOCrcrakF1HrvmergNLAmxOPjizirpfqBA=
+modernc.org/fileutil v1.3.40/go.mod h1:HxmghZSZVAz/LXcMNwZPA/DRrQZEVP9VX0V4LQGQFOc=
+modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
+modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
+modernc.org/gc/v3 v3.1.1 h1:k8T3gkXWY9sEiytKhcgyiZ2L0DTyCQ/nvX+LoCljoRE=
+modernc.org/gc/v3 v3.1.1/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
+modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
+modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
+modernc.org/libc v1.67.6 h1:eVOQvpModVLKOdT+LvBPjdQqfrZq+pC39BygcT+E7OI=
+modernc.org/libc v1.67.6/go.mod h1:JAhxUVlolfYDErnwiqaLvUqc8nfb2r6S6slAgZOnaiE=
+modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
+modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
+modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
+modernc.org/memory v1.11.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
+modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
+modernc.org/opt v0.1.4/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
+modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
+modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
+modernc.org/sqlite v1.44.3 h1:+39JvV/HWMcYslAwRxHb8067w+2zowvFOUrOWIy9PjY=
+modernc.org/sqlite v1.44.3/go.mod h1:CzbrU2lSB1DKUusvwGz7rqEKIq+NUd8GWuBBZDs9/nA=
+modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
+modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
+modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
+modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=

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/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/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/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/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/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/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",
+		"integer":                     "integer",
-		"bigint":                      "int64",
+		"bigint":                      "bigint",
-		"smallint":                    "int16",
+		"smallint":                    "smallint",
-		"int":                         "int",
+		"int":                         "integer",
-		"int2":                        "int16",
+		"int2":                        "smallint",
-		"int4":                        "int",
+		"int4":                        "integer",
-		"int8":                        "int64",
+		"int8":                        "bigint",
-		"serial":                      "int",
+		"serial":                      "serial",
-		"bigserial":                   "int64",
+		"bigserial":                   "bigserial",
-		"smallserial":                 "int16",
+		"smallserial":                 "smallserial",
-		"numeric":                     "decimal",
+		"numeric":                     "numeric",
 		"decimal":                     "decimal",
-		"real":                        "float32",
+		"real":                        "real",
-		"double precision":            "float64",
+		"double precision":            "double precision",
-		"float4":                      "float32",
+		"float4":                      "real",
-		"float8":                      "float64",
+		"float8":                      "double precision",
-		"money":                       "decimal",
+		"money":                       "money",
-		"character varying":           "string",
+		"character varying":           "varchar",
-		"varchar":                     "string",
+		"varchar":                     "varchar",
-		"character":                   "string",
+		"character":                   "char",
-		"char":                        "string",
+		"char":                        "char",
-		"text":                        "string",
+		"text":                        "text",
-		"boolean":                     "bool",
+		"boolean":                     "boolean",
-		"bool":                        "bool",
+		"bool":                        "boolean",
 		"date":                        "date",
 		"time":                        "time",
 		"time without time zone":      "time",

pkg/readers/pgsql/reader_test.go

@@ -177,20 +177,20 @@ func TestMapDataType(t *testing.T) {
 		udtName  string
 		expected string
 	}{
-		{"integer", "int4", "int"},
+		{"integer", "int4", "integer"},
-		{"bigint", "int8", "int64"},
+		{"bigint", "int8", "bigint"},
-		{"smallint", "int2", "int16"},
+		{"smallint", "int2", "smallint"},
-		{"character varying", "varchar", "string"},
+		{"character varying", "varchar", "varchar"},
-		{"text", "text", "string"},
+		{"text", "text", "text"},
-		{"boolean", "bool", "bool"},
+		{"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"},
+		{"numeric", "numeric", "numeric"},
-		{"real", "float4", "float32"},
+		{"real", "float4", "real"},
-		{"double precision", "float8", "float64"},
+		{"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) {

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/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/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/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/table_screens.go

@@ -270,6 +270,9 @@ func (se *SchemaEditor) showTableEditor(schemaIndex, tableIndex int, table *mode
 			se.showColumnEditor(schemaIndex, tableIndex, row-1, column)
 		}
 	})
+	btnRelations := tview.NewButton("Relations [r]").SetSelectedFunc(func() {
+		se.showRelationshipList(schemaIndex, tableIndex)
+	})
 	btnDelTable := tview.NewButton("Delete Table [d]").SetSelectedFunc(func() {
 		se.showDeleteTableConfirm(schemaIndex, tableIndex)
 	})
@@ -308,6 +311,18 @@ func (se *SchemaEditor) showTableEditor(schemaIndex, tableIndex int, table *mode
 			se.app.SetFocus(btnEditColumn)
 			return nil
 		}
+		if event.Key() == tcell.KeyTab {
+			se.app.SetFocus(btnRelations)
+			return nil
+		}
+		return event
+	})
+
+	btnRelations.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Key() == tcell.KeyBacktab {
+			se.app.SetFocus(btnEditTable)
+			return nil
+		}
 		if event.Key() == tcell.KeyTab {
 			se.app.SetFocus(btnDelTable)
 			return nil
@@ -317,7 +332,7 @@ func (se *SchemaEditor) showTableEditor(schemaIndex, tableIndex int, table *mode
 
 	btnDelTable.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 		if event.Key() == tcell.KeyBacktab {
-			se.app.SetFocus(btnEditTable)
+			se.app.SetFocus(btnRelations)
 			return nil
 		}
 		if event.Key() == tcell.KeyTab {
@@ -342,6 +357,7 @@ func (se *SchemaEditor) showTableEditor(schemaIndex, tableIndex int, table *mode
 	btnFlex.AddItem(btnNewCol, 0, 1, true).
 		AddItem(btnEditColumn, 0, 1, false).
 		AddItem(btnEditTable, 0, 1, false).
+		AddItem(btnRelations, 0, 1, false).
 		AddItem(btnDelTable, 0, 1, false).
 		AddItem(btnBack, 0, 1, false)
 
@@ -373,6 +389,10 @@ func (se *SchemaEditor) showTableEditor(schemaIndex, tableIndex int, table *mode
 			}
 			return nil
 		}
+		if event.Rune() == 'r' {
+			se.showRelationshipList(schemaIndex, tableIndex)
+			return nil
+		}
 		if event.Rune() == 'b' {
 			se.pages.RemovePage("table-editor")
 			se.pages.SwitchToPage("schema-editor")

pkg/writers/bun/template_data.go

@@ -110,8 +110,7 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper, fl
 	tableName := writers.QualifiedTableName(schema, table.Name, flattenSchema)
 
 	// Generate model name: Model + Schema + Table (all PascalCase)
-	singularTable := Singularize(table.Name)
+	tablePart := SnakeCaseToPascalCase(table.Name)
-	tablePart := SnakeCaseToPascalCase(singularTable)
 
 	// Include schema name in model name
 	var modelName string

pkg/writers/bun/type_mapper.go

@@ -62,6 +62,17 @@ func (tm *TypeMapper) isSimpleType(sqlType string) bool {
 	return simpleTypes[sqlType]
 }
 
+// isSerialType checks if a SQL type is a serial type (auto-incrementing)
+func (tm *TypeMapper) isSerialType(sqlType string) bool {
+	baseType := tm.extractBaseType(sqlType)
+	serialTypes := map[string]bool{
+		"serial":      true,
+		"bigserial":   true,
+		"smallserial": true,
+	}
+	return serialTypes[baseType]
+}
+
 // baseGoType returns the base Go type for a SQL type (not null, simple types only)
 func (tm *TypeMapper) baseGoType(sqlType string) string {
 	typeMap := map[string]string{
@@ -122,10 +133,10 @@ func (tm *TypeMapper) bunGoType(sqlType string) string {
 		"decimal":          tm.sqlTypesAlias + ".SqlFloat64",
 
 		// Date/Time types
-		"timestamp":                   tm.sqlTypesAlias + ".SqlTime",
+		"timestamp":                   tm.sqlTypesAlias + ".SqlTimeStamp",
-		"timestamp without time zone": tm.sqlTypesAlias + ".SqlTime",
+		"timestamp without time zone": tm.sqlTypesAlias + ".SqlTimeStamp",
-		"timestamp with time zone":    tm.sqlTypesAlias + ".SqlTime",
+		"timestamp with time zone":    tm.sqlTypesAlias + ".SqlTimeStamp",
-		"timestamptz":                 tm.sqlTypesAlias + ".SqlTime",
+		"timestamptz":                 tm.sqlTypesAlias + ".SqlTimeStamp",
 		"date":                        tm.sqlTypesAlias + ".SqlDate",
 		"time":                        tm.sqlTypesAlias + ".SqlTime",
 		"time without time zone":      tm.sqlTypesAlias + ".SqlTime",
@@ -190,6 +201,11 @@ func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) st
 		parts = append(parts, "pk")
 	}
 
+	// Auto increment (for serial types or explicit auto_increment)
+	if column.AutoIncrement || tm.isSerialType(column.Type) {
+		parts = append(parts, "autoincrement")
+	}
+
 	// Default value
 	if column.Default != nil {
 		// Sanitize default value to remove backticks
@@ -251,7 +267,15 @@ func (tm *TypeMapper) BuildRelationshipTag(constraint *models.Constraint, relTyp
 	if len(constraint.Columns) > 0 && len(constraint.ReferencedColumns) > 0 {
 		localCol := constraint.Columns[0]
 		foreignCol := constraint.ReferencedColumns[0]
-		parts = append(parts, fmt.Sprintf("join:%s=%s", localCol, foreignCol))
+
+		// For has-many relationships, swap the columns
+		// has-one: join:fk_in_this_table=pk_in_other_table
+		// has-many: join:pk_in_this_table=fk_in_other_table
+		if relType == "has-many" {
+			parts = append(parts, fmt.Sprintf("join:%s=%s", foreignCol, localCol))
+		} else {
+			parts = append(parts, fmt.Sprintf("join:%s=%s", localCol, foreignCol))
+		}
 	}
 
 	return strings.Join(parts, ",")

pkg/writers/bun/writer.go

@@ -318,8 +318,7 @@ func (w *Writer) findTable(schemaName, tableName string, db *models.Database) *m
 
 // getModelName generates the model name from schema and table name
 func (w *Writer) getModelName(schemaName, tableName string) string {
-	singular := Singularize(tableName)
+	tablePart := SnakeCaseToPascalCase(tableName)
-	tablePart := SnakeCaseToPascalCase(singular)
 
 	// Include schema name in model name
 	var modelName string

pkg/writers/bun/writer_test.go

@@ -66,7 +66,7 @@ func TestWriter_WriteTable(t *testing.T) {
 	// Verify key elements are present
 	expectations := []string{
 		"package models",
-		"type ModelPublicUser struct",
+		"type ModelPublicUsers struct",
 		"bun.BaseModel",
 		"table:public.users",
 		"alias:users",
@@ -78,9 +78,9 @@ func TestWriter_WriteTable(t *testing.T) {
 		"resolvespec_common.SqlTime",
 		"bun:\"id",
 		"bun:\"email",
-		"func (m ModelPublicUser) TableName() string",
+		"func (m ModelPublicUsers) TableName() string",
 		"return \"public.users\"",
-		"func (m ModelPublicUser) GetID() int64",
+		"func (m ModelPublicUsers) GetID() int64",
 	}
 
 	for _, expected := range expectations {
@@ -90,8 +90,8 @@ func TestWriter_WriteTable(t *testing.T) {
 	}
 
 	// Verify Bun-specific elements
-	if !strings.Contains(generated, "bun:\"id,type:bigint,pk,") {
+	if !strings.Contains(generated, "bun:\"id,type:bigint,pk,autoincrement,") {
-		t.Errorf("Missing Bun-style primary key tag")
+		t.Errorf("Missing Bun-style primary key tag with autoincrement")
 	}
 }
 
@@ -308,14 +308,20 @@ func TestWriter_MultipleReferencesToSameTable(t *testing.T) {
 	filepointerStr := string(filepointerContent)
 
 	// Should have two different has-many relationships with unique names
-	hasManyExpectations := []string{
+	hasManyExpectations := []struct {
-		"RelRIDFilepointerRequestOrgAPIEvents",  // Has many via rid_filepointer_request
+		fieldName string
-		"RelRIDFilepointerResponseOrgAPIEvents", // Has many via rid_filepointer_response
+		tag       string
+	}{
+		{"RelRIDFilepointerRequestOrgAPIEvents", "join:id_filepointer=rid_filepointer_request"},  // Has many via rid_filepointer_request
+		{"RelRIDFilepointerResponseOrgAPIEvents", "join:id_filepointer=rid_filepointer_response"}, // Has many via rid_filepointer_response
 	}
 
 	for _, exp := range hasManyExpectations {
-		if !strings.Contains(filepointerStr, exp) {
+		if !strings.Contains(filepointerStr, exp.fieldName) {
-			t.Errorf("Missing has-many relationship field: %s\nGenerated:\n%s", exp, filepointerStr)
+			t.Errorf("Missing has-many relationship field: %s\nGenerated:\n%s", exp.fieldName, filepointerStr)
+		}
+		if !strings.Contains(filepointerStr, exp.tag) {
+			t.Errorf("Missing has-many relationship join tag: %s\nGenerated:\n%s", exp.tag, filepointerStr)
 		}
 	}
 }
@@ -561,8 +567,8 @@ func TestTypeMapper_SQLTypeToGoType_Bun(t *testing.T) {
 		{"bigint", false, "resolvespec_common.SqlInt64"},
 		{"varchar", true, "resolvespec_common.SqlString"}, // Bun uses sql types even for NOT NULL strings
 		{"varchar", false, "resolvespec_common.SqlString"},
-		{"timestamp", true, "resolvespec_common.SqlTime"},
+		{"timestamp", true, "resolvespec_common.SqlTimeStamp"},
-		{"timestamp", false, "resolvespec_common.SqlTime"},
+		{"timestamp", false, "resolvespec_common.SqlTimeStamp"},
 		{"date", false, "resolvespec_common.SqlDate"},
 		{"boolean", true, "bool"},
 		{"boolean", false, "resolvespec_common.SqlBool"},
@@ -618,6 +624,37 @@ func TestTypeMapper_BuildBunTag(t *testing.T) {
 			},
 			want: []string{"status,", "type:text,", "default:active,"},
 		},
+		{
+			name: "auto increment with AutoIncrement flag",
+			column: &models.Column{
+				Name:          "id",
+				Type:          "bigint",
+				NotNull:       true,
+				IsPrimaryKey:  true,
+				AutoIncrement: true,
+			},
+			want: []string{"id,", "type:bigint,", "pk,", "autoincrement,"},
+		},
+		{
+			name: "serial type (auto-increment)",
+			column: &models.Column{
+				Name:         "id",
+				Type:         "serial",
+				NotNull:      true,
+				IsPrimaryKey: true,
+			},
+			want: []string{"id,", "type:serial,", "pk,", "autoincrement,"},
+		},
+		{
+			name: "bigserial type (auto-increment)",
+			column: &models.Column{
+				Name:         "id",
+				Type:         "bigserial",
+				NotNull:      true,
+				IsPrimaryKey: true,
+			},
+			want: []string{"id,", "type:bigserial,", "pk,", "autoincrement,"},
+		},
 	}
 
 	for _, tt := range tests {

pkg/writers/doc.go

@@ -0,0 +1,67 @@
+// Package writers provides interfaces and implementations for writing database schemas
+// to various output formats and destinations.
+//
+// # Overview
+//
+// The writers package defines a common Writer interface that all format-specific writers
+// implement. This allows RelSpec to export database schemas to multiple formats including:
+//   - SQL schema files (PostgreSQL, SQLite)
+//   - Schema definition files (DBML, DCTX, DrawDB, GraphQL)
+//   - ORM model files (GORM, Bun, Drizzle, Prisma, TypeORM)
+//   - Data interchange formats (JSON, YAML)
+//
+// # Architecture
+//
+// Each writer implementation is located in its own subpackage (e.g., pkg/writers/dbml,
+// pkg/writers/pgsql) and implements the Writer interface, supporting three levels of
+// granularity:
+//   - WriteDatabase() - Write complete database with all schemas
+//   - WriteSchema() - Write single schema with all tables
+//   - WriteTable() - Write single table with all columns and metadata
+//
+// # Usage
+//
+// Writers are instantiated with WriterOptions containing destination-specific configuration:
+//
+//	// Write to file
+//	writer := dbml.NewWriter(&writers.WriterOptions{
+//	    OutputPath: "schema.dbml",
+//	})
+//	err := writer.WriteDatabase(db)
+//
+//	// Write ORM models with package name
+//	writer := gorm.NewWriter(&writers.WriterOptions{
+//	    OutputPath:  "./models",
+//	    PackageName: "models",
+//	})
+//	err := writer.WriteDatabase(db)
+//
+//	// Write with schema flattening for SQLite
+//	writer := sqlite.NewWriter(&writers.WriterOptions{
+//	    OutputPath:    "schema.sql",
+//	    FlattenSchema: true,
+//	})
+//	err := writer.WriteDatabase(db)
+//
+// # Schema Flattening
+//
+// The FlattenSchema option controls how schema-qualified table names are handled:
+//   - false (default): Uses dot notation (schema.table)
+//   - true: Joins with underscore (schema_table), useful for SQLite
+//
+// # 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 SQL schema
+//   - sqlite: SQLite SQL schema with automatic flattening
+package writers

pkg/writers/gorm/template_data.go

@@ -109,8 +109,7 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper, fl
 	tableName := writers.QualifiedTableName(schema, table.Name, flattenSchema)
 
 	// Generate model name: Model + Schema + Table (all PascalCase)
-	singularTable := Singularize(table.Name)
+	tablePart := SnakeCaseToPascalCase(table.Name)
-	tablePart := SnakeCaseToPascalCase(singularTable)
 
 	// Include schema name in model name
 	var modelName string

pkg/writers/gorm/type_mapper.go

@@ -158,10 +158,10 @@ func (tm *TypeMapper) nullableGoType(sqlType string) string {
 		"decimal":          tm.sqlTypesAlias + ".SqlFloat64",
 
 		// Date/Time types
-		"timestamp":                   tm.sqlTypesAlias + ".SqlTime",
+		"timestamp":                   tm.sqlTypesAlias + ".SqlTimeStamp",
-		"timestamp without time zone": tm.sqlTypesAlias + ".SqlTime",
+		"timestamp without time zone": tm.sqlTypesAlias + ".SqlTimeStamp",
-		"timestamp with time zone":    tm.sqlTypesAlias + ".SqlTime",
+		"timestamp with time zone":    tm.sqlTypesAlias + ".SqlTimeStamp",
-		"timestamptz":                 tm.sqlTypesAlias + ".SqlTime",
+		"timestamptz":                 tm.sqlTypesAlias + ".SqlTimeStamp",
 		"date":                        tm.sqlTypesAlias + ".SqlDate",
 		"time":                        tm.sqlTypesAlias + ".SqlTime",
 		"time without time zone":      tm.sqlTypesAlias + ".SqlTime",

pkg/writers/gorm/writer.go

@@ -312,8 +312,7 @@ func (w *Writer) findTable(schemaName, tableName string, db *models.Database) *m
 
 // getModelName generates the model name from schema and table name
 func (w *Writer) getModelName(schemaName, tableName string) string {
-	singular := Singularize(tableName)
+	tablePart := SnakeCaseToPascalCase(tableName)
-	tablePart := SnakeCaseToPascalCase(singular)
 
