feat(writer): enhance type conversion for PostgreSQL compatibility and add tests

- Implemented ExecutionReport to track the execution status of SQL statements.
- Added SchemaReport and TableReport to monitor execution per schema and table.
- Enhanced WriteDatabase to execute SQL directly on a PostgreSQL database if a connection string is provided.
- Included error handling and logging for failed statements during execution.
- Added functionality to write execution reports to a JSON file.
- Introduced utility functions to extract table names from CREATE TABLE statements and truncate long SQL statements for error messages.

.github/workflows/integration-tests.yml

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

cmd/relspec/merge.go

@@ -55,6 +55,7 @@ var (
 	mergeSkipSequences bool
 	mergeSkipTables    string // Comma-separated table names to skip
 	mergeVerbose       bool
+	mergeReportPath    string // Path to write merge report
 )
 
 var mergeCmd = &cobra.Command{
@@ -78,6 +79,12 @@ Examples:
                 --source pgsql --source-conn "postgres://user:pass@localhost/source_db" \
                 --output json --output-path combined.json
 
+  # Merge and execute on PostgreSQL database with report
+  relspec merge --target json --target-path base.json \
+                --source json --source-path additional.json \
+                --output pgsql --output-conn "postgres://user:pass@localhost/target_db" \
+                --merge-report merge-report.json
+
   # Merge DBML and YAML, skip relations
   relspec merge --target dbml --target-path schema.dbml \
                 --source yaml --source-path tables.yaml \
@@ -115,6 +122,7 @@ func init() {
 	mergeCmd.Flags().BoolVar(&mergeSkipSequences, "skip-sequences", false, "Skip sequences during merge")
 	mergeCmd.Flags().StringVar(&mergeSkipTables, "skip-tables", "", "Comma-separated list of table names to skip during merge")
 	mergeCmd.Flags().BoolVar(&mergeVerbose, "verbose", false, "Show verbose output")
+	mergeCmd.Flags().StringVar(&mergeReportPath, "merge-report", "", "Path to write merge report (JSON format)")
 }
 
 func runMerge(cmd *cobra.Command, args []string) error {
@@ -229,7 +237,7 @@ func runMerge(cmd *cobra.Command, args []string) error {
 		fmt.Fprintf(os.Stderr, "      Path:   %s\n", mergeOutputPath)
 	}
 
-	err = writeDatabaseForMerge(mergeOutputType, mergeOutputPath, "", targetDB, "Output")
+	err = writeDatabaseForMerge(mergeOutputType, mergeOutputPath, mergeOutputConn, targetDB, "Output")
 	if err != nil {
 		return fmt.Errorf("failed to write output: %w", err)
 	}
@@ -376,7 +384,17 @@ func writeDatabaseForMerge(dbType, filePath, connString string, db *models.Datab
 		}
 		writer = wtypeorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
 	case "pgsql":
-		writer = wpgsql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writerOpts := &writers.WriterOptions{OutputPath: filePath}
+		if connString != "" {
+			writerOpts.Metadata = map[string]interface{}{
+				"connection_string": connString,
+			}
+			// Add report path if merge report is enabled
+			if mergeReportPath != "" {
+				writerOpts.Metadata["report_path"] = mergeReportPath
+			}
+		}
+		writer = wpgsql.NewWriter(writerOpts)
 	default:
 		return fmt.Errorf("%s: unsupported format '%s'", label, dbType)
 	}

pkg/pgsql/datatypes.go

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

pkg/readers/bun/reader.go

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

pkg/readers/dbml/reader.go

@@ -4,7 +4,9 @@ import (
 	"bufio"
 	"fmt"
 	"os"
+	"path/filepath"
 	"regexp"
+	"sort"
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
@@ -24,11 +26,23 @@ func NewReader(options *readers.ReaderOptions) *Reader {
 }
 
 // ReadDatabase reads and parses DBML input, returning a Database model
+// If FilePath points to a directory, all .dbml files are loaded and merged
 func (r *Reader) ReadDatabase() (*models.Database, error) {
 	if r.options.FilePath == "" {
 		return nil, fmt.Errorf("file path is required for DBML reader")
 	}
 
+	// Check if path is a directory
+	info, err := os.Stat(r.options.FilePath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to stat path: %w", err)
+	}
+
+	if info.IsDir() {
+		return r.readDirectoryDBML(r.options.FilePath)
+	}
+
+	// Single file - existing logic
 	content, err := os.ReadFile(r.options.FilePath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read file: %w", err)
@@ -67,15 +81,301 @@ func (r *Reader) ReadTable() (*models.Table, error) {
 	return schema.Tables[0], nil
 }
 
-// stripQuotes removes surrounding quotes from an identifier
+// readDirectoryDBML processes all .dbml files in directory
+// Returns merged Database model
+func (r *Reader) readDirectoryDBML(dirPath string) (*models.Database, error) {
+	// Discover and sort DBML files
+	files, err := r.discoverDBMLFiles(dirPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to discover DBML files: %w", err)
+	}
+
+	// If no files found, return empty database
+	if len(files) == 0 {
+		db := models.InitDatabase("database")
+		if r.options.Metadata != nil {
+			if name, ok := r.options.Metadata["name"].(string); ok {
+				db.Name = name
+			}
+		}
+		return db, nil
+	}
+
+	// Initialize database (will be merged with files)
+	var db *models.Database
+
+	// Process each file in sorted order
+	for _, filePath := range files {
+		content, err := os.ReadFile(filePath)
+		if err != nil {
+			return nil, fmt.Errorf("failed to read file %s: %w", filePath, err)
+		}
+
+		fileDB, err := r.parseDBML(string(content))
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse file %s: %w", filePath, err)
+		}
+
+		// First file initializes the database
+		if db == nil {
+			db = fileDB
+		} else {
+			// Subsequent files are merged
+			mergeDatabase(db, fileDB)
+		}
+	}
+
+	return db, nil
+}
+
+// stripQuotes removes surrounding quotes and comments from an identifier
 func stripQuotes(s string) string {
 	s = strings.TrimSpace(s)
+
+	// Remove DBML comments in brackets (e.g., [note: 'description'])
+	// This handles inline comments like: "table_name" [note: 'comment']
+	commentRegex := regexp.MustCompile(`\s*\[.*?\]\s*`)
+	s = commentRegex.ReplaceAllString(s, "")
+
+	// Trim again after removing comments
+	s = strings.TrimSpace(s)
+
+	// Remove surrounding quotes (double or single)
 	if len(s) >= 2 && ((s[0] == '"' && s[len(s)-1] == '"') || (s[0] == '\'' && s[len(s)-1] == '\'')) {
 		return s[1 : len(s)-1]
 	}
 	return s
 }
 
+// parseFilePrefix extracts numeric prefix from filename
+// Examples: "1_schema.dbml" -> (1, true), "tables.dbml" -> (0, false)
+func parseFilePrefix(filename string) (int, bool) {
+	base := filepath.Base(filename)
+	re := regexp.MustCompile(`^(\d+)[_-]`)
+	matches := re.FindStringSubmatch(base)
+	if len(matches) > 1 {
+		var prefix int
+		_, err := fmt.Sscanf(matches[1], "%d", &prefix)
+		if err == nil {
+			return prefix, true
+		}
+	}
+	return 0, false
+}
+
+// hasCommentedRefs scans file content for commented-out Ref statements
+// Returns true if file contains lines like: // Ref: table.col > other.col
+func hasCommentedRefs(filePath string) (bool, error) {
+	content, err := os.ReadFile(filePath)
+	if err != nil {
+		return false, err
+	}
+
+	scanner := bufio.NewScanner(strings.NewReader(string(content)))
+	commentedRefRegex := regexp.MustCompile(`^\s*//.*Ref:\s+`)
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		if commentedRefRegex.MatchString(line) {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+// discoverDBMLFiles finds all .dbml files in directory and returns them sorted
+func (r *Reader) discoverDBMLFiles(dirPath string) ([]string, error) {
+	pattern := filepath.Join(dirPath, "*.dbml")
+	files, err := filepath.Glob(pattern)
+	if err != nil {
+		return nil, fmt.Errorf("failed to glob .dbml files: %w", err)
+	}
+
+	return sortDBMLFiles(files), nil
+}
+
+// sortDBMLFiles sorts files by:
+// 1. Files without commented refs (by numeric prefix, then alphabetically)
+// 2. Files with commented refs (by numeric prefix, then alphabetically)
+func sortDBMLFiles(files []string) []string {
+	// Create a slice to hold file info for sorting
+	type fileInfo struct {
+		path         string
+		hasCommented bool
+		prefix       int
+		hasPrefix    bool
+		basename     string
+	}
+
+	fileInfos := make([]fileInfo, 0, len(files))
+
+	for _, file := range files {
+		hasCommented, err := hasCommentedRefs(file)
+		if err != nil {
+			// If we can't read the file, treat it as not having commented refs
+			hasCommented = false
+		}
+
+		prefix, hasPrefix := parseFilePrefix(file)
+		basename := filepath.Base(file)
+
+		fileInfos = append(fileInfos, fileInfo{
+			path:         file,
+			hasCommented: hasCommented,
+			prefix:       prefix,
+			hasPrefix:    hasPrefix,
+			basename:     basename,
+		})
+	}
+
+	// Sort by: hasCommented (false first), hasPrefix (true first), prefix, basename
+	sort.Slice(fileInfos, func(i, j int) bool {
+		// First, sort by commented refs (files without commented refs come first)
+		if fileInfos[i].hasCommented != fileInfos[j].hasCommented {
+			return !fileInfos[i].hasCommented
+		}
+
+		// Then by presence of prefix (files with prefix come first)
+		if fileInfos[i].hasPrefix != fileInfos[j].hasPrefix {
+			return fileInfos[i].hasPrefix
+		}
+
+		// If both have prefix, sort by prefix value
+		if fileInfos[i].hasPrefix && fileInfos[j].hasPrefix {
+			if fileInfos[i].prefix != fileInfos[j].prefix {
+				return fileInfos[i].prefix < fileInfos[j].prefix
+			}
+		}
+
+		// Finally, sort alphabetically by basename
+		return fileInfos[i].basename < fileInfos[j].basename
+	})
+
+	// Extract sorted paths
+	sortedFiles := make([]string, len(fileInfos))
+	for i, info := range fileInfos {
+		sortedFiles[i] = info.path
+	}
+
+	return sortedFiles
+}
+
+// mergeTable combines two table definitions
+// Merges: Columns (map), Constraints (map), Indexes (map), Relationships (map)
+// Uses first non-empty Description
+func mergeTable(baseTable, fileTable *models.Table) {
+	// Merge columns (map naturally merges - later keys overwrite)
+	for key, col := range fileTable.Columns {
+		baseTable.Columns[key] = col
+	}
+
+	// Merge constraints
+	for key, constraint := range fileTable.Constraints {
+		baseTable.Constraints[key] = constraint
+	}
+
+	// Merge indexes
+	for key, index := range fileTable.Indexes {
+		baseTable.Indexes[key] = index
+	}
+
+	// Merge relationships
+	for key, rel := range fileTable.Relationships {
+		baseTable.Relationships[key] = rel
+	}
+
+	// Use first non-empty description
+	if baseTable.Description == "" && fileTable.Description != "" {
+		baseTable.Description = fileTable.Description
+	}
+
+	// Merge metadata maps
+	if baseTable.Metadata == nil {
+		baseTable.Metadata = make(map[string]any)
+	}
+	for key, val := range fileTable.Metadata {
+		baseTable.Metadata[key] = val
+	}
+}
+
+// mergeSchema finds or creates schema and merges tables
+func mergeSchema(baseDB *models.Database, fileSchema *models.Schema) {
+	// Find existing schema by name (normalize names by stripping quotes)
+	var existingSchema *models.Schema
+	fileSchemaName := stripQuotes(fileSchema.Name)
+	for _, schema := range baseDB.Schemas {
+		if stripQuotes(schema.Name) == fileSchemaName {
+			existingSchema = schema
+			break
+		}
+	}
+
+	// If schema doesn't exist, add it and return
+	if existingSchema == nil {
+		baseDB.Schemas = append(baseDB.Schemas, fileSchema)
+		return
+	}
+
+	// Merge tables from fileSchema into existingSchema
+	for _, fileTable := range fileSchema.Tables {
+		// Find existing table by name (normalize names by stripping quotes)
+		var existingTable *models.Table
+		fileTableName := stripQuotes(fileTable.Name)
+		for _, table := range existingSchema.Tables {
+			if stripQuotes(table.Name) == fileTableName {
+				existingTable = table
+				break
+			}
+		}
+
+		// If table doesn't exist, add it
+		if existingTable == nil {
+			existingSchema.Tables = append(existingSchema.Tables, fileTable)
+		} else {
+			// Merge table properties - tables are identical, skip
+			mergeTable(existingTable, fileTable)
+		}
+	}
+
+	// Merge other schema properties
+	existingSchema.Views = append(existingSchema.Views, fileSchema.Views...)
+	existingSchema.Sequences = append(existingSchema.Sequences, fileSchema.Sequences...)
+	existingSchema.Scripts = append(existingSchema.Scripts, fileSchema.Scripts...)
+
+	// Merge permissions
+	if existingSchema.Permissions == nil {
+		existingSchema.Permissions = make(map[string]string)
+	}
+	for key, val := range fileSchema.Permissions {
+		existingSchema.Permissions[key] = val
+	}
+
+	// Merge metadata
+	if existingSchema.Metadata == nil {
+		existingSchema.Metadata = make(map[string]any)
+	}
+	for key, val := range fileSchema.Metadata {
+		existingSchema.Metadata[key] = val
+	}
+}
+
+// mergeDatabase merges schemas from fileDB into baseDB
+func mergeDatabase(baseDB, fileDB *models.Database) {
+	// Merge each schema from fileDB
+	for _, fileSchema := range fileDB.Schemas {
+		mergeSchema(baseDB, fileSchema)
+	}
+
+	// Merge domains
+	baseDB.Domains = append(baseDB.Domains, fileDB.Domains...)
+
+	// Use first non-empty description
+	if baseDB.Description == "" && fileDB.Description != "" {
+		baseDB.Description = fileDB.Description
+	}
+}
+
 // parseDBML parses DBML content and returns a Database model
 func (r *Reader) parseDBML(content string) (*models.Database, error) {
 	db := models.InitDatabase("database")
@@ -287,10 +587,10 @@ func (r *Reader) parseColumn(line, tableName, schemaName string) (*models.Column
 					refOp := strings.TrimSpace(refStr)
 					var isReverse bool
 					if strings.HasPrefix(refOp, "<") {
-						isReverse = column.IsPrimaryKey // < on PK means "is referenced by" (reverse)
-					} else if strings.HasPrefix(refOp, ">") {
-						isReverse = !column.IsPrimaryKey // > on FK means reverse
+						// < means "is referenced by" - only makes sense on PK columns
+						isReverse = column.IsPrimaryKey
 					}
+					// > means "references" - always a forward FK, never reverse
 
 					constraint = r.parseRef(refStr)
 					if constraint != nil {
@@ -332,27 +632,31 @@ func (r *Reader) parseIndex(line, tableName, schemaName string) *models.Index {
 	// Format: (columns) [attributes] OR columnname [attributes]
 	var columns []string
 
-	if strings.Contains(line, "(") && strings.Contains(line, ")") {
+	// Find the attributes section to avoid parsing parentheses in notes/attributes
+	attrStart := strings.Index(line, "[")
+	columnPart := line
+	if attrStart > 0 {
+		columnPart = line[:attrStart]
+	}
+
+	if strings.Contains(columnPart, "(") && strings.Contains(columnPart, ")") {
 		// Multi-column format: (col1, col2) [attributes]
-		colStart := strings.Index(line, "(")
-		colEnd := strings.Index(line, ")")
+		colStart := strings.Index(columnPart, "(")
+		colEnd := strings.Index(columnPart, ")")
 		if colStart >= colEnd {
 			return nil
 		}
 
