chore(release): update package version to 1.0.56

- Introduced equivalent base types and variants for PostgreSQL types to normalize type comparisons.
- Added functions for normalizing SQL types and retrieving equivalent type variants.
- Updated migration writer to handle type alterations with checks for existing types.
- Implemented logic to create necessary extensions (e.g., pg_trgm) based on schema requirements.
- Enhanced tests to cover new functionality for type normalization and migration handling.
- Improved handling of GIN indexes to use appropriate operator classes based on column types.

cmd/relspec/convert.go

@@ -52,6 +52,7 @@ var (
 	convertPackageName   string
 	convertSchemaFilter  string
 	convertFlattenSchema bool
+	convertNullableTypes string
 )
 
 var convertCmd = &cobra.Command{
@@ -175,6 +176,7 @@ func init() {
 	convertCmd.Flags().StringVar(&convertPackageName, "package", "", "Package name (for code generation formats like gorm/bun)")
 	convertCmd.Flags().StringVar(&convertSchemaFilter, "schema", "", "Filter to a specific schema by name (required for formats like dctx that only support single schemas)")
 	convertCmd.Flags().BoolVar(&convertFlattenSchema, "flatten-schema", false, "Flatten schema.table names to schema_table (useful for databases like SQLite that do not support schemas)")
+	convertCmd.Flags().StringVar(&convertNullableTypes, "types", "", "Nullable type package for code-gen writers (bun/gorm): 'resolvespec' (default) or 'stdlib' (database/sql)")
 
 	err := convertCmd.MarkFlagRequired("from")
 	if err != nil {
@@ -241,7 +243,7 @@ func runConvert(cmd *cobra.Command, args []string) error {
 		fmt.Fprintf(os.Stderr, "      Schema: %s\n", convertSchemaFilter)
 	}
 
-	if err := writeDatabase(db, convertTargetType, convertTargetPath, convertPackageName, convertSchemaFilter, convertFlattenSchema); err != nil {
+	if err := writeDatabase(db, convertTargetType, convertTargetPath, convertPackageName, convertSchemaFilter, convertFlattenSchema, convertNullableTypes); err != nil {
 		return fmt.Errorf("failed to write target: %w", err)
 	}
 
@@ -284,79 +286,79 @@ func readDatabaseForConvert(dbType, filePath, connString string) (*models.Databa
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for DBML format")
 		}
-		reader = dbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dbml.NewReader(newReaderOptions(filePath, ""))
 
 	case "dctx":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for DCTX format")
 		}
-		reader = dctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dctx.NewReader(newReaderOptions(filePath, ""))
 
 	case "drawdb":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for DrawDB format")
 		}
-		reader = drawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drawdb.NewReader(newReaderOptions(filePath, ""))
 
 	case "json":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for JSON format")
 		}
-		reader = json.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = json.NewReader(newReaderOptions(filePath, ""))
 
 	case "yaml", "yml":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for YAML format")
 		}
-		reader = yaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = yaml.NewReader(newReaderOptions(filePath, ""))
 
 	case "pgsql", "postgres", "postgresql":
 		if connString == "" {
 			return nil, fmt.Errorf("connection string is required for PostgreSQL format")
 		}
-		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+		reader = pgsql.NewReader(newReaderOptions("", connString))
 
 	case "gorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for GORM format")
 		}
-		reader = gorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = gorm.NewReader(newReaderOptions(filePath, ""))
 
 	case "bun":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for Bun format")
 		}
-		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = bun.NewReader(newReaderOptions(filePath, ""))
 
 	case "drizzle":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for Drizzle format")
 		}
-		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drizzle.NewReader(newReaderOptions(filePath, ""))
 
 	case "prisma":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for Prisma format")
 		}
-		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = prisma.NewReader(newReaderOptions(filePath, ""))
 
 	case "typeorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for TypeORM format")
 		}
-		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = typeorm.NewReader(newReaderOptions(filePath, ""))
 
 	case "graphql", "gql":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for GraphQL format")
 		}
-		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = graphql.NewReader(newReaderOptions(filePath, ""))
 
 	case "mssql", "sqlserver", "mssql2016", "mssql2017", "mssql2019", "mssql2022":
 		if connString == "" {
 			return nil, fmt.Errorf("connection string is required for MSSQL format")
 		}
-		reader = mssql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+		reader = mssql.NewReader(newReaderOptions("", connString))
 
 	case "sqlite", "sqlite3":
 		// SQLite can use either file path or connection string
@@ -367,7 +369,7 @@ func readDatabaseForConvert(dbType, filePath, connString string) (*models.Databa
 		if dbPath == "" {
 			return nil, fmt.Errorf("file path or connection string is required for SQLite format")
 		}
-		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+		reader = sqlite.NewReader(newReaderOptions(dbPath, ""))
 
 	default:
 		return nil, fmt.Errorf("unsupported source format: %s", dbType)
@@ -381,14 +383,10 @@ func readDatabaseForConvert(dbType, filePath, connString string) (*models.Databa
 	return db, nil
 }
 
-func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaFilter string, flattenSchema bool) error {
+func writeDatabase(db *models.Database, dbType, outputPath, packageName, schemaFilter string, flattenSchema bool, nullableTypes string) error {
 	var writer writers.Writer
 
-	writerOpts := &writers.WriterOptions{
+	writerOpts := newWriterOptions(outputPath, packageName, flattenSchema, nullableTypes)
-		OutputPath:    outputPath,
-		PackageName:   packageName,
-		FlattenSchema: flattenSchema,
-	}
 
 	switch strings.ToLower(dbType) {
 	case "dbml":

cmd/relspec/edit.go

@@ -240,62 +240,62 @@ func readDatabaseForEdit(dbType, filePath, connString, label string) (*models.Da
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for DBML format", label)
 		}
-		reader = dbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dbml.NewReader(newReaderOptions(filePath, ""))
 	case "dctx":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for DCTX format", label)
 		}
-		reader = dctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dctx.NewReader(newReaderOptions(filePath, ""))
 	case "drawdb":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for DrawDB format", label)
 		}
-		reader = drawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drawdb.NewReader(newReaderOptions(filePath, ""))
 	case "graphql":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for GraphQL format", label)
 		}
-		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = graphql.NewReader(newReaderOptions(filePath, ""))
 	case "json":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for JSON format", label)
 		}
-		reader = json.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = json.NewReader(newReaderOptions(filePath, ""))
 	case "yaml":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for YAML format", label)
 		}
-		reader = yaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = yaml.NewReader(newReaderOptions(filePath, ""))
 	case "gorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for GORM format", label)
 		}
-		reader = gorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = gorm.NewReader(newReaderOptions(filePath, ""))
 	case "bun":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for Bun format", label)
 		}
-		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = bun.NewReader(newReaderOptions(filePath, ""))
 	case "drizzle":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for Drizzle format", label)
 		}
-		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drizzle.NewReader(newReaderOptions(filePath, ""))
 	case "prisma":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for Prisma format", label)
 		}
-		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = prisma.NewReader(newReaderOptions(filePath, ""))
 	case "typeorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for TypeORM format", label)
 		}
-		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = typeorm.NewReader(newReaderOptions(filePath, ""))
 	case "pgsql":
 		if connString == "" {
 			return nil, fmt.Errorf("%s: connection string is required for PostgreSQL format", label)
 		}
-		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+		reader = pgsql.NewReader(newReaderOptions("", connString))
 	case "sqlite", "sqlite3":
 		// SQLite can use either file path or connection string
 		dbPath := filePath
@@ -305,7 +305,7 @@ func readDatabaseForEdit(dbType, filePath, connString, label string) (*models.Da
 		if dbPath == "" {
 			return nil, fmt.Errorf("%s: file path or connection string is required for SQLite format", label)
 		}
-		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+		reader = sqlite.NewReader(newReaderOptions(dbPath, ""))
 	default:
 		return nil, fmt.Errorf("%s: unsupported format: %s", label, dbType)
 	}
@@ -323,31 +323,31 @@ func writeDatabaseForEdit(dbType, filePath, connString string, db *models.Databa
 