 	// Include schema name in model name
 	var modelName string

pkg/writers/gorm/writer_test.go

@@ -66,7 +66,7 @@ func TestWriter_WriteTable(t *testing.T) {
 	// Verify key elements are present
 	expectations := []string{
 		"package models",
-		"type ModelPublicUser struct",
+		"type ModelPublicUsers struct",
 		"ID",
 		"int64",
 		"Email",
@@ -75,9 +75,9 @@ func TestWriter_WriteTable(t *testing.T) {
 		"time.Time",
 		"gorm:\"column:id",
 		"gorm:\"column:email",
-		"func (m ModelPublicUser) TableName() string",
+		"func (m ModelPublicUsers) TableName() string",
 		"return \"public.users\"",
-		"func (m ModelPublicUser) GetID() int64",
+		"func (m ModelPublicUsers) GetID() int64",
 	}
 
 	for _, expected := range expectations {
@@ -655,7 +655,7 @@ func TestTypeMapper_SQLTypeToGoType(t *testing.T) {
 		{"varchar", true, "string"},
 		{"varchar", false, "sql_types.SqlString"},
 		{"timestamp", true, "time.Time"},
-		{"timestamp", false, "sql_types.SqlTime"},
+		{"timestamp", false, "sql_types.SqlTimeStamp"},
 		{"boolean", true, "bool"},
 		{"boolean", false, "sql_types.SqlBool"},
 	}

pkg/writers/mssql/README.md

@@ -0,0 +1,130 @@
+# MSSQL Writer
+
+Generates Microsoft SQL Server DDL (Data Definition Language) from database schema models.
+
+## Features
+
+- **DDL Generation**: Generates complete SQL scripts for creating MSSQL schema
+- **Schema Support**: Creates multiple schemas with proper naming
+- **Bracket Notation**: Uses [schema].[table] bracket notation for identifiers
+- **Identity Columns**: Generates IDENTITY(1,1) for auto-increment columns
+- **Constraints**: Generates primary keys, foreign keys, unique, and check constraints
+- **Indexes**: Creates indexes with unique support
+- **Extended Properties**: Uses sp_addextendedproperty for comments
+- **Direct Execution**: Can directly execute DDL on MSSQL database
+- **Schema Flattening**: Optional schema flattening for compatibility
+
+## Features by Phase
+
+1. **Phase 1**: Create schemas
+2. **Phase 2**: Create tables with columns, identity, and defaults
+3. **Phase 3**: Add primary key constraints
+4. **Phase 4**: Create indexes
+5. **Phase 5**: Add unique constraints
+6. **Phase 6**: Add check constraints
+7. **Phase 7**: Add foreign key constraints
+8. **Phase 8**: Add extended properties (comments)
+
+## Type Mappings
+
+| Canonical Type | MSSQL Type |
+|----------------|-----------|
+| int | INT |
+| int64 | BIGINT |
+| int16 | SMALLINT |
+| int8 | TINYINT |
+| bool | BIT |
+| float32 | REAL |
+| float64 | FLOAT |
+| decimal | NUMERIC |
+| string | NVARCHAR(255) |
+| text | NVARCHAR(MAX) |
+| timestamp | DATETIME2 |
+| timestamptz | DATETIMEOFFSET |
+| uuid | UNIQUEIDENTIFIER |
+| bytea | VARBINARY(MAX) |
+| date | DATE |
+| time | TIME |
+
+## Usage
+
+### Generate SQL File
+
+```go
+import "git.warky.dev/wdevs/relspecgo/pkg/writers/mssql"
+import "git.warky.dev/wdevs/relspecgo/pkg/writers"
+
+writer := mssql.NewWriter(&writers.WriterOptions{
+    OutputPath: "schema.sql",
+    FlattenSchema: false,
+})
+
+err := writer.WriteDatabase(db)
+if err != nil {
+    panic(err)
+}
+```
+
+### Direct Database Execution
+
+```go
+writer := mssql.NewWriter(&writers.WriterOptions{
+    OutputPath: "",
+    Metadata: map[string]interface{}{
+        "connection_string": "sqlserver://sa:password@localhost/newdb",
+    },
+})
+
+err := writer.WriteDatabase(db)
+if err != nil {
+    panic(err)
+}
+```
+
+### CLI Usage
+
+Generate SQL file:
+```bash
+relspec convert --from json --from-path schema.json \
+                --to mssql --to-path schema.sql
+```
+
+Execute directly to database:
+```bash
+relspec convert --from json --from-path schema.json \
+                --to mssql \
+                --metadata '{"connection_string":"sqlserver://sa:password@localhost/mydb"}'
+```
+
+## Default Values
+
+The writer supports several default value patterns:
+- Functions: `GETDATE()`, `CURRENT_TIMESTAMP()`
+- Literals: strings wrapped in quotes, numbers, booleans (0/1 for BIT)
+- CAST expressions
+
+## Comments/Extended Properties
+
+Table and column descriptions are stored as MS_Description extended properties:
+
+```sql
+EXEC sp_addextendedproperty
+  @name = 'MS_Description',
+  @value = 'Table description here',
+  @level0type = 'SCHEMA', @level0name = 'dbo',
+  @level1type = 'TABLE', @level1name = 'my_table';
+```
+
+## Testing
+
+Run tests with:
+```bash
+go test ./pkg/writers/mssql/...
+```
+
+## Limitations
+
+- Views are not currently supported in the writer
+- Sequences are not supported (MSSQL uses IDENTITY instead)
+- Partitioning and advanced features are not supported
+- Generated DDL assumes no triggers or computed columns

pkg/writers/mssql/writer.go

@@ -0,0 +1,579 @@
+package mssql
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"io"
+	"os"
+	"sort"
+	"strings"
+
+	_ "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/writers"
+)
+
+// Writer implements the Writer interface for MSSQL SQL output
+type Writer struct {
+	options *writers.WriterOptions
+	writer  io.Writer
+}
+
+// NewWriter creates a new MSSQL SQL writer
+func NewWriter(options *writers.WriterOptions) *Writer {
+	return &Writer{
+		options: options,
+	}
+}
+
+// qualTable returns a schema-qualified name using bracket notation
+func (w *Writer) qualTable(schema, name string) string {
+	if w.options.FlattenSchema {
+		return fmt.Sprintf("[%s]", name)
+	}
+	return fmt.Sprintf("[%s].[%s]", schema, name)
+}
+
+// WriteDatabase writes the entire database schema as SQL
+func (w *Writer) WriteDatabase(db *models.Database) error {
+	// Check if we should execute SQL directly on a database
+	if connString, ok := w.options.Metadata["connection_string"].(string); ok && connString != "" {
+		return w.executeDatabaseSQL(db, connString)
+	}
+
+	var writer io.Writer
+	var file *os.File
+	var err error
+
+	// Use existing writer if already set (for testing)
+	if w.writer != nil {
+		writer = w.writer
+	} else if w.options.OutputPath != "" {
+		// Determine output destination
+		file, err = os.Create(w.options.OutputPath)
+		if err != nil {
+			return fmt.Errorf("failed to create output file: %w", err)
+		}
+		defer file.Close()
+		writer = file
+	} else {
+		writer = os.Stdout
+	}
+
+	w.writer = writer
+
+	// Write header comment
+	fmt.Fprintf(w.writer, "-- MSSQL Database Schema\n")
+	fmt.Fprintf(w.writer, "-- Database: %s\n", db.Name)
+	fmt.Fprintf(w.writer, "-- Generated by RelSpec\n\n")
+
+	// Process each schema in the database
+	for _, schema := range db.Schemas {
+		if err := w.WriteSchema(schema); err != nil {
+			return fmt.Errorf("failed to write schema %s: %w", schema.Name, err)
+		}
+	}
+
+	return nil
+}
+
+// WriteSchema writes a single schema and all its tables
+func (w *Writer) WriteSchema(schema *models.Schema) error {
+	if w.writer == nil {
+		w.writer = os.Stdout
+	}
+
+	// Phase 1: Create schema (skip dbo schema and when flattening)
+	if schema.Name != "dbo" && !w.options.FlattenSchema {
+		fmt.Fprintf(w.writer, "-- Schema: %s\n", schema.Name)
+		fmt.Fprintf(w.writer, "CREATE SCHEMA [%s];\n\n", schema.Name)
+	}
+
+	// Phase 2: Create tables with columns
+	fmt.Fprintf(w.writer, "-- Tables for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writeCreateTable(schema, table); err != nil {
+			return err
+		}
+	}
+
+	// Phase 3: Primary keys
+	fmt.Fprintf(w.writer, "-- Primary keys for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writePrimaryKey(schema, table); err != nil {
+			return err
+		}
+	}
+
+	// Phase 4: Indexes
+	fmt.Fprintf(w.writer, "-- Indexes for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writeIndexes(schema, table); err != nil {
+			return err
+		}
+	}
+
+	// Phase 5: Unique constraints
+	fmt.Fprintf(w.writer, "-- Unique constraints for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writeUniqueConstraints(schema, table); err != nil {
+			return err
+		}
+	}
+
+	// Phase 6: Check constraints
+	fmt.Fprintf(w.writer, "-- Check constraints for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writeCheckConstraints(schema, table); err != nil {
+			return err
+		}
+	}
+
+	// Phase 7: Foreign keys
+	fmt.Fprintf(w.writer, "-- Foreign keys for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writeForeignKeys(schema, table); err != nil {
+			return err
+		}
+	}
+
+	// Phase 8: Comments
+	fmt.Fprintf(w.writer, "-- Comments for schema: %s\n", schema.Name)
+	for _, table := range schema.Tables {
+		if err := w.writeComments(schema, table); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// WriteTable writes a single table with all its elements
+func (w *Writer) WriteTable(table *models.Table) error {
+	if w.writer == nil {
+		w.writer = os.Stdout
+	}
+
+	// Create a temporary schema with just this table
+	schema := models.InitSchema(table.Schema)
+	schema.Tables = append(schema.Tables, table)
+
+	return w.WriteSchema(schema)
+}
+
+// writeCreateTable generates CREATE TABLE statement
+func (w *Writer) writeCreateTable(schema *models.Schema, table *models.Table) error {
+	fmt.Fprintf(w.writer, "CREATE TABLE %s (\n", w.qualTable(schema.Name, table.Name))
+
+	// Sort columns by sequence
+	columns := getSortedColumns(table.Columns)
+	columnDefs := make([]string, 0, len(columns))
+
+	for _, col := range columns {
+		def := w.generateColumnDefinition(col)
+		columnDefs = append(columnDefs, "  "+def)
+	}
+
+	fmt.Fprintf(w.writer, "%s\n", strings.Join(columnDefs, ",\n"))
+	fmt.Fprintf(w.writer, ");\n\n")
+
+	return nil
+}
+
+// generateColumnDefinition generates MSSQL column definition
+func (w *Writer) generateColumnDefinition(col *models.Column) string {
+	parts := []string{fmt.Sprintf("[%s]", col.Name)}
+
+	// Type with length/precision
+	baseType := mssql.ConvertCanonicalToMSSQL(col.Type)
+	typeStr := baseType
+
+	// Handle specific type parameters for MSSQL
+	if col.Length > 0 && col.Precision == 0 {
+		// String types with length - override the default length from baseType
+		if strings.HasPrefix(baseType, "NVARCHAR") || strings.HasPrefix(baseType, "VARCHAR") ||
+			strings.HasPrefix(baseType, "CHAR") || strings.HasPrefix(baseType, "NCHAR") {
+			if col.Length > 0 && col.Length < 8000 {
+				// Extract base type without length specification
+				baseName := strings.Split(baseType, "(")[0]
+				typeStr = fmt.Sprintf("%s(%d)", baseName, col.Length)
+			}
+		}
+	} else if col.Precision > 0 {
+		// Numeric types with precision/scale
+		baseName := strings.Split(baseType, "(")[0]
+		if col.Scale > 0 {
+			typeStr = fmt.Sprintf("%s(%d,%d)", baseName, col.Precision, col.Scale)
+		} else {
+			typeStr = fmt.Sprintf("%s(%d)", baseName, col.Precision)
+		}
+	}
+
+	parts = append(parts, typeStr)
+
+	// IDENTITY for auto-increment
+	if col.AutoIncrement {
+		parts = append(parts, "IDENTITY(1,1)")
+	}
+
+	// NOT NULL
+	if col.NotNull {
+		parts = append(parts, "NOT NULL")
+	}
+
+	// DEFAULT
+	if col.Default != nil {
+		switch v := col.Default.(type) {
+		case string:
+			cleanDefault := stripBackticks(v)
+			if strings.HasPrefix(strings.ToUpper(cleanDefault), "GETDATE") ||
+				strings.HasPrefix(strings.ToUpper(cleanDefault), "CURRENT_") {
+				parts = append(parts, fmt.Sprintf("DEFAULT %s", cleanDefault))
+			} else if cleanDefault == "true" || cleanDefault == "false" {
+				if cleanDefault == "true" {
+					parts = append(parts, "DEFAULT 1")
+				} else {
+					parts = append(parts, "DEFAULT 0")
+				}
+			} else {
+				parts = append(parts, fmt.Sprintf("DEFAULT '%s'", escapeQuote(cleanDefault)))
+			}
+		case bool:
+			if v {
+				parts = append(parts, "DEFAULT 1")
+			} else {
+				parts = append(parts, "DEFAULT 0")
+			}
+		case int, int64:
+			parts = append(parts, fmt.Sprintf("DEFAULT %v", v))
+		}
+	}
+
+	return strings.Join(parts, " ")
+}
+
+// writePrimaryKey generates ALTER TABLE statement for primary key
+func (w *Writer) writePrimaryKey(schema *models.Schema, table *models.Table) error {
+	// Find primary key constraint
+	var pkConstraint *models.Constraint
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.PrimaryKeyConstraint {
+			pkConstraint = constraint
+			break
+		}
+	}
+
+	var columnNames []string
+	pkName := fmt.Sprintf("PK_%s_%s", schema.Name, table.Name)
+
+	if pkConstraint != nil {
+		pkName = pkConstraint.Name
+		columnNames = make([]string, 0, len(pkConstraint.Columns))
+		for _, colName := range pkConstraint.Columns {
+			columnNames = append(columnNames, fmt.Sprintf("[%s]", colName))
+		}
+	} else {
+		// Check for columns with IsPrimaryKey = true
+		for _, col := range table.Columns {
+			if col.IsPrimaryKey {
+				columnNames = append(columnNames, fmt.Sprintf("[%s]", col.Name))
+			}
+		}
+		sort.Strings(columnNames)
+	}
+
+	if len(columnNames) == 0 {
+		return nil
+	}
+
+	fmt.Fprintf(w.writer, "ALTER TABLE %s ADD CONSTRAINT [%s] PRIMARY KEY (%s);\n\n",
+		w.qualTable(schema.Name, table.Name), pkName, strings.Join(columnNames, ", "))
+
+	return nil
+}
+
+// writeIndexes generates CREATE INDEX statements
+func (w *Writer) writeIndexes(schema *models.Schema, table *models.Table) error {
+	// Sort indexes by name
+	indexNames := make([]string, 0, len(table.Indexes))
+	for name := range table.Indexes {
+		indexNames = append(indexNames, name)
+	}
+	sort.Strings(indexNames)
+
+	for _, name := range indexNames {
+		index := table.Indexes[name]
+
+		// Skip if it's a primary key index
+		if strings.HasPrefix(strings.ToLower(index.Name), "pk_") {
+			continue
+		}
+
+		// Build column list
+		columnExprs := make([]string, 0, len(index.Columns))
+		for _, colName := range index.Columns {
+			columnExprs = append(columnExprs, fmt.Sprintf("[%s]", colName))
+		}
+
+		if len(columnExprs) == 0 {
+			continue
+		}
+
+		unique := ""
+		if index.Unique {
+			unique = "UNIQUE "
+		}
+
+		fmt.Fprintf(w.writer, "CREATE %sINDEX [%s] ON %s (%s);\n\n",
+			unique, index.Name, w.qualTable(schema.Name, table.Name), strings.Join(columnExprs, ", "))
+	}
+
+	return nil
+}
+
+// writeUniqueConstraints generates ALTER TABLE statements for unique constraints
+func (w *Writer) writeUniqueConstraints(schema *models.Schema, table *models.Table) error {
+	// Sort constraints by name
+	constraintNames := make([]string, 0)
+	for name, constraint := range table.Constraints {
+		if constraint.Type == models.UniqueConstraint {
+			constraintNames = append(constraintNames, name)
+		}
+	}
+	sort.Strings(constraintNames)
+
+	for _, name := range constraintNames {
+		constraint := table.Constraints[name]
+
+		// Build column list
+		columnExprs := make([]string, 0, len(constraint.Columns))
+		for _, colName := range constraint.Columns {
+			columnExprs = append(columnExprs, fmt.Sprintf("[%s]", colName))
+		}
+
+		if len(columnExprs) == 0 {
+			continue
+		}
+
+		fmt.Fprintf(w.writer, "ALTER TABLE %s ADD CONSTRAINT [%s] UNIQUE (%s);\n\n",
+			w.qualTable(schema.Name, table.Name), constraint.Name, strings.Join(columnExprs, ", "))
+	}
+
+	return nil
+}
+
+// writeCheckConstraints generates ALTER TABLE statements for check constraints
+func (w *Writer) writeCheckConstraints(schema *models.Schema, table *models.Table) error {
+	// Sort constraints by name
+	constraintNames := make([]string, 0)
+	for name, constraint := range table.Constraints {
+		if constraint.Type == models.CheckConstraint {
+			constraintNames = append(constraintNames, name)
+		}
+	}
+	sort.Strings(constraintNames)
+
+	for _, name := range constraintNames {
+		constraint := table.Constraints[name]
+
+		if constraint.Expression == "" {
+			continue
+		}
+
+		fmt.Fprintf(w.writer, "ALTER TABLE %s ADD CONSTRAINT [%s] CHECK (%s);\n\n",
+			w.qualTable(schema.Name, table.Name), constraint.Name, constraint.Expression)
+	}
+
+	return nil
+}
+
+// writeForeignKeys generates ALTER TABLE statements for foreign keys
+func (w *Writer) writeForeignKeys(schema *models.Schema, table *models.Table) error {
+	// Process foreign key constraints
+	constraintNames := make([]string, 0)
+	for name, constraint := range table.Constraints {
+		if constraint.Type == models.ForeignKeyConstraint {
+			constraintNames = append(constraintNames, name)
+		}
+	}
+	sort.Strings(constraintNames)
+
+	for _, name := range constraintNames {
+		constraint := table.Constraints[name]
+
+		// Build column lists
+		sourceColumns := make([]string, 0, len(constraint.Columns))
+		for _, colName := range constraint.Columns {
+			sourceColumns = append(sourceColumns, fmt.Sprintf("[%s]", colName))
+		}
+
+		targetColumns := make([]string, 0, len(constraint.ReferencedColumns))
+		for _, colName := range constraint.ReferencedColumns {
+			targetColumns = append(targetColumns, fmt.Sprintf("[%s]", colName))
+		}
+
+		if len(sourceColumns) == 0 || len(targetColumns) == 0 {
+			continue
+		}
+
+		refSchema := constraint.ReferencedSchema
+		if refSchema == "" {
+			refSchema = schema.Name
+		}
+
+		onDelete := "NO ACTION"
+		if constraint.OnDelete != "" {
+			onDelete = strings.ToUpper(constraint.OnDelete)
+		}
+
+		onUpdate := "NO ACTION"
+		if constraint.OnUpdate != "" {
+			onUpdate = strings.ToUpper(constraint.OnUpdate)
+		}
+
+		fmt.Fprintf(w.writer, "ALTER TABLE %s ADD CONSTRAINT [%s] FOREIGN KEY (%s)\n",
+			w.qualTable(schema.Name, table.Name), constraint.Name, strings.Join(sourceColumns, ", "))
+		fmt.Fprintf(w.writer, "  REFERENCES %s (%s)\n",
+			w.qualTable(refSchema, constraint.ReferencedTable), strings.Join(targetColumns, ", "))
+		fmt.Fprintf(w.writer, "  ON DELETE %s ON UPDATE %s;\n\n",
+			onDelete, onUpdate)
+	}
+
+	return nil
+}
+
+// writeComments generates EXEC sp_addextendedproperty statements for table and column descriptions
+func (w *Writer) writeComments(schema *models.Schema, table *models.Table) error {
+	// Table comment
+	if table.Description != "" {
+		fmt.Fprintf(w.writer, "EXEC sp_addextendedproperty\n")
+		fmt.Fprintf(w.writer, "  @name = 'MS_Description',\n")
+		fmt.Fprintf(w.writer, "  @value = '%s',\n", escapeQuote(table.Description))
+		fmt.Fprintf(w.writer, "  @level0type = 'SCHEMA', @level0name = '%s',\n", schema.Name)
+		fmt.Fprintf(w.writer, "  @level1type = 'TABLE', @level1name = '%s';\n\n", table.Name)
+	}
+
+	// Column comments
+	for _, col := range getSortedColumns(table.Columns) {
+		if col.Description != "" {
+			fmt.Fprintf(w.writer, "EXEC sp_addextendedproperty\n")
+			fmt.Fprintf(w.writer, "  @name = 'MS_Description',\n")
+			fmt.Fprintf(w.writer, "  @value = '%s',\n", escapeQuote(col.Description))
+			fmt.Fprintf(w.writer, "  @level0type = 'SCHEMA', @level0name = '%s',\n", schema.Name)
+			fmt.Fprintf(w.writer, "  @level1type = 'TABLE', @level1name = '%s',\n", table.Name)
+			fmt.Fprintf(w.writer, "  @level2type = 'COLUMN', @level2name = '%s';\n\n", col.Name)
+		}
+	}
+
+	return nil
+}
+
+// executeDatabaseSQL executes SQL statements directly on an MSSQL database
+func (w *Writer) executeDatabaseSQL(db *models.Database, connString string) error {
+	// Generate SQL statements
+	statements := []string{}
+	statements = append(statements, "-- MSSQL Database Schema")
+	statements = append(statements, fmt.Sprintf("-- Database: %s", db.Name))
+	statements = append(statements, "-- Generated by RelSpec")
+
+	for _, schema := range db.Schemas {
+		if err := w.generateSchemaStatements(schema, &statements); err != nil {
+			return fmt.Errorf("failed to generate statements for schema %s: %w", schema.Name, err)
+		}
+	}
+
+	// Connect to database
+	dbConn, err := sql.Open("mssql", connString)
+	if err != nil {
+		return fmt.Errorf("failed to connect to database: %w", err)
+	}
+	defer dbConn.Close()
+
+	ctx := context.Background()
+	if err = dbConn.PingContext(ctx); err != nil {
+		return fmt.Errorf("failed to ping database: %w", err)
+	}
+
+	// Execute statements
+	executedCount := 0
+	for i, stmt := range statements {
+		stmtTrimmed := strings.TrimSpace(stmt)
+
+		// Skip comments and empty statements
+		if strings.HasPrefix(stmtTrimmed, "--") || stmtTrimmed == "" {
+			continue
+		}
+
+		fmt.Fprintf(os.Stderr, "Executing statement %d/%d...\n", i+1, len(statements))
+
+		_, execErr := dbConn.ExecContext(ctx, stmt)
+		if execErr != nil {
+			fmt.Fprintf(os.Stderr, "⚠ Warning: Statement failed: %v\n", execErr)
+			continue
+		}
+
+		executedCount++
+	}
+
+	fmt.Fprintf(os.Stderr, "✓ Successfully executed %d statements\n", executedCount)
+	return nil
+}
+
+// generateSchemaStatements generates SQL statements for a schema
+func (w *Writer) generateSchemaStatements(schema *models.Schema, statements *[]string) error {
+	// Phase 1: Create schema
+	if schema.Name != "dbo" && !w.options.FlattenSchema {
+		*statements = append(*statements, fmt.Sprintf("-- Schema: %s", schema.Name))
+		*statements = append(*statements, fmt.Sprintf("CREATE SCHEMA [%s];", schema.Name))
+	}
+
+	// Phase 2: Create tables
+	*statements = append(*statements, fmt.Sprintf("-- Tables for schema: %s", schema.Name))
+	for _, table := range schema.Tables {
+		createTableSQL := fmt.Sprintf("CREATE TABLE %s (", w.qualTable(schema.Name, table.Name))
+		columnDefs := make([]string, 0)
+
+		columns := getSortedColumns(table.Columns)
+		for _, col := range columns {
+			def := w.generateColumnDefinition(col)
+			columnDefs = append(columnDefs, "  "+def)
+		}
+
+		createTableSQL += "\n" + strings.Join(columnDefs, ",\n") + "\n)"
+		*statements = append(*statements, createTableSQL)
+	}
+
+	// Phase 3-7: Constraints and indexes will be added by WriteSchema logic
+	// For now, just create tables
+	return nil
+}
+
+// Helper functions
+
+// getSortedColumns returns columns sorted by sequence
+func getSortedColumns(columns map[string]*models.Column) []*models.Column {
+	names := make([]string, 0, len(columns))
+	for name := range columns {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+
+	sorted := make([]*models.Column, 0, len(columns))
+	for _, name := range names {
+		sorted = append(sorted, columns[name])
+	}
+	return sorted
+}
+
+// escapeQuote escapes single quotes in strings for SQL
+func escapeQuote(s string) string {
+	return strings.ReplaceAll(s, "'", "''")
+}
+
+// stripBackticks removes backticks from SQL expressions
+func stripBackticks(s string) string {
+	return strings.ReplaceAll(s, "`", "")
+}