-		columnsStr := line[colStart+1 : colEnd]
+		columnsStr := columnPart[colStart+1 : colEnd]
 		for _, col := range strings.Split(columnsStr, ",") {
 			columns = append(columns, stripQuotes(strings.TrimSpace(col)))
 		}
-	} else if strings.Contains(line, "[") {
+	} else if attrStart > 0 {
 		// Single column format: columnname [attributes]
 		// Extract column name before the bracket
-		idx := strings.Index(line, "[")
-		if idx > 0 {
-			colName := strings.TrimSpace(line[:idx])
-			if colName != "" {
-				columns = []string{stripQuotes(colName)}
-			}
+		colName := strings.TrimSpace(columnPart)
+		if colName != "" {
+			columns = []string{stripQuotes(colName)}
 		}
 	}
 

pkg/readers/dbml/reader_test.go

@@ -1,6 +1,7 @@
 package dbml
 
 import (
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -517,3 +518,286 @@ func TestGetForeignKeys(t *testing.T) {
 		t.Error("Expected foreign key constraint type")
 	}
 }
+
+// Tests for multi-file directory loading
+
+func TestReadDirectory_MultipleFiles(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Should have public schema
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	var publicSchema *models.Schema
+	for _, schema := range db.Schemas {
+		if schema.Name == "public" {
+			publicSchema = schema
+			break
+		}
+	}
+
+	if publicSchema == nil {
+		t.Fatal("Public schema not found")
+	}
+
+	// Should have 3 tables: users, posts, comments
+	if len(publicSchema.Tables) != 3 {
+		t.Fatalf("Expected 3 tables, got %d", len(publicSchema.Tables))
+	}
+
+	// Find tables
+	var usersTable, postsTable, commentsTable *models.Table
+	for _, table := range publicSchema.Tables {
+		switch table.Name {
+		case "users":
+			usersTable = table
+		case "posts":
+			postsTable = table
+		case "comments":
+			commentsTable = table
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+	if postsTable == nil {
+		t.Fatal("Posts table not found")
+	}
+	if commentsTable == nil {
+		t.Fatal("Comments table not found")
+	}
+
+	// Verify users table has merged columns from 1_users.dbml and 3_add_columns.dbml
+	expectedUserColumns := []string{"id", "email", "name", "created_at"}
+	if len(usersTable.Columns) != len(expectedUserColumns) {
+		t.Errorf("Expected %d columns in users table, got %d", len(expectedUserColumns), len(usersTable.Columns))
+	}
+
+	for _, colName := range expectedUserColumns {
+		if _, exists := usersTable.Columns[colName]; !exists {
+			t.Errorf("Expected column '%s' in users table", colName)
+		}
+	}
+
+	// Verify posts table columns
+	expectedPostColumns := []string{"id", "user_id", "title", "content", "created_at"}
+	for _, colName := range expectedPostColumns {
+		if _, exists := postsTable.Columns[colName]; !exists {
+			t.Errorf("Expected column '%s' in posts table", colName)
+		}
+	}
+}
+
+func TestReadDirectory_TableMerging(t *testing.T) {
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	// Find users table
+	var usersTable *models.Table
+	for _, schema := range db.Schemas {
+		for _, table := range schema.Tables {
+			if table.Name == "users" && schema.Name == "public" {
+				usersTable = table
+				break
+			}
+		}
+	}
+
+	if usersTable == nil {
+		t.Fatal("Users table not found")
+	}
+
+	// Verify columns from file 1 (id, email)
+	if _, exists := usersTable.Columns["id"]; !exists {
+		t.Error("Column 'id' from 1_users.dbml not found")
+	}
+	if _, exists := usersTable.Columns["email"]; !exists {
+		t.Error("Column 'email' from 1_users.dbml not found")
+	}
+
+	// Verify columns from file 3 (name, created_at)
+	if _, exists := usersTable.Columns["name"]; !exists {
+		t.Error("Column 'name' from 3_add_columns.dbml not found")
+	}
+	if _, exists := usersTable.Columns["created_at"]; !exists {
+		t.Error("Column 'created_at' from 3_add_columns.dbml not found")
+	}
+
+	// Verify column properties from file 1
+	emailCol := usersTable.Columns["email"]
+	if !emailCol.NotNull {
+		t.Error("Email column should be not null (from 1_users.dbml)")
+	}
+	if emailCol.Type != "varchar(255)" {
+		t.Errorf("Expected email type 'varchar(255)', got '%s'", emailCol.Type)
+	}
+}
+
+func TestReadDirectory_CommentedRefsLast(t *testing.T) {
+	// This test verifies that files with commented refs are processed last
+	// by checking that the file discovery returns them in the correct order
+	dirPath := filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile")
+
+	opts := &readers.ReaderOptions{
+		FilePath: dirPath,
+	}
+
+	reader := NewReader(opts)
+	files, err := reader.discoverDBMLFiles(dirPath)
+	if err != nil {
+		t.Fatalf("discoverDBMLFiles() error = %v", err)
+	}
+
+	if len(files) < 2 {
+		t.Skip("Not enough files to test ordering")
+	}
+
+	// Check that 9_refs.dbml (which has commented refs) comes last
+	lastFile := filepath.Base(files[len(files)-1])
+	if lastFile != "9_refs.dbml" {
+		t.Errorf("Expected last file to be '9_refs.dbml' (has commented refs), got '%s'", lastFile)
+	}
+
+	// Check that numbered files without commented refs come first
+	firstFile := filepath.Base(files[0])
+	if firstFile != "1_users.dbml" {
+		t.Errorf("Expected first file to be '1_users.dbml', got '%s'", firstFile)
+	}
+}
+
+func TestReadDirectory_EmptyDirectory(t *testing.T) {
+	// Create a temporary empty directory
+	tmpDir := filepath.Join("..", "..", "..", "tests", "assets", "dbml", "empty_test_dir")
+	err := os.MkdirAll(tmpDir, 0755)
+	if err != nil {
+		t.Fatalf("Failed to create temp directory: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := &readers.ReaderOptions{
+		FilePath: tmpDir,
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() should not error on empty directory, got: %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	// Empty directory should return empty database
+	if len(db.Schemas) != 0 {
+		t.Errorf("Expected 0 schemas for empty directory, got %d", len(db.Schemas))
+	}
+}
+
+func TestReadDatabase_BackwardCompat(t *testing.T) {
+	// Test that single file loading still works
+	opts := &readers.ReaderOptions{
+		FilePath: filepath.Join("..", "..", "..", "tests", "assets", "dbml", "simple.dbml"),
+	}
+
+	reader := NewReader(opts)
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() error = %v", err)
+	}
+
+	if db == nil {
+		t.Fatal("ReadDatabase() returned nil database")
+	}
+
+	if len(db.Schemas) == 0 {
+		t.Fatal("Expected at least one schema")
+	}
+
+	schema := db.Schemas[0]
+	if len(schema.Tables) != 1 {
+		t.Fatalf("Expected 1 table, got %d", len(schema.Tables))
+	}
+
+	table := schema.Tables[0]
+	if table.Name != "users" {
+		t.Errorf("Expected table name 'users', got '%s'", table.Name)
+	}
+}
+
+func TestParseFilePrefix(t *testing.T) {
+	tests := []struct {
+		filename   string
+		wantPrefix int
+		wantHas    bool
+	}{
+		{"1_schema.dbml", 1, true},
+		{"2_tables.dbml", 2, true},
+		{"10_relationships.dbml", 10, true},
+		{"99_data.dbml", 99, true},
+		{"schema.dbml", 0, false},
+		{"tables_no_prefix.dbml", 0, false},
+		{"/path/to/1_file.dbml", 1, true},
+		{"/path/to/file.dbml", 0, false},
+		{"1-file.dbml", 1, true},
+		{"2-another.dbml", 2, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.filename, func(t *testing.T) {
+			gotPrefix, gotHas := parseFilePrefix(tt.filename)
+			if gotPrefix != tt.wantPrefix {
+				t.Errorf("parseFilePrefix(%s) prefix = %d, want %d", tt.filename, gotPrefix, tt.wantPrefix)
+			}
+			if gotHas != tt.wantHas {
+				t.Errorf("parseFilePrefix(%s) hasPrefix = %v, want %v", tt.filename, gotHas, tt.wantHas)
+			}
+		})
+	}
+}
+
+func TestHasCommentedRefs(t *testing.T) {
+	// Test with the actual multifile test fixtures
+	tests := []struct {
+		filename string
+		wantHas  bool
+	}{
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "1_users.dbml"), false},
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "2_posts.dbml"), false},
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "3_add_columns.dbml"), false},
+		{filepath.Join("..", "..", "..", "tests", "assets", "dbml", "multifile", "9_refs.dbml"), true},
+	}
+
+	for _, tt := range tests {
+		t.Run(filepath.Base(tt.filename), func(t *testing.T) {
+			gotHas, err := hasCommentedRefs(tt.filename)
+			if err != nil {
+				t.Fatalf("hasCommentedRefs() error = %v", err)
+			}
+			if gotHas != tt.wantHas {
+				t.Errorf("hasCommentedRefs(%s) = %v, want %v", filepath.Base(tt.filename), gotHas, tt.wantHas)
+			}
+		})
+	}
+}

pkg/readers/pgsql/reader.go

@@ -329,10 +329,10 @@ func (r *Reader) deriveRelationship(table *models.Table, fk *models.Constraint)
 	relationshipName := fmt.Sprintf("%s_to_%s", table.Name, fk.ReferencedTable)
 
 	relationship := models.InitRelationship(relationshipName, models.OneToMany)
-	relationship.FromTable = fk.ReferencedTable
-	relationship.FromSchema = fk.ReferencedSchema
-	relationship.ToTable = table.Name
-	relationship.ToSchema = table.Schema
+	relationship.FromTable = table.Name
+	relationship.FromSchema = table.Schema
+	relationship.ToTable = fk.ReferencedTable
+	relationship.ToSchema = fk.ReferencedSchema
 	relationship.ForeignKey = fk.Name
 
 	// Store constraint actions in properties

pkg/readers/pgsql/reader_test.go

@@ -328,12 +328,12 @@ func TestDeriveRelationship(t *testing.T) {
 		t.Errorf("Expected relationship type %s, got %s", models.OneToMany, rel.Type)
 	}
 
-	if rel.FromTable != "users" {
-		t.Errorf("Expected FromTable 'users', got '%s'", rel.FromTable)
+	if rel.FromTable != "orders" {
+		t.Errorf("Expected FromTable 'orders', got '%s'", rel.FromTable)
 	}
 
-	if rel.ToTable != "orders" {
-		t.Errorf("Expected ToTable 'orders', got '%s'", rel.ToTable)
+	if rel.ToTable != "users" {
+		t.Errorf("Expected ToTable 'users', got '%s'", rel.ToTable)
 	}
 
 	if rel.ForeignKey != "fk_orders_user_id" {

pkg/writers/bun/template_data.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
 // TemplateData represents the data passed to the template for code generation
@@ -111,13 +112,17 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 		tableName = schema + "." + table.Name
 	}
 
-	// Generate model name: singularize and convert to PascalCase
+	// Generate model name: Model + Schema + Table (all PascalCase)
 	singularTable := Singularize(table.Name)
-	modelName := SnakeCaseToPascalCase(singularTable)
+	tablePart := SnakeCaseToPascalCase(singularTable)
 
-	// Add "Model" prefix if not already present
-	if !hasModelPrefix(modelName) {
-		modelName = "Model" + modelName
+	// Include schema name in model name
+	var modelName string
+	if schema != "" {
+		schemaPart := SnakeCaseToPascalCase(schema)
+		modelName = "Model" + schemaPart + tablePart
+	} else {
+		modelName = "Model" + tablePart
 	}
 
 	model := &ModelData{
@@ -133,8 +138,10 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 	// Find primary key
 	for _, col := range table.Columns {
 		if col.IsPrimaryKey {
-			model.PrimaryKeyField = SnakeCaseToPascalCase(col.Name)
-			model.IDColumnName = col.Name
+			// Sanitize column name to remove backticks
+			safeName := writers.SanitizeStructTagValue(col.Name)
+			model.PrimaryKeyField = SnakeCaseToPascalCase(safeName)
+			model.IDColumnName = safeName
 			// Check if PK type is a SQL type (contains resolvespec_common or sql_types)
 			goType := typeMapper.SQLTypeToGoType(col.Type, col.NotNull)
 			model.PrimaryKeyIsSQL = strings.Contains(goType, "resolvespec_common") || strings.Contains(goType, "sql_types")
@@ -146,6 +153,8 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 	columns := sortColumns(table.Columns)
 	for _, col := range columns {
 		field := columnToField(col, table, typeMapper)
+		// Check for name collision with generated methods and rename if needed
+		field.Name = resolveFieldNameCollision(field.Name)
 		model.Fields = append(model.Fields, field)
 	}
 
@@ -154,10 +163,13 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 
 // columnToField converts a models.Column to FieldData
 func columnToField(col *models.Column, table *models.Table, typeMapper *TypeMapper) *FieldData {
-	fieldName := SnakeCaseToPascalCase(col.Name)
+	// Sanitize column name first to remove backticks before generating field name
+	safeName := writers.SanitizeStructTagValue(col.Name)
+	fieldName := SnakeCaseToPascalCase(safeName)
 	goType := typeMapper.SQLTypeToGoType(col.Type, col.NotNull)
 	bunTag := typeMapper.BuildBunTag(col, table)
-	jsonTag := col.Name // Use column name for JSON tag
+	// Use same sanitized name for JSON tag
+	jsonTag := safeName
 
 	return &FieldData{
 		Name:    fieldName,
@@ -184,9 +196,28 @@ func formatComment(description, comment string) string {
 	return comment
 }
 
-// hasModelPrefix checks if a name already has "Model" prefix
-func hasModelPrefix(name string) bool {
-	return len(name) >= 5 && name[:5] == "Model"
+// resolveFieldNameCollision checks if a field name conflicts with generated method names
+// and adds an underscore suffix if there's a collision
+func resolveFieldNameCollision(fieldName string) string {
+	// List of method names that are generated by the template
+	reservedNames := map[string]bool{
+		"TableName":     true,
+		"TableNameOnly": true,
+		"SchemaName":    true,
+		"GetID":         true,
+		"GetIDStr":      true,
+		"SetID":         true,
+		"UpdateID":      true,
+		"GetIDName":     true,
+		"GetPrefix":     true,
+	}
+
+	// Check if field name conflicts with a reserved method name
+	if reservedNames[fieldName] {
+		return fieldName + "_"
+	}
+
+	return fieldName
 }
 
 // sortColumns sorts columns by sequence, then by name

pkg/writers/bun/type_mapper.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
 // TypeMapper handles type conversions between SQL and Go types for Bun
@@ -164,11 +165,14 @@ func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) st
 	var parts []string
 
 	// Column name comes first (no prefix)
-	parts = append(parts, column.Name)
+	// Sanitize to remove backticks which would break struct tag syntax
+	safeName := writers.SanitizeStructTagValue(column.Name)
+	parts = append(parts, safeName)
 
 	// Add type if specified
 	if column.Type != "" {
-		typeStr := column.Type
+		// Sanitize type to remove backticks
+		typeStr := writers.SanitizeStructTagValue(column.Type)
 		if column.Length > 0 {
 			typeStr = fmt.Sprintf("%s(%d)", typeStr, column.Length)
 		} else if column.Precision > 0 {
@@ -188,12 +192,17 @@ func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) st
 
 	// Default value
 	if column.Default != nil {
-		parts = append(parts, fmt.Sprintf("default:%v", column.Default))
+		// Sanitize default value to remove backticks
+		safeDefault := writers.SanitizeStructTagValue(fmt.Sprintf("%v", column.Default))
+		parts = append(parts, fmt.Sprintf("default:%s", safeDefault))
 	}
 
 	// Nullable (Bun uses nullzero for nullable fields)
+	// and notnull tag for explicitly non-nullable fields
 	if !column.NotNull && !column.IsPrimaryKey {
 		parts = append(parts, "nullzero")
+	} else if column.NotNull && !column.IsPrimaryKey {
+		parts = append(parts, "notnull")
 	}
 
 	// Check for indexes (unique indexes should be added to tag)
@@ -260,7 +269,7 @@ func (tm *TypeMapper) NeedsFmtImport(generateGetIDStr bool) bool {
 
 // GetSQLTypesImport returns the import path for sql_types (ResolveSpec common)
 func (tm *TypeMapper) GetSQLTypesImport() string {
-	return "github.com/bitechdev/ResolveSpec/pkg/common"
+	return "github.com/bitechdev/ResolveSpec/pkg/spectypes"
 }
 
 // GetBunImport returns the import path for Bun

pkg/writers/bun/writer.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"go/format"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 
@@ -124,7 +125,16 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 	}
 
 	// Write output
-	return w.writeOutput(formatted)
+	if err := w.writeOutput(formatted); err != nil {
+		return err
+	}
+
+	// Run go fmt on the output file
+	if w.options.OutputPath != "" {
+		w.runGoFmt(w.options.OutputPath)
+	}
+
+	return nil
 }
 