 	switch strings.ToLower(dbType) {
 	case "dbml":
-		writer = wdbml.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wdbml.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "dctx":
-		writer = wdctx.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wdctx.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "drawdb":
-		writer = wdrawdb.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wdrawdb.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "graphql":
-		writer = wgraphql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wgraphql.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "json":
-		writer = wjson.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wjson.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "yaml":
-		writer = wyaml.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wyaml.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "gorm":
-		writer = wgorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wgorm.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "bun":
-		writer = wbun.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wbun.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "drizzle":
-		writer = wdrizzle.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wdrizzle.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "prisma":
-		writer = wprisma.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wprisma.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "typeorm":
-		writer = wtypeorm.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wtypeorm.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "sqlite", "sqlite3":
-		writer = wsqlite.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wsqlite.NewWriter(newWriterOptions(filePath, "", false, ""))
 	case "pgsql":
-		writer = wpgsql.NewWriter(&writers.WriterOptions{OutputPath: filePath})
+		writer = wpgsql.NewWriter(newWriterOptions(filePath, "", false, ""))
 	default:
 		return fmt.Errorf("%s: unsupported format: %s", label, dbType)
 	}

cmd/relspec/inspect.go

@@ -221,73 +221,73 @@ func readDatabaseForInspect(dbType, filePath, connString string) (*models.Databa
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for DBML format")
 		}
-		reader = dbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dbml.NewReader(newReaderOptions(filePath, ""))
 
 	case "dctx":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for DCTX format")
 		}
-		reader = dctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dctx.NewReader(newReaderOptions(filePath, ""))
 
 	case "drawdb":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for DrawDB format")
 		}
-		reader = drawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drawdb.NewReader(newReaderOptions(filePath, ""))
 
 	case "graphql":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for GraphQL format")
 		}
-		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = graphql.NewReader(newReaderOptions(filePath, ""))
 
 	case "json":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for JSON format")
 		}
-		reader = json.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = json.NewReader(newReaderOptions(filePath, ""))
 
 	case "yaml", "yml":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for YAML format")
 		}
-		reader = yaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = yaml.NewReader(newReaderOptions(filePath, ""))
 
 	case "gorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for GORM format")
 		}
-		reader = gorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = gorm.NewReader(newReaderOptions(filePath, ""))
 
 	case "bun":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for Bun format")
 		}
-		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = bun.NewReader(newReaderOptions(filePath, ""))
 
 	case "drizzle":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for Drizzle format")
 		}
-		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drizzle.NewReader(newReaderOptions(filePath, ""))
 
 	case "prisma":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for Prisma format")
 		}
-		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = prisma.NewReader(newReaderOptions(filePath, ""))
 
 	case "typeorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("file path is required for TypeORM format")
 		}
-		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = typeorm.NewReader(newReaderOptions(filePath, ""))
 
 	case "pgsql", "postgres", "postgresql":
 		if connString == "" {
 			return nil, fmt.Errorf("connection string is required for PostgreSQL format")
 		}
-		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+		reader = pgsql.NewReader(newReaderOptions("", connString))
 
 	case "sqlite", "sqlite3":
 		// SQLite can use either file path or connection string
@@ -298,7 +298,7 @@ func readDatabaseForInspect(dbType, filePath, connString string) (*models.Databa
 		if dbPath == "" {
 			return nil, fmt.Errorf("file path or connection string is required for SQLite format")
 		}
-		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+		reader = sqlite.NewReader(newReaderOptions(dbPath, ""))
 
 	default:
 		return nil, fmt.Errorf("unsupported database type: %s", dbType)

cmd/relspec/merge.go

@@ -258,6 +258,11 @@ func runMerge(cmd *cobra.Command, args []string) error {
 	fmt.Fprintf(os.Stderr, "      ✓ Merge complete\n\n")
 	fmt.Fprintf(os.Stderr, "%s\n", merge.GetMergeSummary(result))
 