pkg/writers/mssql/writer_test.go

@@ -0,0 +1,205 @@
+package mssql
+
+import (
+	"bytes"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+	"github.com/stretchr/testify/assert"
+)
+
+// TestGenerateColumnDefinition tests column definition generation
+func TestGenerateColumnDefinition(t *testing.T) {
+	writer := NewWriter(&writers.WriterOptions{})
+
+	tests := []struct {
+		name     string
+		column   *models.Column
+		expected string
+	}{
+		{
+			name: "INT NOT NULL",
+			column: &models.Column{
+				Name:     "id",
+				Type:     "int",
+				NotNull:  true,
+				Sequence: 1,
+			},
+			expected: "[id] INT NOT NULL",
+		},
+		{
+			name: "VARCHAR with length",
+			column: &models.Column{
+				Name:     "name",
+				Type:     "string",
+				Length:   100,
+				NotNull:  true,
+				Sequence: 2,
+			},
+			expected: "[name] NVARCHAR(100) NOT NULL",
+		},
+		{
+			name: "DATETIME2 with default",
+			column: &models.Column{
+				Name:     "created_at",
+				Type:     "timestamp",
+				NotNull:  true,
+				Default:  "GETDATE()",
+				Sequence: 3,
+			},
+			expected: "[created_at] DATETIME2 NOT NULL DEFAULT GETDATE()",
+		},
+		{
+			name: "IDENTITY column",
+			column: &models.Column{
+				Name:          "id",
+				Type:          "int",
+				AutoIncrement: true,
+				NotNull:       true,
+				Sequence:      1,
+			},
+			expected: "[id] INT IDENTITY(1,1) NOT NULL",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := writer.generateColumnDefinition(tt.column)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+// TestWriteCreateTable tests CREATE TABLE statement generation
+func TestWriteCreateTable(t *testing.T) {
+	writer := NewWriter(&writers.WriterOptions{})
+
+	// Create a test schema with a table
+	schema := models.InitSchema("dbo")
+	table := models.InitTable("users", "dbo")
+
+	col1 := models.InitColumn("id", "users", "dbo")
+	col1.Type = "int"
+	col1.AutoIncrement = true
+	col1.NotNull = true
+	col1.Sequence = 1
+
+	col2 := models.InitColumn("email", "users", "dbo")
+	col2.Type = "string"
+	col2.Length = 255
+	col2.NotNull = true
+	col2.Sequence = 2
+
+	table.Columns["id"] = col1
+	table.Columns["email"] = col2
+
+	// Write to buffer
+	buf := &bytes.Buffer{}
+	writer.writer = buf
+
+	err := writer.writeCreateTable(schema, table)
+	assert.NoError(t, err)
+
+	output := buf.String()
+	assert.Contains(t, output, "CREATE TABLE [dbo].[users]")
+	assert.Contains(t, output, "[id] INT IDENTITY(1,1) NOT NULL")
+	assert.Contains(t, output, "[email] NVARCHAR(255) NOT NULL")
+}
+
+// TestWritePrimaryKey tests PRIMARY KEY constraint generation
+func TestWritePrimaryKey(t *testing.T) {
+	writer := NewWriter(&writers.WriterOptions{})
+
+	schema := models.InitSchema("dbo")
+	table := models.InitTable("users", "dbo")
+
+	// Add primary key constraint
+	pk := models.InitConstraint("PK_users_id", models.PrimaryKeyConstraint)
+	pk.Columns = []string{"id"}
+	table.Constraints[pk.Name] = pk
+
+	// Add column
+	col := models.InitColumn("id", "users", "dbo")
+	col.Type = "int"
+	col.Sequence = 1
+	table.Columns["id"] = col
+
+	// Write to buffer
+	buf := &bytes.Buffer{}
+	writer.writer = buf
+
+	err := writer.writePrimaryKey(schema, table)
+	assert.NoError(t, err)
+
+	output := buf.String()
+	assert.Contains(t, output, "ALTER TABLE [dbo].[users]")
+	assert.Contains(t, output, "PRIMARY KEY")
+	assert.Contains(t, output, "[id]")
+}
+
+// TestWriteForeignKey tests FOREIGN KEY constraint generation
+func TestWriteForeignKey(t *testing.T) {
+	writer := NewWriter(&writers.WriterOptions{})
+
+	schema := models.InitSchema("dbo")
+	table := models.InitTable("orders", "dbo")
+
+	// Add foreign key constraint
+	fk := models.InitConstraint("FK_orders_users", models.ForeignKeyConstraint)
+	fk.Columns = []string{"user_id"}
+	fk.ReferencedSchema = "dbo"
+	fk.ReferencedTable = "users"
+	fk.ReferencedColumns = []string{"id"}
+	fk.OnDelete = "CASCADE"
+	fk.OnUpdate = "NO ACTION"
+	table.Constraints[fk.Name] = fk
+
+	// Add column
+	col := models.InitColumn("user_id", "orders", "dbo")
+	col.Type = "int"
+	col.Sequence = 1
+	table.Columns["user_id"] = col
+
+	// Write to buffer
+	buf := &bytes.Buffer{}
+	writer.writer = buf
+
+	err := writer.writeForeignKeys(schema, table)
+	assert.NoError(t, err)
+
+	output := buf.String()
+	assert.Contains(t, output, "ALTER TABLE [dbo].[orders]")
+	assert.Contains(t, output, "FK_orders_users")
+	assert.Contains(t, output, "FOREIGN KEY")
+	assert.Contains(t, output, "CASCADE")
+	assert.Contains(t, output, "NO ACTION")
+}
+
+// TestWriteComments tests extended property generation for comments
+func TestWriteComments(t *testing.T) {
+	writer := NewWriter(&writers.WriterOptions{})
+
+	schema := models.InitSchema("dbo")
+	table := models.InitTable("users", "dbo")
+	table.Description = "User accounts table"
+
+	col := models.InitColumn("id", "users", "dbo")
+	col.Type = "int"
+	col.Description = "Primary key"
+	col.Sequence = 1
+	table.Columns["id"] = col
+
+	// Write to buffer
+	buf := &bytes.Buffer{}
+	writer.writer = buf
+
+	err := writer.writeComments(schema, table)
+	assert.NoError(t, err)
+
+	output := buf.String()
+	assert.Contains(t, output, "sp_addextendedproperty")
+	assert.Contains(t, output, "MS_Description")
+	assert.Contains(t, output, "User accounts table")
+	assert.Contains(t, output, "Primary key")
+}

pkg/writers/sqlite/README.md

@@ -0,0 +1,215 @@
+# SQLite Writer
+
+SQLite DDL (Data Definition Language) writer for RelSpec. Converts database schemas to SQLite-compatible SQL statements.
+
+## Features
+
+- **Automatic Schema Flattening** - SQLite doesn't support PostgreSQL-style schemas, so table names are automatically flattened (e.g., `public.users` → `public_users`)
+- **Type Mapping** - Converts PostgreSQL data types to SQLite type affinities (TEXT, INTEGER, REAL, NUMERIC, BLOB)
+- **Auto-Increment Detection** - Automatically converts SERIAL types and auto-increment columns to `INTEGER PRIMARY KEY AUTOINCREMENT`
+- **Function Translation** - Converts PostgreSQL functions to SQLite equivalents (e.g., `now()` → `CURRENT_TIMESTAMP`)
+- **Boolean Handling** - Maps boolean values to INTEGER (true=1, false=0)
+- **Constraint Generation** - Creates indexes, unique constraints, and documents foreign keys
+- **Identifier Quoting** - Properly quotes identifiers using double quotes
+
+## Usage
+
+### Convert PostgreSQL to SQLite
+
+```bash
+relspec convert --from pgsql --from-conn "postgres://user:pass@localhost/mydb" \
+                --to sqlite --to-path schema.sql
+```
+
+### Convert DBML to SQLite
+
+```bash
+relspec convert --from dbml --from-path schema.dbml \
+                --to sqlite --to-path schema.sql
+```
+
+### Multi-Schema Databases
+
+SQLite doesn't support schemas, so multi-schema databases are automatically flattened:
+
+```bash
+# Input has auth.users and public.posts
+# Output will have auth_users and public_posts
+relspec convert --from json --from-path multi_schema.json \
+                --to sqlite --to-path flattened.sql
+```
+
+## Type Mapping
+
+| PostgreSQL Type | SQLite Affinity | Examples |
+|----------------|-----------------|----------|
+| TEXT | TEXT | varchar, text, char, citext, uuid, timestamp, json |
+| INTEGER | INTEGER | int, integer, smallint, bigint, serial, boolean |
+| REAL | REAL | real, float, double precision |
+| NUMERIC | NUMERIC | numeric, decimal |
+| BLOB | BLOB | bytea, blob |
+
+## Auto-Increment Handling
+
+Columns are converted to `INTEGER PRIMARY KEY AUTOINCREMENT` when they meet these criteria:
+- Marked as primary key
+- Integer type
+- Have `AutoIncrement` flag set, OR
+- Type contains "serial", OR
+- Default value contains "nextval"
+
+**Example:**
+
+```sql
+-- Input (PostgreSQL)
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100)
+);
+
+-- Output (SQLite)
+CREATE TABLE "users" (
+    "id" INTEGER PRIMARY KEY AUTOINCREMENT,
+    "name" TEXT
+);
+```
+
+## Default Value Translation
+
+| PostgreSQL | SQLite | Notes |
+|-----------|--------|-------|
+| `now()`, `CURRENT_TIMESTAMP` | `CURRENT_TIMESTAMP` | Timestamp functions |
+| `CURRENT_DATE` | `CURRENT_DATE` | Date function |
+| `CURRENT_TIME` | `CURRENT_TIME` | Time function |
+| `true`, `false` | `1`, `0` | Boolean values |
+| `gen_random_uuid()` | *(removed)* | SQLite has no built-in UUID |
+| `nextval(...)` | *(removed)* | Handled by AUTOINCREMENT |
+
+## Foreign Keys
+
+Foreign keys are generated as commented-out ALTER TABLE statements for reference:
+
+```sql
+-- Foreign key: fk_posts_user_id
+-- ALTER TABLE "posts" ADD CONSTRAINT "posts_fk_posts_user_id"
+--   FOREIGN KEY ("user_id")
+--   REFERENCES "users" ("id");
+-- Note: Foreign keys should be defined in CREATE TABLE for better SQLite compatibility
+```
+
+For production use, define foreign keys directly in the CREATE TABLE statement or execute the ALTER TABLE commands after creating all tables.
+
+## Constraints
+
+- **Primary Keys**: Inline for auto-increment columns, separate constraint for composite keys
+- **Unique Constraints**: Converted to `CREATE UNIQUE INDEX` statements
+- **Check Constraints**: Generated as comments (should be added to CREATE TABLE manually)
+- **Indexes**: Generated without PostgreSQL-specific features (no GIN, GiST, operator classes)
+
+## Output Structure
+
+Generated SQL follows this order:
+
+1. Header comments
+2. `PRAGMA foreign_keys = ON;`
+3. CREATE TABLE statements (sorted by schema, then table)
+4. CREATE INDEX statements
+5. CREATE UNIQUE INDEX statements (for unique constraints)
+6. Check constraint comments
+7. Foreign key comments
+
+## Example
+
+**Input (multi-schema PostgreSQL):**
+
+```sql
+CREATE SCHEMA auth;
+CREATE TABLE auth.users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    created_at TIMESTAMP DEFAULT now()
+);
+
+CREATE SCHEMA public;
+CREATE TABLE public.posts (
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER REFERENCES auth.users(id),
+    title VARCHAR(200) NOT NULL,
+    published BOOLEAN DEFAULT false
+);
+```
+
+**Output (SQLite with flattened schemas):**
+
+```sql
+-- SQLite Database Schema
+-- Database: mydb
+-- Generated by RelSpec
+-- Note: Schema names have been flattened (e.g., public.users -> public_users)
+
+-- Enable foreign key constraints
+PRAGMA foreign_keys = ON;
+
+-- Schema: auth (flattened into table names)
+
+CREATE TABLE "auth_users" (
+    "id" INTEGER PRIMARY KEY AUTOINCREMENT,
+    "username" TEXT NOT NULL,
+    "created_at" TEXT DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE UNIQUE INDEX "auth_users_users_username_key" ON "auth_users" ("username");
+
+-- Schema: public (flattened into table names)
+
+CREATE TABLE "public_posts" (
+    "id" INTEGER PRIMARY KEY AUTOINCREMENT,
+    "user_id" INTEGER NOT NULL,
+    "title" TEXT NOT NULL,
+    "published" INTEGER DEFAULT 0
+);
+
+-- Foreign key: posts_user_id_fkey
+-- ALTER TABLE "public_posts" ADD CONSTRAINT "public_posts_posts_user_id_fkey"
+--   FOREIGN KEY ("user_id")
+--   REFERENCES "auth_users" ("id");
+-- Note: Foreign keys should be defined in CREATE TABLE for better SQLite compatibility
+```
+
+## Programmatic Usage
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/models"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers"
+    "git.warky.dev/wdevs/relspecgo/pkg/writers/sqlite"
+)
+
+func main() {
+    // Create writer (automatically enables schema flattening)
+    writer := sqlite.NewWriter(&writers.WriterOptions{
+        OutputPath: "schema.sql",
+    })
+
+    // Write database schema
+    db := &models.Database{
+        Name: "mydb",
+        Schemas: []*models.Schema{
+            // ... your schema data
+        },
+    }
+
+    err := writer.WriteDatabase(db)
+    if err != nil {
+        panic(err)
+    }
+}
+```
+
+## Notes
+
+- Schema flattening is **always enabled** for SQLite output (cannot be disabled)
+- Constraint and index names are prefixed with the flattened table name to avoid collisions
+- Generated SQL is compatible with SQLite 3.x
+- Foreign key constraints require `PRAGMA foreign_keys = ON;` to be enforced
+- For complex schemas, review and test the generated SQL before use in production

pkg/writers/sqlite/datatypes.go

@@ -0,0 +1,89 @@
+package sqlite
+
+import (
+	"strings"
+)
+
+// SQLite type affinities
+const (
+	TypeText    = "TEXT"
+	TypeInteger = "INTEGER"
+	TypeReal    = "REAL"
+	TypeNumeric = "NUMERIC"
+	TypeBlob    = "BLOB"
+)
+
+// MapPostgreSQLType maps PostgreSQL data types to SQLite type affinities
+func MapPostgreSQLType(pgType string) string {
+	// Normalize the type
+	normalized := strings.ToLower(strings.TrimSpace(pgType))
+
+	// Remove array notation if present
+	normalized = strings.TrimSuffix(normalized, "[]")
+
+	// Remove precision/scale if present
+	if idx := strings.Index(normalized, "("); idx != -1 {
+		normalized = normalized[:idx]
+	}
+
+	// Map to SQLite type affinity
+	switch normalized {
+	// TEXT affinity
+	case "varchar", "character varying", "text", "char", "character",
+		"citext", "uuid", "timestamp", "timestamptz", "timestamp with time zone",
+		"timestamp without time zone", "date", "time", "timetz", "time with time zone",
+		"time without time zone", "json", "jsonb", "xml", "inet", "cidr", "macaddr":
+		return TypeText
+
+	// INTEGER affinity
+	case "int", "int2", "int4", "int8", "integer", "smallint", "bigint",
+		"serial", "smallserial", "bigserial", "boolean", "bool":
+		return TypeInteger
+
+	// REAL affinity
+	case "real", "float", "float4", "float8", "double precision":
+		return TypeReal
+
+	// NUMERIC affinity
+	case "numeric", "decimal", "money":
+		return TypeNumeric
+
+	// BLOB affinity
+	case "bytea", "blob":
+		return TypeBlob
+
+	default:
+		// Default to TEXT for unknown types
+		return TypeText
+	}
+}
+
+// IsIntegerType checks if a column type should be treated as integer
+func IsIntegerType(colType string) bool {
+	normalized := strings.ToLower(strings.TrimSpace(colType))
+	normalized = strings.TrimSuffix(normalized, "[]")
+	if idx := strings.Index(normalized, "("); idx != -1 {
+		normalized = normalized[:idx]
+	}
+
+	switch normalized {
+	case "int", "int2", "int4", "int8", "integer", "smallint", "bigint",
+		"serial", "smallserial", "bigserial":
+		return true
+	default:
+		return false
+	}
+}
+
+// MapBooleanValue converts PostgreSQL boolean literals to SQLite (0/1)
+func MapBooleanValue(value string) string {
+	normalized := strings.ToLower(strings.TrimSpace(value))
+	switch normalized {
+	case "true", "t", "yes", "y", "1":
+		return "1"
+	case "false", "f", "no", "n", "0":
+		return "0"
+	default:
+		return value
+	}
+}