 // writeMultiFile writes each table to a separate file
@@ -207,13 +217,19 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 			}
 
 			// Generate filename: sql_{schema}_{table}.go
-			filename := fmt.Sprintf("sql_%s_%s.go", schema.Name, table.Name)
+			// Sanitize schema and table names to remove quotes, comments, and invalid characters
+			safeSchemaName := writers.SanitizeFilename(schema.Name)
+			safeTableName := writers.SanitizeFilename(table.Name)
+			filename := fmt.Sprintf("sql_%s_%s.go", safeSchemaName, safeTableName)
 			filepath := filepath.Join(w.options.OutputPath, filename)
 
 			// Write file
 			if err := os.WriteFile(filepath, []byte(formatted), 0644); err != nil {
 				return fmt.Errorf("failed to write file %s: %w", filename, err)
 			}
+
+			// Run go fmt on the generated file
+			w.runGoFmt(filepath)
 		}
 	}
 
@@ -222,6 +238,9 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 
 // addRelationshipFields adds relationship fields to the model based on foreign keys
 func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table, schema *models.Schema, db *models.Database) {
+	// Track used field names to detect duplicates
+	usedFieldNames := make(map[string]int)
+
 	// For each foreign key in this table, add a belongs-to/has-one relationship
 	for _, constraint := range table.Constraints {
 		if constraint.Type != models.ForeignKeyConstraint {
@@ -235,8 +254,9 @@ func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table
 		}
 
 		// Create relationship field (has-one in Bun, similar to belongs-to in GORM)
-		refModelName := w.getModelName(constraint.ReferencedTable)
-		fieldName := w.generateRelationshipFieldName(constraint.ReferencedTable)
+		refModelName := w.getModelName(constraint.ReferencedSchema, constraint.ReferencedTable)
+		fieldName := w.generateHasOneFieldName(constraint)
+		fieldName = w.ensureUniqueFieldName(fieldName, usedFieldNames)
 		relationTag := w.typeMapper.BuildRelationshipTag(constraint, "has-one")
 
 		modelData.AddRelationshipField(&FieldData{
@@ -263,8 +283,9 @@ func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table
 				// Check if this constraint references our table
 				if constraint.ReferencedTable == table.Name && constraint.ReferencedSchema == schema.Name {
 					// Add has-many relationship
-					otherModelName := w.getModelName(otherTable.Name)
-					fieldName := w.generateRelationshipFieldName(otherTable.Name) + "s" // Pluralize
+					otherModelName := w.getModelName(otherSchema.Name, otherTable.Name)
+					fieldName := w.generateHasManyFieldName(constraint, otherSchema.Name, otherTable.Name)
+					fieldName = w.ensureUniqueFieldName(fieldName, usedFieldNames)
 					relationTag := w.typeMapper.BuildRelationshipTag(constraint, "has-many")
 
 					modelData.AddRelationshipField(&FieldData{
@@ -295,22 +316,77 @@ func (w *Writer) findTable(schemaName, tableName string, db *models.Database) *m
 	return nil
 }
 
-// getModelName generates the model name from a table name
-func (w *Writer) getModelName(tableName string) string {
+// getModelName generates the model name from schema and table name
+func (w *Writer) getModelName(schemaName, tableName string) string {
 	singular := Singularize(tableName)
-	modelName := SnakeCaseToPascalCase(singular)
+	tablePart := SnakeCaseToPascalCase(singular)
 
-	if !hasModelPrefix(modelName) {
-		modelName = "Model" + modelName
+	// Include schema name in model name
+	var modelName string
+	if schemaName != "" {
+		schemaPart := SnakeCaseToPascalCase(schemaName)
+		modelName = "Model" + schemaPart + tablePart
+	} else {
+		modelName = "Model" + tablePart
 	}
 
 	return modelName
 }
 
-// generateRelationshipFieldName generates a field name for a relationship
-func (w *Writer) generateRelationshipFieldName(tableName string) string {
-	// Use just the prefix (3 letters) for relationship fields
-	return GeneratePrefix(tableName)
+// generateHasOneFieldName generates a field name for has-one relationships
+// Uses the foreign key column name for uniqueness
+func (w *Writer) generateHasOneFieldName(constraint *models.Constraint) string {
+	// Use the foreign key column name to ensure uniqueness
+	// If there are multiple columns, use the first one
+	if len(constraint.Columns) > 0 {
+		columnName := constraint.Columns[0]
+		// Convert to PascalCase for proper Go field naming
+		// e.g., "rid_filepointer_request" -> "RelRIDFilepointerRequest"
+		return "Rel" + SnakeCaseToPascalCase(columnName)
+	}
+
+	// Fallback to table-based prefix if no columns defined
+	return "Rel" + GeneratePrefix(constraint.ReferencedTable)
+}
+
+// generateHasManyFieldName generates a field name for has-many relationships
+// Uses the foreign key column name + source table name to avoid duplicates
+func (w *Writer) generateHasManyFieldName(constraint *models.Constraint, sourceSchemaName, sourceTableName string) string {
+	// For has-many, we need to include the source table name to avoid duplicates
+	// e.g., multiple tables referencing the same column on this table
+	if len(constraint.Columns) > 0 {
+		columnName := constraint.Columns[0]
+		// Get the model name for the source table (pluralized)
+		sourceModelName := w.getModelName(sourceSchemaName, sourceTableName)
+		// Remove "Model" prefix if present
+		sourceModelName = strings.TrimPrefix(sourceModelName, "Model")
+
+		// Convert column to PascalCase and combine with source table
+		// e.g., "rid_api_provider" + "Login" -> "RelRIDAPIProviderLogins"
+		columnPart := SnakeCaseToPascalCase(columnName)
+		return "Rel" + columnPart + Pluralize(sourceModelName)
+	}
+
+	// Fallback to table-based naming
+	sourceModelName := w.getModelName(sourceSchemaName, sourceTableName)
+	sourceModelName = strings.TrimPrefix(sourceModelName, "Model")
+	return "Rel" + Pluralize(sourceModelName)
+}
+
+// ensureUniqueFieldName ensures a field name is unique by adding numeric suffixes if needed
+func (w *Writer) ensureUniqueFieldName(fieldName string, usedNames map[string]int) string {
+	originalName := fieldName
+	count := usedNames[originalName]
+
+	if count > 0 {
+		// Name is already used, add numeric suffix
+		fieldName = fmt.Sprintf("%s%d", originalName, count+1)
+	}
+
+	// Increment the counter for this base name
+	usedNames[originalName]++
+
+	return fieldName
 }
 
 // getPackageName returns the package name from options or defaults to "models"
@@ -341,6 +417,15 @@ func (w *Writer) writeOutput(content string) error {
 	return nil
 }
 
+// runGoFmt runs go fmt on the specified file
+func (w *Writer) runGoFmt(filepath string) {
+	cmd := exec.Command("gofmt", "-w", filepath)
+	if err := cmd.Run(); err != nil {
+		// Don't fail the whole operation if gofmt fails, just warn
+		fmt.Fprintf(os.Stderr, "Warning: failed to run gofmt on %s: %v\n", filepath, err)
+	}
+}
+
 // shouldUseMultiFile determines whether to use multi-file mode based on metadata or output path
 func (w *Writer) shouldUseMultiFile() bool {
 	// Check if multi_file is explicitly set in metadata

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 ModelUser struct",
+		"type ModelPublicUser 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 ModelUser) TableName() string",
+		"func (m ModelPublicUser) TableName() string",
 		"return \"public.users\"",
-		"func (m ModelUser) GetID() int64",
+		"func (m ModelPublicUser) GetID() int64",
 	}
 
 	for _, expected := range expectations {
@@ -175,12 +175,378 @@ func TestWriter_WriteDatabase_MultiFile(t *testing.T) {
 	postsStr := string(postsContent)
 
 	// Verify relationship is present with Bun format
-	if !strings.Contains(postsStr, "USE") {
-		t.Errorf("Missing relationship field USE")
+	// Should now be RelUserID (has-one) instead of USE
+	if !strings.Contains(postsStr, "RelUserID") {
+		t.Errorf("Missing relationship field RelUserID (new naming convention)")
 	}
 	if !strings.Contains(postsStr, "rel:has-one") {
 		t.Errorf("Missing Bun relationship tag: %s", postsStr)
 	}
+
+	// Check users file contains has-many relationship
+	usersContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_public_users.go"))
+	if err != nil {
+		t.Fatalf("Failed to read users file: %v", err)
+	}
+
+	usersStr := string(usersContent)
+
+	// Should have RelUserIDPublicPosts (has-many) field - includes schema prefix
+	if !strings.Contains(usersStr, "RelUserIDPublicPosts") {
+		t.Errorf("Missing has-many relationship field RelUserIDPublicPosts")
+	}
+}
+
+func TestWriter_MultipleReferencesToSameTable(t *testing.T) {
+	// Test scenario: api_event table with multiple foreign keys to filepointer table
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("org")
+
+	// Filepointer table
+	filepointer := models.InitTable("filepointer", "org")
+	filepointer.Columns["id_filepointer"] = &models.Column{
+		Name:         "id_filepointer",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	schema.Tables = append(schema.Tables, filepointer)
+
+	// API event table with two foreign keys to filepointer
+	apiEvent := models.InitTable("api_event", "org")
+	apiEvent.Columns["id_api_event"] = &models.Column{
+		Name:         "id_api_event",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	apiEvent.Columns["rid_filepointer_request"] = &models.Column{
+		Name:    "rid_filepointer_request",
+		Type:    "bigint",
+		NotNull: false,
+	}
+	apiEvent.Columns["rid_filepointer_response"] = &models.Column{
+		Name:    "rid_filepointer_response",
+		Type:    "bigint",
+		NotNull: false,
+	}
+
+	// Add constraints
+	apiEvent.Constraints["fk_request"] = &models.Constraint{
+		Name:              "fk_request",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_filepointer_request"},
+		ReferencedTable:   "filepointer",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_filepointer"},
+	}
+	apiEvent.Constraints["fk_response"] = &models.Constraint{
+		Name:              "fk_response",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_filepointer_response"},
+		ReferencedTable:   "filepointer",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_filepointer"},
+	}
+
+	schema.Tables = append(schema.Tables, apiEvent)
+	db.Schemas = append(db.Schemas, schema)
+
+	// Create writer
+	tmpDir := t.TempDir()
+	opts := &writers.WriterOptions{
+		PackageName: "models",
+		OutputPath:  tmpDir,
+		Metadata: map[string]interface{}{
+			"multi_file": true,
+		},
+	}
+
+	writer := NewWriter(opts)
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	// Read the api_event file
+	apiEventContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_org_api_event.go"))
+	if err != nil {
+		t.Fatalf("Failed to read api_event file: %v", err)
+	}
+
+	contentStr := string(apiEventContent)
+
+	// Verify both relationships have unique names based on column names
+	expectations := []struct {
+		fieldName string
+		tag       string
+	}{
+		{"RelRIDFilepointerRequest", "join:rid_filepointer_request=id_filepointer"},
+		{"RelRIDFilepointerResponse", "join:rid_filepointer_response=id_filepointer"},
+	}
+
+	for _, exp := range expectations {
+		if !strings.Contains(contentStr, exp.fieldName) {
+			t.Errorf("Missing relationship field: %s\nGenerated:\n%s", exp.fieldName, contentStr)
+		}
+		if !strings.Contains(contentStr, exp.tag) {
+			t.Errorf("Missing relationship tag: %s\nGenerated:\n%s", exp.tag, contentStr)
+		}
+	}
+
+	// Verify NO duplicate field names (old behavior would create duplicate "FIL" fields)
+	if strings.Contains(contentStr, "FIL *ModelFilepointer") {
+		t.Errorf("Found old prefix-based naming (FIL), should use column-based naming")
+	}
+
+	// Also verify has-many relationships on filepointer table
+	filepointerContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_org_filepointer.go"))
+	if err != nil {
+		t.Fatalf("Failed to read filepointer file: %v", err)
+	}
+
+	filepointerStr := string(filepointerContent)
+
+	// Should have two different has-many relationships with unique names
+	hasManyExpectations := []string{
+		"RelRIDFilepointerRequestOrgAPIEvents",  // Has many via rid_filepointer_request
+		"RelRIDFilepointerResponseOrgAPIEvents", // Has many via rid_filepointer_response
+	}
+
+	for _, exp := range hasManyExpectations {
+		if !strings.Contains(filepointerStr, exp) {
+			t.Errorf("Missing has-many relationship field: %s\nGenerated:\n%s", exp, filepointerStr)
+		}
+	}
+}
+
+func TestWriter_MultipleHasManyRelationships(t *testing.T) {
+	// Test scenario: api_provider table referenced by multiple tables via rid_api_provider
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("org")
+
+	// Owner table
+	owner := models.InitTable("owner", "org")
+	owner.Columns["id_owner"] = &models.Column{
+		Name:         "id_owner",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	schema.Tables = append(schema.Tables, owner)
+
+	// API Provider table
+	apiProvider := models.InitTable("api_provider", "org")
+	apiProvider.Columns["id_api_provider"] = &models.Column{
+		Name:         "id_api_provider",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	apiProvider.Columns["rid_owner"] = &models.Column{
+		Name:    "rid_owner",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	apiProvider.Constraints["fk_owner"] = &models.Constraint{
+		Name:              "fk_owner",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_owner"},
+		ReferencedTable:   "owner",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_owner"},
+	}
+	schema.Tables = append(schema.Tables, apiProvider)
+
+	// Login table
+	login := models.InitTable("login", "org")
+	login.Columns["id_login"] = &models.Column{
+		Name:         "id_login",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	login.Columns["rid_api_provider"] = &models.Column{
+		Name:    "rid_api_provider",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	login.Constraints["fk_api_provider"] = &models.Constraint{
+		Name:              "fk_api_provider",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_api_provider"},
+		ReferencedTable:   "api_provider",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_api_provider"},
+	}
+	schema.Tables = append(schema.Tables, login)
+
+	// Filepointer table
+	filepointer := models.InitTable("filepointer", "org")
+	filepointer.Columns["id_filepointer"] = &models.Column{
+		Name:         "id_filepointer",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	filepointer.Columns["rid_api_provider"] = &models.Column{
+		Name:    "rid_api_provider",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	filepointer.Constraints["fk_api_provider"] = &models.Constraint{
+		Name:              "fk_api_provider",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_api_provider"},
+		ReferencedTable:   "api_provider",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_api_provider"},
+	}
+	schema.Tables = append(schema.Tables, filepointer)
+
+	// API Event table
+	apiEvent := models.InitTable("api_event", "org")
+	apiEvent.Columns["id_api_event"] = &models.Column{
+		Name:         "id_api_event",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	apiEvent.Columns["rid_api_provider"] = &models.Column{
+		Name:    "rid_api_provider",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	apiEvent.Constraints["fk_api_provider"] = &models.Constraint{
+		Name:              "fk_api_provider",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_api_provider"},
+		ReferencedTable:   "api_provider",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_api_provider"},
+	}
+	schema.Tables = append(schema.Tables, apiEvent)
+
+	db.Schemas = append(db.Schemas, schema)
+
+	// Create writer
+	tmpDir := t.TempDir()
+	opts := &writers.WriterOptions{
+		PackageName: "models",
+		OutputPath:  tmpDir,
+		Metadata: map[string]interface{}{
+			"multi_file": true,
+		},
+	}
+
+	writer := NewWriter(opts)
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	// Read the api_provider file
+	apiProviderContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_org_api_provider.go"))
+	if err != nil {
+		t.Fatalf("Failed to read api_provider file: %v", err)
+	}
+
+	contentStr := string(apiProviderContent)
+
+	// Verify all has-many relationships have unique names
+	hasManyExpectations := []string{
+		"RelRIDAPIProviderOrgLogins",      // Has many via Login
+		"RelRIDAPIProviderOrgFilepointers", // Has many via Filepointer
+		"RelRIDAPIProviderOrgAPIEvents",   // Has many via APIEvent
+		"RelRIDOwner",                     // Has one via rid_owner
+	}
+
+	for _, exp := range hasManyExpectations {
+		if !strings.Contains(contentStr, exp) {
+			t.Errorf("Missing relationship field: %s\nGenerated:\n%s", exp, contentStr)
+		}
+	}
+
+	// Verify NO duplicate field names
+	// Count occurrences of "RelRIDAPIProvider" fields - should have 3 unique ones
+	count := strings.Count(contentStr, "RelRIDAPIProvider")
+	if count != 3 {
+		t.Errorf("Expected 3 RelRIDAPIProvider* fields, found %d\nGenerated:\n%s", count, contentStr)
+	}
+
+	// Verify no duplicate declarations (would cause compilation error)
+	duplicatePattern := "RelRIDAPIProviders []*Model"
+	if strings.Contains(contentStr, duplicatePattern) {
+		t.Errorf("Found duplicate field declaration pattern, fields should be unique")
+	}
+}
+
+func TestWriter_FieldNameCollision(t *testing.T) {
+	// Test scenario: table with columns that would conflict with generated method names
+	table := models.InitTable("audit_table", "audit")
+	table.Columns["id_audit_table"] = &models.Column{
+		Name:         "id_audit_table",
+		Type:         "smallint",
+		NotNull:      true,
+		IsPrimaryKey: true,
+		Sequence:     1,
+	}
+	table.Columns["table_name"] = &models.Column{
+		Name:     "table_name",
+		Type:     "varchar",
+		Length:   100,
+		NotNull:  true,
+		Sequence: 2,
+	}
+	table.Columns["table_schema"] = &models.Column{
+		Name:     "table_schema",
+		Type:     "varchar",
+		Length:   100,
+		NotNull:  true,
+		Sequence: 3,
+	}
+
+	// Create writer
+	tmpDir := t.TempDir()
+	opts := &writers.WriterOptions{
+		PackageName: "models",
+		OutputPath:  filepath.Join(tmpDir, "test.go"),
+	}
+
+	writer := NewWriter(opts)
+
+	err := writer.WriteTable(table)
+	if err != nil {
+		t.Fatalf("WriteTable failed: %v", err)
+	}
+
+	// Read the generated file
+	content, err := os.ReadFile(opts.OutputPath)
+	if err != nil {
+		t.Fatalf("Failed to read generated file: %v", err)
+	}
+
+	generated := string(content)
+
+	// Verify that TableName field was renamed to TableName_ to avoid collision
+	if !strings.Contains(generated, "TableName_") {
+		t.Errorf("Expected field 'TableName_' (with underscore) but not found\nGenerated:\n%s", generated)
+	}
+
+	// Verify the struct tag still references the correct database column
+	if !strings.Contains(generated, `bun:"table_name,`) {
+		t.Errorf("Expected bun tag to reference 'table_name' column\nGenerated:\n%s", generated)
+	}
+
+	// Verify the TableName() method still exists and doesn't conflict
+	if !strings.Contains(generated, "func (m ModelAuditAuditTable) TableName() string") {
+		t.Errorf("TableName() method should still be generated\nGenerated:\n%s", generated)
+	}
+
+	// Verify NO field named just "TableName" (without underscore)
+	if strings.Contains(generated, "TableName resolvespec_common") || strings.Contains(generated, "TableName string") {
+		t.Errorf("Field 'TableName' without underscore should not exist (would conflict with method)\nGenerated:\n%s", generated)
+	}
 }
 