+	if strings.EqualFold(mergeOutputType, "pgsql") && len(result.TypeConflicts) > 0 {
+		return fmt.Errorf("merge detected conflicting existing column types and cannot safely continue with pgsql output\n%s",
+			merge.GetColumnTypeConflictSummary(result, 10))
+	}
+
 	// Step 4: Write output
 	fmt.Fprintf(os.Stderr, "\n[4/4] Writing output...\n")
 	fmt.Fprintf(os.Stderr, "      Format: %s\n", mergeOutputType)
@@ -284,62 +289,62 @@ func readDatabaseForMerge(dbType, filePath, connString, label string) (*models.D
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for DBML format", label)
 		}
-		reader = dbml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dbml.NewReader(newReaderOptions(filePath, ""))
 	case "dctx":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for DCTX format", label)
 		}
-		reader = dctx.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = dctx.NewReader(newReaderOptions(filePath, ""))
 	case "drawdb":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for DrawDB format", label)
 		}
-		reader = drawdb.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drawdb.NewReader(newReaderOptions(filePath, ""))
 	case "graphql":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for GraphQL format", label)
 		}
-		reader = graphql.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = graphql.NewReader(newReaderOptions(filePath, ""))
 	case "json":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for JSON format", label)
 		}
-		reader = json.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = json.NewReader(newReaderOptions(filePath, ""))
 	case "yaml":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for YAML format", label)
 		}
-		reader = yaml.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = yaml.NewReader(newReaderOptions(filePath, ""))
 	case "gorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for GORM format", label)
 		}
-		reader = gorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = gorm.NewReader(newReaderOptions(filePath, ""))
 	case "bun":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for Bun format", label)
 		}
-		reader = bun.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = bun.NewReader(newReaderOptions(filePath, ""))
 	case "drizzle":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for Drizzle format", label)
 		}
-		reader = drizzle.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = drizzle.NewReader(newReaderOptions(filePath, ""))
 	case "prisma":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for Prisma format", label)
 		}
-		reader = prisma.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = prisma.NewReader(newReaderOptions(filePath, ""))
 	case "typeorm":
 		if filePath == "" {
 			return nil, fmt.Errorf("%s: file path is required for TypeORM format", label)
 		}
-		reader = typeorm.NewReader(&readers.ReaderOptions{FilePath: filePath})
+		reader = typeorm.NewReader(newReaderOptions(filePath, ""))
 	case "pgsql":
 		if connString == "" {
 			return nil, fmt.Errorf("%s: connection string is required for PostgreSQL format", label)
 		}
-		reader = pgsql.NewReader(&readers.ReaderOptions{ConnectionString: connString})
+		reader = pgsql.NewReader(newReaderOptions("", connString))
 	case "sqlite", "sqlite3":
 		// SQLite can use either file path or connection string
 		dbPath := filePath
@@ -349,7 +354,7 @@ func readDatabaseForMerge(dbType, filePath, connString, label string) (*models.D
 		if dbPath == "" {
 			return nil, fmt.Errorf("%s: file path or connection string is required for SQLite format", label)
 		}
-		reader = sqlite.NewReader(&readers.ReaderOptions{FilePath: dbPath})
+		reader = sqlite.NewReader(newReaderOptions(dbPath, ""))
 	default:
 		return nil, fmt.Errorf("%s: unsupported format '%s'", label, dbType)
 	}
@@ -370,61 +375,61 @@ func writeDatabaseForMerge(dbType, filePath, connString string, db *models.Datab
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for DBML format", label)
 		}
-		writer = wdbml.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wdbml.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "dctx":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for DCTX format", label)
 		}
-		writer = wdctx.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wdctx.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "drawdb":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for DrawDB format", label)
 		}
-		writer = wdrawdb.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wdrawdb.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "graphql":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for GraphQL format", label)
 		}
-		writer = wgraphql.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wgraphql.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "json":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for JSON format", label)
 		}
-		writer = wjson.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wjson.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "yaml":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for YAML format", label)
 		}
-		writer = wyaml.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wyaml.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "gorm":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for GORM format", label)
 		}
-		writer = wgorm.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wgorm.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "bun":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for Bun format", label)
 		}
-		writer = wbun.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wbun.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "drizzle":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for Drizzle format", label)
 		}
-		writer = wdrizzle.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wdrizzle.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "prisma":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for Prisma format", label)
 		}
-		writer = wprisma.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wprisma.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "typeorm":
 		if filePath == "" {
 			return fmt.Errorf("%s: file path is required for TypeORM format", label)
 		}
-		writer = wtypeorm.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wtypeorm.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "sqlite", "sqlite3":
-		writer = wsqlite.NewWriter(&writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema})
+		writer = wsqlite.NewWriter(newWriterOptions(filePath, "", flattenSchema, ""))
 	case "pgsql":
-		writerOpts := &writers.WriterOptions{OutputPath: filePath, FlattenSchema: flattenSchema}
+		writerOpts := newWriterOptions(filePath, "", flattenSchema, "")
 		if connString != "" {
 			writerOpts.Metadata = map[string]interface{}{
 				"connection_string": connString,

cmd/relspec/merge_from_list_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -160,3 +161,38 @@ func TestRunMerge_FromListMissingSourceType(t *testing.T) {
 		t.Error("expected error when neither --source-path nor --from-list is provided")
 	}
 }
+
+func TestRunMerge_PgsqlOutputRejectsColumnTypeConflict(t *testing.T) {
+	saved := saveMergeState()
+	defer restoreMergeState(saved)
+
+	dir := t.TempDir()
+	targetFile := filepath.Join(dir, "target.json")
+	sourceFile := filepath.Join(dir, "source.json")
+	writeTestJSONWithSingleColumnType(t, targetFile, "users", "integer")
+	writeTestJSONWithSingleColumnType(t, sourceFile, "users", "uuid")
+
+	mergeTargetType = "json"
+	mergeTargetPath = targetFile
+	mergeTargetConn = ""
+	mergeSourceType = "json"
+	mergeSourcePath = sourceFile
+	mergeSourceConn = ""
+	mergeFromList = nil
+	mergeOutputType = "pgsql"
+	mergeOutputPath = ""
+	mergeOutputConn = "postgres://relspec:secret@localhost/testdb"
+	mergeSkipTables = ""
+	mergeReportPath = ""
+
+	err := runMerge(nil, nil)
+	if err == nil {
+		t.Fatal("expected pgsql output merge to fail on column type conflict")
+	}
+	if !strings.Contains(err.Error(), "column type conflicts detected") {
+		t.Fatalf("expected conflict summary in error, got: %v", err)
+	}
+	if !strings.Contains(err.Error(), "public.users.id") {
+		t.Fatalf("expected conflicting column path in error, got: %v", err)
+	}
+}

cmd/relspec/prisma_options.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+func newReaderOptions(filePath, connString string) *readers.ReaderOptions {
+	return &readers.ReaderOptions{
+		FilePath:         filePath,
+		ConnectionString: connString,
+		Prisma7:          prisma7,
+	}
+}
+
+func newWriterOptions(outputPath, packageName string, flattenSchema bool, nullableTypes string) *writers.WriterOptions {
+	return &writers.WriterOptions{
+		OutputPath:    outputPath,
+		PackageName:   packageName,
+		FlattenSchema: flattenSchema,
+		NullableTypes: nullableTypes,
+		Prisma7:       prisma7,
+	}
+}

cmd/relspec/root.go

@@ -12,6 +12,7 @@ var (
 	// Version information, set via ldflags during build
 	version   = "dev"
 	buildDate = "unknown"
+	prisma7   bool
 )
 
 func init() {
@@ -68,4 +69,5 @@ func init() {
 	rootCmd.AddCommand(mergeCmd)
 	rootCmd.AddCommand(splitCmd)
 	rootCmd.AddCommand(versionCmd)
+	rootCmd.PersistentFlags().BoolVar(&prisma7, "prisma7", false, "Use Prisma 7 generator conventions when reading/writing Prisma schemas")
 }

cmd/relspec/split.go

@@ -22,6 +22,7 @@ var (
 	splitDatabaseName  string
 	splitExcludeSchema string
 	splitExcludeTables string
+	splitNullableTypes string
 )
 
 var splitCmd = &cobra.Command{
@@ -110,6 +111,7 @@ func init() {
 	splitCmd.Flags().StringVar(&splitTables, "tables", "", "Comma-separated list of table names to include (case-insensitive)")
 	splitCmd.Flags().StringVar(&splitExcludeSchema, "exclude-schema", "", "Comma-separated list of schema names to exclude")
 	splitCmd.Flags().StringVar(&splitExcludeTables, "exclude-tables", "", "Comma-separated list of table names to exclude (case-insensitive)")
+	splitCmd.Flags().StringVar(&splitNullableTypes, "types", "", "Nullable type package for code-gen writers (bun/gorm): 'resolvespec' (default) or 'stdlib' (database/sql)")
 
 	err := splitCmd.MarkFlagRequired("from")
 	if err != nil {
@@ -185,6 +187,7 @@ func runSplit(cmd *cobra.Command, args []string) error {
 		splitPackageName,
 		"",    // no schema filter for split
 		false, // no flatten-schema for split
+		splitNullableTypes,
 	)
 	if err != nil {
 		return fmt.Errorf("failed to write output: %w", err)

cmd/relspec/testhelpers_test.go

@@ -71,6 +71,40 @@ func writeTestJSON(t *testing.T, path string, tableNames []string) {
 	}
 }
 