pkg/writers/sqlite/template_functions.go

@@ -0,0 +1,146 @@
+package sqlite
+
+import (
+	"fmt"
+	"strings"
+	"text/template"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+// GetTemplateFuncs returns template functions for SQLite SQL generation
+func GetTemplateFuncs(opts *writers.WriterOptions) template.FuncMap {
+	return template.FuncMap{
+		"quote_ident":      QuoteIdentifier,
+		"map_type":         MapPostgreSQLType,
+		"is_autoincrement": IsAutoIncrementCandidate,
+		"qualified_table_name": func(schema, table string) string {
+			return writers.QualifiedTableName(schema, table, opts.FlattenSchema)
+		},
+		"format_default": FormatDefault,
+		"format_constraint_name": func(schema, table, constraint string) string {
+			return FormatConstraintName(schema, table, constraint, opts)
+		},
+		"join":  strings.Join,
+		"lower": strings.ToLower,
+		"upper": strings.ToUpper,
+	}
+}
+
+// QuoteIdentifier quotes an identifier for SQLite (double quotes)
+func QuoteIdentifier(name string) string {
+	// SQLite uses double quotes for identifiers
+	// Escape any existing double quotes by doubling them
+	escaped := strings.ReplaceAll(name, `"`, `""`)
+	return fmt.Sprintf(`"%s"`, escaped)
+}
+
+// IsAutoIncrementCandidate checks if a column should use AUTOINCREMENT
+func IsAutoIncrementCandidate(col *models.Column) bool {
+	// Must be a primary key
+	if !col.IsPrimaryKey {
+		return false
+	}
+
+	// Must be an integer type
+	if !IsIntegerType(col.Type) {
+		return false
+	}
+
+	// Check AutoIncrement field
+	if col.AutoIncrement {
+		return true
+	}
+
+	// Check if default suggests auto-increment
+	if col.Default != nil {
+		defaultStr, ok := col.Default.(string)
+		if ok {
+			defaultLower := strings.ToLower(defaultStr)
+			if strings.Contains(defaultLower, "nextval") ||
+				strings.Contains(defaultLower, "autoincrement") ||
+				strings.Contains(defaultLower, "auto_increment") {
+				return true
+			}
+		}
+	}
+
+	// Serial types are auto-increment
+	typeLower := strings.ToLower(col.Type)
+	return strings.Contains(typeLower, "serial")
+}
+
+// FormatDefault formats a default value for SQLite
+func FormatDefault(col *models.Column) string {
+	if col.Default == nil {
+		return ""
+	}
+
+	// Skip auto-increment defaults (handled by AUTOINCREMENT keyword)
+	if IsAutoIncrementCandidate(col) {
+		return ""
+	}
+
+	// Convert to string
+	defaultStr, ok := col.Default.(string)
+	if !ok {
+		// If not a string, convert to string representation
+		defaultStr = fmt.Sprintf("%v", col.Default)
+	}
+
+	if defaultStr == "" {
+		return ""
+	}
+
+	// Convert PostgreSQL-specific functions to SQLite equivalents
+	defaultLower := strings.ToLower(defaultStr)
+
+	// Current timestamp functions
+	if strings.Contains(defaultLower, "current_timestamp") ||
+		strings.Contains(defaultLower, "now()") {
+		return "CURRENT_TIMESTAMP"
+	}
+
+	// Current date
+	if strings.Contains(defaultLower, "current_date") {
+		return "CURRENT_DATE"
+	}
+
+	// Current time
+	if strings.Contains(defaultLower, "current_time") {
+		return "CURRENT_TIME"
+	}
+
+	// Boolean values
+	sqliteType := MapPostgreSQLType(col.Type)
+	if sqliteType == TypeInteger {
+		typeLower := strings.ToLower(col.Type)
+		if strings.Contains(typeLower, "bool") {
+			return MapBooleanValue(defaultStr)
+		}
+	}
+
+	// UUID generation - SQLite doesn't have built-in UUID, comment it out
+	if strings.Contains(defaultLower, "uuid") || strings.Contains(defaultLower, "gen_random_uuid") {
+		return "" // Remove UUID defaults, users must handle this
+	}
+
+	// Remove PostgreSQL-specific casting
+	defaultStr = strings.ReplaceAll(defaultStr, "::text", "")
+	defaultStr = strings.ReplaceAll(defaultStr, "::integer", "")
+	defaultStr = strings.ReplaceAll(defaultStr, "::bigint", "")
+	defaultStr = strings.ReplaceAll(defaultStr, "::boolean", "")
+
+	return defaultStr
+}
+
+// FormatConstraintName formats a constraint name with table prefix if flattening
+func FormatConstraintName(schema, table, constraint string, opts *writers.WriterOptions) string {
+	if opts.FlattenSchema && schema != "" {
+		// Prefix constraint with flattened table name
+		flatTable := writers.QualifiedTableName(schema, table, opts.FlattenSchema)
+		return fmt.Sprintf("%s_%s", flatTable, constraint)
+	}
+	return constraint
+}

pkg/writers/sqlite/templates.go

@@ -0,0 +1,174 @@
+package sqlite
+
+import (
+	"bytes"
+	"embed"
+	"fmt"
+	"text/template"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+//go:embed templates/*.tmpl
+var templateFS embed.FS
+
+// TemplateExecutor manages and executes SQLite SQL templates
+type TemplateExecutor struct {
+	templates *template.Template
+	options   *writers.WriterOptions
+}
+
+// NewTemplateExecutor creates a new template executor for SQLite
+func NewTemplateExecutor(opts *writers.WriterOptions) (*TemplateExecutor, error) {
+	// Create template with SQLite-specific functions
+	funcMap := GetTemplateFuncs(opts)
+
+	tmpl, err := template.New("").Funcs(funcMap).ParseFS(templateFS, "templates/*.tmpl")
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse templates: %w", err)
+	}
+
+	return &TemplateExecutor{
+		templates: tmpl,
+		options:   opts,
+	}, nil
+}
+
+// Template data structures
+
+// TableTemplateData contains data for table template
+type TableTemplateData struct {
+	Schema     string
+	Name       string
+	Columns    []*models.Column
+	PrimaryKey *models.Constraint
+}
+
+// IndexTemplateData contains data for index template
+type IndexTemplateData struct {
+	Schema  string
+	Table   string
+	Name    string
+	Columns []string
+}
+
+// ConstraintTemplateData contains data for constraint templates
+type ConstraintTemplateData struct {
+	Schema         string
+	Table          string
+	Name           string
+	Columns        []string
+	Expression     string
+	ForeignSchema  string
+	ForeignTable   string
+	ForeignColumns []string
+	OnDelete       string
+	OnUpdate       string
+}
+
+// Execute methods
+
+// ExecutePragmaForeignKeys executes the pragma foreign keys template
+func (te *TemplateExecutor) ExecutePragmaForeignKeys() (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "pragma_foreign_keys.tmpl", nil)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute pragma_foreign_keys template: %w", err)
+	}
+	return buf.String(), nil
+}
+
+// ExecuteCreateTable executes the create table template
+func (te *TemplateExecutor) ExecuteCreateTable(data TableTemplateData) (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "create_table.tmpl", data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute create_table template: %w", err)
+	}
+	return buf.String(), nil
+}
+
+// ExecuteCreateIndex executes the create index template
+func (te *TemplateExecutor) ExecuteCreateIndex(data IndexTemplateData) (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "create_index.tmpl", data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute create_index template: %w", err)
+	}
+	return buf.String(), nil
+}
+
+// ExecuteCreateUniqueConstraint executes the create unique constraint template
+func (te *TemplateExecutor) ExecuteCreateUniqueConstraint(data ConstraintTemplateData) (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "create_unique_constraint.tmpl", data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute create_unique_constraint template: %w", err)
+	}
+	return buf.String(), nil
+}
+
+// ExecuteCreateCheckConstraint executes the create check constraint template
+func (te *TemplateExecutor) ExecuteCreateCheckConstraint(data ConstraintTemplateData) (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "create_check_constraint.tmpl", data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute create_check_constraint template: %w", err)
+	}
+	return buf.String(), nil
+}
+
+// ExecuteCreateForeignKey executes the create foreign key template
+func (te *TemplateExecutor) ExecuteCreateForeignKey(data ConstraintTemplateData) (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "create_foreign_key.tmpl", data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute create_foreign_key template: %w", err)
+	}
+	return buf.String(), nil
+}
+
+// Helper functions to build template data from models
+
+// BuildTableTemplateData builds TableTemplateData from a models.Table
+func BuildTableTemplateData(schema string, table *models.Table) TableTemplateData {
+	// Get sorted columns
+	columns := make([]*models.Column, 0, len(table.Columns))
+	for _, col := range table.Columns {
+		columns = append(columns, col)
+	}
+
+	// Find primary key constraint
+	var pk *models.Constraint
+	for _, constraint := range table.Constraints {
+		if constraint.Type == models.PrimaryKeyConstraint {
+			pk = constraint
+			break
+		}
+	}
+
+	// If no explicit primary key constraint, build one from columns with IsPrimaryKey=true
+	if pk == nil {
+		pkCols := []string{}
+		for _, col := range table.Columns {
+			if col.IsPrimaryKey {
+				pkCols = append(pkCols, col.Name)
+			}
+		}
+		if len(pkCols) > 0 {
+			pk = &models.Constraint{
+				Name:    "pk_" + table.Name,
+				Type:    models.PrimaryKeyConstraint,
+				Columns: pkCols,
+			}
+		}
+	}
+
+	return TableTemplateData{
+		Schema:     schema,
+		Name:       table.Name,
+		Columns:    columns,
+		PrimaryKey: pk,
+	}
+}

pkg/writers/sqlite/templates/create_check_constraint.tmpl

@@ -0,0 +1,4 @@
+-- Check constraint: {{.Name}}
+-- {{.Expression}}
+-- Note: SQLite supports CHECK constraints in CREATE TABLE or ALTER TABLE ADD CHECK
+-- This must be added manually to the table definition above

pkg/writers/sqlite/templates/create_foreign_key.tmpl

@@ -0,0 +1,6 @@
+-- Foreign key: {{.Name}}
+-- ALTER TABLE {{quote_ident (qualified_table_name .Schema .Table)}} ADD CONSTRAINT {{quote_ident (format_constraint_name .Schema .Table .Name)}}
+--   FOREIGN KEY ({{range $i, $col := .Columns}}{{if $i}}, {{end}}{{quote_ident $col}}{{end}})
+--   REFERENCES {{quote_ident (qualified_table_name .ForeignSchema .ForeignTable)}} ({{range $i, $col := .ForeignColumns}}{{if $i}}, {{end}}{{quote_ident $col}}{{end}})
+--   {{if .OnDelete}}ON DELETE {{.OnDelete}}{{end}}{{if .OnUpdate}} ON UPDATE {{.OnUpdate}}{{end}};
+-- Note: Foreign keys should be defined in CREATE TABLE for better SQLite compatibility

pkg/writers/sqlite/templates/create_index.tmpl

@@ -0,0 +1 @@
+CREATE INDEX {{quote_ident (format_constraint_name .Schema .Table .Name)}} ON {{quote_ident (qualified_table_name .Schema .Table)}} ({{range $i, $col := .Columns}}{{if $i}}, {{end}}{{quote_ident $col}}{{end}});

pkg/writers/sqlite/templates/create_table.tmpl

@@ -0,0 +1,9 @@
+CREATE TABLE {{quote_ident (qualified_table_name .Schema .Name)}} (
+{{- $hasAutoIncrement := false}}
+{{- range $i, $col := .Columns}}{{if $i}},{{end}}
+    {{quote_ident $col.Name}} {{map_type $col.Type}}{{if is_autoincrement $col}}{{$hasAutoIncrement = true}} PRIMARY KEY AUTOINCREMENT{{else}}{{if $col.NotNull}} NOT NULL{{end}}{{if ne (format_default $col) ""}} DEFAULT {{format_default $col}}{{end}}{{end}}
+{{- end}}
+{{- if and .PrimaryKey (not $hasAutoIncrement)}}{{if gt (len .Columns) 0}},{{end}}
+    PRIMARY KEY ({{range $i, $colName := .PrimaryKey.Columns}}{{if $i}}, {{end}}{{quote_ident $colName}}{{end}})
+{{- end}}
+);

pkg/writers/sqlite/templates/create_unique_constraint.tmpl

@@ -0,0 +1 @@
+CREATE UNIQUE INDEX {{quote_ident (format_constraint_name .Schema .Table .Name)}} ON {{quote_ident (qualified_table_name .Schema .Table)}} ({{range $i, $col := .Columns}}{{if $i}}, {{end}}{{quote_ident $col}}{{end}});

pkg/writers/sqlite/templates/pragma_foreign_keys.tmpl

@@ -0,0 +1,2 @@
+-- Enable foreign key constraints
+PRAGMA foreign_keys = ON;

pkg/writers/sqlite/writer.go

@@ -0,0 +1,291 @@
+package sqlite
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+// Writer implements the Writer interface for SQLite SQL output
+type Writer struct {
+	options  *writers.WriterOptions
+	writer   io.Writer
+	executor *TemplateExecutor
+}
+
+// NewWriter creates a new SQLite SQL writer
+// SQLite doesn't support schemas, so FlattenSchema is automatically enabled
+func NewWriter(options *writers.WriterOptions) *Writer {
+	// Force schema flattening for SQLite
+	options.FlattenSchema = true
+
+	executor, _ := NewTemplateExecutor(options)
+	return &Writer{
+		options:  options,
+		executor: executor,
+	}
+}
+
+// WriteDatabase writes the entire database schema as SQLite SQL
+func (w *Writer) WriteDatabase(db *models.Database) error {
+	var writer io.Writer
+	var file *os.File
+	var err error
+
+	// Use existing writer if already set (for testing)
+	if w.writer != nil {
+		writer = w.writer
+	} else if w.options.OutputPath != "" {
+		// Determine output destination
+		file, err = os.Create(w.options.OutputPath)
+		if err != nil {
+			return fmt.Errorf("failed to create output file: %w", err)
+		}
+		defer file.Close()
+		writer = file
+	} else {
+		writer = os.Stdout
+	}
+
+	w.writer = writer
+
+	// Write header comment
+	fmt.Fprintf(w.writer, "-- SQLite Database Schema\n")
+	fmt.Fprintf(w.writer, "-- Database: %s\n", db.Name)
+	fmt.Fprintf(w.writer, "-- Generated by RelSpec\n")
+	fmt.Fprintf(w.writer, "-- Note: Schema names have been flattened (e.g., public.users -> public_users)\n\n")
+
+	// Enable foreign keys
+	pragma, err := w.executor.ExecutePragmaForeignKeys()
+	if err != nil {
+		return fmt.Errorf("failed to generate pragma statement: %w", err)
+	}
+	fmt.Fprintf(w.writer, "%s\n", pragma)
+
+	// Process each schema in the database
+	for _, schema := range db.Schemas {
+		if err := w.WriteSchema(schema); err != nil {
+			return fmt.Errorf("failed to write schema %s: %w", schema.Name, err)
+		}
+	}
+
+	return nil
+}
+
+// WriteSchema writes a single schema as SQLite SQL
+func (w *Writer) WriteSchema(schema *models.Schema) error {
+	// SQLite doesn't have schemas, so we just write a comment
+	if schema.Name != "" {
+		fmt.Fprintf(w.writer, "-- Schema: %s (flattened into table names)\n\n", schema.Name)
+	}
+
+	// Phase 1: Create tables
+	for _, table := range schema.Tables {
+		if err := w.writeTable(schema.Name, table); err != nil {
+			return fmt.Errorf("failed to write table %s: %w", table.Name, err)
+		}
+	}
+
+	// Phase 2: Create indexes
+	for _, table := range schema.Tables {
+		if err := w.writeIndexes(schema.Name, table); err != nil {
+			return fmt.Errorf("failed to write indexes for table %s: %w", table.Name, err)
+		}
+	}
+
+	// Phase 3: Create unique constraints (as unique indexes)
+	for _, table := range schema.Tables {
+		if err := w.writeUniqueConstraints(schema.Name, table); err != nil {
+			return fmt.Errorf("failed to write unique constraints for table %s: %w", table.Name, err)
+		}
+	}
+
+	// Phase 4: Check constraints (as comments, since SQLite requires them in CREATE TABLE)
+	for _, table := range schema.Tables {
+		if err := w.writeCheckConstraints(schema.Name, table); err != nil {
+			return fmt.Errorf("failed to write check constraints for table %s: %w", table.Name, err)
+		}
+	}
+
+	// Phase 5: Foreign keys (as comments for compatibility)
+	for _, table := range schema.Tables {
+		if err := w.writeForeignKeys(schema.Name, table); err != nil {
+			return fmt.Errorf("failed to write foreign keys for table %s: %w", table.Name, err)
+		}
+	}
+
+	return nil
+}
+
+// WriteTable writes a single table as SQLite SQL
+func (w *Writer) WriteTable(table *models.Table) error {
+	return w.writeTable("", table)
+}
+
+// writeTable is the internal implementation
+func (w *Writer) writeTable(schema string, table *models.Table) error {
+	// Build table template data
+	data := BuildTableTemplateData(schema, table)
+
+	// Execute template
+	sql, err := w.executor.ExecuteCreateTable(data)
+	if err != nil {
+		return fmt.Errorf("failed to execute create table template: %w", err)
+	}
+
+	fmt.Fprintf(w.writer, "%s\n", sql)
+	return nil
+}
+
+// writeIndexes writes indexes for a table
+func (w *Writer) writeIndexes(schema string, table *models.Table) error {
+	for _, index := range table.Indexes {
+		// Skip primary key indexes
+		if strings.HasSuffix(index.Name, "_pkey") {
+			continue
+		}
+
+		// Skip unique indexes (handled separately as unique constraints)
+		if index.Unique {
+			continue
+		}
+
+		data := IndexTemplateData{
+			Schema:  schema,
+			Table:   table.Name,
+			Name:    index.Name,
+			Columns: index.Columns,
+		}
+
+		sql, err := w.executor.ExecuteCreateIndex(data)
+		if err != nil {
+			return fmt.Errorf("failed to execute create index template: %w", err)
+		}
+
+		fmt.Fprintf(w.writer, "%s\n", sql)
+	}
+
+	return nil
+}
+
+// writeUniqueConstraints writes unique constraints as unique indexes
+func (w *Writer) writeUniqueConstraints(schema string, table *models.Table) error {
+	for _, constraint := range table.Constraints {
+		if constraint.Type != models.UniqueConstraint {
+			continue
+		}
+
+		data := ConstraintTemplateData{
+			Schema:  schema,
+			Table:   table.Name,
+			Name:    constraint.Name,
+			Columns: constraint.Columns,
+		}
+
+		sql, err := w.executor.ExecuteCreateUniqueConstraint(data)
+		if err != nil {
+			return fmt.Errorf("failed to execute create unique constraint template: %w", err)
+		}
+
+		fmt.Fprintf(w.writer, "%s\n", sql)
+	}
+
+	// Also handle unique indexes from the Indexes map
+	for _, index := range table.Indexes {
+		if !index.Unique {
+			continue
+		}
+
+		// Skip if already handled as a constraint
+		alreadyHandled := false
+		for _, constraint := range table.Constraints {
+			if constraint.Type == models.UniqueConstraint && constraint.Name == index.Name {
+				alreadyHandled = true
+				break
+			}
+		}
+		if alreadyHandled {
+			continue
+		}
+
+		data := ConstraintTemplateData{
+			Schema:  schema,
+			Table:   table.Name,
+			Name:    index.Name,
+			Columns: index.Columns,
+		}
+
+		sql, err := w.executor.ExecuteCreateUniqueConstraint(data)
+		if err != nil {
+			return fmt.Errorf("failed to execute create unique index template: %w", err)
+		}
+
+		fmt.Fprintf(w.writer, "%s\n", sql)
+	}
+
+	return nil
+}
+
+// writeCheckConstraints writes check constraints as comments
+func (w *Writer) writeCheckConstraints(schema string, table *models.Table) error {
+	for _, constraint := range table.Constraints {
+		if constraint.Type != models.CheckConstraint {
+			continue
+		}
+
+		data := ConstraintTemplateData{
+			Schema:     schema,
+			Table:      table.Name,
+			Name:       constraint.Name,
+			Expression: constraint.Expression,
+		}
+
+		sql, err := w.executor.ExecuteCreateCheckConstraint(data)
+		if err != nil {
+			return fmt.Errorf("failed to execute create check constraint template: %w", err)
+		}
+
+		fmt.Fprintf(w.writer, "%s\n", sql)
+	}
+
+	return nil
+}
+
+// writeForeignKeys writes foreign keys as comments
+func (w *Writer) writeForeignKeys(schema string, table *models.Table) error {
+	for _, constraint := range table.Constraints {
+		if constraint.Type != models.ForeignKeyConstraint {
+			continue
+		}
+
+		refSchema := constraint.ReferencedSchema
+		if refSchema == "" {
+			refSchema = schema
+		}
+
+		data := ConstraintTemplateData{
+			Schema:         schema,
+			Table:          table.Name,
+			Name:           constraint.Name,
+			Columns:        constraint.Columns,
+			ForeignSchema:  refSchema,
+			ForeignTable:   constraint.ReferencedTable,
+			ForeignColumns: constraint.ReferencedColumns,
+			OnDelete:       constraint.OnDelete,
+			OnUpdate:       constraint.OnUpdate,
+		}
+
+		sql, err := w.executor.ExecuteCreateForeignKey(data)
+		if err != nil {
+			return fmt.Errorf("failed to execute create foreign key template: %w", err)
+		}
+
+		fmt.Fprintf(w.writer, "%s\n", sql)
+	}
+
+	return nil
+}