 func TestTypeMapper_SQLTypeToGoType_Bun(t *testing.T) {

pkg/writers/dbml/writer.go

@@ -126,7 +126,15 @@ func (w *Writer) tableToDBML(t *models.Table) string {
 			attrs = append(attrs, "increment")
 		}
 		if column.Default != nil {
-			attrs = append(attrs, fmt.Sprintf("default: `%v`", column.Default))
+			// Check if default value contains backticks (DBML expressions like `now()`)
+			defaultStr := fmt.Sprintf("%v", column.Default)
+			if strings.HasPrefix(defaultStr, "`") && strings.HasSuffix(defaultStr, "`") {
+				// Already an expression with backticks, use as-is
+				attrs = append(attrs, fmt.Sprintf("default: %s", defaultStr))
+			} else {
+				// Regular value, wrap in single quotes
+				attrs = append(attrs, fmt.Sprintf("default: '%v'", column.Default))
+			}
 		}
 
 		if len(attrs) > 0 {

pkg/writers/drizzle/writer.go

@@ -196,7 +196,9 @@ func (w *Writer) writeTableFile(table *models.Table, schema *models.Schema, db *
 	}
 
 	// Generate filename: {tableName}.ts
-	filename := filepath.Join(w.options.OutputPath, table.Name+".ts")
+	// Sanitize table name to remove quotes, comments, and invalid characters
+	safeTableName := writers.SanitizeFilename(table.Name)
+	filename := filepath.Join(w.options.OutputPath, safeTableName+".ts")
 	return os.WriteFile(filename, []byte(code), 0644)
 }
 

pkg/writers/gorm/template_data.go

@@ -4,6 +4,7 @@ import (
 	"sort"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
 // TemplateData represents the data passed to the template for code generation
@@ -24,6 +25,7 @@ type ModelData struct {
 	Fields          []*FieldData
 	Config          *MethodConfig
 	PrimaryKeyField string // Name of the primary key field
+	PrimaryKeyType  string // Go type of the primary key field
 	IDColumnName    string // Name of the ID column in database
 	Prefix          string // 3-letter prefix
 }
@@ -109,13 +111,17 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 		tableName = schema + "." + table.Name
 	}
 
-	// Generate model name: singularize and convert to PascalCase
+	// Generate model name: Model + Schema + Table (all PascalCase)
 	singularTable := Singularize(table.Name)
-	modelName := SnakeCaseToPascalCase(singularTable)
+	tablePart := SnakeCaseToPascalCase(singularTable)
 
-	// Add "Model" prefix if not already present
-	if !hasModelPrefix(modelName) {
-		modelName = "Model" + modelName
+	// Include schema name in model name
+	var modelName string
+	if schema != "" {
+		schemaPart := SnakeCaseToPascalCase(schema)
+		modelName = "Model" + schemaPart + tablePart
+	} else {
+		modelName = "Model" + tablePart
 	}
 
 	model := &ModelData{
@@ -131,8 +137,11 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 	// Find primary key
 	for _, col := range table.Columns {
 		if col.IsPrimaryKey {
-			model.PrimaryKeyField = SnakeCaseToPascalCase(col.Name)
-			model.IDColumnName = col.Name
+			// Sanitize column name to remove backticks
+			safeName := writers.SanitizeStructTagValue(col.Name)
+			model.PrimaryKeyField = SnakeCaseToPascalCase(safeName)
+			model.PrimaryKeyType = typeMapper.SQLTypeToGoType(col.Type, col.NotNull)
+			model.IDColumnName = safeName
 			break
 		}
 	}
@@ -141,6 +150,8 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 	columns := sortColumns(table.Columns)
 	for _, col := range columns {
 		field := columnToField(col, table, typeMapper)
+		// Check for name collision with generated methods and rename if needed
+		field.Name = resolveFieldNameCollision(field.Name)
 		model.Fields = append(model.Fields, field)
 	}
 
@@ -149,10 +160,13 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper) *M
 
 // columnToField converts a models.Column to FieldData
 func columnToField(col *models.Column, table *models.Table, typeMapper *TypeMapper) *FieldData {
-	fieldName := SnakeCaseToPascalCase(col.Name)
+	// Sanitize column name first to remove backticks before generating field name
+	safeName := writers.SanitizeStructTagValue(col.Name)
+	fieldName := SnakeCaseToPascalCase(safeName)
 	goType := typeMapper.SQLTypeToGoType(col.Type, col.NotNull)
 	gormTag := typeMapper.BuildGormTag(col, table)
-	jsonTag := col.Name // Use column name for JSON tag
+	// Use same sanitized name for JSON tag
+	jsonTag := safeName
 
 	return &FieldData{
 		Name:    fieldName,
@@ -179,9 +193,28 @@ func formatComment(description, comment string) string {
 	return comment
 }
 
-// hasModelPrefix checks if a name already has "Model" prefix
-func hasModelPrefix(name string) bool {
-	return len(name) >= 5 && name[:5] == "Model"
+// resolveFieldNameCollision checks if a field name conflicts with generated method names
+// and adds an underscore suffix if there's a collision
+func resolveFieldNameCollision(fieldName string) string {
+	// List of method names that are generated by the template
+	reservedNames := map[string]bool{
+		"TableName":     true,
+		"TableNameOnly": true,
+		"SchemaName":    true,
+		"GetID":         true,
+		"GetIDStr":      true,
+		"SetID":         true,
+		"UpdateID":      true,
+		"GetIDName":     true,
+		"GetPrefix":     true,
+	}
+
+	// Check if field name conflicts with a reserved method name
+	if reservedNames[fieldName] {
+		return fieldName + "_"
+	}
+
+	return fieldName
 }
 
 // sortColumns sorts columns by sequence, then by name

pkg/writers/gorm/templates.go

@@ -62,7 +62,7 @@ func (m {{.Name}}) SetID(newid int64) {
 {{if and .Config.GenerateUpdateID .PrimaryKeyField}}
 // UpdateID updates the primary key value
 func (m *{{.Name}}) UpdateID(newid int64) {
-	m.{{.PrimaryKeyField}} = int32(newid)
+	m.{{.PrimaryKeyField}} = {{.PrimaryKeyType}}(newid)
 }
 {{end}}
 {{if and .Config.GenerateGetIDName .IDColumnName}}

pkg/writers/gorm/type_mapper.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
 // TypeMapper handles type conversions between SQL and Go types
@@ -199,12 +200,15 @@ func (tm *TypeMapper) BuildGormTag(column *models.Column, table *models.Table) s
 	var parts []string
 
 	// Always include column name (lowercase as per user requirement)
-	parts = append(parts, fmt.Sprintf("column:%s", column.Name))
+	// Sanitize to remove backticks which would break struct tag syntax
+	safeName := writers.SanitizeStructTagValue(column.Name)
+	parts = append(parts, fmt.Sprintf("column:%s", safeName))
 
 	// Add type if specified
 	if column.Type != "" {
 		// Include length, precision, scale if present
-		typeStr := column.Type
+		// Sanitize type to remove backticks
+		typeStr := writers.SanitizeStructTagValue(column.Type)
 		if column.Length > 0 {
 			typeStr = fmt.Sprintf("%s(%d)", typeStr, column.Length)
 		} else if column.Precision > 0 {
@@ -234,7 +238,9 @@ func (tm *TypeMapper) BuildGormTag(column *models.Column, table *models.Table) s
 
 	// Default value
 	if column.Default != nil {
-		parts = append(parts, fmt.Sprintf("default:%v", column.Default))
+		// Sanitize default value to remove backticks
+		safeDefault := writers.SanitizeStructTagValue(fmt.Sprintf("%v", column.Default))
+		parts = append(parts, fmt.Sprintf("default:%s", safeDefault))
 	}
 
 	// Check for unique constraint
@@ -331,5 +337,5 @@ func (tm *TypeMapper) NeedsFmtImport(generateGetIDStr bool) bool {
 
 // GetSQLTypesImport returns the import path for sql_types
 func (tm *TypeMapper) GetSQLTypesImport() string {
-	return "github.com/bitechdev/ResolveSpec/pkg/common/sql_types"
+	return "github.com/bitechdev/ResolveSpec/pkg/spectypes"
 }

pkg/writers/gorm/writer.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"go/format"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 
@@ -121,7 +122,16 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 	}
 
 	// Write output
-	return w.writeOutput(formatted)
+	if err := w.writeOutput(formatted); err != nil {
+		return err
+	}
+
+	// Run go fmt on the output file
+	if w.options.OutputPath != "" {
+		w.runGoFmt(w.options.OutputPath)
+	}
+
+	return nil
 }
 
 // writeMultiFile writes each table to a separate file
@@ -201,13 +211,19 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 			}
 
 			// Generate filename: sql_{schema}_{table}.go
-			filename := fmt.Sprintf("sql_%s_%s.go", schema.Name, table.Name)
+			// Sanitize schema and table names to remove quotes, comments, and invalid characters
+			safeSchemaName := writers.SanitizeFilename(schema.Name)
+			safeTableName := writers.SanitizeFilename(table.Name)
+			filename := fmt.Sprintf("sql_%s_%s.go", safeSchemaName, safeTableName)
 			filepath := filepath.Join(w.options.OutputPath, filename)
 
 			// Write file
 			if err := os.WriteFile(filepath, []byte(formatted), 0644); err != nil {
 				return fmt.Errorf("failed to write file %s: %w", filename, err)
 			}
+
+			// Run go fmt on the generated file
+			w.runGoFmt(filepath)
 		}
 	}
 
@@ -216,6 +232,9 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 
 // addRelationshipFields adds relationship fields to the model based on foreign keys
 func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table, schema *models.Schema, db *models.Database) {
+	// Track used field names to detect duplicates
+	usedFieldNames := make(map[string]int)
+
 	// For each foreign key in this table, add a belongs-to relationship
 	for _, constraint := range table.Constraints {
 		if constraint.Type != models.ForeignKeyConstraint {
@@ -229,8 +248,9 @@ func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table
 		}
 
 		// Create relationship field (belongs-to)
-		refModelName := w.getModelName(constraint.ReferencedTable)
-		fieldName := w.generateRelationshipFieldName(constraint.ReferencedTable)
+		refModelName := w.getModelName(constraint.ReferencedSchema, constraint.ReferencedTable)
+		fieldName := w.generateBelongsToFieldName(constraint)
+		fieldName = w.ensureUniqueFieldName(fieldName, usedFieldNames)
 		relationTag := w.typeMapper.BuildRelationshipTag(constraint, false)
 
 		modelData.AddRelationshipField(&FieldData{
@@ -257,8 +277,9 @@ func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table
 				// Check if this constraint references our table
 				if constraint.ReferencedTable == table.Name && constraint.ReferencedSchema == schema.Name {
 					// Add has-many relationship
-					otherModelName := w.getModelName(otherTable.Name)
-					fieldName := w.generateRelationshipFieldName(otherTable.Name) + "s" // Pluralize
+					otherModelName := w.getModelName(otherSchema.Name, otherTable.Name)
+					fieldName := w.generateHasManyFieldName(constraint, otherSchema.Name, otherTable.Name)
+					fieldName = w.ensureUniqueFieldName(fieldName, usedFieldNames)
 					relationTag := w.typeMapper.BuildRelationshipTag(constraint, true)
 
 					modelData.AddRelationshipField(&FieldData{
@@ -289,22 +310,77 @@ func (w *Writer) findTable(schemaName, tableName string, db *models.Database) *m
 	return nil
 }
 
-// getModelName generates the model name from a table name
-func (w *Writer) getModelName(tableName string) string {
+// getModelName generates the model name from schema and table name
+func (w *Writer) getModelName(schemaName, tableName string) string {
 	singular := Singularize(tableName)
-	modelName := SnakeCaseToPascalCase(singular)
+	tablePart := SnakeCaseToPascalCase(singular)
 
-	if !hasModelPrefix(modelName) {
-		modelName = "Model" + modelName
+	// Include schema name in model name
+	var modelName string
+	if schemaName != "" {
+		schemaPart := SnakeCaseToPascalCase(schemaName)
+		modelName = "Model" + schemaPart + tablePart
+	} else {
+		modelName = "Model" + tablePart
 	}
 
 	return modelName
 }
 
-// generateRelationshipFieldName generates a field name for a relationship
-func (w *Writer) generateRelationshipFieldName(tableName string) string {
-	// Use just the prefix (3 letters) for relationship fields
-	return GeneratePrefix(tableName)
+// generateBelongsToFieldName generates a field name for belongs-to relationships
+// Uses the foreign key column name for uniqueness
+func (w *Writer) generateBelongsToFieldName(constraint *models.Constraint) string {
+	// Use the foreign key column name to ensure uniqueness
+	// If there are multiple columns, use the first one
+	if len(constraint.Columns) > 0 {
+		columnName := constraint.Columns[0]
+		// Convert to PascalCase for proper Go field naming
+		// e.g., "rid_filepointer_request" -> "RelRIDFilepointerRequest"
+		return "Rel" + SnakeCaseToPascalCase(columnName)
+	}
+
+	// Fallback to table-based prefix if no columns defined
+	return "Rel" + GeneratePrefix(constraint.ReferencedTable)
+}
+
+// generateHasManyFieldName generates a field name for has-many relationships
+// Uses the foreign key column name + source table name to avoid duplicates
+func (w *Writer) generateHasManyFieldName(constraint *models.Constraint, sourceSchemaName, sourceTableName string) string {
+	// For has-many, we need to include the source table name to avoid duplicates
+	// e.g., multiple tables referencing the same column on this table
+	if len(constraint.Columns) > 0 {
+		columnName := constraint.Columns[0]
+		// Get the model name for the source table (pluralized)
+		sourceModelName := w.getModelName(sourceSchemaName, sourceTableName)
+		// Remove "Model" prefix if present
+		sourceModelName = strings.TrimPrefix(sourceModelName, "Model")
+
+		// Convert column to PascalCase and combine with source table
+		// e.g., "rid_api_provider" + "Login" -> "RelRIDAPIProviderLogins"
+		columnPart := SnakeCaseToPascalCase(columnName)
+		return "Rel" + columnPart + Pluralize(sourceModelName)
+	}
+
+	// Fallback to table-based naming
+	sourceModelName := w.getModelName(sourceSchemaName, sourceTableName)
+	sourceModelName = strings.TrimPrefix(sourceModelName, "Model")
+	return "Rel" + Pluralize(sourceModelName)
+}
+
+// ensureUniqueFieldName ensures a field name is unique by adding numeric suffixes if needed
+func (w *Writer) ensureUniqueFieldName(fieldName string, usedNames map[string]int) string {
+	originalName := fieldName
+	count := usedNames[originalName]
+
+	if count > 0 {
+		// Name is already used, add numeric suffix
+		fieldName = fmt.Sprintf("%s%d", originalName, count+1)
+	}
+
+	// Increment the counter for this base name
+	usedNames[originalName]++
+
+	return fieldName
 }
 