+func writeTestJSONWithSingleColumnType(t *testing.T, path, tableName, columnType string) {
+	t.Helper()
+
+	db := minimalDatabase{
+		Name: "test_db",
+		Schemas: []minimalSchema{{
+			Name: "public",
+			Tables: []minimalTable{{
+				Name:   tableName,
+				Schema: "public",
+				Columns: map[string]minimalColumn{
+					"id": {
+						Name:          "id",
+						Table:         tableName,
+						Schema:        "public",
+						Type:          columnType,
+						NotNull:       true,
+						IsPrimaryKey:  true,
+						AutoIncrement: true,
+					},
+				},
+			}},
+		}},
+	}
+
+	data, err := json.Marshal(db)
+	if err != nil {
+		t.Fatalf("failed to marshal test JSON: %v", err)
+	}
+	if err := os.WriteFile(path, data, 0644); err != nil {
+		t.Fatalf("failed to write test file %s: %v", path, err)
+	}
+}
+
 // convertState captures and restores all convert global vars.
 type convertState struct {
 	sourceType    string

linux/arch/PKGBUILD

@@ -1,6 +1,6 @@
 # Maintainer: Hein (Warky Devs) <hein@warky.dev>
 pkgname=relspec
-pkgver=1.0.44
+pkgver=1.0.56
 pkgrel=1
 pkgdesc="RelSpec is a comprehensive database relations management tool that reads, transforms, and writes database table specifications across multiple formats and ORMs."
 arch=('x86_64' 'aarch64')

linux/centos/relspec.spec

@@ -1,5 +1,5 @@
 Name:           relspec
-Version:        1.0.44
+Version:        1.0.56
 Release:        1%{?dist}
 Summary:        RelSpec is a comprehensive database relations management tool that reads, transforms, and writes database table specifications across multiple formats and ORMs.
 

pkg/merge/merge.go

@@ -22,6 +22,16 @@ type MergeResult struct {
 	EnumsAdded       int
 	ViewsAdded       int
 	SequencesAdded   int
+	TypeConflicts    []ColumnTypeConflict
+}
+
+// ColumnTypeConflict describes a column that exists in both schemas but with incompatible types.
+type ColumnTypeConflict struct {
+	Schema     string
+	Table      string
+	Column     string
+	TargetType string
+	SourceType string
 }
 
 // MergeOptions contains options for merge operations
@@ -146,11 +156,19 @@ func (r *MergeResult) mergeColumns(table *models.Table, srcTable *models.Table)
 
 	// Merge columns
 	for colName, srcCol := range srcTable.Columns {
-		if _, exists := existingColumns[colName]; !exists {
+		if tgtCol, exists := existingColumns[colName]; !exists {
 			// Column doesn't exist, add it
 			newCol := cloneColumn(srcCol)
 			table.Columns[colName] = newCol
 			r.ColumnsAdded++
+		} else if columnTypeConflict(tgtCol, srcCol) {
+			r.TypeConflicts = append(r.TypeConflicts, ColumnTypeConflict{
+				Schema:     firstNonEmpty(table.Schema, srcTable.Schema, srcCol.Schema),
+				Table:      firstNonEmpty(table.Name, srcTable.Name, srcCol.Table),
+				Column:     firstNonEmpty(tgtCol.Name, srcCol.Name, colName),
+				TargetType: describeColumnType(tgtCol),
+				SourceType: describeColumnType(srcCol),
+			})
 		}
 	}
 }
@@ -426,6 +444,52 @@ func cloneColumn(col *models.Column) *models.Column {
 	return newCol
 }
 
+func columnTypeConflict(target, source *models.Column) bool {
+	if target == nil || source == nil {
+		return false
+	}
+
+	return normalizeType(target.Type) != normalizeType(source.Type) ||
+		target.Length != source.Length ||
+		target.Precision != source.Precision ||
+		target.Scale != source.Scale
+}
+
+func normalizeType(value string) string {
+	return strings.ToLower(strings.TrimSpace(value))
+}
+
+func describeColumnType(col *models.Column) string {
+	if col == nil {
+		return ""
+	}
+
+	typeName := strings.TrimSpace(col.Type)
+	if typeName == "" {
+		return ""
+	}
+
+	switch {
+	case col.Precision > 0 && col.Scale > 0:
+		return fmt.Sprintf("%s(%d,%d)", typeName, col.Precision, col.Scale)
+	case col.Precision > 0:
+		return fmt.Sprintf("%s(%d)", typeName, col.Precision)
+	case col.Length > 0:
+		return fmt.Sprintf("%s(%d)", typeName, col.Length)
+	default:
+		return typeName
+	}
+}
+
+func firstNonEmpty(values ...string) string {
+	for _, value := range values {
+		if strings.TrimSpace(value) != "" {
+			return value
+		}
+	}
+	return ""
+}
+
 func cloneConstraint(constraint *models.Constraint) *models.Constraint {
 	if constraint == nil {
 		return nil
@@ -609,6 +673,7 @@ func GetMergeSummary(result *MergeResult) string {
 		fmt.Sprintf("Enums added:       %d", result.EnumsAdded),
 		fmt.Sprintf("Relations added:   %d", result.RelationsAdded),
 		fmt.Sprintf("Domains added:     %d", result.DomainsAdded),
+		fmt.Sprintf("Type conflicts:    %d", len(result.TypeConflicts)),
 	}
 
 	totalAdded := result.SchemasAdded + result.TablesAdded + result.ColumnsAdded +
@@ -625,3 +690,35 @@ func GetMergeSummary(result *MergeResult) string {
 
 	return summary
 }
+
+// GetColumnTypeConflictSummary returns a short, human-readable conflict summary.
+func GetColumnTypeConflictSummary(result *MergeResult, limit int) string {
+	if result == nil || len(result.TypeConflicts) == 0 {
+		return ""
+	}
+	if limit <= 0 {
+		limit = len(result.TypeConflicts)
+	}
+
+	lines := make([]string, 0, min(limit, len(result.TypeConflicts))+1)
+	lines = append(lines, "column type conflicts detected:")
+	for i, conflict := range result.TypeConflicts {
+		if i >= limit {
+			break
+		}
+		lines = append(lines, fmt.Sprintf("  - %s.%s.%s: target=%s source=%s",
+			conflict.Schema, conflict.Table, conflict.Column, conflict.TargetType, conflict.SourceType))
+	}
+	if len(result.TypeConflicts) > limit {
+		lines = append(lines, fmt.Sprintf("  ... and %d more", len(result.TypeConflicts)-limit))
+	}
+
+	return strings.Join(lines, "\n")
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}

pkg/merge/merge_test.go

@@ -1,6 +1,7 @@
 package merge
 
 import (
+	"strings"
 	"testing"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
@@ -140,6 +141,61 @@ func TestMergeColumns_NewColumn(t *testing.T) {
 	}
 }
 