pkg/writers/sqlite/writer_test.go

@@ -0,0 +1,418 @@
+package sqlite
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+func TestNewWriter(t *testing.T) {
+	opts := &writers.WriterOptions{
+		OutputPath:     "/tmp/test.sql",
+		FlattenSchema:  false, // Should be forced to true
+	}
+
+	writer := NewWriter(opts)
+
+	if !writer.options.FlattenSchema {
+		t.Error("Expected FlattenSchema to be forced to true for SQLite")
+	}
+}
+
+func TestWriteDatabase(t *testing.T) {
+	db := &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "users",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:         "id",
+								Type:         "serial",
+								NotNull:      true,
+								IsPrimaryKey: true,
+								Default:      "nextval('users_id_seq'::regclass)",
+							},
+							"email": {
+								Name:    "email",
+								Type:    "varchar(255)",
+								NotNull: true,
+							},
+							"active": {
+								Name:    "active",
+								Type:    "boolean",
+								NotNull: true,
+								Default: "true",
+							},
+						},
+						Constraints: map[string]*models.Constraint{
+							"pk_users": {
+								Name:    "pk_users",
+								Type:    models.PrimaryKeyConstraint,
+								Columns: []string{"id"},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+	writer.writer = &buf
+
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+
+	// Check for expected elements
+	if !strings.Contains(output, "PRAGMA foreign_keys = ON") {
+		t.Error("Expected PRAGMA foreign_keys statement")
+	}
+
+	if !strings.Contains(output, "CREATE TABLE") {
+		t.Error("Expected CREATE TABLE statement")
+	}
+
+	if !strings.Contains(output, "\"public_users\"") {
+		t.Error("Expected flattened table name public_users")
+	}
+
+	if !strings.Contains(output, "INTEGER PRIMARY KEY AUTOINCREMENT") {
+		t.Error("Expected autoincrement for serial primary key")
+	}
+
+	if !strings.Contains(output, "TEXT") {
+		t.Error("Expected TEXT type for varchar")
+	}
+
+	// Boolean should be mapped to INTEGER with default 1
+	if !strings.Contains(output, "active") {
+		t.Error("Expected active column")
+	}
+}
+
+func TestDataTypeMapping(t *testing.T) {
+	tests := []struct {
+		pgType   string
+		expected string
+	}{
+		{"varchar(255)", "TEXT"},
+		{"text", "TEXT"},
+		{"integer", "INTEGER"},
+		{"bigint", "INTEGER"},
+		{"serial", "INTEGER"},
+		{"boolean", "INTEGER"},
+		{"real", "REAL"},
+		{"double precision", "REAL"},
+		{"numeric(10,2)", "NUMERIC"},
+		{"decimal", "NUMERIC"},
+		{"bytea", "BLOB"},
+		{"timestamp", "TEXT"},
+		{"uuid", "TEXT"},
+		{"json", "TEXT"},
+		{"jsonb", "TEXT"},
+	}
+
+	for _, tt := range tests {
+		result := MapPostgreSQLType(tt.pgType)
+		if result != tt.expected {
+			t.Errorf("MapPostgreSQLType(%q) = %q, want %q", tt.pgType, result, tt.expected)
+		}
+	}
+}
+
+func TestIsAutoIncrementCandidate(t *testing.T) {
+	tests := []struct {
+		name     string
+		col      *models.Column
+		expected bool
+	}{
+		{
+			name: "serial primary key",
+			col: &models.Column{
+				Name:         "id",
+				Type:         "serial",
+				IsPrimaryKey: true,
+				Default:      "nextval('seq')",
+			},
+			expected: true,
+		},
+		{
+			name: "integer primary key with nextval",
+			col: &models.Column{
+				Name:         "id",
+				Type:         "integer",
+				IsPrimaryKey: true,
+				Default:      "nextval('users_id_seq'::regclass)",
+			},
+			expected: true,
+		},
+		{
+			name: "integer not primary key",
+			col: &models.Column{
+				Name:         "count",
+				Type:         "integer",
+				IsPrimaryKey: false,
+				Default:      "0",
+			},
+			expected: false,
+		},
+		{
+			name: "varchar primary key",
+			col: &models.Column{
+				Name:         "code",
+				Type:         "varchar",
+				IsPrimaryKey: true,
+			},
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := IsAutoIncrementCandidate(tt.col)
+			if result != tt.expected {
+				t.Errorf("IsAutoIncrementCandidate() = %v, want %v", result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestFormatDefault(t *testing.T) {
+	tests := []struct {
+		name     string
+		col      *models.Column
+		expected string
+	}{
+		{
+			name: "current_timestamp",
+			col: &models.Column{
+				Type:    "timestamp",
+				Default: "CURRENT_TIMESTAMP",
+			},
+			expected: "CURRENT_TIMESTAMP",
+		},
+		{
+			name: "now()",
+			col: &models.Column{
+				Type:    "timestamp",
+				Default: "now()",
+			},
+			expected: "CURRENT_TIMESTAMP",
+		},
+		{
+			name: "boolean true",
+			col: &models.Column{
+				Type:    "boolean",
+				Default: "true",
+			},
+			expected: "1",
+		},
+		{
+			name: "boolean false",
+			col: &models.Column{
+				Type:    "boolean",
+				Default: "false",
+			},
+			expected: "0",
+		},
+		{
+			name: "serial autoincrement",
+			col: &models.Column{
+				Type:         "serial",
+				IsPrimaryKey: true,
+				Default:      "nextval('seq')",
+			},
+			expected: "",
+		},
+		{
+			name: "uuid default removed",
+			col: &models.Column{
+				Type:    "uuid",
+				Default: "gen_random_uuid()",
+			},
+			expected: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := FormatDefault(tt.col)
+			if result != tt.expected {
+				t.Errorf("FormatDefault() = %q, want %q", result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestWriteSchema_MultiSchema(t *testing.T) {
+	db := &models.Database{
+		Name: "testdb",
+		Schemas: []*models.Schema{
+			{
+				Name: "auth",
+				Tables: []*models.Table{
+					{
+						Name: "sessions",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:         "id",
+								Type:         "uuid",
+								NotNull:      true,
+								IsPrimaryKey: true,
+							},
+						},
+						Constraints: map[string]*models.Constraint{
+							"pk_sessions": {
+								Name:    "pk_sessions",
+								Type:    models.PrimaryKeyConstraint,
+								Columns: []string{"id"},
+							},
+						},
+					},
+				},
+			},
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name: "posts",
+						Columns: map[string]*models.Column{
+							"id": {
+								Name:         "id",
+								Type:         "integer",
+								NotNull:      true,
+								IsPrimaryKey: true,
+							},
+						},
+						Constraints: map[string]*models.Constraint{
+							"pk_posts": {
+								Name:    "pk_posts",
+								Type:    models.PrimaryKeyConstraint,
+								Columns: []string{"id"},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+	writer.writer = &buf
+
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+
+	// Check for flattened table names from both schemas
+	if !strings.Contains(output, "\"auth_sessions\"") {
+		t.Error("Expected flattened table name auth_sessions")
+	}
+
+	if !strings.Contains(output, "\"public_posts\"") {
+		t.Error("Expected flattened table name public_posts")
+	}
+}
+
+func TestWriteIndexes(t *testing.T) {
+	table := &models.Table{
+		Name: "users",
+		Columns: map[string]*models.Column{
+			"email": {
+				Name: "email",
+				Type: "varchar(255)",
+			},
+		},
+		Indexes: map[string]*models.Index{
+			"idx_users_email": {
+				Name:    "idx_users_email",
+				Columns: []string{"email"},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+	writer.writer = &buf
+
+	err := writer.writeIndexes("public", table)
+	if err != nil {
+		t.Fatalf("writeIndexes failed: %v", err)
+	}
+
+	output := buf.String()
+
+	if !strings.Contains(output, "CREATE INDEX") {
+		t.Error("Expected CREATE INDEX statement")
+	}
+
+	if !strings.Contains(output, "public_users_idx_users_email") {
+		t.Errorf("Expected flattened index name public_users_idx_users_email, got output:\n%s", output)
+	}
+}
+
+func TestWriteUniqueConstraints(t *testing.T) {
+	table := &models.Table{
+		Name: "users",
+		Constraints: map[string]*models.Constraint{
+			"uk_users_email": {
+				Name:    "uk_users_email",
+				Type:    models.UniqueConstraint,
+				Columns: []string{"email"},
+			},
+		},
+	}
+
+	var buf bytes.Buffer
+	opts := &writers.WriterOptions{}
+	writer := NewWriter(opts)
+	writer.writer = &buf
+
+	err := writer.writeUniqueConstraints("public", table)
+	if err != nil {
+		t.Fatalf("writeUniqueConstraints failed: %v", err)
+	}
+
+	output := buf.String()
+
+	if !strings.Contains(output, "CREATE UNIQUE INDEX") {
+		t.Error("Expected CREATE UNIQUE INDEX statement")
+	}
+}
+
+func TestQuoteIdentifier(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"users", `"users"`},
+		{"public_users", `"public_users"`},
+		{`user"name`, `"user""name"`}, // Double quotes should be escaped
+	}
+
+	for _, tt := range tests {
+		result := QuoteIdentifier(tt.input)
+		if result != tt.expected {
+			t.Errorf("QuoteIdentifier(%q) = %q, want %q", tt.input, result, tt.expected)
+		}
+	}
+}

test_data/mssql/TESTING.md

@@ -0,0 +1,286 @@
+# MSSQL Reader and Writer Testing Guide
+
+## Prerequisites
+
+- Docker and Docker Compose installed
+- RelSpec binary built (`make build`)
+- jq (optional, for JSON processing)
+
+## Quick Start
+
+### 1. Start SQL Server Express
+
+```bash
+docker-compose up -d mssql
+
+# Wait for container to be healthy
+docker-compose ps
+
+# Monitor startup logs
+docker-compose logs -f mssql
+```
+
+### 2. Verify Database Creation
+
+```bash
+docker exec -it $(docker-compose ps -q mssql) \
+  /opt/mssql-tools/bin/sqlcmd \
+  -S localhost \
+  -U sa \
+  -P 'StrongPassword123!' \
+  -Q "SELECT name FROM sys.databases WHERE name = 'RelSpecTest'"
+```
+
+## Testing Scenarios
+
+### Scenario 1: Read MSSQL Database to JSON
+
+Read the test schema from MSSQL and export to JSON:
+
+```bash
+./build/relspec convert \
+  --from mssql \
+  --from-conn "sqlserver://sa:StrongPassword123!@localhost:1433/RelSpecTest" \
+  --to json \
+  --to-path test_output.json
+```
+
+Verify output:
+```bash
+jq '.Schemas[0].Tables | length' test_output.json
+jq '.Schemas[0].Tables[0]' test_output.json
+```
+
+### Scenario 2: Read MSSQL Database to DBML
+
+Convert MSSQL schema to DBML format:
+
+```bash
+./build/relspec convert \
+  --from mssql \
+  --from-conn "sqlserver://sa:StrongPassword123!@localhost:1433/RelSpecTest" \
+  --to dbml \
+  --to-path test_output.dbml
+```
+
+### Scenario 3: Generate SQL Script (No Direct Execution)
+
+Generate SQL script without executing:
+
+```bash
+./build/relspec convert \
+  --from mssql \
+  --from-conn "sqlserver://sa:StrongPassword123!@localhost:1433/RelSpecTest" \
+  --to mssql \
+  --to-path test_output.sql
+```
+
+Inspect generated SQL:
+```bash
+head -50 test_output.sql
+```
+
+### Scenario 4: Round-Trip Conversion (MSSQL → JSON → MSSQL)
+
+Test bidirectional conversion:
+
+```bash
+# Step 1: MSSQL → JSON
+./build/relspec convert \
+  --from mssql \
+  --from-conn "sqlserver://sa:StrongPassword123!@localhost:1433/RelSpecTest" \
+  --to json \
+  --to-path backup.json
+
+# Step 2: JSON → MSSQL SQL
+./build/relspec convert \
+  --from json \
+  --from-path backup.json \
+  --to mssql \
+  --to-path restore.sql
+
+# Inspect SQL
+cat restore.sql | head -50
+```
+
+### Scenario 5: Cross-Database Conversion
+
+If you have PostgreSQL running, test conversion:
+
+```bash
+# MSSQL → PostgreSQL SQL
+./build/relspec convert \
+  --from mssql \
+  --from-conn "sqlserver://sa:StrongPassword123!@localhost:1433/RelSpecTest" \
+  --to pgsql \
+  --to-path mssql_to_pg.sql
+```
+
+### Scenario 6: Test Type Mappings
+
+Create a JSON file with various types and convert to MSSQL:
+
+```json
+{
+  "Name": "TypeTest",
+  "Schemas": [
+    {
+      "Name": "dbo",
+      "Tables": [
+        {
+          "Name": "type_samples",
+          "Columns": {
+            "id": {
+              "Name": "id",
+              "Type": "int",
+              "AutoIncrement": true,
+              "NotNull": true,
+              "Sequence": 1
+            },
+            "big_num": {
+              "Name": "big_num",
+              "Type": "int64",
+              "Sequence": 2
+            },
+            "is_active": {
+              "Name": "is_active",
+              "Type": "bool",
+              "Sequence": 3
+            },
+            "description": {
+              "Name": "description",
+              "Type": "text",
+              "Sequence": 4
+            },
+            "created_at": {
+              "Name": "created_at",
+              "Type": "timestamp",
+              "NotNull": true,
+              "Default": "GETDATE()",
+              "Sequence": 5
+            },
+            "unique_id": {
+              "Name": "unique_id",
+              "Type": "uuid",
+              "Sequence": 6
+            },
+            "metadata": {
+              "Name": "metadata",
+              "Type": "json",
+              "Sequence": 7
+            },
+            "binary_data": {
+              "Name": "binary_data",
+              "Type": "bytea",
+              "Sequence": 8
+            }
+          },
+          "Constraints": {
+            "PK_type_samples_id": {
+              "Name": "PK_type_samples_id",
+              "Type": "PRIMARY_KEY",
+              "Columns": ["id"]
+            }
+          }
+        }
+      ]
+    }
+  ]
+}
+```
+
+Convert to MSSQL:
+```bash
+./build/relspec convert \
+  --from json \
+  --from-path type_test.json \
+  --to mssql \
+  --to-path type_test.sql
+
+cat type_test.sql
+```
+
+## Cleanup
+
+Stop and remove the SQL Server container:
+
+```bash
+docker-compose down
+
+# Clean up test files
+rm -f test_output.* backup.json restore.sql
+```
+
+## Troubleshooting
+
+### Container won't start
+
+Check Docker daemon is running and database logs:
+```bash
+docker-compose logs mssql
+```
+
+### Connection refused errors
+
+Wait for container to be healthy:
+```bash
+docker-compose ps
+# Wait until STATUS shows "healthy"
+
+# Or check manually
+docker exec -it $(docker-compose ps -q mssql) \
+  /opt/mssql-tools/bin/sqlcmd \
+  -S localhost \
+  -U sa \
+  -P 'StrongPassword123!' \
+  -Q "SELECT @@VERSION"
+```
+
+### Test schema not found
+
+Initialize the test schema:
+```bash
+docker exec -i $(docker-compose ps -q mssql) \
+  /opt/mssql-tools/bin/sqlcmd \
+  -S localhost \
+  -U sa \
+  -P 'StrongPassword123!' \
+  < test_data/mssql/test_schema.sql
+```
+
+### Connection string format issues
+
+Use the correct format for connection strings:
+- Default port: 1433
+- Username: `sa`
+- Password: `StrongPassword123!`
+- Database: `RelSpecTest`
+
+Format: `sqlserver://sa:StrongPassword123!@localhost:1433/RelSpecTest`
+
+## Performance Notes
+
+- Initial reader setup may take a few seconds
+- Type mapping queries are cached within a single read operation
+- Direct execution mode is atomic per table/constraint
+- Large schemas (100+ tables) should complete in under 5 seconds
+
+## Unit Test Verification
+
+Run the MSSQL-specific tests:
+
+```bash
+# Type mapping tests
+go test ./pkg/mssql/... -v
+
+# Reader tests
+go test ./pkg/readers/mssql/... -v
+
+# Writer tests
+go test ./pkg/writers/mssql/... -v
+
+# All together
+go test ./pkg/mssql/... ./pkg/readers/mssql/... ./pkg/writers/mssql/... -v
+```
+
+Expected output: All tests should PASS

test_data/mssql/test_schema.sql

@@ -0,0 +1,187 @@
+-- Test schema for MSSQL Reader integration tests
+-- This script creates a sample database for testing the MSSQL reader
+
+USE master;
+GO
+
+-- Drop existing database if it exists
+IF EXISTS (SELECT 1 FROM sys.databases WHERE name = 'RelSpecTest')
+BEGIN
+    ALTER DATABASE RelSpecTest SET SINGLE_USER WITH ROLLBACK IMMEDIATE;
+    DROP DATABASE RelSpecTest;
+END
+GO
+
+-- Create test database
+CREATE DATABASE RelSpecTest;
+GO
+
+USE RelSpecTest;
+GO
+
+-- Create schemas
+CREATE SCHEMA [public];
+GO
+
+CREATE SCHEMA [auth];
+GO
+
+-- Create tables in public schema
+CREATE TABLE [public].[users] (
+    [id] INT IDENTITY(1,1) NOT NULL,
+    [email] NVARCHAR(255) NOT NULL,
+    [username] NVARCHAR(100) NOT NULL,
+    [created_at] DATETIME2 NOT NULL DEFAULT GETDATE(),
+    [updated_at] DATETIME2 NULL,
+    [is_active] BIT NOT NULL DEFAULT 1,
+    PRIMARY KEY ([id]),
+    UNIQUE ([email]),
+    UNIQUE ([username])
+);
+GO
+
+CREATE TABLE [public].[posts] (
+    [id] INT IDENTITY(1,1) NOT NULL,
+    [user_id] INT NOT NULL,
+    [title] NVARCHAR(255) NOT NULL,
+    [content] NVARCHAR(MAX) NOT NULL,
+    [published_at] DATETIME2 NULL,
+    [created_at] DATETIME2 NOT NULL DEFAULT GETDATE(),
+    PRIMARY KEY ([id])
+);
+GO
+
+CREATE TABLE [public].[comments] (
+    [id] INT IDENTITY(1,1) NOT NULL,
+    [post_id] INT NOT NULL,
+    [user_id] INT NOT NULL,
+    [content] NVARCHAR(MAX) NOT NULL,
+    [created_at] DATETIME2 NOT NULL DEFAULT GETDATE(),
+    PRIMARY KEY ([id])
+);
+GO
+
+-- Create tables in auth schema
+CREATE TABLE [auth].[roles] (
+    [id] INT IDENTITY(1,1) NOT NULL,
+    [name] NVARCHAR(100) NOT NULL,
+    [description] NVARCHAR(MAX) NULL,
+    PRIMARY KEY ([id]),
+    UNIQUE ([name])
+);
+GO
+
+CREATE TABLE [auth].[user_roles] (
+    [id] INT IDENTITY(1,1) NOT NULL,
+    [user_id] INT NOT NULL,
+    [role_id] INT NOT NULL,
+    PRIMARY KEY ([id]),
+    UNIQUE ([user_id], [role_id])
+);
+GO
+
+-- Add foreign keys
+ALTER TABLE [public].[posts]
+ADD CONSTRAINT [FK_posts_users]
+FOREIGN KEY ([user_id])
+REFERENCES [public].[users] ([id])
+ON DELETE CASCADE ON UPDATE NO ACTION;
+GO
+
+ALTER TABLE [public].[comments]
+ADD CONSTRAINT [FK_comments_posts]
+FOREIGN KEY ([post_id])
+REFERENCES [public].[posts] ([id])
+ON DELETE CASCADE ON UPDATE NO ACTION;
+GO
+
+ALTER TABLE [public].[comments]
+ADD CONSTRAINT [FK_comments_users]
+FOREIGN KEY ([user_id])
+REFERENCES [public].[users] ([id])
+ON DELETE CASCADE ON UPDATE NO ACTION;
+GO
+
+ALTER TABLE [auth].[user_roles]
+ADD CONSTRAINT [FK_user_roles_users]
+FOREIGN KEY ([user_id])
+REFERENCES [public].[users] ([id])
+ON DELETE CASCADE ON UPDATE NO ACTION;
+GO
+
+ALTER TABLE [auth].[user_roles]
+ADD CONSTRAINT [FK_user_roles_roles]
+FOREIGN KEY ([role_id])
+REFERENCES [auth].[roles] ([id])
+ON DELETE CASCADE ON UPDATE NO ACTION;
+GO
+
+-- Create indexes
+CREATE INDEX [IDX_users_email] ON [public].[users] ([email]);
+GO
+
+CREATE INDEX [IDX_posts_user_id] ON [public].[posts] ([user_id]);
+GO
+
+CREATE INDEX [IDX_comments_post_id] ON [public].[comments] ([post_id]);
+GO
+
+CREATE INDEX [IDX_comments_user_id] ON [public].[comments] ([user_id]);
+GO
+
+-- Add extended properties (comments)
+EXEC sp_addextendedproperty
+  @name = 'MS_Description',
+  @value = 'User accounts table',
+  @level0type = 'SCHEMA', @level0name = 'public',
+  @level1type = 'TABLE', @level1name = 'users';
+GO
+
+EXEC sp_addextendedproperty
+  @name = 'MS_Description',
+  @value = 'User unique identifier',
+  @level0type = 'SCHEMA', @level0name = 'public',
+  @level1type = 'TABLE', @level1name = 'users',
+  @level2type = 'COLUMN', @level2name = 'id';
+GO
+
+EXEC sp_addextendedproperty
+  @name = 'MS_Description',
+  @value = 'User email address',
+  @level0type = 'SCHEMA', @level0name = 'public',
+  @level1type = 'TABLE', @level1name = 'users',
+  @level2type = 'COLUMN', @level2name = 'email';
+GO
+
+EXEC sp_addextendedproperty
+  @name = 'MS_Description',
+  @value = 'Blog posts table',
+  @level0type = 'SCHEMA', @level0name = 'public',
+  @level1type = 'TABLE', @level1name = 'posts';
+GO
+
+EXEC sp_addextendedproperty
+  @name = 'MS_Description',
+  @value = 'User roles mapping table',
+  @level0type = 'SCHEMA', @level0name = 'auth',
+  @level1type = 'TABLE', @level1name = 'user_roles';
+GO
+
+-- Add check constraint
+ALTER TABLE [public].[users]
+ADD CONSTRAINT [CK_users_email_format]
+CHECK (LEN(email) > 0 AND email LIKE '%@%.%');
+GO
+
+-- Verify schema was created
+SELECT
+    SCHEMA_NAME(s.schema_id) as [Schema],
+    t.name as [Table],
+    COUNT(c.column_id) as [ColumnCount]
+FROM sys.tables t
+INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
+LEFT JOIN sys.columns c ON t.object_id = c.object_id
+WHERE SCHEMA_NAME(s.schema_id) IN ('public', 'auth')
+GROUP BY SCHEMA_NAME(s.schema_id), t.name
+ORDER BY [Schema], [Table];
+GO

vendor/github.com/dustin/go-humanize/.travis.yml

@@ -0,0 +1,21 @@
+sudo: false
+language: go
+go_import_path: github.com/dustin/go-humanize
+go:
+  - 1.13.x
+  - 1.14.x
+  - 1.15.x
+  - 1.16.x
+  - stable
+  - master
+matrix:
+  allow_failures:
+    - go: master
+  fast_finish: true
+install:
+  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
+script:
+  - diff -u <(echo -n) <(gofmt -d -s .)
+  - go vet .
+  - go install -v -race ./...
+  - go test -v -race ./...