 // getPackageName returns the package name from options or defaults to "models"
@@ -335,6 +411,15 @@ func (w *Writer) writeOutput(content string) error {
 	return nil
 }
 
+// runGoFmt runs go fmt on the specified file
+func (w *Writer) runGoFmt(filepath string) {
+	cmd := exec.Command("gofmt", "-w", filepath)
+	if err := cmd.Run(); err != nil {
+		// Don't fail the whole operation if gofmt fails, just warn
+		fmt.Fprintf(os.Stderr, "Warning: failed to run gofmt on %s: %v\n", filepath, err)
+	}
+}
+
 // shouldUseMultiFile determines whether to use multi-file mode based on metadata or output path
 func (w *Writer) shouldUseMultiFile() bool {
 	// Check if multi_file is explicitly set in metadata

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 ModelUser struct",
+		"type ModelPublicUser struct",
 		"ID",
 		"int64",
 		"Email",
@@ -75,9 +75,9 @@ func TestWriter_WriteTable(t *testing.T) {
 		"time.Time",
 		"gorm:\"column:id",
 		"gorm:\"column:email",
-		"func (m ModelUser) TableName() string",
+		"func (m ModelPublicUser) TableName() string",
 		"return \"public.users\"",
-		"func (m ModelUser) GetID() int64",
+		"func (m ModelPublicUser) GetID() int64",
 	}
 
 	for _, expected := range expectations {
@@ -164,9 +164,437 @@ func TestWriter_WriteDatabase_MultiFile(t *testing.T) {
 		t.Fatalf("Failed to read posts file: %v", err)
 	}
 
-	if !strings.Contains(string(postsContent), "USE *ModelUser") {
-		// Relationship field should be present
-		t.Logf("Posts content:\n%s", string(postsContent))
+	postsStr := string(postsContent)
+
+	// Verify relationship is present with new naming convention
+	// Should now be RelUserID (belongs-to) instead of USE
+	if !strings.Contains(postsStr, "RelUserID") {
+		t.Errorf("Missing relationship field RelUserID (new naming convention)")
+	}
+
+	// Check users file contains has-many relationship
+	usersContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_public_users.go"))
+	if err != nil {
+		t.Fatalf("Failed to read users file: %v", err)
+	}
+
+	usersStr := string(usersContent)
+
+	// Should have RelUserIDPublicPosts (has-many) field - includes schema prefix
+	if !strings.Contains(usersStr, "RelUserIDPublicPosts") {
+		t.Errorf("Missing has-many relationship field RelUserIDPublicPosts")
+	}
+}
+
+func TestWriter_MultipleReferencesToSameTable(t *testing.T) {
+	// Test scenario: api_event table with multiple foreign keys to filepointer table
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("org")
+
+	// Filepointer table
+	filepointer := models.InitTable("filepointer", "org")
+	filepointer.Columns["id_filepointer"] = &models.Column{
+		Name:         "id_filepointer",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	schema.Tables = append(schema.Tables, filepointer)
+
+	// API event table with two foreign keys to filepointer
+	apiEvent := models.InitTable("api_event", "org")
+	apiEvent.Columns["id_api_event"] = &models.Column{
+		Name:         "id_api_event",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	apiEvent.Columns["rid_filepointer_request"] = &models.Column{
+		Name:    "rid_filepointer_request",
+		Type:    "bigint",
+		NotNull: false,
+	}
+	apiEvent.Columns["rid_filepointer_response"] = &models.Column{
+		Name:    "rid_filepointer_response",
+		Type:    "bigint",
+		NotNull: false,
+	}
+
+	// Add constraints
+	apiEvent.Constraints["fk_request"] = &models.Constraint{
+		Name:              "fk_request",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_filepointer_request"},
+		ReferencedTable:   "filepointer",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_filepointer"},
+	}
+	apiEvent.Constraints["fk_response"] = &models.Constraint{
+		Name:              "fk_response",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_filepointer_response"},
+		ReferencedTable:   "filepointer",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_filepointer"},
+	}
+
+	schema.Tables = append(schema.Tables, apiEvent)
+	db.Schemas = append(db.Schemas, schema)
+
+	// Create writer
+	tmpDir := t.TempDir()
+	opts := &writers.WriterOptions{
+		PackageName: "models",
+		OutputPath:  tmpDir,
+		Metadata: map[string]interface{}{
+			"multi_file": true,
+		},
+	}
+
+	writer := NewWriter(opts)
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	// Read the api_event file
+	apiEventContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_org_api_event.go"))
+	if err != nil {
+		t.Fatalf("Failed to read api_event file: %v", err)
+	}
+
+	contentStr := string(apiEventContent)
+
+	// Verify both relationships have unique names based on column names
+	expectations := []struct {
+		fieldName string
+		tag       string
+	}{
+		{"RelRIDFilepointerRequest", "foreignKey:RIDFilepointerRequest"},
+		{"RelRIDFilepointerResponse", "foreignKey:RIDFilepointerResponse"},
+	}
+
+	for _, exp := range expectations {
+		if !strings.Contains(contentStr, exp.fieldName) {
+			t.Errorf("Missing relationship field: %s\nGenerated:\n%s", exp.fieldName, contentStr)
+		}
+		if !strings.Contains(contentStr, exp.tag) {
+			t.Errorf("Missing relationship tag: %s\nGenerated:\n%s", exp.tag, contentStr)
+		}
+	}
+
+	// Verify NO duplicate field names (old behavior would create duplicate "FIL" fields)
+	if strings.Contains(contentStr, "FIL *ModelFilepointer") {
+		t.Errorf("Found old prefix-based naming (FIL), should use column-based naming")
+	}
+
+	// Also verify has-many relationships on filepointer table
+	filepointerContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_org_filepointer.go"))
+	if err != nil {
+		t.Fatalf("Failed to read filepointer file: %v", err)
+	}
+
+	filepointerStr := string(filepointerContent)
+
+	// Should have two different has-many relationships with unique names
+	hasManyExpectations := []string{
+		"RelRIDFilepointerRequestOrgAPIEvents",  // Has many via rid_filepointer_request
+		"RelRIDFilepointerResponseOrgAPIEvents", // Has many via rid_filepointer_response
+	}
+
+	for _, exp := range hasManyExpectations {
+		if !strings.Contains(filepointerStr, exp) {
+			t.Errorf("Missing has-many relationship field: %s\nGenerated:\n%s", exp, filepointerStr)
+		}
+	}
+}
+
+func TestWriter_MultipleHasManyRelationships(t *testing.T) {
+	// Test scenario: api_provider table referenced by multiple tables via rid_api_provider
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("org")
+
+	// Owner table
+	owner := models.InitTable("owner", "org")
+	owner.Columns["id_owner"] = &models.Column{
+		Name:         "id_owner",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	schema.Tables = append(schema.Tables, owner)
+
+	// API Provider table
+	apiProvider := models.InitTable("api_provider", "org")
+	apiProvider.Columns["id_api_provider"] = &models.Column{
+		Name:         "id_api_provider",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	apiProvider.Columns["rid_owner"] = &models.Column{
+		Name:    "rid_owner",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	apiProvider.Constraints["fk_owner"] = &models.Constraint{
+		Name:              "fk_owner",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_owner"},
+		ReferencedTable:   "owner",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_owner"},
+	}
+	schema.Tables = append(schema.Tables, apiProvider)
+
+	// Login table
+	login := models.InitTable("login", "org")
+	login.Columns["id_login"] = &models.Column{
+		Name:         "id_login",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	login.Columns["rid_api_provider"] = &models.Column{
+		Name:    "rid_api_provider",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	login.Constraints["fk_api_provider"] = &models.Constraint{
+		Name:              "fk_api_provider",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_api_provider"},
+		ReferencedTable:   "api_provider",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_api_provider"},
+	}
+	schema.Tables = append(schema.Tables, login)
+
+	// Filepointer table
+	filepointer := models.InitTable("filepointer", "org")
+	filepointer.Columns["id_filepointer"] = &models.Column{
+		Name:         "id_filepointer",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	filepointer.Columns["rid_api_provider"] = &models.Column{
+		Name:    "rid_api_provider",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	filepointer.Constraints["fk_api_provider"] = &models.Constraint{
+		Name:              "fk_api_provider",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_api_provider"},
+		ReferencedTable:   "api_provider",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_api_provider"},
+	}
+	schema.Tables = append(schema.Tables, filepointer)
+
+	// API Event table
+	apiEvent := models.InitTable("api_event", "org")
+	apiEvent.Columns["id_api_event"] = &models.Column{
+		Name:         "id_api_event",
+		Type:         "bigserial",
+		NotNull:      true,
+		IsPrimaryKey: true,
+	}
+	apiEvent.Columns["rid_api_provider"] = &models.Column{
+		Name:    "rid_api_provider",
+		Type:    "bigint",
+		NotNull: true,
+	}
+	apiEvent.Constraints["fk_api_provider"] = &models.Constraint{
+		Name:              "fk_api_provider",
+		Type:              models.ForeignKeyConstraint,
+		Columns:           []string{"rid_api_provider"},
+		ReferencedTable:   "api_provider",
+		ReferencedSchema:  "org",
+		ReferencedColumns: []string{"id_api_provider"},
+	}
+	schema.Tables = append(schema.Tables, apiEvent)
+
+	db.Schemas = append(db.Schemas, schema)
+
+	// Create writer
+	tmpDir := t.TempDir()
+	opts := &writers.WriterOptions{
+		PackageName: "models",
+		OutputPath:  tmpDir,
+		Metadata: map[string]interface{}{
+			"multi_file": true,
+		},
+	}
+
+	writer := NewWriter(opts)
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	// Read the api_provider file
+	apiProviderContent, err := os.ReadFile(filepath.Join(tmpDir, "sql_org_api_provider.go"))
+	if err != nil {
+		t.Fatalf("Failed to read api_provider file: %v", err)
+	}
+
+	contentStr := string(apiProviderContent)
+
+	// Verify all has-many relationships have unique names
+	hasManyExpectations := []string{
+		"RelRIDAPIProviderOrgLogins",      // Has many via Login
+		"RelRIDAPIProviderOrgFilepointers", // Has many via Filepointer
+		"RelRIDAPIProviderOrgAPIEvents",   // Has many via APIEvent
+		"RelRIDOwner",                     // Belongs to via rid_owner
+	}
+
+	for _, exp := range hasManyExpectations {
+		if !strings.Contains(contentStr, exp) {
+			t.Errorf("Missing relationship field: %s\nGenerated:\n%s", exp, contentStr)
+		}
+	}
+
+	// Verify NO duplicate field names
+	// Count occurrences of "RelRIDAPIProvider" fields - should have 3 unique ones
+	count := strings.Count(contentStr, "RelRIDAPIProvider")
+	if count != 3 {
+		t.Errorf("Expected 3 RelRIDAPIProvider* fields, found %d\nGenerated:\n%s", count, contentStr)
+	}
+
+	// Verify no duplicate declarations (would cause compilation error)
+	duplicatePattern := "RelRIDAPIProviders []*Model"
+	if strings.Contains(contentStr, duplicatePattern) {
+		t.Errorf("Found duplicate field declaration pattern, fields should be unique")
+	}
+}
+
+func TestWriter_FieldNameCollision(t *testing.T) {
+	// Test scenario: table with columns that would conflict with generated method names
+	table := models.InitTable("audit_table", "audit")
+	table.Columns["id_audit_table"] = &models.Column{
+		Name:         "id_audit_table",
+		Type:         "smallint",
+		NotNull:      true,
+		IsPrimaryKey: true,
+		Sequence:     1,
+	}
+	table.Columns["table_name"] = &models.Column{
+		Name:     "table_name",
+		Type:     "varchar",
+		Length:   100,
+		NotNull:  true,
+		Sequence: 2,
+	}
+	table.Columns["table_schema"] = &models.Column{
+		Name:     "table_schema",
+		Type:     "varchar",
+		Length:   100,
+		NotNull:  true,
+		Sequence: 3,
+	}
+
+	// Create writer
+	tmpDir := t.TempDir()
+	opts := &writers.WriterOptions{
+		PackageName: "models",
+		OutputPath:  filepath.Join(tmpDir, "test.go"),
+	}
+
+	writer := NewWriter(opts)
+
+	err := writer.WriteTable(table)
+	if err != nil {
+		t.Fatalf("WriteTable failed: %v", err)
+	}
+
+	// Read the generated file
+	content, err := os.ReadFile(opts.OutputPath)
+	if err != nil {
+		t.Fatalf("Failed to read generated file: %v", err)
+	}
+
+	generated := string(content)
+
+	// Verify that TableName field was renamed to TableName_ to avoid collision
+	if !strings.Contains(generated, "TableName_") {
+		t.Errorf("Expected field 'TableName_' (with underscore) but not found\nGenerated:\n%s", generated)
+	}
+
+	// Verify the struct tag still references the correct database column
+	if !strings.Contains(generated, `gorm:"column:table_name;`) {
+		t.Errorf("Expected gorm tag to reference 'table_name' column\nGenerated:\n%s", generated)
+	}
+
+	// Verify the TableName() method still exists and doesn't conflict
+	if !strings.Contains(generated, "func (m ModelAuditAuditTable) TableName() string") {
+		t.Errorf("TableName() method should still be generated\nGenerated:\n%s", generated)
+	}
+
+	// Verify NO field named just "TableName" (without underscore)
+	if strings.Contains(generated, "TableName sql_types") || strings.Contains(generated, "TableName string") {
+		t.Errorf("Field 'TableName' without underscore should not exist (would conflict with method)\nGenerated:\n%s", generated)
+	}
+}
+
+func TestWriter_UpdateIDTypeSafety(t *testing.T) {
+	// Test scenario: tables with different primary key types
+	tests := []struct {
+		name       string
+		pkType     string
+		expectedPK string
+		castType   string
+	}{
+		{"int32_pk", "int", "int32", "int32(newid)"},
+		{"int16_pk", "smallint", "int16", "int16(newid)"},
+		{"int64_pk", "bigint", "int64", "int64(newid)"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			table := models.InitTable("test_table", "public")
+			table.Columns["id"] = &models.Column{
+				Name:         "id",
+				Type:         tt.pkType,
+				NotNull:      true,
+				IsPrimaryKey: true,
+			}
+
+			tmpDir := t.TempDir()
+			opts := &writers.WriterOptions{
+				PackageName: "models",
+				OutputPath:  filepath.Join(tmpDir, "test.go"),
+			}
+
+			writer := NewWriter(opts)
+			err := writer.WriteTable(table)
+			if err != nil {
+				t.Fatalf("WriteTable failed: %v", err)
+			}
+
+			content, err := os.ReadFile(opts.OutputPath)
+			if err != nil {
+				t.Fatalf("Failed to read generated file: %v", err)
+			}
+
+			generated := string(content)
+
+			// Verify UpdateID method has correct type cast
+			if !strings.Contains(generated, tt.castType) {
+				t.Errorf("Expected UpdateID to cast to %s\nGenerated:\n%s", tt.castType, generated)
+			}
+
+			// Verify no invalid int32(newid) for non-int32 types
+			if tt.expectedPK != "int32" && strings.Contains(generated, "int32(newid)") {
+				t.Errorf("UpdateID should not cast to int32 for %s type\nGenerated:\n%s", tt.pkType, generated)
+			}
+
+			// Verify UpdateID parameter is int64 (for consistency)
+			if !strings.Contains(generated, "UpdateID(newid int64)") {
+				t.Errorf("UpdateID should accept int64 parameter\nGenerated:\n%s", generated)
+			}
+		})
 	}
 }
 

pkg/writers/pgsql/migration_writer.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/pgsql"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
@@ -335,7 +336,7 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 				SchemaName: schema.Name,
 				TableName:  modelTable.Name,
 				ColumnName: modelCol.Name,
-				ColumnType: modelCol.Type,
+				ColumnType: pgsql.ConvertSQLType(modelCol.Type),
 				Default:    defaultVal,
 				NotNull:    modelCol.NotNull,
 			})
@@ -359,7 +360,7 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 					SchemaName: schema.Name,
 					TableName:  modelTable.Name,
 					ColumnName: modelCol.Name,
-					NewType:    modelCol.Type,
+					NewType:    pgsql.ConvertSQLType(modelCol.Type),
 				})
 				if err != nil {
 					return nil, err
@@ -427,9 +428,11 @@ func (w *MigrationWriter) generateIndexScripts(model *models.Schema, current *mo
 	for _, modelTable := range model.Tables {
 		currentTable := currentTables[strings.ToLower(modelTable.Name)]
 