+func TestMergeColumns_TypeConflictIsDetected(t *testing.T) {
+	target := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:   "users",
+						Schema: "public",
+						Columns: map[string]*models.Column{
+							"email": {Name: "email", Type: "varchar", Length: 255},
+						},
+					},
+				},
+			},
+		},
+	}
+	source := &models.Database{
+		Schemas: []*models.Schema{
+			{
+				Name: "public",
+				Tables: []*models.Table{
+					{
+						Name:   "users",
+						Schema: "public",
+						Columns: map[string]*models.Column{
+							"email": {Name: "email", Type: "text"},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	result := MergeDatabases(target, source, nil)
+
+	if len(result.TypeConflicts) != 1 {
+		t.Fatalf("Expected 1 type conflict, got %d", len(result.TypeConflicts))
+	}
+	conflict := result.TypeConflicts[0]
+	if conflict.Schema != "public" || conflict.Table != "users" || conflict.Column != "email" {
+		t.Fatalf("Unexpected conflict location: %+v", conflict)
+	}
+	if conflict.TargetType != "varchar(255)" {
+		t.Fatalf("Expected target type varchar(255), got %q", conflict.TargetType)
+	}
+	if conflict.SourceType != "text" {
+		t.Fatalf("Expected source type text, got %q", conflict.SourceType)
+	}
+
+	if got := target.Schemas[0].Tables[0].Columns["email"].Type; got != "varchar" {
+		t.Fatalf("Expected target column type to remain unchanged, got %q", got)
+	}
+}
+
 func TestMergeConstraints_NewConstraint(t *testing.T) {
 	target := &models.Database{
 		Schemas: []*models.Schema{
@@ -509,6 +565,9 @@ func TestGetMergeSummary(t *testing.T) {
 		ConstraintsAdded: 3,
 		IndexesAdded:     2,
 		ViewsAdded:       1,
+		TypeConflicts: []ColumnTypeConflict{
+			{Schema: "public", Table: "users", Column: "email", TargetType: "varchar(255)", SourceType: "text"},
+		},
 	}
 
 	summary := GetMergeSummary(result)
@@ -518,6 +577,9 @@ func TestGetMergeSummary(t *testing.T) {
 	if len(summary) < 50 {
 		t.Errorf("Summary seems too short: %s", summary)
 	}
+	if !strings.Contains(summary, "Type conflicts:    1") {
+		t.Errorf("Expected type conflict count in summary, got: %s", summary)
+	}
 }
 
 func TestGetMergeSummary_Nil(t *testing.T) {

pkg/pgsql/types_registry.go

@@ -145,6 +145,24 @@ var postgresTypeAliases = map[string]string{
 	"bool": "boolean",
 }
 
+var postgresEquivalentBaseTypes = map[string]string{
+	"character varying":           "varchar",
+	"character":                   "char",
+	"timestamp without time zone": "timestamp",
+	"timestamp with time zone":    "timestamptz",
+	"time without time zone":      "time",
+	"time with time zone":         "timetz",
+}
+
+var postgresEquivalentBaseTypeVariants = map[string][]string{
+	"varchar":     {"varchar", "character varying"},
+	"char":        {"char", "character"},
+	"timestamp":   {"timestamp", "timestamp without time zone"},
+	"timestamptz": {"timestamptz", "timestamp with time zone"},
+	"time":        {"time", "time without time zone"},
+	"timetz":      {"timetz", "time with time zone"},
+}
+
 // GetPostgresBaseTypes returns a sorted-ish stable list of registered base type names.
 func GetPostgresBaseTypes() []string {
 	result := make([]string, 0, len(postgresBaseTypes))
@@ -212,6 +230,86 @@ func CanonicalizeBaseType(baseType string) string {
 	return base
 }
 
+// EquivalentBaseType resolves broader SQL-equivalent spellings to a common comparable form.
+func EquivalentBaseType(baseType string) string {
+	base := CanonicalizeBaseType(baseType)
+	if equivalent, ok := postgresEquivalentBaseTypes[base]; ok {
+		return equivalent
+	}
+	return base
+}
+
+// NormalizeEquivalentSQLType returns a normalized SQL type string suitable for equality checks.
+// Equivalent spellings such as "character varying(255)" and "varchar(255)" normalize identically.
+func NormalizeEquivalentSQLType(sqlType string) string {
+	t := normalizeTypeToken(sqlType)
+	if t == "" {
+		return ""
+	}
+
+	arrayDepth := 0
+	for strings.HasSuffix(t, "[]") {
+		arrayDepth++
+		t = strings.TrimSpace(strings.TrimSuffix(t, "[]"))
+	}
+
+	modifier := ""
+	if idx := strings.Index(t, "("); idx >= 0 {
+		modifier = strings.TrimSpace(t[idx:])
+		t = strings.TrimSpace(t[:idx])
+	}
+
+	base := EquivalentBaseType(t)
+	normalized := base + modifier
+	for i := 0; i < arrayDepth; i++ {
+		normalized += "[]"
+	}
+	return normalized
+}
+
+// EquivalentSQLTypeVariants returns equivalent PostgreSQL spellings for a SQL type.
+// Examples:
+// - varchar(255) -> ["varchar(255)", "character varying(255)"]
+// - timestamptz -> ["timestamptz", "timestamp with time zone"]
+func EquivalentSQLTypeVariants(sqlType string) []string {
+	t := normalizeTypeToken(sqlType)
+	if t == "" {
+		return nil
+	}
+
+	arrayDepth := 0
+	for strings.HasSuffix(t, "[]") {
+		arrayDepth++
+		t = strings.TrimSpace(strings.TrimSuffix(t, "[]"))
+	}
+
+	modifier := ""
+	if idx := strings.Index(t, "("); idx >= 0 {
+		modifier = strings.TrimSpace(t[idx:])
+		t = strings.TrimSpace(t[:idx])
+	}
+
+	base := EquivalentBaseType(t)
+	bases := postgresEquivalentBaseTypeVariants[base]
+	if len(bases) == 0 {
+		bases = []string{base}
+	}
+
+	seen := make(map[string]bool, len(bases))
+	result := make([]string, 0, len(bases))
+	for _, variantBase := range bases {
+		variant := variantBase + modifier
+		for i := 0; i < arrayDepth; i++ {
+			variant += "[]"
+		}
+		if !seen[variant] {
+			seen[variant] = true
+			result = append(result, variant)
+		}
+	}
+	return result
+}
+
 // IsKnownPostgresType reports whether a type (including array forms) exists in the registry.
 func IsKnownPostgresType(sqlType string) bool {
 	base := CanonicalizeBaseType(ExtractBaseTypeLower(sqlType))