vendor/github.com/dustin/go-humanize/LICENSE

@@ -0,0 +1,21 @@
+Copyright (c) 2005-2008  Dustin Sallings <dustin@spy.net>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+<http://www.opensource.org/licenses/mit-license.php>

vendor/github.com/dustin/go-humanize/README.markdown

@@ -0,0 +1,124 @@
+# Humane Units [![Build Status](https://travis-ci.org/dustin/go-humanize.svg?branch=master)](https://travis-ci.org/dustin/go-humanize) [![GoDoc](https://godoc.org/github.com/dustin/go-humanize?status.svg)](https://godoc.org/github.com/dustin/go-humanize)
+
+Just a few functions for helping humanize times and sizes.
+
+`go get` it as `github.com/dustin/go-humanize`, import it as
+`"github.com/dustin/go-humanize"`, use it as `humanize`.
+
+See [godoc](https://pkg.go.dev/github.com/dustin/go-humanize) for
+complete documentation.
+
+## Sizes
+
+This lets you take numbers like `82854982` and convert them to useful
+strings like, `83 MB` or `79 MiB` (whichever you prefer).
+
+Example:
+
+```go
+fmt.Printf("That file is %s.", humanize.Bytes(82854982)) // That file is 83 MB.
+```
+
+## Times
+
+This lets you take a `time.Time` and spit it out in relative terms.
+For example, `12 seconds ago` or `3 days from now`.
+
+Example:
+
+```go
+fmt.Printf("This was touched %s.", humanize.Time(someTimeInstance)) // This was touched 7 hours ago.
+```
+
+Thanks to Kyle Lemons for the time implementation from an IRC
+conversation one day. It's pretty neat.
+
+## Ordinals
+
+From a [mailing list discussion][odisc] where a user wanted to be able
+to label ordinals.
+
+    0 -> 0th
+    1 -> 1st
+    2 -> 2nd
+    3 -> 3rd
+    4 -> 4th
+    [...]
+
+Example:
+
+```go
+fmt.Printf("You're my %s best friend.", humanize.Ordinal(193)) // You are my 193rd best friend.
+```
+
+## Commas
+
+Want to shove commas into numbers? Be my guest.
+
+    0 -> 0
+    100 -> 100
+    1000 -> 1,000
+    1000000000 -> 1,000,000,000
+    -100000 -> -100,000
+
+Example:
+
+```go
+fmt.Printf("You owe $%s.\n", humanize.Comma(6582491)) // You owe $6,582,491.
+```
+
+## Ftoa
+
+Nicer float64 formatter that removes trailing zeros.
+
+```go
+fmt.Printf("%f", 2.24)                // 2.240000
+fmt.Printf("%s", humanize.Ftoa(2.24)) // 2.24
+fmt.Printf("%f", 2.0)                 // 2.000000
+fmt.Printf("%s", humanize.Ftoa(2.0))  // 2
+```
+
+## SI notation
+
+Format numbers with [SI notation][sinotation].
+
+Example:
+
+```go
+humanize.SI(0.00000000223, "M") // 2.23 nM
+```
+
+## English-specific functions
+
+The following functions are in the `humanize/english` subpackage.
+
+### Plurals
+
+Simple English pluralization
+
+```go
+english.PluralWord(1, "object", "") // object
+english.PluralWord(42, "object", "") // objects
+english.PluralWord(2, "bus", "") // buses
+english.PluralWord(99, "locus", "loci") // loci
+
+english.Plural(1, "object", "") // 1 object
+english.Plural(42, "object", "") // 42 objects
+english.Plural(2, "bus", "") // 2 buses
+english.Plural(99, "locus", "loci") // 99 loci
+```
+
+### Word series
+
+Format comma-separated words lists with conjuctions:
+
+```go
+english.WordSeries([]string{"foo"}, "and") // foo
+english.WordSeries([]string{"foo", "bar"}, "and") // foo and bar
+english.WordSeries([]string{"foo", "bar", "baz"}, "and") // foo, bar and baz
+
+english.OxfordWordSeries([]string{"foo", "bar", "baz"}, "and") // foo, bar, and baz
+```
+
+[odisc]: https://groups.google.com/d/topic/golang-nuts/l8NhI74jl-4/discussion
+[sinotation]: http://en.wikipedia.org/wiki/Metric_prefix

vendor/github.com/dustin/go-humanize/big.go

@@ -0,0 +1,31 @@
+package humanize
+
+import (
+	"math/big"
+)
+
+// order of magnitude (to a max order)
+func oomm(n, b *big.Int, maxmag int) (float64, int) {
+	mag := 0
+	m := &big.Int{}
+	for n.Cmp(b) >= 0 {
+		n.DivMod(n, b, m)
+		mag++
+		if mag == maxmag && maxmag >= 0 {
+			break
+		}
+	}
+	return float64(n.Int64()) + (float64(m.Int64()) / float64(b.Int64())), mag
+}
+
+// total order of magnitude
+// (same as above, but with no upper limit)
+func oom(n, b *big.Int) (float64, int) {
+	mag := 0
+	m := &big.Int{}
+	for n.Cmp(b) >= 0 {
+		n.DivMod(n, b, m)
+		mag++
+	}
+	return float64(n.Int64()) + (float64(m.Int64()) / float64(b.Int64())), mag
+}

vendor/github.com/dustin/go-humanize/bigbytes.go

@@ -0,0 +1,189 @@
+package humanize
+
+import (
+	"fmt"
+	"math/big"
+	"strings"
+	"unicode"
+)
+
+var (
+	bigIECExp = big.NewInt(1024)
+
+	// BigByte is one byte in bit.Ints
+	BigByte = big.NewInt(1)
+	// BigKiByte is 1,024 bytes in bit.Ints
+	BigKiByte = (&big.Int{}).Mul(BigByte, bigIECExp)
+	// BigMiByte is 1,024 k bytes in bit.Ints
+	BigMiByte = (&big.Int{}).Mul(BigKiByte, bigIECExp)
+	// BigGiByte is 1,024 m bytes in bit.Ints
+	BigGiByte = (&big.Int{}).Mul(BigMiByte, bigIECExp)
+	// BigTiByte is 1,024 g bytes in bit.Ints
+	BigTiByte = (&big.Int{}).Mul(BigGiByte, bigIECExp)
+	// BigPiByte is 1,024 t bytes in bit.Ints
+	BigPiByte = (&big.Int{}).Mul(BigTiByte, bigIECExp)
+	// BigEiByte is 1,024 p bytes in bit.Ints
+	BigEiByte = (&big.Int{}).Mul(BigPiByte, bigIECExp)
+	// BigZiByte is 1,024 e bytes in bit.Ints
+	BigZiByte = (&big.Int{}).Mul(BigEiByte, bigIECExp)
+	// BigYiByte is 1,024 z bytes in bit.Ints
+	BigYiByte = (&big.Int{}).Mul(BigZiByte, bigIECExp)
+	// BigRiByte is 1,024 y bytes in bit.Ints
+	BigRiByte = (&big.Int{}).Mul(BigYiByte, bigIECExp)
+	// BigQiByte is 1,024 r bytes in bit.Ints
+	BigQiByte = (&big.Int{}).Mul(BigRiByte, bigIECExp)
+)
+
+var (
+	bigSIExp = big.NewInt(1000)
+
+	// BigSIByte is one SI byte in big.Ints
+	BigSIByte = big.NewInt(1)
+	// BigKByte is 1,000 SI bytes in big.Ints
+	BigKByte = (&big.Int{}).Mul(BigSIByte, bigSIExp)
+	// BigMByte is 1,000 SI k bytes in big.Ints
+	BigMByte = (&big.Int{}).Mul(BigKByte, bigSIExp)
+	// BigGByte is 1,000 SI m bytes in big.Ints
+	BigGByte = (&big.Int{}).Mul(BigMByte, bigSIExp)
+	// BigTByte is 1,000 SI g bytes in big.Ints
+	BigTByte = (&big.Int{}).Mul(BigGByte, bigSIExp)
+	// BigPByte is 1,000 SI t bytes in big.Ints
+	BigPByte = (&big.Int{}).Mul(BigTByte, bigSIExp)
+	// BigEByte is 1,000 SI p bytes in big.Ints
+	BigEByte = (&big.Int{}).Mul(BigPByte, bigSIExp)
+	// BigZByte is 1,000 SI e bytes in big.Ints
+	BigZByte = (&big.Int{}).Mul(BigEByte, bigSIExp)
+	// BigYByte is 1,000 SI z bytes in big.Ints
+	BigYByte = (&big.Int{}).Mul(BigZByte, bigSIExp)
+	// BigRByte is 1,000 SI y bytes in big.Ints
+	BigRByte = (&big.Int{}).Mul(BigYByte, bigSIExp)
+	// BigQByte is 1,000 SI r bytes in big.Ints
+	BigQByte = (&big.Int{}).Mul(BigRByte, bigSIExp)
+)
+
+var bigBytesSizeTable = map[string]*big.Int{
+	"b":   BigByte,
+	"kib": BigKiByte,
+	"kb":  BigKByte,
+	"mib": BigMiByte,
+	"mb":  BigMByte,
+	"gib": BigGiByte,
+	"gb":  BigGByte,
+	"tib": BigTiByte,
+	"tb":  BigTByte,
+	"pib": BigPiByte,
+	"pb":  BigPByte,
+	"eib": BigEiByte,
+	"eb":  BigEByte,
+	"zib": BigZiByte,
+	"zb":  BigZByte,
+	"yib": BigYiByte,
+	"yb":  BigYByte,
+	"rib": BigRiByte,
+	"rb":  BigRByte,
+	"qib": BigQiByte,
+	"qb":  BigQByte,
+	// Without suffix
+	"":   BigByte,
+	"ki": BigKiByte,
+	"k":  BigKByte,
+	"mi": BigMiByte,
+	"m":  BigMByte,
+	"gi": BigGiByte,
+	"g":  BigGByte,
+	"ti": BigTiByte,
+	"t":  BigTByte,
+	"pi": BigPiByte,
+	"p":  BigPByte,
+	"ei": BigEiByte,
+	"e":  BigEByte,
+	"z":  BigZByte,
+	"zi": BigZiByte,
+	"y":  BigYByte,
+	"yi": BigYiByte,
+	"r":  BigRByte,
+	"ri": BigRiByte,
+	"q":  BigQByte,
+	"qi": BigQiByte,
+}
+
+var ten = big.NewInt(10)
+
+func humanateBigBytes(s, base *big.Int, sizes []string) string {
+	if s.Cmp(ten) < 0 {
+		return fmt.Sprintf("%d B", s)
+	}
+	c := (&big.Int{}).Set(s)
+	val, mag := oomm(c, base, len(sizes)-1)
+	suffix := sizes[mag]
+	f := "%.0f %s"
+	if val < 10 {
+		f = "%.1f %s"
+	}
+
+	return fmt.Sprintf(f, val, suffix)
+
+}
+
+// BigBytes produces a human readable representation of an SI size.
+//
+// See also: ParseBigBytes.
+//
+// BigBytes(82854982) -> 83 MB
+func BigBytes(s *big.Int) string {
+	sizes := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", "RB", "QB"}
+	return humanateBigBytes(s, bigSIExp, sizes)
+}
+
+// BigIBytes produces a human readable representation of an IEC size.
+//
+// See also: ParseBigBytes.
+//
+// BigIBytes(82854982) -> 79 MiB
+func BigIBytes(s *big.Int) string {
+	sizes := []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB", "RiB", "QiB"}
+	return humanateBigBytes(s, bigIECExp, sizes)
+}
+
+// ParseBigBytes parses a string representation of bytes into the number
+// of bytes it represents.
+//
+// See also: BigBytes, BigIBytes.
+//
+// ParseBigBytes("42 MB") -> 42000000, nil
+// ParseBigBytes("42 mib") -> 44040192, nil
+func ParseBigBytes(s string) (*big.Int, error) {
+	lastDigit := 0
+	hasComma := false
+	for _, r := range s {
+		if !(unicode.IsDigit(r) || r == '.' || r == ',') {
+			break
+		}
+		if r == ',' {
+			hasComma = true
+		}
+		lastDigit++
+	}
+
+	num := s[:lastDigit]
+	if hasComma {
+		num = strings.Replace(num, ",", "", -1)
+	}
+
+	val := &big.Rat{}
+	_, err := fmt.Sscanf(num, "%f", val)
+	if err != nil {
+		return nil, err
+	}
+
+	extra := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
+	if m, ok := bigBytesSizeTable[extra]; ok {
+		mv := (&big.Rat{}).SetInt(m)
+		val.Mul(val, mv)
+		rv := &big.Int{}
+		rv.Div(val.Num(), val.Denom())
+		return rv, nil
+	}
+
+	return nil, fmt.Errorf("unhandled size name: %v", extra)
+}

vendor/github.com/dustin/go-humanize/bytes.go

@@ -0,0 +1,143 @@
+package humanize
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"unicode"
+)
+
+// IEC Sizes.
+// kibis of bits
+const (
+	Byte = 1 << (iota * 10)
+	KiByte
+	MiByte
+	GiByte
+	TiByte
+	PiByte
+	EiByte
+)
+
+// SI Sizes.
+const (
+	IByte = 1
+	KByte = IByte * 1000
+	MByte = KByte * 1000
+	GByte = MByte * 1000
+	TByte = GByte * 1000
+	PByte = TByte * 1000
+	EByte = PByte * 1000
+)
+
+var bytesSizeTable = map[string]uint64{
+	"b":   Byte,
+	"kib": KiByte,
+	"kb":  KByte,
+	"mib": MiByte,
+	"mb":  MByte,
+	"gib": GiByte,
+	"gb":  GByte,
+	"tib": TiByte,
+	"tb":  TByte,
+	"pib": PiByte,
+	"pb":  PByte,
+	"eib": EiByte,
+	"eb":  EByte,
+	// Without suffix
+	"":   Byte,
+	"ki": KiByte,
+	"k":  KByte,
+	"mi": MiByte,
+	"m":  MByte,
+	"gi": GiByte,
+	"g":  GByte,
+	"ti": TiByte,
+	"t":  TByte,
+	"pi": PiByte,
+	"p":  PByte,
+	"ei": EiByte,
+	"e":  EByte,
+}
+
+func logn(n, b float64) float64 {
+	return math.Log(n) / math.Log(b)
+}
+
+func humanateBytes(s uint64, base float64, sizes []string) string {
+	if s < 10 {
+		return fmt.Sprintf("%d B", s)
+	}
+	e := math.Floor(logn(float64(s), base))
+	suffix := sizes[int(e)]
+	val := math.Floor(float64(s)/math.Pow(base, e)*10+0.5) / 10
+	f := "%.0f %s"
+	if val < 10 {
+		f = "%.1f %s"
+	}
+
+	return fmt.Sprintf(f, val, suffix)
+}
+
+// Bytes produces a human readable representation of an SI size.
+//
+// See also: ParseBytes.
+//
+// Bytes(82854982) -> 83 MB
+func Bytes(s uint64) string {
+	sizes := []string{"B", "kB", "MB", "GB", "TB", "PB", "EB"}
+	return humanateBytes(s, 1000, sizes)
+}
+
+// IBytes produces a human readable representation of an IEC size.
+//
+// See also: ParseBytes.
+//
+// IBytes(82854982) -> 79 MiB
+func IBytes(s uint64) string {
+	sizes := []string{"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"}
+	return humanateBytes(s, 1024, sizes)
+}
+
+// ParseBytes parses a string representation of bytes into the number
+// of bytes it represents.
+//
+// See Also: Bytes, IBytes.
+//
+// ParseBytes("42 MB") -> 42000000, nil
+// ParseBytes("42 mib") -> 44040192, nil
+func ParseBytes(s string) (uint64, error) {
+	lastDigit := 0
+	hasComma := false
+	for _, r := range s {
+		if !(unicode.IsDigit(r) || r == '.' || r == ',') {
+			break
+		}
+		if r == ',' {
+			hasComma = true
+		}
+		lastDigit++
+	}
+
+	num := s[:lastDigit]
+	if hasComma {
+		num = strings.Replace(num, ",", "", -1)
+	}
+
+	f, err := strconv.ParseFloat(num, 64)
+	if err != nil {
+		return 0, err
+	}
+
+	extra := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
+	if m, ok := bytesSizeTable[extra]; ok {
+		f *= float64(m)
+		if f >= math.MaxUint64 {
+			return 0, fmt.Errorf("too large: %v", s)
+		}
+		return uint64(f), nil
+	}
+
+	return 0, fmt.Errorf("unhandled size name: %v", extra)
+}

vendor/github.com/dustin/go-humanize/comma.go

@@ -0,0 +1,116 @@
+package humanize
+
+import (
+	"bytes"
+	"math"
+	"math/big"
+	"strconv"
+	"strings"
+)
+
+// Comma produces a string form of the given number in base 10 with
+// commas after every three orders of magnitude.
+//
+// e.g. Comma(834142) -> 834,142
+func Comma(v int64) string {
+	sign := ""
+
+	// Min int64 can't be negated to a usable value, so it has to be special cased.
+	if v == math.MinInt64 {
+		return "-9,223,372,036,854,775,808"
+	}
+
+	if v < 0 {
+		sign = "-"
+		v = 0 - v
+	}
+
+	parts := []string{"", "", "", "", "", "", ""}
+	j := len(parts) - 1
+
+	for v > 999 {
+		parts[j] = strconv.FormatInt(v%1000, 10)
+		switch len(parts[j]) {
+		case 2:
+			parts[j] = "0" + parts[j]
+		case 1:
+			parts[j] = "00" + parts[j]
+		}
+		v = v / 1000
+		j--
+	}
+	parts[j] = strconv.Itoa(int(v))
+	return sign + strings.Join(parts[j:], ",")
+}
+
+// Commaf produces a string form of the given number in base 10 with
+// commas after every three orders of magnitude.
+//
+// e.g. Commaf(834142.32) -> 834,142.32
+func Commaf(v float64) string {
+	buf := &bytes.Buffer{}
+	if v < 0 {
+		buf.Write([]byte{'-'})
+		v = 0 - v
+	}
+
+	comma := []byte{','}
+
+	parts := strings.Split(strconv.FormatFloat(v, 'f', -1, 64), ".")
+	pos := 0
+	if len(parts[0])%3 != 0 {
+		pos += len(parts[0]) % 3
+		buf.WriteString(parts[0][:pos])
+		buf.Write(comma)
+	}
+	for ; pos < len(parts[0]); pos += 3 {
+		buf.WriteString(parts[0][pos : pos+3])
+		buf.Write(comma)
+	}
+	buf.Truncate(buf.Len() - 1)
+
+	if len(parts) > 1 {
+		buf.Write([]byte{'.'})
+		buf.WriteString(parts[1])
+	}
+	return buf.String()
+}
+
+// CommafWithDigits works like the Commaf but limits the resulting
+// string to the given number of decimal places.
+//
+// e.g. CommafWithDigits(834142.32, 1) -> 834,142.3
+func CommafWithDigits(f float64, decimals int) string {
+	return stripTrailingDigits(Commaf(f), decimals)
+}
+
+// BigComma produces a string form of the given big.Int in base 10
+// with commas after every three orders of magnitude.
+func BigComma(b *big.Int) string {
+	sign := ""
+	if b.Sign() < 0 {
+		sign = "-"
+		b.Abs(b)
+	}
+
+	athousand := big.NewInt(1000)
+	c := (&big.Int{}).Set(b)
+	_, m := oom(c, athousand)
+	parts := make([]string, m+1)
+	j := len(parts) - 1
+
+	mod := &big.Int{}
+	for b.Cmp(athousand) >= 0 {
+		b.DivMod(b, athousand, mod)
+		parts[j] = strconv.FormatInt(mod.Int64(), 10)
+		switch len(parts[j]) {
+		case 2:
+			parts[j] = "0" + parts[j]
+		case 1:
+			parts[j] = "00" + parts[j]
+		}
+		j--
+	}
+	parts[j] = strconv.Itoa(int(b.Int64()))
+	return sign + strings.Join(parts[j:], ",")
+}