-		// Process primary keys first
+		// Process primary keys first - check explicit constraints
+		foundExplicitPK := false
 		for constraintName, constraint := range modelTable.Constraints {
 			if constraint.Type == models.PrimaryKeyConstraint {
+				foundExplicitPK = true
 				shouldCreate := true
 
 				if currentTable != nil {
@@ -464,6 +467,53 @@ func (w *MigrationWriter) generateIndexScripts(model *models.Schema, current *mo
 			}
 		}
 
+		// If no explicit PK constraint, check for columns with IsPrimaryKey = true
+		if !foundExplicitPK {
+			pkColumns := []string{}
+			for _, col := range modelTable.Columns {
+				if col.IsPrimaryKey {
+					pkColumns = append(pkColumns, col.SQLName())
+				}
+			}
+			if len(pkColumns) > 0 {
+				sort.Strings(pkColumns)
+				constraintName := fmt.Sprintf("pk_%s_%s", strings.ToLower(model.Name), strings.ToLower(modelTable.Name))
+				shouldCreate := true
+
+				if currentTable != nil {
+					// Check if a PK constraint already exists (by any name)
+					for _, constraint := range currentTable.Constraints {
+						if constraint.Type == models.PrimaryKeyConstraint {
+							shouldCreate = false
+							break
+						}
+					}
+				}
+
+				if shouldCreate {
+					sql, err := w.executor.ExecuteCreatePrimaryKey(CreatePrimaryKeyData{
+						SchemaName:     model.Name,
+						TableName:      modelTable.Name,
+						ConstraintName: constraintName,
+						Columns:        strings.Join(pkColumns, ", "),
+					})
+					if err != nil {
+						return nil, err
+					}
+
+					script := MigrationScript{
+						ObjectName: fmt.Sprintf("%s.%s.%s", model.Name, modelTable.Name, constraintName),
+						ObjectType: "create primary key",
+						Schema:     model.Name,
+						Priority:   160,
+						Sequence:   len(scripts),
+						Body:       sql,
+					}
+					scripts = append(scripts, script)
+				}
+			}
+		}
+
 		// Process indexes
 		for indexName, modelIndex := range modelTable.Indexes {
 			// Skip primary key indexes

pkg/writers/pgsql/writer.go

@@ -1,20 +1,58 @@
 package pgsql
 
 import (
+	"context"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
 	"sort"
 	"strings"
+	"time"
+
+	"github.com/jackc/pgx/v5"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/pgsql"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
 // Writer implements the Writer interface for PostgreSQL SQL output
 type Writer struct {
-	options *writers.WriterOptions
-	writer  io.Writer
+	options         *writers.WriterOptions
+	writer          io.Writer
+	executionReport *ExecutionReport
+}
+
+// ExecutionReport tracks the execution status of SQL statements
+type ExecutionReport struct {
+	TotalStatements    int              `json:"total_statements"`
+	ExecutedStatements int              `json:"executed_statements"`
+	FailedStatements   int              `json:"failed_statements"`
+	Schemas            []SchemaReport   `json:"schemas"`
+	Errors             []ExecutionError `json:"errors,omitempty"`
+	StartTime          string           `json:"start_time"`
+	EndTime            string           `json:"end_time"`
+}
+
+// SchemaReport tracks execution per schema
+type SchemaReport struct {
+	Name   string        `json:"name"`
+	Tables []TableReport `json:"tables"`
+}
+
+// TableReport tracks execution per table
+type TableReport struct {
+	Name    string `json:"name"`
+	Created bool   `json:"created"`
+	Error   string `json:"error,omitempty"`
+}
+
+// ExecutionError represents a failed statement
+type ExecutionError struct {
+	StatementNumber int    `json:"statement_number"`
+	Statement       string `json:"statement"`
+	Error           string `json:"error"`
 }
 
 // NewWriter creates a new PostgreSQL SQL writer
@@ -26,6 +64,11 @@ func NewWriter(options *writers.WriterOptions) *Writer {
 
 // 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
@@ -127,13 +170,35 @@ func (w *Writer) GenerateSchemaStatements(schema *models.Schema) ([]string, erro
 
 	// Phase 4: Primary keys
 	for _, table := range schema.Tables {
+		// First check for explicit PrimaryKeyConstraint
+		var pkConstraint *models.Constraint
 		for _, constraint := range table.Constraints {
-			if constraint.Type != models.PrimaryKeyConstraint {
-				continue
+			if constraint.Type == models.PrimaryKeyConstraint {
+				pkConstraint = constraint
+				break
 			}
+		}
+
+		if pkConstraint != nil {
 			stmt := fmt.Sprintf("ALTER TABLE %s.%s ADD CONSTRAINT %s PRIMARY KEY (%s)",
-				schema.SQLName(), table.SQLName(), constraint.Name, strings.Join(constraint.Columns, ", "))
+				schema.SQLName(), table.SQLName(), pkConstraint.Name, strings.Join(pkConstraint.Columns, ", "))
 			statements = append(statements, stmt)
+		} else {
+			// No explicit constraint, check for columns with IsPrimaryKey = true
+			pkColumns := []string{}
+			for _, col := range table.Columns {
+				if col.IsPrimaryKey {
+					pkColumns = append(pkColumns, col.SQLName())
+				}
+			}
+			if len(pkColumns) > 0 {
+				// Sort for consistent output
+				sort.Strings(pkColumns)
+				pkName := fmt.Sprintf("pk_%s_%s", schema.SQLName(), table.SQLName())
+				stmt := fmt.Sprintf("ALTER TABLE %s.%s ADD CONSTRAINT %s PRIMARY KEY (%s)",
+					schema.SQLName(), table.SQLName(), pkName, strings.Join(pkColumns, ", "))
+				statements = append(statements, stmt)
+			}
 		}
 	}
 
@@ -155,13 +220,30 @@ func (w *Writer) GenerateSchemaStatements(schema *models.Schema) ([]string, erro
 				indexType = "btree"
 			}
 
+			// Build column expressions with operator class support for GIN indexes
+			columnExprs := make([]string, 0, len(index.Columns))
+			for _, colName := range index.Columns {
+				colExpr := colName
+				if col, ok := table.Columns[colName]; ok {
+					// For GIN indexes on text columns, add operator class
+					if strings.EqualFold(indexType, "gin") && isTextType(col.Type) {
+						opClass := extractOperatorClass(index.Comment)
+						if opClass == "" {
+							opClass = "gin_trgm_ops"
+						}
+						colExpr = fmt.Sprintf("%s %s", colName, opClass)
+					}
+				}
+				columnExprs = append(columnExprs, colExpr)
+			}
+
 			whereClause := ""
 			if index.Where != "" {
 				whereClause = fmt.Sprintf(" WHERE %s", index.Where)
 			}
 
 			stmt := fmt.Sprintf("CREATE %sINDEX IF NOT EXISTS %s ON %s.%s USING %s (%s)%s",
-				uniqueStr, index.Name, schema.SQLName(), table.SQLName(), indexType, strings.Join(index.Columns, ", "), whereClause)
+				uniqueStr, index.Name, schema.SQLName(), table.SQLName(), indexType, strings.Join(columnExprs, ", "), whereClause)
 			statements = append(statements, stmt)
 		}
 	}
@@ -251,15 +333,16 @@ func (w *Writer) generateCreateTableStatement(schema *models.Schema, table *mode
 func (w *Writer) generateColumnDefinition(col *models.Column) string {
 	parts := []string{col.SQLName()}
 
-	// Type with length/precision
-	typeStr := col.Type
+	// Type with length/precision - convert to valid PostgreSQL type
+	baseType := pgsql.ConvertSQLType(col.Type)
+	typeStr := baseType
 	if col.Length > 0 && col.Precision == 0 {
-		typeStr = fmt.Sprintf("%s(%d)", col.Type, col.Length)
+		typeStr = fmt.Sprintf("%s(%d)", baseType, col.Length)
 	} else if col.Precision > 0 {
 		if col.Scale > 0 {
-			typeStr = fmt.Sprintf("%s(%d,%d)", col.Type, col.Precision, col.Scale)
+			typeStr = fmt.Sprintf("%s(%d,%d)", baseType, col.Precision, col.Scale)
 		} else {
-			typeStr = fmt.Sprintf("%s(%d)", col.Type, col.Precision)
+			typeStr = fmt.Sprintf("%s(%d)", baseType, col.Precision)
 		}
 	}
 	parts = append(parts, typeStr)
@@ -273,12 +356,14 @@ func (w *Writer) generateColumnDefinition(col *models.Column) string {
 	if col.Default != nil {
 		switch v := col.Default.(type) {
 		case string:
-			if strings.HasPrefix(v, "nextval") || strings.HasPrefix(v, "CURRENT_") || strings.Contains(v, "()") {
-				parts = append(parts, fmt.Sprintf("DEFAULT %s", v))
-			} else if v == "true" || v == "false" {
-				parts = append(parts, fmt.Sprintf("DEFAULT %s", v))
+			// Strip backticks - DBML uses them for SQL expressions but PostgreSQL doesn't
+			cleanDefault := stripBackticks(v)
+			if strings.HasPrefix(cleanDefault, "nextval") || strings.HasPrefix(cleanDefault, "CURRENT_") || strings.Contains(cleanDefault, "()") {
+				parts = append(parts, fmt.Sprintf("DEFAULT %s", cleanDefault))
+			} else if cleanDefault == "true" || cleanDefault == "false" {
+				parts = append(parts, fmt.Sprintf("DEFAULT %s", cleanDefault))
 			} else {
-				parts = append(parts, fmt.Sprintf("DEFAULT '%s'", escapeQuote(v)))
+				parts = append(parts, fmt.Sprintf("DEFAULT '%s'", escapeQuote(cleanDefault)))
 			}
 		case bool:
 			parts = append(parts, fmt.Sprintf("DEFAULT %v", v))
@@ -405,11 +490,13 @@ func (w *Writer) writeCreateTables(schema *models.Schema) error {
 		columnDefs := make([]string, 0, len(columns))
 
 		for _, col := range columns {
-			colDef := fmt.Sprintf("  %s %s", col.SQLName(), col.Type)
+			colDef := fmt.Sprintf("  %s %s", col.SQLName(), pgsql.ConvertSQLType(col.Type))
 
 			// Add default value if present
-			if col.Default != "" {
-				colDef += fmt.Sprintf(" DEFAULT %s", col.Default)
+			if col.Default != nil && col.Default != "" {
+				// Strip backticks - DBML uses them for SQL expressions but PostgreSQL doesn't
+				defaultVal := fmt.Sprintf("%v", col.Default)
+				colDef += fmt.Sprintf(" DEFAULT %s", stripBackticks(defaultVal))
 			}
 
 			columnDefs = append(columnDefs, colDef)
@@ -437,19 +524,26 @@ func (w *Writer) writePrimaryKeys(schema *models.Schema) error {
 			}
 		}
 
-		if pkConstraint == nil {
-			// No explicit PK constraint, skip
-			continue
-		}
-
+		var columnNames []string
 		pkName := fmt.Sprintf("pk_%s_%s", schema.SQLName(), table.SQLName())
 
-		// Build column list
-		columnNames := make([]string, 0, len(pkConstraint.Columns))
-		for _, colName := range pkConstraint.Columns {
-			if col, ok := table.Columns[colName]; ok {
-				columnNames = append(columnNames, col.SQLName())
+		if pkConstraint != nil {
+			// Build column list from explicit constraint
+			columnNames = make([]string, 0, len(pkConstraint.Columns))
+			for _, colName := range pkConstraint.Columns {
+				if col, ok := table.Columns[colName]; ok {
+					columnNames = append(columnNames, col.SQLName())
+				}
 			}
+		} else {
+			// No explicit PK constraint, check for columns with IsPrimaryKey = true
+			for _, col := range table.Columns {
+				if col.IsPrimaryKey {
+					columnNames = append(columnNames, col.SQLName())
+				}
+			}
+			// Sort for consistent output
+			sort.Strings(columnNames)
 		}
 
 		if len(columnNames) == 0 {
@@ -503,15 +597,24 @@ func (w *Writer) writeIndexes(schema *models.Schema) error {
 				indexName = fmt.Sprintf("%s_%s_%s", indexType, schema.SQLName(), table.SQLName())
 			}
 
-			// Build column list
-			columnNames := make([]string, 0, len(index.Columns))
+			// Build column list with operator class support for GIN indexes
+			columnExprs := make([]string, 0, len(index.Columns))
 			for _, colName := range index.Columns {
 				if col, ok := table.Columns[colName]; ok {
-					columnNames = append(columnNames, col.SQLName())
+					colExpr := col.SQLName()
+					// For GIN indexes on text columns, add operator class
+					if strings.EqualFold(index.Type, "gin") && isTextType(col.Type) {
+						opClass := extractOperatorClass(index.Comment)
+						if opClass == "" {
+							opClass = "gin_trgm_ops"
+						}
+						colExpr = fmt.Sprintf("%s %s", col.SQLName(), opClass)
+					}
+					columnExprs = append(columnExprs, colExpr)
 				}
 			}
 
-			if len(columnNames) == 0 {
+			if len(columnExprs) == 0 {
 				continue
 			}
 
@@ -520,10 +623,20 @@ func (w *Writer) writeIndexes(schema *models.Schema) error {
 				unique = "UNIQUE "
 			}
 
+			indexType := index.Type
+			if indexType == "" {
+				indexType = "btree"
+			}
+
+			whereClause := ""
+			if index.Where != "" {
+				whereClause = fmt.Sprintf(" WHERE %s", index.Where)
+			}
+
 			fmt.Fprintf(w.writer, "CREATE %sINDEX IF NOT EXISTS %s\n",
 				unique, indexName)
-			fmt.Fprintf(w.writer, "  ON %s.%s USING btree (%s);\n\n",
-				schema.SQLName(), table.SQLName(), strings.Join(columnNames, ", "))
+			fmt.Fprintf(w.writer, "  ON %s.%s USING %s (%s)%s;\n\n",
+				schema.SQLName(), table.SQLName(), indexType, strings.Join(columnExprs, ", "), whereClause)
 		}
 	}
 
@@ -718,11 +831,46 @@ func isIntegerType(colType string) bool {
 	return false
 }
 
+// isTextType checks if a column type is a text type (for GIN index operator class)
+func isTextType(colType string) bool {
+	textTypes := []string{"text", "varchar", "character varying", "char", "character", "string"}
+	lowerType := strings.ToLower(colType)
+	for _, t := range textTypes {
+		if strings.HasPrefix(lowerType, t) {
+			return true
+		}
+	}
+	return false
+}
+
+// extractOperatorClass extracts operator class from index comment/note
+// Looks for common operator classes like gin_trgm_ops, gist_trgm_ops, etc.
+func extractOperatorClass(comment string) string {
+	if comment == "" {
+		return ""
+	}
+	lowerComment := strings.ToLower(comment)
+	// Common GIN/GiST operator classes
+	opClasses := []string{"gin_trgm_ops", "gist_trgm_ops", "gin_bigm_ops", "jsonb_ops", "jsonb_path_ops", "array_ops"}
+	for _, op := range opClasses {
+		if strings.Contains(lowerComment, op) {
+			return op
+		}
+	}
+	return ""
+}
+
 // escapeQuote escapes single quotes in strings for SQL
 func escapeQuote(s string) string {
 	return strings.ReplaceAll(s, "'", "''")
 }
 