pkg/pgsql/types_registry_test.go

@@ -97,3 +97,51 @@ func TestPostgresTypeRegistry_TypeParsingAndCapabilities(t *testing.T) {
 		})
 	}
 }
+
+func TestNormalizeEquivalentSQLType(t *testing.T) {
+	tests := []struct {
+		input string
+		want  string
+	}{
+		{input: "character varying(255)", want: "varchar(255)"},
+		{input: "varchar(255)", want: "varchar(255)"},
+		{input: "timestamp with time zone", want: "timestamptz"},
+		{input: "timestamptz", want: "timestamptz"},
+		{input: "time without time zone", want: "time"},
+		{input: "character varying(255)[]", want: "varchar(255)[]"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got := NormalizeEquivalentSQLType(tt.input)
+			if got != tt.want {
+				t.Fatalf("NormalizeEquivalentSQLType(%q) = %q, want %q", tt.input, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestEquivalentSQLTypeVariants(t *testing.T) {
+	tests := []struct {
+		input string
+		want  []string
+	}{
+		{input: "character varying(255)", want: []string{"varchar(255)", "character varying(255)"}},
+		{input: "timestamptz", want: []string{"timestamptz", "timestamp with time zone"}},
+		{input: "text[]", want: []string{"text[]"}},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got := EquivalentSQLTypeVariants(tt.input)
+			if len(got) != len(tt.want) {
+				t.Fatalf("EquivalentSQLTypeVariants(%q) len = %d, want %d (%v)", tt.input, len(got), len(tt.want), got)
+			}
+			for i := range tt.want {
+				if got[i] != tt.want[i] {
+					t.Fatalf("EquivalentSQLTypeVariants(%q)[%d] = %q, want %q", tt.input, i, got[i], tt.want[i])
+				}
+			}
+		})
+	}
+}

pkg/readers/pgsql/queries.go

@@ -252,7 +252,7 @@ func (r *Reader) queryColumns(schemaName string) (map[string]map[string]*models.
 				column.AutoIncrement = true
 				column.Default = defaultVal
 			} else {
-				column.Default = defaultVal
+				column.Default = normalizePostgresDefault(defaultVal)
 			}
 		}
 
@@ -613,3 +613,30 @@ func (r *Reader) parseIndexDefinition(indexName, tableName, schema, indexDef str
 
 	return index, nil
 }
+
+// normalizePostgresDefault converts a raw PostgreSQL column_default expression into the
+// unquoted string value that the model convention expects. PostgreSQL stores string
+// literal defaults as 'value' or 'value'::type (e.g. '{}'::text[]), while every other
+// reader stores the bare value so the writer can re-quote it correctly.
+func normalizePostgresDefault(defaultVal string) string {
+	if !strings.HasPrefix(defaultVal, "'") {
+		return defaultVal
+	}
+	// Decode the SQL string literal: skip the leading quote, unescape '' → ', stop at
+	// the first unescaped closing quote (any trailing ::cast is ignored).
+	rest := defaultVal[1:]
+	var buf strings.Builder
+	for i := 0; i < len(rest); i++ {
+		if rest[i] == '\'' {
+			if i+1 < len(rest) && rest[i+1] == '\'' {
+				buf.WriteByte('\'')
+				i++
+			} else {
+				break
+			}
+		} else {
+			buf.WriteByte(rest[i])
+		}
+	}
+	return buf.String()
+}

pkg/readers/prisma/reader.go

@@ -70,6 +70,7 @@ func (r *Reader) ReadTable() (*models.Table, error) {
 // parsePrisma parses Prisma schema content and returns a Database model
 func (r *Reader) parsePrisma(content string) (*models.Database, error) {
 	db := models.InitDatabase("database")
+	db.SourceFormat = "prisma"
 
 	if r.options.Metadata != nil {
 		if name, ok := r.options.Metadata["name"].(string); ok {
@@ -139,7 +140,7 @@ func (r *Reader) parsePrisma(content string) (*models.Database, error) {
 			case "datasource":
 				r.parseDatasource(blockContent, db)
 			case "generator":
-				// We don't need to do anything with generator blocks
+				r.parseGenerator(blockContent, db)
 			case "model":
 				if currentTable != nil {
 					r.parseModelFields(blockContent, currentTable)
@@ -173,10 +174,34 @@ func (r *Reader) parsePrisma(content string) (*models.Database, error) {
 	// Second pass: resolve relationships
 	r.resolveRelationships(schema)
 
+	if db.SourceFormat == "prisma" && r.options != nil && r.options.Prisma7 {
+		db.SourceFormat = "prisma7"
+	}
+
 	db.Schemas = append(db.Schemas, schema)
 	return db, nil
 }
 
+func (r *Reader) parseGenerator(lines []string, db *models.Database) {
+	providerRegex := regexp.MustCompile(`provider\s*=\s*"([^"]+)"`)
+
+	for _, line := range lines {
+		if matches := providerRegex.FindStringSubmatch(line); matches != nil {
+			switch matches[1] {
+			case "prisma-client":
+				db.SourceFormat = "prisma7"
+			default:
+				db.SourceFormat = "prisma"
+			}
+			return
+		}
+	}
+
+	if r.options != nil && r.options.Prisma7 {
+		db.SourceFormat = "prisma7"
+	}
+}
+
 // parseDatasource extracts database type from datasource block
 func (r *Reader) parseDatasource(lines []string, db *models.Database) {
 	providerRegex := regexp.MustCompile(`provider\s*=\s*"?(\w+)"?`)

pkg/readers/prisma/reader_test.go

@@ -0,0 +1,77 @@
+package prisma
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/readers"
+)
+
+func TestReadDatabase_Prisma7GeneratorSetsSourceFormat(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	schemaPath := filepath.Join(tmpDir, "schema.prisma")
+
+	content := `datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+generator client {
+  provider = "prisma-client"
+  output   = "./generated"
+}
+
+model User {
+  id Int @id @default(autoincrement())
+}`
+
+	if err := os.WriteFile(schemaPath, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to write schema: %v", err)
+	}
+
+	reader := NewReader(&readers.ReaderOptions{FilePath: schemaPath})
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() failed: %v", err)
+	}
+
+	if db.SourceFormat != "prisma7" {
+		t.Fatalf("expected SourceFormat prisma7, got %q", db.SourceFormat)
+	}
+}
+
+func TestReadDatabase_Prisma7FlagSetsSourceFormatWithoutGenerator(t *testing.T) {
+	t.Parallel()
+
+	tmpDir := t.TempDir()
+	schemaPath := filepath.Join(tmpDir, "schema.prisma")
+
+	content := `datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id Int @id @default(autoincrement())
+}`
+
+	if err := os.WriteFile(schemaPath, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to write schema: %v", err)
+	}
+
+	reader := NewReader(&readers.ReaderOptions{
+		FilePath: schemaPath,
+		Prisma7:  true,
+	})
+	db, err := reader.ReadDatabase()
+	if err != nil {
+		t.Fatalf("ReadDatabase() failed: %v", err)
+	}
+
+	if db.SourceFormat != "prisma7" {
+		t.Fatalf("expected SourceFormat prisma7 from flag, got %q", db.SourceFormat)
+	}
+}

pkg/readers/reader.go

@@ -25,6 +25,9 @@ type ReaderOptions struct {
 	// ConnectionString is the database connection string (for DB readers)
 	ConnectionString string
 