vendor/github.com/dustin/go-humanize/commaf.go

@@ -0,0 +1,41 @@
+//go:build go1.6
+// +build go1.6
+
+package humanize
+
+import (
+	"bytes"
+	"math/big"
+	"strings"
+)
+
+// BigCommaf produces a string form of the given big.Float in base 10
+// with commas after every three orders of magnitude.
+func BigCommaf(v *big.Float) string {
+	buf := &bytes.Buffer{}
+	if v.Sign() < 0 {
+		buf.Write([]byte{'-'})
+		v.Abs(v)
+	}
+
+	comma := []byte{','}
+
+	parts := strings.Split(v.Text('f', -1), ".")
+	pos := 0
+	if len(parts[0])%3 != 0 {
+		pos += len(parts[0]) % 3
+		buf.WriteString(parts[0][:pos])
+		buf.Write(comma)
+	}
+	for ; pos < len(parts[0]); pos += 3 {
+		buf.WriteString(parts[0][pos : pos+3])
+		buf.Write(comma)
+	}
+	buf.Truncate(buf.Len() - 1)
+
+	if len(parts) > 1 {
+		buf.Write([]byte{'.'})
+		buf.WriteString(parts[1])
+	}
+	return buf.String()
+}

vendor/github.com/dustin/go-humanize/ftoa.go

@@ -0,0 +1,49 @@
+package humanize
+
+import (
+	"strconv"
+	"strings"
+)
+
+func stripTrailingZeros(s string) string {
+	if !strings.ContainsRune(s, '.') {
+		return s
+	}
+	offset := len(s) - 1
+	for offset > 0 {
+		if s[offset] == '.' {
+			offset--
+			break
+		}
+		if s[offset] != '0' {
+			break
+		}
+		offset--
+	}
+	return s[:offset+1]
+}
+
+func stripTrailingDigits(s string, digits int) string {
+	if i := strings.Index(s, "."); i >= 0 {
+		if digits <= 0 {
+			return s[:i]
+		}
+		i++
+		if i+digits >= len(s) {
+			return s
+		}
+		return s[:i+digits]
+	}
+	return s
+}
+
+// Ftoa converts a float to a string with no trailing zeros.
+func Ftoa(num float64) string {
+	return stripTrailingZeros(strconv.FormatFloat(num, 'f', 6, 64))
+}
+
+// FtoaWithDigits converts a float to a string but limits the resulting string
+// to the given number of decimal places, and no trailing zeros.
+func FtoaWithDigits(num float64, digits int) string {
+	return stripTrailingZeros(stripTrailingDigits(strconv.FormatFloat(num, 'f', 6, 64), digits))
+}

vendor/github.com/dustin/go-humanize/humanize.go

@@ -0,0 +1,8 @@
+/*
+Package humanize converts boring ugly numbers to human-friendly strings and back.
+
+Durations can be turned into strings such as "3 days ago", numbers
+representing sizes like 82854982 into useful strings like, "83 MB" or
+"79 MiB" (whichever you prefer).
+*/
+package humanize

vendor/github.com/dustin/go-humanize/number.go

@@ -0,0 +1,192 @@
+package humanize
+
+/*
+Slightly adapted from the source to fit go-humanize.
+
+Author: https://github.com/gorhill
+Source: https://gist.github.com/gorhill/5285193
+
+*/
+
+import (
+	"math"
+	"strconv"
+)
+
+var (
+	renderFloatPrecisionMultipliers = [...]float64{
+		1,
+		10,
+		100,
+		1000,
+		10000,
+		100000,
+		1000000,
+		10000000,
+		100000000,
+		1000000000,
+	}
+
+	renderFloatPrecisionRounders = [...]float64{
+		0.5,
+		0.05,
+		0.005,
+		0.0005,
+		0.00005,
+		0.000005,
+		0.0000005,
+		0.00000005,
+		0.000000005,
+		0.0000000005,
+	}
+)
+
+// FormatFloat produces a formatted number as string based on the following user-specified criteria:
+// * thousands separator
+// * decimal separator
+// * decimal precision
+//
+// Usage: s := RenderFloat(format, n)
+// The format parameter tells how to render the number n.
+//
+// See examples: http://play.golang.org/p/LXc1Ddm1lJ
+//
+// Examples of format strings, given n = 12345.6789:
+// "#,###.##" => "12,345.67"
+// "#,###." => "12,345"
+// "#,###" => "12345,678"
+// "#\u202F###,##" => "12 345,68"
+// "#.###,###### => 12.345,678900
+// "" (aka default format) => 12,345.67
+//
+// The highest precision allowed is 9 digits after the decimal symbol.
+// There is also a version for integer number, FormatInteger(),
+// which is convenient for calls within template.
+func FormatFloat(format string, n float64) string {
+	// Special cases:
+	//   NaN = "NaN"
+	//   +Inf = "+Infinity"
+	//   -Inf = "-Infinity"
+	if math.IsNaN(n) {
+		return "NaN"
+	}
+	if n > math.MaxFloat64 {
+		return "Infinity"
+	}
+	if n < (0.0 - math.MaxFloat64) {
+		return "-Infinity"
+	}
+
+	// default format
+	precision := 2
+	decimalStr := "."
+	thousandStr := ","
+	positiveStr := ""
+	negativeStr := "-"
+
+	if len(format) > 0 {
+		format := []rune(format)
+
+		// If there is an explicit format directive,
+		// then default values are these:
+		precision = 9
+		thousandStr = ""
+
+		// collect indices of meaningful formatting directives
+		formatIndx := []int{}
+		for i, char := range format {
+			if char != '#' && char != '0' {
+				formatIndx = append(formatIndx, i)
+			}
+		}
+
+		if len(formatIndx) > 0 {
+			// Directive at index 0:
+			//   Must be a '+'
+			//   Raise an error if not the case
+			// index: 0123456789
+			//        +0.000,000
+			//        +000,000.0
+			//        +0000.00
+			//        +0000
+			if formatIndx[0] == 0 {
+				if format[formatIndx[0]] != '+' {
+					panic("RenderFloat(): invalid positive sign directive")
+				}
+				positiveStr = "+"
+				formatIndx = formatIndx[1:]
+			}
+
+			// Two directives:
+			//   First is thousands separator
+			//   Raise an error if not followed by 3-digit
+			// 0123456789
+			// 0.000,000
+			// 000,000.00
+			if len(formatIndx) == 2 {
+				if (formatIndx[1] - formatIndx[0]) != 4 {
+					panic("RenderFloat(): thousands separator directive must be followed by 3 digit-specifiers")
+				}
+				thousandStr = string(format[formatIndx[0]])
+				formatIndx = formatIndx[1:]
+			}
+
+			// One directive:
+			//   Directive is decimal separator
+			//   The number of digit-specifier following the separator indicates wanted precision
+			// 0123456789
+			// 0.00
+			// 000,0000
+			if len(formatIndx) == 1 {
+				decimalStr = string(format[formatIndx[0]])
+				precision = len(format) - formatIndx[0] - 1
+			}
+		}
+	}
+
+	// generate sign part
+	var signStr string
+	if n >= 0.000000001 {
+		signStr = positiveStr
+	} else if n <= -0.000000001 {
+		signStr = negativeStr
+		n = -n
+	} else {
+		signStr = ""
+		n = 0.0
+	}
+
+	// split number into integer and fractional parts
+	intf, fracf := math.Modf(n + renderFloatPrecisionRounders[precision])
+
+	// generate integer part string
+	intStr := strconv.FormatInt(int64(intf), 10)
+
+	// add thousand separator if required
+	if len(thousandStr) > 0 {
+		for i := len(intStr); i > 3; {
+			i -= 3
+			intStr = intStr[:i] + thousandStr + intStr[i:]
+		}
+	}
+
+	// no fractional part, we can leave now
+	if precision == 0 {
+		return signStr + intStr
+	}
+
+	// generate fractional part
+	fracStr := strconv.Itoa(int(fracf * renderFloatPrecisionMultipliers[precision]))
+	// may need padding
+	if len(fracStr) < precision {
+		fracStr = "000000000000000"[:precision-len(fracStr)] + fracStr
+	}
+
+	return signStr + intStr + decimalStr + fracStr
+}
+
+// FormatInteger produces a formatted number as string.
+// See FormatFloat.
+func FormatInteger(format string, n int) string {
+	return FormatFloat(format, float64(n))
+}

vendor/github.com/dustin/go-humanize/ordinals.go

@@ -0,0 +1,25 @@
+package humanize
+
+import "strconv"
+
+// Ordinal gives you the input number in a rank/ordinal format.
+//
+// Ordinal(3) -> 3rd
+func Ordinal(x int) string {
+	suffix := "th"
+	switch x % 10 {
+	case 1:
+		if x%100 != 11 {
+			suffix = "st"
+		}
+	case 2:
+		if x%100 != 12 {
+			suffix = "nd"
+		}
+	case 3:
+		if x%100 != 13 {
+			suffix = "rd"
+		}
+	}
+	return strconv.Itoa(x) + suffix
+}

vendor/github.com/dustin/go-humanize/si.go

@@ -0,0 +1,127 @@
+package humanize
+
+import (
+	"errors"
+	"math"
+	"regexp"
+	"strconv"
+)
+
+var siPrefixTable = map[float64]string{
+	-30: "q", // quecto
+	-27: "r", // ronto
+	-24: "y", // yocto
+	-21: "z", // zepto
+	-18: "a", // atto
+	-15: "f", // femto
+	-12: "p", // pico
+	-9:  "n", // nano
+	-6:  "µ", // micro
+	-3:  "m", // milli
+	0:   "",
+	3:   "k", // kilo
+	6:   "M", // mega
+	9:   "G", // giga
+	12:  "T", // tera
+	15:  "P", // peta
+	18:  "E", // exa
+	21:  "Z", // zetta
+	24:  "Y", // yotta
+	27:  "R", // ronna
+	30:  "Q", // quetta
+}
+
+var revSIPrefixTable = revfmap(siPrefixTable)
+
+// revfmap reverses the map and precomputes the power multiplier
+func revfmap(in map[float64]string) map[string]float64 {
+	rv := map[string]float64{}
+	for k, v := range in {
+		rv[v] = math.Pow(10, k)
+	}
+	return rv
+}
+
+var riParseRegex *regexp.Regexp
+
+func init() {
+	ri := `^([\-0-9.]+)\s?([`
+	for _, v := range siPrefixTable {
+		ri += v
+	}
+	ri += `]?)(.*)`
+
+	riParseRegex = regexp.MustCompile(ri)
+}
+
+// ComputeSI finds the most appropriate SI prefix for the given number
+// and returns the prefix along with the value adjusted to be within
+// that prefix.
+//
+// See also: SI, ParseSI.
+//
+// e.g. ComputeSI(2.2345e-12) -> (2.2345, "p")
+func ComputeSI(input float64) (float64, string) {
+	if input == 0 {
+		return 0, ""
+	}
+	mag := math.Abs(input)
+	exponent := math.Floor(logn(mag, 10))
+	exponent = math.Floor(exponent/3) * 3
+
+	value := mag / math.Pow(10, exponent)
+
+	// Handle special case where value is exactly 1000.0
+	// Should return 1 M instead of 1000 k
+	if value == 1000.0 {
+		exponent += 3
+		value = mag / math.Pow(10, exponent)
+	}
+
+	value = math.Copysign(value, input)
+
+	prefix := siPrefixTable[exponent]
+	return value, prefix
+}
+
+// SI returns a string with default formatting.
+//
+// SI uses Ftoa to format float value, removing trailing zeros.
+//
+// See also: ComputeSI, ParseSI.
+//
+// e.g. SI(1000000, "B") -> 1 MB
+// e.g. SI(2.2345e-12, "F") -> 2.2345 pF
+func SI(input float64, unit string) string {
+	value, prefix := ComputeSI(input)
+	return Ftoa(value) + " " + prefix + unit
+}
+
+// SIWithDigits works like SI but limits the resulting string to the
+// given number of decimal places.
+//
+// e.g. SIWithDigits(1000000, 0, "B") -> 1 MB
+// e.g. SIWithDigits(2.2345e-12, 2, "F") -> 2.23 pF
+func SIWithDigits(input float64, decimals int, unit string) string {
+	value, prefix := ComputeSI(input)
+	return FtoaWithDigits(value, decimals) + " " + prefix + unit
+}
+
+var errInvalid = errors.New("invalid input")
+
+// ParseSI parses an SI string back into the number and unit.
+//
+// See also: SI, ComputeSI.
+//
+// e.g. ParseSI("2.2345 pF") -> (2.2345e-12, "F", nil)
+func ParseSI(input string) (float64, string, error) {
+	found := riParseRegex.FindStringSubmatch(input)
+	if len(found) != 4 {
+		return 0, "", errInvalid
+	}
+	mag := revSIPrefixTable[found[2]]
+	unit := found[3]
+
+	base, err := strconv.ParseFloat(found[1], 64)
+	return base * mag, unit, err
+}

vendor/github.com/dustin/go-humanize/times.go

@@ -0,0 +1,117 @@
+package humanize
+
+import (
+	"fmt"
+	"math"
+	"sort"
+	"time"
+)
+
+// Seconds-based time units
+const (
+	Day      = 24 * time.Hour
+	Week     = 7 * Day
+	Month    = 30 * Day
+	Year     = 12 * Month
+	LongTime = 37 * Year
+)
+
+// Time formats a time into a relative string.
+//
+// Time(someT) -> "3 weeks ago"
+func Time(then time.Time) string {
+	return RelTime(then, time.Now(), "ago", "from now")
+}
+
+// A RelTimeMagnitude struct contains a relative time point at which
+// the relative format of time will switch to a new format string.  A
+// slice of these in ascending order by their "D" field is passed to
+// CustomRelTime to format durations.
+//
+// The Format field is a string that may contain a "%s" which will be
+// replaced with the appropriate signed label (e.g. "ago" or "from
+// now") and a "%d" that will be replaced by the quantity.
+//
+// The DivBy field is the amount of time the time difference must be
+// divided by in order to display correctly.
+//
+// e.g. if D is 2*time.Minute and you want to display "%d minutes %s"
+// DivBy should be time.Minute so whatever the duration is will be
+// expressed in minutes.
+type RelTimeMagnitude struct {
+	D      time.Duration
+	Format string
+	DivBy  time.Duration
+}
+
+var defaultMagnitudes = []RelTimeMagnitude{
+	{time.Second, "now", time.Second},
+	{2 * time.Second, "1 second %s", 1},
+	{time.Minute, "%d seconds %s", time.Second},
+	{2 * time.Minute, "1 minute %s", 1},
+	{time.Hour, "%d minutes %s", time.Minute},
+	{2 * time.Hour, "1 hour %s", 1},
+	{Day, "%d hours %s", time.Hour},
+	{2 * Day, "1 day %s", 1},
+	{Week, "%d days %s", Day},
+	{2 * Week, "1 week %s", 1},
+	{Month, "%d weeks %s", Week},
+	{2 * Month, "1 month %s", 1},
+	{Year, "%d months %s", Month},
+	{18 * Month, "1 year %s", 1},
+	{2 * Year, "2 years %s", 1},
+	{LongTime, "%d years %s", Year},
+	{math.MaxInt64, "a long while %s", 1},
+}
+
+// RelTime formats a time into a relative string.
+//
+// It takes two times and two labels.  In addition to the generic time
+// delta string (e.g. 5 minutes), the labels are used applied so that
+// the label corresponding to the smaller time is applied.
+//
+// RelTime(timeInPast, timeInFuture, "earlier", "later") -> "3 weeks earlier"
+func RelTime(a, b time.Time, albl, blbl string) string {
+	return CustomRelTime(a, b, albl, blbl, defaultMagnitudes)
+}
+
+// CustomRelTime formats a time into a relative string.
+//
+// It takes two times two labels and a table of relative time formats.
+// In addition to the generic time delta string (e.g. 5 minutes), the
+// labels are used applied so that the label corresponding to the
+// smaller time is applied.
+func CustomRelTime(a, b time.Time, albl, blbl string, magnitudes []RelTimeMagnitude) string {
+	lbl := albl
+	diff := b.Sub(a)
+
+	if a.After(b) {
+		lbl = blbl
+		diff = a.Sub(b)
+	}
+
+	n := sort.Search(len(magnitudes), func(i int) bool {
+		return magnitudes[i].D > diff
+	})
+
+	if n >= len(magnitudes) {
+		n = len(magnitudes) - 1
+	}
+	mag := magnitudes[n]
+	args := []interface{}{}
+	escaped := false
+	for _, ch := range mag.Format {
+		if escaped {
+			switch ch {
+			case 's':
+				args = append(args, lbl)
+			case 'd':
+				args = append(args, diff/mag.DivBy)
+			}
+			escaped = false
+		} else {
+			escaped = ch == '%'
+		}
+	}
+	return fmt.Sprintf(mag.Format, args...)
+}

vendor/github.com/golang-sql/civil/CONTRIBUTING.md

@@ -0,0 +1,73 @@
+# Contributing
+
+1. Sign one of the contributor license agreements below.
+
+#### Running
+
+Once you've done the necessary setup, you can run the integration tests by
+running:
+
+``` sh
+$ go test -v github.com/golang-sql/civil
+```
+
+## Contributor License Agreements
+
+Before we can accept your pull requests you'll need to sign a Contributor
+License Agreement (CLA):
+
+- **If you are an individual writing original source code** and **you own the
+intellectual property**, then you'll need to sign an [individual CLA][indvcla].
+- **If you work for a company that wants to allow you to contribute your
+work**, then you'll need to sign a [corporate CLA][corpcla].
+
+You can sign these electronically (just scroll to the bottom). After that,
+we'll be able to accept your pull requests.
+
+## Contributor Code of Conduct
+
+As contributors and maintainers of this project,
+and in the interest of fostering an open and welcoming community,
+we pledge to respect all people who contribute through reporting issues,
+posting feature requests, updating documentation,
+submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project
+a harassment-free experience for everyone,
+regardless of level of experience, gender, gender identity and expression,
+sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information,
+such as physical or electronic
+addresses, without explicit permission
+* Other unethical or unprofessional conduct.
+
+Project maintainers have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct.
+By adopting this Code of Conduct,
+project maintainers commit themselves to fairly and consistently
+applying these principles to every aspect of managing this project.
+Project maintainers who do not follow or enforce the Code of Conduct
+may be permanently removed from the project team.
+
+This code of conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported by opening an issue
+or contacting one or more of the project maintainers.
+
+This Code of Conduct is adapted from the [Contributor Covenant](http://contributor-covenant.org), version 1.2.0,
+available at [http://contributor-covenant.org/version/1/2/0/](http://contributor-covenant.org/version/1/2/0/)
+
+[gcloudcli]: https://developers.google.com/cloud/sdk/gcloud/
+[indvcla]: https://developers.google.com/open-source/cla/individual
+[corpcla]: https://developers.google.com/open-source/cla/corporate

vendor/github.com/golang-sql/civil/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
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+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/golang-sql/civil/README.md

@@ -0,0 +1,15 @@
+# Civil Date and Time
+
+[![GoDoc](https://godoc.org/github.com/golang-sql/civil?status.svg)](https://godoc.org/github.com/golang-sql/civil)
+
+Civil provides Date, Time of Day, and DateTime data types.
+
+While there are many uses, using specific types when working
+with databases make is conceptually eaiser to understand what value
+is set in the remote system.
+
+## Source
+
+This civil package was extracted and forked from `cloud.google.com/go/civil`.
+As such the license and contributing requirements remain the same as that
+module.