+// stripBackticks removes backticks from SQL expressions
+// DBML uses backticks for SQL expressions like `now()`, but PostgreSQL doesn't use backticks
+func stripBackticks(s string) string {
+	return strings.ReplaceAll(s, "`", "")
+}
+
 // extractSequenceName extracts sequence name from nextval() expression
 // Example: "nextval('public.users_id_seq'::regclass)" returns "users_id_seq"
 func extractSequenceName(defaultExpr string) string {
@@ -745,3 +893,195 @@ func extractSequenceName(defaultExpr string) string {
 	}
 	return fullName
 }
+
+// executeDatabaseSQL executes SQL statements directly on a PostgreSQL database
+func (w *Writer) executeDatabaseSQL(db *models.Database, connString string) error {
+	// Initialize execution report
+	w.executionReport = &ExecutionReport{
+		StartTime: getCurrentTimestamp(),
+		Schemas:   make([]SchemaReport, 0),
+		Errors:    make([]ExecutionError, 0),
+	}
+
+	// Generate SQL statements
+	statements, err := w.GenerateDatabaseStatements(db)
+	if err != nil {
+		return fmt.Errorf("failed to generate SQL statements: %w", err)
+	}
+
+	w.executionReport.TotalStatements = len(statements)
+
+	// Connect to database
+	ctx := context.Background()
+	conn, err := pgx.Connect(ctx, connString)
+	if err != nil {
+		return fmt.Errorf("failed to connect to database: %w", err)
+	}
+	defer conn.Close(ctx)
+
+	// Track schemas and tables
+	schemaMap := make(map[string]*SchemaReport)
+	currentSchema := ""
+
+	// Execute each statement
+	for i, stmt := range statements {
+		stmtTrimmed := strings.TrimSpace(stmt)
+
+		// Skip comments
+		if strings.HasPrefix(stmtTrimmed, "--") {
+			// Check if this is a schema comment to track schema changes
+			if strings.Contains(stmtTrimmed, "Schema:") {
+				parts := strings.Split(stmtTrimmed, "Schema:")
+				if len(parts) > 1 {
+					currentSchema = strings.TrimSpace(parts[1])
+					if _, exists := schemaMap[currentSchema]; !exists {
+						schemaReport := SchemaReport{
+							Name:   currentSchema,
+							Tables: make([]TableReport, 0),
+						}
+						schemaMap[currentSchema] = &schemaReport
+					}
+				}
+			}
+			continue
+		}
+
+		// Skip empty statements
+		if stmtTrimmed == "" {
+			continue
+		}
+
+		fmt.Fprintf(os.Stderr, "Executing statement %d/%d...\n", i+1, len(statements))
+
+		_, execErr := conn.Exec(ctx, stmt)
+		if execErr != nil {
+			w.executionReport.FailedStatements++
+			execError := ExecutionError{
+				StatementNumber: i + 1,
+				Statement:       truncateStatement(stmt),
+				Error:           execErr.Error(),
+			}
+			w.executionReport.Errors = append(w.executionReport.Errors, execError)
+
+			// Track table creation failure
+			if strings.Contains(strings.ToUpper(stmtTrimmed), "CREATE TABLE") && currentSchema != "" {
+				tableName := extractTableNameFromCreate(stmtTrimmed)
+				if tableName != "" && schemaMap[currentSchema] != nil {
+					schemaMap[currentSchema].Tables = append(schemaMap[currentSchema].Tables, TableReport{
+						Name:    tableName,
+						Created: false,
+						Error:   execErr.Error(),
+					})
+				}
+			}
+
+			// Continue with next statement instead of failing completely
+			fmt.Fprintf(os.Stderr, "⚠ Warning: Statement %d failed: %v\n", i+1, execErr)
+			continue
+		}
+
+		w.executionReport.ExecutedStatements++
+
+		// Track successful table creation
+		if strings.Contains(strings.ToUpper(stmtTrimmed), "CREATE TABLE") && currentSchema != "" {
+			tableName := extractTableNameFromCreate(stmtTrimmed)
+			if tableName != "" && schemaMap[currentSchema] != nil {
+				schemaMap[currentSchema].Tables = append(schemaMap[currentSchema].Tables, TableReport{
+					Name:    tableName,
+					Created: true,
+				})
+			}
+		}
+	}
+
+	// Convert schema map to slice
+	for _, schemaReport := range schemaMap {
+		w.executionReport.Schemas = append(w.executionReport.Schemas, *schemaReport)
+	}
+
+	w.executionReport.EndTime = getCurrentTimestamp()
+
+	// Write report if path is specified
+	if reportPath, ok := w.options.Metadata["report_path"].(string); ok && reportPath != "" {
+		if err := w.writeReport(reportPath); err != nil {
+			fmt.Fprintf(os.Stderr, "⚠ Warning: Failed to write report: %v\n", err)
+		} else {
+			fmt.Fprintf(os.Stderr, "✓ Report written to: %s\n", reportPath)
+		}
+	}
+
+	if w.executionReport.FailedStatements > 0 {
+		fmt.Fprintf(os.Stderr, "⚠ Completed with %d errors out of %d statements\n",
+			w.executionReport.FailedStatements, w.executionReport.TotalStatements)
+	} else {
+		fmt.Fprintf(os.Stderr, "✓ Successfully executed %d statements\n", w.executionReport.ExecutedStatements)
+	}
+
+	return nil
+}
+
+// writeReport writes the execution report to a JSON file
+func (w *Writer) writeReport(reportPath string) error {
+	file, err := os.Create(reportPath)
+	if err != nil {
+		return fmt.Errorf("failed to create report file: %w", err)
+	}
+	defer file.Close()
+
+	encoder := json.NewEncoder(file)
+	encoder.SetIndent("", "  ")
+	if err := encoder.Encode(w.executionReport); err != nil {
+		return fmt.Errorf("failed to encode report: %w", err)
+	}
+
+	return nil
+}
+
+// extractTableNameFromCreate extracts table name from CREATE TABLE statement
+func extractTableNameFromCreate(stmt string) string {
+	// Match: CREATE TABLE [IF NOT EXISTS] schema.table_name or table_name
+	upper := strings.ToUpper(stmt)
+	idx := strings.Index(upper, "CREATE TABLE")
+	if idx == -1 {
+		return ""
+	}
+
+	rest := strings.TrimSpace(stmt[idx+12:]) // Skip "CREATE TABLE"
+
+	// Skip "IF NOT EXISTS"
+	if strings.HasPrefix(strings.ToUpper(rest), "IF NOT EXISTS") {
+		rest = strings.TrimSpace(rest[13:])
+	}
+
+	// Get the table name (first token before '(' or whitespace)
+	tokens := strings.FieldsFunc(rest, func(r rune) bool {
+		return r == '(' || r == ' ' || r == '\n' || r == '\t'
+	})
+
+	if len(tokens) == 0 {
+		return ""
+	}
+
+	// Handle schema.table format
+	fullName := tokens[0]
+	parts := strings.Split(fullName, ".")
+	if len(parts) > 1 {
+		return parts[len(parts)-1]
+	}
+
+	return fullName
+}
+
+// truncateStatement truncates long SQL statements for error messages
+func truncateStatement(stmt string) string {
+	const maxLen = 200
+	if len(stmt) <= maxLen {
+		return stmt
+	}
+	return stmt[:maxLen] + "..."
+}
+
+// getCurrentTimestamp returns the current timestamp in a readable format
+func getCurrentTimestamp() string {
+	return time.Now().Format("2006-01-02 15:04:05")
+}

pkg/writers/pgsql/writer_test.go

@@ -241,3 +241,67 @@ func TestIsIntegerType(t *testing.T) {
 		}
 	}
 }
+
+func TestTypeConversion(t *testing.T) {
+	// Test that invalid Go types are converted to valid PostgreSQL types
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	// Create a test table with Go types instead of SQL types
+	table := models.InitTable("test_types", "public")
+
+	// Add columns with Go types (invalid for PostgreSQL)
+	stringCol := models.InitColumn("name", "test_types", "public")
+	stringCol.Type = "string" // Should be converted to "text"
+	table.Columns["name"] = stringCol
+
+	int64Col := models.InitColumn("big_id", "test_types", "public")
+	int64Col.Type = "int64" // Should be converted to "bigint"
+	table.Columns["big_id"] = int64Col
+
+	int16Col := models.InitColumn("small_id", "test_types", "public")
+	int16Col.Type = "int16" // Should be converted to "smallint"
+	table.Columns["small_id"] = int16Col
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	// Create writer with output to buffer
+	var buf bytes.Buffer
+	options := &writers.WriterOptions{}
+	writer := NewWriter(options)
+	writer.writer = &buf
+
+	// Write the database
+	err := writer.WriteDatabase(db)
+	if err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+
+	// Print output for debugging
+	t.Logf("Generated SQL:\n%s", output)
+
+	// Verify that Go types were converted to PostgreSQL types
+	if strings.Contains(output, "string") {
+		t.Errorf("Output contains 'string' type - should be converted to 'text'\nFull output:\n%s", output)
+	}
+	if strings.Contains(output, "int64") {
+		t.Errorf("Output contains 'int64' type - should be converted to 'bigint'\nFull output:\n%s", output)
+	}
+	if strings.Contains(output, "int16") {
+		t.Errorf("Output contains 'int16' type - should be converted to 'smallint'\nFull output:\n%s", output)
+	}
+
+	// Verify correct PostgreSQL types are present
+	if !strings.Contains(output, "text") {
+		t.Errorf("Output missing 'text' type (converted from 'string')\nFull output:\n%s", output)
+	}
+	if !strings.Contains(output, "bigint") {
+		t.Errorf("Output missing 'bigint' type (converted from 'int64')\nFull output:\n%s", output)
+	}
+	if !strings.Contains(output, "smallint") {
+		t.Errorf("Output missing 'smallint' type (converted from 'int16')\nFull output:\n%s", output)
+	}
+}

pkg/writers/writer.go

@@ -1,6 +1,9 @@
 package writers
 
 import (
+	"regexp"
+	"strings"
+
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 )
 
@@ -28,3 +31,56 @@ type WriterOptions struct {
 	// Additional options can be added here as needed
 	Metadata map[string]interface{}
 }
+
+// SanitizeFilename removes quotes, comments, and invalid characters from identifiers
+// to make them safe for use in filenames. This handles:
+// - Double and single quotes: "table_name" or 'table_name' -> table_name
+// - DBML comments: table [note: 'description'] -> table
+// - Invalid filename characters: replaced with underscores
+func SanitizeFilename(name string) string {
+	// Remove DBML/DCTX style comments in brackets (e.g., [note: 'description'])
+	commentRegex := regexp.MustCompile(`\s*\[.*?\]\s*`)
+	name = commentRegex.ReplaceAllString(name, "")
+
+	// Remove quotes (both single and double)
+	name = strings.ReplaceAll(name, `"`, "")
+	name = strings.ReplaceAll(name, `'`, "")
+
+	// Remove backticks (MySQL style identifiers)
+	name = strings.ReplaceAll(name, "`", "")
+
+	// Replace invalid filename characters with underscores
+	// Invalid chars: / \ : * ? " < > | and control characters
+	invalidChars := regexp.MustCompile(`[/\\:*?"<>|\x00-\x1f\x7f]`)
+	name = invalidChars.ReplaceAllString(name, "_")
+
+	// Trim whitespace and consecutive underscores
+	name = strings.TrimSpace(name)
+	name = regexp.MustCompile(`_+`).ReplaceAllString(name, "_")
+	name = strings.Trim(name, "_")
+
+	return name
+}
+
+// SanitizeStructTagValue sanitizes a value to be safely used inside Go struct tags.
+// Go struct tags are delimited by backticks, so any backtick in the value would break the syntax.
+// This function:
+// - Removes DBML/DCTX comments in brackets
+// - Removes all quotes (double, single, and backticks)
+// - Returns a clean identifier safe for use in struct tags and field names
+func SanitizeStructTagValue(value string) string {
+	// Remove DBML/DCTX style comments in brackets (e.g., [note: 'description'])
+	commentRegex := regexp.MustCompile(`\s*\[.*?\]\s*`)
+	value = commentRegex.ReplaceAllString(value, "")
+
+	// Trim whitespace
+	value = strings.TrimSpace(value)
+
+	// Remove all quotes: backticks, double quotes, and single quotes
+	// This ensures the value is clean for use as Go identifiers and struct tag values
+	value = strings.ReplaceAll(value, "`", "")
+	value = strings.ReplaceAll(value, `"`, "")
+	value = strings.ReplaceAll(value, `'`, "")
+
+	return value
+}

tests/assets/dbml/multifile/1_users.dbml

@@ -0,0 +1,5 @@
+// First file - users table basic structure
+Table public.users {
+  id bigint [pk, increment]
+  email varchar(255) [unique, not null]
+}

tests/assets/dbml/multifile/2_posts.dbml

@@ -0,0 +1,8 @@
+// Second file - posts table
+Table public.posts {
+  id bigint [pk, increment]
+  user_id bigint [not null]
+  title varchar(200) [not null]
+  content text
+  created_at timestamp [not null]
+}

tests/assets/dbml/multifile/3_add_columns.dbml

@@ -0,0 +1,5 @@
+// Third file - adds more columns to users table (tests merging)
+Table public.users {
+  name varchar(100)
+  created_at timestamp [not null]
+}

tests/assets/dbml/multifile/9_refs.dbml

@@ -0,0 +1,10 @@
+// File with commented-out refs - should load last
+// Contains relationships that depend on earlier tables
+
+// Ref: public.posts.user_id > public.users.id [ondelete: CASCADE]
+
+Table public.comments {
+  id bigint [pk, increment]
+  post_id bigint [not null]
+  content text [not null]
+}