+	// Prisma7 enables Prisma 7-specific handling for Prisma schemas.
+	Prisma7 bool
+
 	// Additional options can be added here as needed
 	Metadata map[string]interface{}
 }

pkg/writers/bun/README.md

@@ -46,54 +46,67 @@ func main() {
 ### CLI Examples
 
 ```bash
-# Generate Bun models from PostgreSQL database
+# Generate Bun models from a DBML schema (default: resolvespec types)
-relspec --input pgsql \
+relspec convert --from dbml --from-path schema.dbml \
-  --conn "postgres://localhost/mydb" \
+  --to bun --to-path models.go --package models
-  --output bun \
-  --out-file models.go \
-  --package models
 
-# Convert GORM models to Bun
+# Use standard library database/sql nullable types instead of resolvespec
-relspec --input gorm --in-file gorm_models.go --output bun --out-file bun_models.go
+relspec convert --from dbml --from-path schema.dbml \
+  --to bun --to-path models.go --package models \
+  --types stdlib
 
-# Multi-file output
+# Explicitly select resolvespec types (same as omitting --types)
-relspec --input json --in-file schema.json --output bun --out-file models/
+relspec convert --from pgsql --from-conn "postgres://localhost/mydb" \
+  --to bun --to-path models.go --package models \
+  --types resolvespec
+
+# Multi-file output (one file per table)
+relspec convert --from json --from-path schema.json \
+  --to bun --to-path models/ --package models
 ```
 
-## Generated Code Example
+## Generated Code Examples
+
+### Default — resolvespec types (`--types resolvespec`)
 
 ```go
 package models
 
 import (
-    "time"
+    resolvespec_common "github.com/bitechdev/ResolveSpec/pkg/spectypes"
-    "database/sql"
     "github.com/uptrace/bun"
 )
 
 type User struct {
     bun.BaseModel `bun:"table:users,alias:u"`
 
-    ID        int64     `bun:"id,pk,autoincrement" json:"id"`
+    ID        int64                              `bun:"id,type:uuid,pk," json:"id"`
-    Username  string    `bun:"username,notnull,unique" json:"username"`
+    Username  string                             `bun:"username,type:text,notnull," json:"username"`
-    Email     string    `bun:"email,notnull" json:"email"`
+    Email     resolvespec_common.SqlString       `bun:"email,type:text,nullzero," json:"email"`
-    Bio       sql.NullString `bun:"bio" json:"bio,omitempty"`
+    Tags      resolvespec_common.SqlStringArray  `bun:"tags,type:text[],default:'{}',notnull," json:"tags"`
-    CreatedAt time.Time `bun:"created_at,notnull,default:now()" json:"created_at"`
+    CreatedAt resolvespec_common.SqlTimeStamp    `bun:"created_at,type:timestamptz,default:now(),notnull," json:"created_at"`
-
-    // Relationships
-    Posts []*Post `bun:"rel:has-many,join:id=user_id" json:"posts,omitempty"`
 }
+```
 
-type Post struct {
+### Standard library — `--types stdlib`
-    bun.BaseModel `bun:"table:posts,alias:p"`
 
-    ID      int64          `bun:"id,pk" json:"id"`
+```go
-    UserID  int64          `bun:"user_id,notnull" json:"user_id"`
+package models
-    Title   string         `bun:"title,notnull" json:"title"`
-    Content sql.NullString `bun:"content" json:"content,omitempty"`
 
-    // Belongs to
+import (
-    User *User `bun:"rel:belongs-to,join:user_id=id" json:"user,omitempty"`
+    "database/sql"
+    "time"
+    "github.com/uptrace/bun"
+)
+
+type User struct {
+    bun.BaseModel `bun:"table:users,alias:u"`
+
+    ID        string         `bun:"id,type:uuid,pk," json:"id"`
+    Username  string         `bun:"username,type:text,notnull," json:"username"`
+    Email     sql.NullString `bun:"email,type:text,nullzero," json:"email"`
+    Tags      []string       `bun:"tags,type:text[],default:'{}',notnull," json:"tags"`
+    CreatedAt time.Time      `bun:"created_at,type:timestamptz,default:now(),notnull," json:"created_at"`
 }
 ```
 
@@ -111,19 +124,68 @@ type Post struct {
 
 ## Type Mapping
 
-| SQL Type | Go Type | Nullable Type |
+The nullable type package is selected with `--types` (or `WriterOptions.NullableTypes`).
-|----------|---------|---------------|
+
-| bigint | int64 | sql.NullInt64 |
+| SQL Type | NOT NULL (both) | Nullable — resolvespec | Nullable — stdlib |
-| integer | int | sql.NullInt32 |
+|---|---|---|---|
-| varchar, text | string | sql.NullString |
+| `bigint` | `int64` | `SqlInt64` | `sql.NullInt64` |
-| boolean | bool | sql.NullBool |
+| `integer` | `int32` | `SqlInt32` | `sql.NullInt32` |
-| timestamp | time.Time | sql.NullTime |
+| `smallint` | `int16` | `SqlInt16` | `sql.NullInt16` |
-| numeric | float64 | sql.NullFloat64 |
+| `text`, `varchar` | `string` | `SqlString` | `sql.NullString` |
+| `boolean` | `bool` | `SqlBool` | `sql.NullBool` |
+| `timestamp`, `timestamptz` | `time.Time`* | `SqlTimeStamp` | `sql.NullTime` |
+| `numeric`, `decimal` | `float64` | `SqlFloat64` | `sql.NullFloat64` |
+| `uuid` | `string` | `SqlUUID` | `sql.NullString` |
+| `jsonb` | `string` | `SqlJSONB` | `sql.NullString` |
+| `text[]` | `SqlStringArray` | `SqlStringArray` | `[]string` |
+| `integer[]` | `SqlInt32Array` | `SqlInt32Array` | `[]int32` |
+| `uuid[]` | `SqlUUIDArray` | `SqlUUIDArray` | `[]string` |
+| `vector` | `SqlVector` | `SqlVector` | `[]float32` |
+
+\* In resolvespec mode, NOT NULL timestamps use `SqlTimeStamp` (not `time.Time`) unless the base type is a simple integer or boolean. In stdlib mode, NOT NULL timestamps use `time.Time`.
+
+## Writer Options
+
+### NullableTypes
+
+Controls which Go package is used for nullable column types. Set via the `--types` CLI flag or `WriterOptions.NullableTypes`:
+
+```go
+// Use resolvespec types (default — omit NullableTypes or set to "resolvespec")
+options := &writers.WriterOptions{
+    OutputPath:    "models.go",
+    PackageName:   "models",
+    NullableTypes: writers.NullableTypeResolveSpec,
+}
+
+// Use standard library database/sql types
+options := &writers.WriterOptions{
+    OutputPath:    "models.go",
+    PackageName:   "models",
+    NullableTypes: writers.NullableTypeStdlib,
+}
+```
+
+### Metadata Options
+
+```go
+options := &writers.WriterOptions{
+    OutputPath:  "models.go",
+    PackageName: "models",
+    Metadata: map[string]any{
+        "multi_file":          true, // Enable multi-file mode
+        "populate_refs":       true, // Populate RefDatabase/RefSchema
+        "generate_get_id_str": true, // Generate GetIDStr() methods
+    },
+}
+```
 