vendor/github.com/golang-sql/civil/civil.go

@@ -0,0 +1,292 @@
+// Copyright 2016 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package civil implements types for civil time, a time-zone-independent
+// representation of time that follows the rules of the proleptic
+// Gregorian calendar with exactly 24-hour days, 60-minute hours, and 60-second
+// minutes.
+//
+// Because they lack location information, these types do not represent unique
+// moments or intervals of time. Use time.Time for that purpose.
+package civil
+
+import (
+	"fmt"
+	"time"
+)
+
+// A Date represents a date (year, month, day).
+//
+// This type does not include location information, and therefore does not
+// describe a unique 24-hour timespan.
+type Date struct {
+	Year  int        // Year (e.g., 2014).
+	Month time.Month // Month of the year (January = 1, ...).
+	Day   int        // Day of the month, starting at 1.
+}
+
+// DateOf returns the Date in which a time occurs in that time's location.
+func DateOf(t time.Time) Date {
+	var d Date
+	d.Year, d.Month, d.Day = t.Date()
+	return d
+}
+
+// ParseDate parses a string in RFC3339 full-date format and returns the date value it represents.
+func ParseDate(s string) (Date, error) {
+	t, err := time.Parse("2006-01-02", s)
+	if err != nil {
+		return Date{}, err
+	}
+	return DateOf(t), nil
+}
+
+// String returns the date in RFC3339 full-date format.
+func (d Date) String() string {
+	return fmt.Sprintf("%04d-%02d-%02d", d.Year, d.Month, d.Day)
+}
+
+// IsValid reports whether the date is valid.
+func (d Date) IsValid() bool {
+	return DateOf(d.In(time.UTC)) == d
+}
+
+// In returns the time corresponding to time 00:00:00 of the date in the location.
+//
+// In is always consistent with time.Date, even when time.Date returns a time
+// on a different day. For example, if loc is America/Indiana/Vincennes, then both
+//     time.Date(1955, time.May, 1, 0, 0, 0, 0, loc)
+// and
+//     civil.Date{Year: 1955, Month: time.May, Day: 1}.In(loc)
+// return 23:00:00 on April 30, 1955.
+//
+// In panics if loc is nil.
+func (d Date) In(loc *time.Location) time.Time {
+	return time.Date(d.Year, d.Month, d.Day, 0, 0, 0, 0, loc)
+}
+
+// AddDays returns the date that is n days in the future.
+// n can also be negative to go into the past.
+func (d Date) AddDays(n int) Date {
+	return DateOf(d.In(time.UTC).AddDate(0, 0, n))
+}
+
+// DaysSince returns the signed number of days between the date and s, not including the end day.
+// This is the inverse operation to AddDays.
+func (d Date) DaysSince(s Date) (days int) {
+	// We convert to Unix time so we do not have to worry about leap seconds:
+	// Unix time increases by exactly 86400 seconds per day.
+	deltaUnix := d.In(time.UTC).Unix() - s.In(time.UTC).Unix()
+	return int(deltaUnix / 86400)
+}
+
+// Before reports whether d1 occurs before d2.
+func (d1 Date) Before(d2 Date) bool {
+	if d1.Year != d2.Year {
+		return d1.Year < d2.Year
+	}
+	if d1.Month != d2.Month {
+		return d1.Month < d2.Month
+	}
+	return d1.Day < d2.Day
+}
+
+// After reports whether d1 occurs after d2.
+func (d1 Date) After(d2 Date) bool {
+	return d2.Before(d1)
+}
+
+// IsZero reports whether date fields are set to their default value.
+func (d Date) IsZero() bool {
+	return (d.Year == 0) && (int(d.Month) == 0) && (d.Day == 0)
+}
+
+// MarshalText implements the encoding.TextMarshaler interface.
+// The output is the result of d.String().
+func (d Date) MarshalText() ([]byte, error) {
+	return []byte(d.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface.
+// The date is expected to be a string in a format accepted by ParseDate.
+func (d *Date) UnmarshalText(data []byte) error {
+	var err error
+	*d, err = ParseDate(string(data))
+	return err
+}
+
+// A Time represents a time with nanosecond precision.
+//
+// This type does not include location information, and therefore does not
+// describe a unique moment in time.
+//
+// This type exists to represent the TIME type in storage-based APIs like BigQuery.
+// Most operations on Times are unlikely to be meaningful. Prefer the DateTime type.
+type Time struct {
+	Hour       int // The hour of the day in 24-hour format; range [0-23]
+	Minute     int // The minute of the hour; range [0-59]
+	Second     int // The second of the minute; range [0-59]
+	Nanosecond int // The nanosecond of the second; range [0-999999999]
+}
+
+// TimeOf returns the Time representing the time of day in which a time occurs
+// in that time's location. It ignores the date.
+func TimeOf(t time.Time) Time {
+	var tm Time
+	tm.Hour, tm.Minute, tm.Second = t.Clock()
+	tm.Nanosecond = t.Nanosecond()
+	return tm
+}
+
+// ParseTime parses a string and returns the time value it represents.
+// ParseTime accepts an extended form of the RFC3339 partial-time format. After
+// the HH:MM:SS part of the string, an optional fractional part may appear,
+// consisting of a decimal point followed by one to nine decimal digits.
+// (RFC3339 admits only one digit after the decimal point).
+func ParseTime(s string) (Time, error) {
+	t, err := time.Parse("15:04:05.999999999", s)
+	if err != nil {
+		return Time{}, err
+	}
+	return TimeOf(t), nil
+}
+
+// String returns the date in the format described in ParseTime. If Nanoseconds
+// is zero, no fractional part will be generated. Otherwise, the result will
+// end with a fractional part consisting of a decimal point and nine digits.
+func (t Time) String() string {
+	s := fmt.Sprintf("%02d:%02d:%02d", t.Hour, t.Minute, t.Second)
+	if t.Nanosecond == 0 {
+		return s
+	}
+	return s + fmt.Sprintf(".%09d", t.Nanosecond)
+}
+
+// IsValid reports whether the time is valid.
+func (t Time) IsValid() bool {
+	// Construct a non-zero time.
+	tm := time.Date(2, 2, 2, t.Hour, t.Minute, t.Second, t.Nanosecond, time.UTC)
+	return TimeOf(tm) == t
+}
+
+// IsZero reports whether time fields are set to their default value.
+func (t Time) IsZero() bool {
+	return (t.Hour == 0) && (t.Minute == 0) && (t.Second == 0) && (t.Nanosecond == 0)
+}
+
+// MarshalText implements the encoding.TextMarshaler interface.
+// The output is the result of t.String().
+func (t Time) MarshalText() ([]byte, error) {
+	return []byte(t.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface.
+// The time is expected to be a string in a format accepted by ParseTime.
+func (t *Time) UnmarshalText(data []byte) error {
+	var err error
+	*t, err = ParseTime(string(data))
+	return err
+}
+
+// A DateTime represents a date and time.
+//
+// This type does not include location information, and therefore does not
+// describe a unique moment in time.
+type DateTime struct {
+	Date Date
+	Time Time
+}
+
+// Note: We deliberately do not embed Date into DateTime, to avoid promoting AddDays and Sub.
+
+// DateTimeOf returns the DateTime in which a time occurs in that time's location.
+func DateTimeOf(t time.Time) DateTime {
+	return DateTime{
+		Date: DateOf(t),
+		Time: TimeOf(t),
+	}
+}
+
+// ParseDateTime parses a string and returns the DateTime it represents.
+// ParseDateTime accepts a variant of the RFC3339 date-time format that omits
+// the time offset but includes an optional fractional time, as described in
+// ParseTime. Informally, the accepted format is
+//     YYYY-MM-DDTHH:MM:SS[.FFFFFFFFF]
+// where the 'T' may be a lower-case 't'.
+func ParseDateTime(s string) (DateTime, error) {
+	t, err := time.Parse("2006-01-02T15:04:05.999999999", s)
+	if err != nil {
+		t, err = time.Parse("2006-01-02t15:04:05.999999999", s)
+		if err != nil {
+			return DateTime{}, err
+		}
+	}
+	return DateTimeOf(t), nil
+}
+
+// String returns the date in the format described in ParseDate.
+func (dt DateTime) String() string {
+	return dt.Date.String() + "T" + dt.Time.String()
+}
+
+// IsValid reports whether the datetime is valid.
+func (dt DateTime) IsValid() bool {
+	return dt.Date.IsValid() && dt.Time.IsValid()
+}
+
+// In returns the time corresponding to the DateTime in the given location.
+//
+// If the time is missing or ambigous at the location, In returns the same
+// result as time.Date. For example, if loc is America/Indiana/Vincennes, then
+// both
+//     time.Date(1955, time.May, 1, 0, 30, 0, 0, loc)
+// and
+//     civil.DateTime{
+//         civil.Date{Year: 1955, Month: time.May, Day: 1}},
+//         civil.Time{Minute: 30}}.In(loc)
+// return 23:30:00 on April 30, 1955.
+//
+// In panics if loc is nil.
+func (dt DateTime) In(loc *time.Location) time.Time {
+	return time.Date(dt.Date.Year, dt.Date.Month, dt.Date.Day, dt.Time.Hour, dt.Time.Minute, dt.Time.Second, dt.Time.Nanosecond, loc)
+}
+
+// Before reports whether dt1 occurs before dt2.
+func (dt1 DateTime) Before(dt2 DateTime) bool {
+	return dt1.In(time.UTC).Before(dt2.In(time.UTC))
+}
+
+// After reports whether dt1 occurs after dt2.
+func (dt1 DateTime) After(dt2 DateTime) bool {
+	return dt2.Before(dt1)
+}
+
+// IsZero reports whether datetime fields are set to their default value.
+func (dt DateTime) IsZero() bool {
+	return dt.Date.IsZero() && dt.Time.IsZero()
+}
+
+// MarshalText implements the encoding.TextMarshaler interface.
+// The output is the result of dt.String().
+func (dt DateTime) MarshalText() ([]byte, error) {
+	return []byte(dt.String()), nil
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface.
+// The datetime is expected to be a string in a format accepted by ParseDateTime
+func (dt *DateTime) UnmarshalText(data []byte) error {
+	var err error
+	*dt, err = ParseDateTime(string(data))
+	return err
+}

vendor/github.com/golang-sql/sqlexp/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2017 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/golang-sql/sqlexp/PATENTS

@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go.  This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation.  If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.

vendor/github.com/golang-sql/sqlexp/README.md

@@ -0,0 +1,5 @@
+# golang-sql exp
+
+https://godoc.org/github.com/golang-sql/sqlexp
+
+All contributions must have a valid golang CLA.

vendor/github.com/golang-sql/sqlexp/doc.go

@@ -0,0 +1,8 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sqlexp provides interfaces and functions that may be adopted into
+// the database/sql package in the future. All features may change or be removed
+// in the future.
+package sqlexp // imports github.com/golang-sql/sqlexp

vendor/github.com/golang-sql/sqlexp/messages.go

@@ -0,0 +1,80 @@
+package sqlexp
+
+import (
+	"context"
+	"fmt"
+)
+
+// RawMessage is returned from RowsMessage.
+type RawMessage interface{}
+
+// ReturnMessage may be passed into a Query argument.
+//
+// Drivers must implement driver.NamedValueChecker,
+// call ReturnMessageInit on it, save it internally,
+// and return driver.ErrOmitArgument to prevent
+// this from appearing in the query arguments.
+//
+// Queries that recieve this message should also not return
+// SQL errors from the Query method, but wait to return
+// it in a Message.
+type ReturnMessage struct {
+	queue chan RawMessage
+}
+
+// Message is called by clients after Query to dequeue messages.
+func (m *ReturnMessage) Message(ctx context.Context) RawMessage {
+	select {
+	case <-ctx.Done():
+		return MsgNextResultSet{}
+	case raw := <-m.queue:
+		return raw
+	}
+}
+
+// ReturnMessageEnqueue is called by the driver to enqueue the driver.
+// Drivers should not call this until after it returns from Query.
+func ReturnMessageEnqueue(ctx context.Context, m *ReturnMessage, raw RawMessage) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case m.queue <- raw:
+		return nil
+	}
+}
+
+// ReturnMessageInit is called by database/sql setup the ReturnMessage internals.
+func ReturnMessageInit(m *ReturnMessage) {
+	m.queue = make(chan RawMessage, 15)
+}
+
+type (
+	// MsgNextResultSet must be checked for. When received, NextResultSet
+	// should be called and if false the message loop should be exited.
+	MsgNextResultSet struct{}
+
+	// MsgNext indicates the result set ready to be scanned.
+	// This message will often be followed with:
+	//
+	//	for rows.Next() {
+	//		rows.Scan(&v)
+	//	}
+	MsgNext struct{}
+
+	// MsgRowsAffected returns the number of rows affected.
+	// Not all operations that affect rows return results, thus this message
+	// may be received multiple times.
+	MsgRowsAffected struct{ Count int64 }
+
+	// MsgLastInsertID returns the value of last inserted row. For many
+	// database systems and tables this will return int64. Some databases
+	// may return a string or GUID equivalent.
+	MsgLastInsertID struct{ Value interface{} }
+
+	// MsgNotice is raised from the SQL text and is only informational.
+	MsgNotice struct{ Message fmt.Stringer }
+
+	// MsgError returns SQL errors from the database system (not transport
+	// or other system level errors).
+	MsgError struct{ Error error }
+)

vendor/github.com/golang-sql/sqlexp/mssql.go

@@ -0,0 +1,73 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"context"
+	"database/sql/driver"
+	"fmt"
+	"strings"
+)
+
+type mssql struct{}
+
+var (
+	_ DriverNamer       = mssql{}
+	_ DriverQuoter      = mssql{}
+	_ DriverSavepointer = mssql{}
+)
+
+func (mssql) Open(string) (driver.Conn, error) {
+	panic("not implemented")
+}
+
+func (mssql) Namer(ctx context.Context) (Namer, error) {
+	return sqlServerNamer{}, nil
+}
+
+func (mssql) Quoter(ctx context.Context) (Quoter, error) {
+	return sqlServerQuoter{}, nil
+}
+
+func (mssql) Savepointer() (Savepointer, error) {
+	return sqlServerSavepointer{}, nil
+}
+
+type sqlServerNamer struct{}
+
+func (sqlServerNamer) Name() string {
+	return "sqlserver"
+}
+func (sqlServerNamer) Dialect() string {
+	return DialectTSQL
+}
+
+type sqlServerQuoter struct{}
+
+func (sqlServerQuoter) ID(name string) string {
+	return "[" + strings.Replace(name, "]", "]]", -1) + "]"
+}
+func (sqlServerQuoter) Value(v interface{}) string {
+	switch v := v.(type) {
+	default:
+		panic("unsupported value")
+	case string:
+		return "'" + strings.Replace(v, "'", "''", -1) + "'"
+	}
+}
+
+type sqlServerSavepointer struct{}
+
+func (sqlServerSavepointer) Release(name string) string {
+	return ""
+}
+
+func (sqlServerSavepointer) Create(name string) string {
+	return fmt.Sprintf("save tran %s;", name)
+}
+
+func (sqlServerSavepointer) Rollback(name string) string {
+	return fmt.Sprintf("rollback tran %s;", name)
+}

vendor/github.com/golang-sql/sqlexp/namer.go

@@ -0,0 +1,59 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"context"
+	"database/sql/driver"
+	"errors"
+	"reflect"
+)
+
+const (
+	DialectPostgres = "postgres"
+	DialectTSQL     = "tsql"
+	DialectMySQL    = "mysql"
+	DialectSQLite   = "sqlite"
+	DialectOracle   = "oracle"
+)
+
+// Namer returns the name of the database and the SQL dialect it
+// uses.
+type Namer interface {
+	// Name of the database management system.
+	//
+	// Examples:
+	//    "posgresql-9.6"
+	//    "sqlserver-10.54.32"
+	//    "cockroachdb-1.0"
+	Name() string
+
+	// Dialect of SQL used in the database.
+	Dialect() string
+}
+
+// DriverNamer may be implemented on the driver.Driver interface.
+// It may need to request information from the server to return
+// the correct information.
+type DriverNamer interface {
+	Namer(ctx context.Context) (Namer, error)
+}
+
+// NamerFromDriver returns the DriverNamer from the DB if
+// it is implemented.
+func NamerFromDriver(d driver.Driver, ctx context.Context) (Namer, error) {
+	if q, is := d.(DriverNamer); is {
+		return q.Namer(ctx)
+	}
+	dv := reflect.ValueOf(d)
+
+	d, found := internalDrivers[dv.Type().String()]
+	if found {
+		if q, is := d.(DriverNamer); is {
+			return q.Namer(ctx)
+		}
+	}
+	return nil, errors.New("namer not found")
+}

vendor/github.com/golang-sql/sqlexp/pg.go

@@ -0,0 +1,67 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"context"
+	"database/sql/driver"
+	"fmt"
+)
+
+type postgresql struct{}
+
+var (
+	_ DriverNamer       = postgresql{}
+	_ DriverQuoter      = postgresql{}
+	_ DriverSavepointer = postgresql{}
+)
+
+func (postgresql) Open(string) (driver.Conn, error) {
+	panic("not implemented")
+}
+
+func (postgresql) Namer(ctx context.Context) (Namer, error) {
+	return pgNamer{}, nil
+}
+
+func (postgresql) Quoter(ctx context.Context) (Quoter, error) {
+	panic("not implemented")
+}
+
+func (postgresql) Savepointer() (Savepointer, error) {
+	return pgSavepointer{}, nil
+}
+
+type pgNamer struct{}
+
+func (pgNamer) Name() string {
+	return "postgresql"
+}
+func (pgNamer) Dialect() string {
+	return DialectPostgres
+}
+
+type pgQuoter struct{}
+
+func (pgQuoter) ID(name string) string {
+	return ""
+}
+func (pgQuoter) Value(v interface{}) string {
+	return ""
+}
+
+type pgSavepointer struct{}
+
+func (pgSavepointer) Release(name string) string {
+	return fmt.Sprintf("release savepoint %s;", name)
+}
+
+func (pgSavepointer) Create(name string) string {
+	return fmt.Sprintf("savepoint %s;", name)
+}
+
+func (pgSavepointer) Rollback(name string) string {
+	return fmt.Sprintf("rollback to savepoint %s;", name)
+}

vendor/github.com/golang-sql/sqlexp/querier.go

@@ -0,0 +1,22 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"context"
+	"database/sql"
+)
+
+// Querier is the common interface to execute queries on a DB, Tx, or Conn.
+type Querier interface {
+	ExecContext(ctx context.Context, query string, args ...interface{}) (sql.Result, error)
+	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
+	QueryRowContext(ctx context.Context, query string, args ...interface{}) *sql.Row
+}
+
+var (
+	_ Querier = &sql.DB{}
+	_ Querier = &sql.Tx{}
+)

vendor/github.com/golang-sql/sqlexp/quoter.go

@@ -0,0 +1,57 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"context"
+	"database/sql/driver"
+	"errors"
+	"reflect"
+)
+
+// BUG(kardianos): Both the Quoter and Namer may need to access the server.
+
+// Quoter returns safe and valid SQL strings to use when building a SQL text.
+type Quoter interface {
+	// ID quotes identifiers such as schema, table, or column names.
+	// ID does not operate on multipart identifiers such as "public.Table",
+	// it only operates on single identifiers such as "public" and "Table".
+	ID(name string) string
+
+	// Value quotes database values such as string or []byte types as strings
+	// that are suitable and safe to embed in SQL text. The returned value
+	// of a string will include all surrounding quotes.
+	//
+	// If a value type is not supported it must panic.
+	Value(v interface{}) string
+}
+
+// DriverQuoter returns a Quoter interface and is suitable for extending
+// the driver.Driver type.
+//
+// The driver may need to hit the database to determine how it is configured to
+// ensure the correct escaping rules are used.
+type DriverQuoter interface {
+	Quoter(ctx context.Context) (Quoter, error)
+}
+
+// QuoterFromDriver takes a database driver, often obtained through a sql.DB.Driver
+// call or from using it directly to get the quoter interface.
+//
+// Currently MssqlDriver is hard-coded to also return a valided Quoter.
+func QuoterFromDriver(d driver.Driver, ctx context.Context) (Quoter, error) {
+	if q, is := d.(DriverQuoter); is {
+		return q.Quoter(ctx)
+	}
+	dv := reflect.ValueOf(d)
+
+	d, found := internalDrivers[dv.Type().String()]
+	if found {
+		if q, is := d.(DriverQuoter); is {
+			return q.Quoter(ctx)
+		}
+	}
+	return nil, errors.New("quoter interface not found")
+}

vendor/github.com/golang-sql/sqlexp/registry.go

@@ -0,0 +1,15 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"database/sql/driver"
+)
+
+var internalDrivers = map[string]driver.Driver{
+	"*mssql.MssqlDriver": mssql{},
+	"*pq.Driver":         postgresql{},
+	"*stdlib.Driver":     postgresql{},
+}

vendor/github.com/golang-sql/sqlexp/savepoint.go

@@ -0,0 +1,37 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sqlexp
+
+import (
+	"database/sql/driver"
+	"errors"
+	"reflect"
+)
+
+type Savepointer interface {
+	Release(name string) string
+	Create(name string) string
+	Rollback(name string) string
+}
+
+type DriverSavepointer interface {
+	Savepointer() (Savepointer, error)
+}
+
+// SavepointFromDriver
+func SavepointFromDriver(d driver.Driver) (Savepointer, error) {
+	if q, is := d.(DriverSavepointer); is {
+		return q.Savepointer()
+	}
+	dv := reflect.ValueOf(d)
+
+	d, found := internalDrivers[dv.Type().String()]
+	if found {
+		if q, is := d.(DriverSavepointer); is {
+			return q.Savepointer()
+		}
+	}
+	return nil, errors.New("savepointer interface not found")
+}

vendor/github.com/mattn/go-isatty/LICENSE

@@ -0,0 +1,9 @@
+Copyright (c) Yasuhiro MATSUMOTO <mattn.jp@gmail.com>
+
+MIT License (Expat)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/mattn/go-isatty/README.md

@@ -0,0 +1,50 @@
+# go-isatty
+
+[![Godoc Reference](https://godoc.org/github.com/mattn/go-isatty?status.svg)](http://godoc.org/github.com/mattn/go-isatty)
+[![Codecov](https://codecov.io/gh/mattn/go-isatty/branch/master/graph/badge.svg)](https://codecov.io/gh/mattn/go-isatty)
+[![Coverage Status](https://coveralls.io/repos/github/mattn/go-isatty/badge.svg?branch=master)](https://coveralls.io/github/mattn/go-isatty?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/mattn/go-isatty)](https://goreportcard.com/report/mattn/go-isatty)
+
+isatty for golang
+
+## Usage
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/mattn/go-isatty"
+	"os"
+)
+
+func main() {
+	if isatty.IsTerminal(os.Stdout.Fd()) {
+		fmt.Println("Is Terminal")
+	} else if isatty.IsCygwinTerminal(os.Stdout.Fd()) {
+		fmt.Println("Is Cygwin/MSYS2 Terminal")
+	} else {
+		fmt.Println("Is Not Terminal")
+	}
+}
+```
+
+## Installation
+
+```
+$ go get github.com/mattn/go-isatty
+```
+
+## License
+
+MIT
+
+## Author
+
+Yasuhiro Matsumoto (a.k.a mattn)
+
+## Thanks
+
+* k-takata: base idea for IsCygwinTerminal
+
+    https://github.com/k-takata/go-iscygpty