vendor/modules.txt

@@ -1,6 +1,92 @@
+# 4d63.com/gocheckcompilerdirectives v1.3.0
+## explicit; go 1.22.0
+# 4d63.com/gochecknoglobals v0.2.2
+## explicit; go 1.18
+# github.com/4meepo/tagalign v1.4.2
+## explicit; go 1.22.0
+# github.com/Abirdcfly/dupword v0.1.3
+## explicit; go 1.22.0
+# github.com/Antonboom/errname v1.0.0
+## explicit; go 1.22.1
+# github.com/Antonboom/nilnil v1.0.1
+## explicit; go 1.22.0
+# github.com/Antonboom/testifylint v1.5.2
+## explicit; go 1.22.1
+# github.com/BurntSushi/toml v1.4.1-0.20240526193622-a339e1f7089c
+## explicit; go 1.18
+# github.com/Crocmagnon/fatcontext v0.7.1
+## explicit; go 1.22.0
+# github.com/Djarvur/go-err113 v0.0.0-20210108212216-aea10b59be24
+## explicit; go 1.13
+# github.com/GaijinEntertainment/go-exhaustruct/v3 v3.3.1
+## explicit; go 1.23.0
+# github.com/Masterminds/semver/v3 v3.3.0
+## explicit; go 1.21
+# github.com/OpenPeeDeeP/depguard/v2 v2.2.1
+## explicit; go 1.23.0
+# github.com/alecthomas/go-check-sumtype v0.3.1
+## explicit; go 1.22.0
+# github.com/alexkohler/nakedret/v2 v2.0.5
+## explicit; go 1.21
+# github.com/alexkohler/prealloc v1.0.0
+## explicit; go 1.15
+# github.com/alingse/asasalint v0.0.11
+## explicit; go 1.18
+# github.com/alingse/nilnesserr v0.1.2
+## explicit; go 1.22.0
+# github.com/ashanbrown/forbidigo v1.6.0
+## explicit; go 1.13
+# github.com/ashanbrown/makezero v1.2.0
+## explicit; go 1.12
+# github.com/beorn7/perks v1.0.1
+## explicit; go 1.11
+# github.com/bkielbasa/cyclop v1.2.3
+## explicit; go 1.22.0
+# github.com/blizzy78/varnamelen v0.8.0
+## explicit; go 1.16
+# github.com/bombsimon/wsl/v4 v4.5.0
+## explicit; go 1.22
+# github.com/breml/bidichk v0.3.2
+## explicit; go 1.22.0
+# github.com/breml/errchkjson v0.4.0
+## explicit; go 1.22.0
+# github.com/butuzov/ireturn v0.3.1
+## explicit; go 1.18
+# github.com/butuzov/mirror v1.3.0
+## explicit; go 1.19
+# github.com/catenacyber/perfsprint v0.8.2
+## explicit; go 1.22.0
+# github.com/ccojocar/zxcvbn-go v1.0.2
+## explicit; go 1.20
+# github.com/cespare/xxhash/v2 v2.3.0
+## explicit; go 1.11
+# github.com/charithe/durationcheck v0.0.10
+## explicit; go 1.14
+# github.com/chavacava/garif v0.1.0
+## explicit; go 1.16
+# github.com/ckaznocha/intrange v0.3.0
+## explicit; go 1.22
+# github.com/curioswitch/go-reassign v0.3.0
+## explicit; go 1.21
+# github.com/daixiang0/gci v0.13.5
+## explicit; go 1.21
 # github.com/davecgh/go-spew v1.1.1
 ## explicit
 github.com/davecgh/go-spew/spew
+# github.com/denis-tingaikin/go-header v0.5.0
+## explicit; go 1.21
+# github.com/ettle/strcase v0.2.0
+## explicit; go 1.12
+# github.com/fatih/color v1.18.0
+## explicit; go 1.17
+# github.com/fatih/structtag v1.2.0
+## explicit; go 1.12
+# github.com/firefart/nonamedreturns v1.0.5
+## explicit; go 1.18
+# github.com/fsnotify/fsnotify v1.5.4
+## explicit; go 1.16
+# github.com/fzipp/gocyclo v0.6.0
+## explicit; go 1.18
 # github.com/gdamore/encoding v1.0.1
 ## explicit; go 1.9
 github.com/gdamore/encoding
@@ -44,9 +130,75 @@ github.com/gdamore/tcell/v2/terminfo/x/xfce
 github.com/gdamore/tcell/v2/terminfo/x/xterm
 github.com/gdamore/tcell/v2/terminfo/x/xterm_ghostty
 github.com/gdamore/tcell/v2/terminfo/x/xterm_kitty
+# github.com/ghostiam/protogetter v0.3.9
+## explicit; go 1.22.0
+# github.com/go-critic/go-critic v0.12.0
+## explicit; go 1.22.0
+# github.com/go-toolsmith/astcast v1.1.0
+## explicit; go 1.16
+# github.com/go-toolsmith/astcopy v1.1.0
+## explicit; go 1.16
+# github.com/go-toolsmith/astequal v1.2.0
+## explicit; go 1.18
+# github.com/go-toolsmith/astfmt v1.1.0
+## explicit; go 1.16
+# github.com/go-toolsmith/astp v1.1.0
+## explicit; go 1.16
+# github.com/go-toolsmith/strparse v1.1.0
+## explicit; go 1.16
+# github.com/go-toolsmith/typep v1.1.0
+## explicit; go 1.16
+# github.com/go-viper/mapstructure/v2 v2.2.1
+## explicit; go 1.18
+# github.com/go-xmlfmt/xmlfmt v1.1.3
+## explicit
+# github.com/gobwas/glob v0.2.3
+## explicit
+# github.com/gofrs/flock v0.12.1
+## explicit; go 1.21.0
+# github.com/golang/protobuf v1.5.3
+## explicit; go 1.9
+# github.com/golangci/dupl v0.0.0-20250308024227-f665c8d69b32
+## explicit; go 1.22.0
+# github.com/golangci/go-printf-func-name v0.1.0
+## explicit; go 1.22.0
+# github.com/golangci/gofmt v0.0.0-20250106114630-d62b90e6713d
+## explicit; go 1.22.0
+# github.com/golangci/golangci-lint v1.64.8
+## explicit; go 1.23.0
+# github.com/golangci/misspell v0.6.0
+## explicit; go 1.21
+# github.com/golangci/plugin-module-register v0.1.1
+## explicit; go 1.21
+# github.com/golangci/revgrep v0.8.0
+## explicit; go 1.21
+# github.com/golangci/unconvert v0.0.0-20240309020433-c5143eacb3ed
+## explicit; go 1.20
+# github.com/google/go-cmp v0.7.0
+## explicit; go 1.21
 # github.com/google/uuid v1.6.0
 ## explicit
 github.com/google/uuid
+# github.com/gordonklaus/ineffassign v0.1.0
+## explicit; go 1.14
+# github.com/gostaticanalysis/analysisutil v0.7.1
+## explicit; go 1.16
+# github.com/gostaticanalysis/comment v1.5.0
+## explicit; go 1.22.9
+# github.com/gostaticanalysis/forcetypeassert v0.2.0
+## explicit; go 1.23.0
+# github.com/gostaticanalysis/nilerr v0.1.1
+## explicit; go 1.15
+# github.com/hashicorp/go-immutable-radix/v2 v2.1.0
+## explicit; go 1.18
+# github.com/hashicorp/go-version v1.7.0
+## explicit
+# github.com/hashicorp/golang-lru/v2 v2.0.7
+## explicit; go 1.18
+# github.com/hashicorp/hcl v1.0.0
+## explicit
+# github.com/hexops/gotextdiff v1.0.3
+## explicit; go 1.16
 # github.com/inconshreveable/mousetrap v1.1.0
 ## explicit; go 1.18
 github.com/inconshreveable/mousetrap
@@ -68,23 +220,115 @@ github.com/jackc/pgx/v5/pgconn/ctxwatch
 github.com/jackc/pgx/v5/pgconn/internal/bgreader
 github.com/jackc/pgx/v5/pgproto3
 github.com/jackc/pgx/v5/pgtype
+# github.com/jgautheron/goconst v1.7.1
+## explicit; go 1.13
+# github.com/jingyugao/rowserrcheck v1.1.1
+## explicit; go 1.13
 # github.com/jinzhu/inflection v1.0.0
 ## explicit
 github.com/jinzhu/inflection
+# github.com/jjti/go-spancheck v0.6.4
+## explicit; go 1.22.1
+# github.com/julz/importas v0.2.0
+## explicit; go 1.20
+# github.com/karamaru-alpha/copyloopvar v1.2.1
+## explicit; go 1.21
+# github.com/kisielk/errcheck v1.9.0
+## explicit; go 1.22.0
+# github.com/kkHAIKE/contextcheck v1.1.6
+## explicit; go 1.23.0
 # github.com/kr/pretty v0.3.1
 ## explicit; go 1.12
+# github.com/kulti/thelper v0.6.3
+## explicit; go 1.18
+# github.com/kunwardeep/paralleltest v1.0.10
+## explicit; go 1.17
+# github.com/lasiar/canonicalheader v1.1.2
+## explicit; go 1.22.0
+# github.com/ldez/exptostd v0.4.2
+## explicit; go 1.22.0
+# github.com/ldez/gomoddirectives v0.6.1
+## explicit; go 1.22.0
+# github.com/ldez/grignotin v0.9.0
+## explicit; go 1.22.0
+# github.com/ldez/tagliatelle v0.7.1
+## explicit; go 1.22.0
+# github.com/ldez/usetesting v0.4.2
+## explicit; go 1.22.0
+# github.com/leonklingele/grouper v1.1.2
+## explicit; go 1.18
 # github.com/lucasb-eyer/go-colorful v1.2.0
 ## explicit; go 1.12
 github.com/lucasb-eyer/go-colorful
+# github.com/macabu/inamedparam v0.1.3
+## explicit; go 1.20
+# github.com/magiconair/properties v1.8.6
+## explicit; go 1.13
+# github.com/maratori/testableexamples v1.0.0
+## explicit; go 1.19
+# github.com/maratori/testpackage v1.1.1
+## explicit; go 1.20
+# github.com/matoous/godox v1.1.0
+## explicit; go 1.18
+# github.com/mattn/go-colorable v0.1.14
+## explicit; go 1.18
+# github.com/mattn/go-isatty v0.0.20
+## explicit; go 1.15
 # github.com/mattn/go-runewidth v0.0.16
 ## explicit; go 1.9
 github.com/mattn/go-runewidth
+# github.com/matttproud/golang_protobuf_extensions v1.0.1
+## explicit
+# github.com/mgechev/revive v1.7.0
+## explicit; go 1.22.1
+# github.com/mitchellh/go-homedir v1.1.0
+## explicit
+# github.com/mitchellh/mapstructure v1.5.0
+## explicit; go 1.14
+# github.com/moricho/tparallel v0.3.2
+## explicit; go 1.20
+# github.com/nakabonne/nestif v0.3.1
+## explicit; go 1.15
+# github.com/nishanths/exhaustive v0.12.0
+## explicit; go 1.18
+# github.com/nishanths/predeclared v0.2.2
+## explicit; go 1.14
+# github.com/nunnatsa/ginkgolinter v0.19.1
+## explicit; go 1.23.0
+# github.com/olekukonko/tablewriter v0.0.5
+## explicit; go 1.12
+# github.com/pelletier/go-toml v1.9.5
+## explicit; go 1.12
+# github.com/pelletier/go-toml/v2 v2.2.3
+## explicit; go 1.21.0
 # github.com/pmezard/go-difflib v1.0.0
 ## explicit
 github.com/pmezard/go-difflib/difflib
+# github.com/polyfloyd/go-errorlint v1.7.1
+## explicit; go 1.22.0
+# github.com/prometheus/client_golang v1.12.1
+## explicit; go 1.13
+# github.com/prometheus/client_model v0.2.0
+## explicit; go 1.9
+# github.com/prometheus/common v0.32.1
+## explicit; go 1.13
+# github.com/prometheus/procfs v0.7.3
+## explicit; go 1.13
 # github.com/puzpuzpuz/xsync/v3 v3.5.1
 ## explicit; go 1.18
 github.com/puzpuzpuz/xsync/v3
+# github.com/quasilyte/go-ruleguard v0.4.3-0.20240823090925-0fe6f58b47b1
+## explicit; go 1.19
+# github.com/quasilyte/go-ruleguard/dsl v0.3.22
+## explicit; go 1.15
+# github.com/quasilyte/gogrep v0.5.0
+## explicit; go 1.16
+# github.com/quasilyte/regex/syntax v0.0.0-20210819130434-b3f0c404a727
+## explicit; go 1.14
+# github.com/quasilyte/stdinfo v0.0.0-20220114132959-f7386bf02567
+## explicit; go 1.17
+# github.com/raeperd/recvcheck v0.2.0
+## explicit; go 1.22.0
 # github.com/rivo/tview v0.42.0
 ## explicit; go 1.18
 github.com/rivo/tview
@@ -93,20 +337,76 @@ github.com/rivo/tview
 github.com/rivo/uniseg
 # github.com/rogpeppe/go-internal v1.14.1
 ## explicit; go 1.23
+# github.com/ryancurrah/gomodguard v1.3.5
+## explicit; go 1.22.0
+# github.com/ryanrolds/sqlclosecheck v0.5.1
+## explicit; go 1.20
+# github.com/sanposhiho/wastedassign/v2 v2.1.0
+## explicit; go 1.18
+# github.com/santhosh-tekuri/jsonschema/v6 v6.0.1
+## explicit; go 1.21
+# github.com/sashamelentyev/interfacebloat v1.1.0
+## explicit; go 1.18
+# github.com/sashamelentyev/usestdlibvars v1.28.0
+## explicit; go 1.20
+# github.com/securego/gosec/v2 v2.22.2
+## explicit; go 1.23.0
+# github.com/sirupsen/logrus v1.9.3
+## explicit; go 1.13
+# github.com/sivchari/containedctx v1.0.3
+## explicit; go 1.17
+# github.com/sivchari/tenv v1.12.1
+## explicit; go 1.22.0
+# github.com/sonatard/noctx v0.1.0
+## explicit; go 1.22.0
+# github.com/sourcegraph/go-diff v0.7.0
+## explicit; go 1.14
+# github.com/spf13/afero v1.12.0
+## explicit; go 1.21
+# github.com/spf13/cast v1.5.0
+## explicit; go 1.18
 # github.com/spf13/cobra v1.10.2
 ## explicit; go 1.15
 github.com/spf13/cobra
+# github.com/spf13/jwalterweatherman v1.1.0
+## explicit
 # github.com/spf13/pflag v1.0.10
 ## explicit; go 1.12
 github.com/spf13/pflag
+# github.com/spf13/viper v1.12.0
+## explicit; go 1.17
+# github.com/ssgreg/nlreturn/v2 v2.2.1
+## explicit; go 1.13
+# github.com/stbenjam/no-sprintf-host-port v0.2.0
+## explicit; go 1.18
+# github.com/stretchr/objx v0.5.2
+## explicit; go 1.20
 # github.com/stretchr/testify v1.11.1
 ## explicit; go 1.17
 github.com/stretchr/testify/assert
 github.com/stretchr/testify/assert/yaml
 github.com/stretchr/testify/require
+# github.com/subosito/gotenv v1.4.1
+## explicit; go 1.18
+# github.com/tdakkota/asciicheck v0.4.1
+## explicit; go 1.22.0
+# github.com/tetafro/godot v1.5.0
+## explicit; go 1.20
+# github.com/timakin/bodyclose v0.0.0-20241017074812-ed6a65f985e3
+## explicit; go 1.12
+# github.com/timonwong/loggercheck v0.10.1
+## explicit; go 1.22.0
 # github.com/tmthrgd/go-hex v0.0.0-20190904060850-447a3041c3bc
 ## explicit
 github.com/tmthrgd/go-hex
+# github.com/tomarrell/wrapcheck/v2 v2.10.0
+## explicit; go 1.21
+# github.com/tommy-muehle/go-mnd/v2 v2.5.1
+## explicit; go 1.12
+# github.com/ultraware/funlen v0.2.0
+## explicit; go 1.22.0
+# github.com/ultraware/whitespace v0.2.0
+## explicit; go 1.20
 # github.com/uptrace/bun v1.2.16
 ## explicit; go 1.24.0
 github.com/uptrace/bun
@@ -118,6 +418,10 @@ github.com/uptrace/bun/internal
 github.com/uptrace/bun/internal/parser
 github.com/uptrace/bun/internal/tagparser
 github.com/uptrace/bun/schema
+# github.com/uudashr/gocognit v1.2.0
+## explicit; go 1.19
+# github.com/uudashr/iface v1.3.1
+## explicit; go 1.22.1
 # github.com/vmihailenco/msgpack/v5 v5.4.1
 ## explicit; go 1.19
 github.com/vmihailenco/msgpack/v5
@@ -127,9 +431,37 @@ github.com/vmihailenco/msgpack/v5/msgpcode
 github.com/vmihailenco/tagparser/v2
 github.com/vmihailenco/tagparser/v2/internal
 github.com/vmihailenco/tagparser/v2/internal/parser
+# github.com/xen0n/gosmopolitan v1.2.2
+## explicit; go 1.19
+# github.com/yagipy/maintidx v1.0.0
+## explicit; go 1.17
+# github.com/yeya24/promlinter v0.3.0
+## explicit; go 1.20
+# github.com/ykadowak/zerologlint v0.1.5
+## explicit; go 1.19
+# gitlab.com/bosi/decorder v0.4.2
+## explicit; go 1.20
+# go-simpler.org/musttag v0.13.0
+## explicit; go 1.20
+# go-simpler.org/sloglint v0.9.0
+## explicit; go 1.22.0
+# go.uber.org/atomic v1.7.0
+## explicit; go 1.13
+# go.uber.org/automaxprocs v1.6.0
+## explicit; go 1.20
+# go.uber.org/multierr v1.6.0
+## explicit; go 1.12
+# go.uber.org/zap v1.24.0
+## explicit; go 1.19
 # golang.org/x/crypto v0.41.0
 ## explicit; go 1.23.0
 golang.org/x/crypto/pbkdf2
+# golang.org/x/exp/typeparams v0.0.0-20250210185358-939b2ce775ac
+## explicit; go 1.18
+# golang.org/x/mod v0.26.0
+## explicit; go 1.23.0
+# golang.org/x/sync v0.16.0
+## explicit; go 1.23.0
 # golang.org/x/sys v0.38.0
 ## explicit; go 1.24.0
 golang.org/x/sys/cpu
@@ -156,6 +488,20 @@ golang.org/x/text/transform
 golang.org/x/text/unicode/bidi
 golang.org/x/text/unicode/norm
 golang.org/x/text/width
+# golang.org/x/tools v0.35.0
+## explicit; go 1.23.0
+# google.golang.org/protobuf v1.36.5
+## explicit; go 1.21
+# gopkg.in/ini.v1 v1.67.0
+## explicit
+# gopkg.in/yaml.v2 v2.4.0
+## explicit; go 1.15
 # gopkg.in/yaml.v3 v3.0.1
 ## explicit
 gopkg.in/yaml.v3
+# honnef.co/go/tools v0.6.1
+## explicit; go 1.23
+# mvdan.cc/gofumpt v0.7.0
+## explicit; go 1.22
+# mvdan.cc/unparam v0.0.0-20240528143540-8a5130ca722f
+## explicit; go 1.21