 ## Notes
 
 - Model names are derived from table names (singularized, PascalCase)
 - Table aliases are auto-generated from table names
+- Nullable columns use `resolvespec_common.SqlString`, `resolvespec_common.SqlTimeStamp`, etc. by default; pass `--types stdlib` to use `sql.NullString`, `sql.NullTime`, etc. instead
+- Array columns use `resolvespec_common.SqlStringArray`, `resolvespec_common.SqlInt32Array`, etc. by default; `--types stdlib` produces plain Go slices (`[]string`, `[]int32`, …)
 - Multi-file mode: one file per table named `sql_{schema}_{table}.go`
 - Generated code is auto-formatted
 - JSON tags are automatically added

pkg/writers/bun/template_data.go

@@ -26,7 +26,10 @@ type ModelData struct {
 	Fields           []*FieldData
 	Config           *MethodConfig
 	PrimaryKeyField  string // Name of the primary key field
+	PrimaryKeyType   string // Go type of the primary key field
 	PrimaryKeyIsSQL  bool   // Whether PK uses SQL type (needs .Int64() call)
+	PrimaryKeyIsStr  bool   // Whether helper methods should use string IDs
+	PrimaryKeyIDType string // Helper method GetID/SetID/UpdateID type
 	IDColumnName     string // Name of the ID column in database
 	Prefix           string // 3-letter prefix
 }
@@ -140,7 +143,13 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper, fl
 			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.PrimaryKeyType = goType
 			model.PrimaryKeyIsSQL = strings.Contains(goType, "resolvespec_common") || strings.Contains(goType, "sql_types")
+			model.PrimaryKeyIsStr = isStringLikePrimaryKeyType(goType)
+			model.PrimaryKeyIDType = "int64"
+			if model.PrimaryKeyIsStr {
+				model.PrimaryKeyIDType = "string"
+			}
 			break
 		}
 	}
@@ -192,6 +201,15 @@ func formatComment(description, comment string) string {
 	return comment
 }
 
+func isStringLikePrimaryKeyType(goType string) bool {
+	switch goType {
+	case "string", "sql.NullString", "resolvespec_common.SqlString", "resolvespec_common.SqlUUID":
+		return true
+	default:
+		return false
+	}
+}
+
 // 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 {

pkg/writers/bun/templates.go

@@ -44,33 +44,55 @@ func (m {{.Name}}) SchemaName() string {
 {{end}}
 {{if and .Config.GenerateGetID .PrimaryKeyField}}
 // GetID returns the primary key value
-func (m {{.Name}}) GetID() int64 {
+func (m {{.Name}}) GetID() {{.PrimaryKeyIDType}} {
 	{{if .PrimaryKeyIsSQL -}}
+	{{if .PrimaryKeyIsStr -}}
+	return m.{{.PrimaryKeyField}}.String()
+	{{- else -}}
 	return m.{{.PrimaryKeyField}}.Int64()
+	{{- end}}
+	{{- else -}}
+	{{if .PrimaryKeyIsStr -}}
+	return m.{{.PrimaryKeyField}}
 	{{- else -}}
 	return int64(m.{{.PrimaryKeyField}})
 	{{- end}}
+	{{- end}}
 }
 {{end}}
 {{if and .Config.GenerateGetIDStr .PrimaryKeyField}}
 // GetIDStr returns the primary key as a string
 func (m {{.Name}}) GetIDStr() string {
+	{{if .PrimaryKeyIsSQL -}}
+	return m.{{.PrimaryKeyField}}.String()
+	{{- else if .PrimaryKeyIsStr -}}
+	return m.{{.PrimaryKeyField}}
+	{{- else -}}
 	return fmt.Sprintf("%d", m.{{.PrimaryKeyField}})
+	{{- end}}
 }
 {{end}}
 {{if and .Config.GenerateSetID .PrimaryKeyField}}
 // SetID sets the primary key value
-func (m {{.Name}}) SetID(newid int64) {
+func (m {{.Name}}) SetID(newid {{.PrimaryKeyIDType}}) {
 	m.UpdateID(newid)
 }
 {{end}}
 {{if and .Config.GenerateUpdateID .PrimaryKeyField}}
 // UpdateID updates the primary key value
-func (m *{{.Name}}) UpdateID(newid int64) {
+func (m *{{.Name}}) UpdateID(newid {{.PrimaryKeyIDType}}) {
 	{{if .PrimaryKeyIsSQL -}}
-	m.{{.PrimaryKeyField}}.FromString(fmt.Sprintf("%d", newid))
+	{{if .PrimaryKeyIsStr -}}
+	m.{{.PrimaryKeyField}}.FromString(newid)
 	{{- else -}}
-	m.{{.PrimaryKeyField}} = int32(newid)
+	m.{{.PrimaryKeyField}}.FromString(fmt.Sprintf("%d", newid))
+	{{- end}}
+	{{- else -}}
+	{{if .PrimaryKeyIsStr -}}
+	m.{{.PrimaryKeyField}} = newid
+	{{- else -}}
+	m.{{.PrimaryKeyField}} = {{.PrimaryKeyType}}(newid)
+	{{- end}}
 	{{- end}}
 }
 {{end}}

pkg/writers/bun/type_mapper.go

@@ -11,30 +11,43 @@ import (
 
 // TypeMapper handles type conversions between SQL and Go types for Bun
 type TypeMapper struct {
-	// Package alias for sql_types import
 	sqlTypesAlias string
+	typeStyle     string // writers.NullableTypeResolveSpec | writers.NullableTypeStdlib
 }
 
-// NewTypeMapper creates a new TypeMapper with default settings
+// NewTypeMapper creates a new TypeMapper.
-func NewTypeMapper() *TypeMapper {
+// typeStyle should be writers.NullableTypeResolveSpec or writers.NullableTypeStdlib;
+// an empty string defaults to resolvespec.
+func NewTypeMapper(typeStyle string) *TypeMapper {
+	if typeStyle == "" {
+		typeStyle = writers.NullableTypeResolveSpec
+	}
 	return &TypeMapper{
 		sqlTypesAlias: "resolvespec_common",
+		typeStyle:     typeStyle,
 	}
 }
 
-// SQLTypeToGoType converts a SQL type to its Go equivalent
+// SQLTypeToGoType converts a SQL type to its Go equivalent.
-// Uses ResolveSpec common package types (all are nullable by default in Bun)
 func (tm *TypeMapper) SQLTypeToGoType(sqlType string, notNull bool) string {
-	// Normalize SQL type (lowercase, remove length/precision)
+	// Array types are handled separately for both styles.
+	if pgsql.IsArrayType(sqlType) {
+		return tm.arrayGoType(tm.extractBaseType(sqlType))
+	}
+
 	baseType := tm.extractBaseType(sqlType)
 
-	// For Bun, we typically use resolvespec_common types for most fields
+	if tm.typeStyle == writers.NullableTypeStdlib {
-	// unless they're explicitly NOT NULL and we want to avoid null handling
+		if notNull {
+			return tm.rawGoType(baseType)
+		}
+		return tm.stdlibNullableGoType(baseType)
+	}
+
+	// resolvespec (default): use base Go types only for simple NOT NULL fields.
 	if notNull && tm.isSimpleType(baseType) {
 		return tm.baseGoType(baseType)
 	}
-
-	// Use resolvespec_common types for nullable fields
 	return tm.bunGoType(baseType)
 }
 
@@ -154,6 +167,9 @@ func (tm *TypeMapper) bunGoType(sqlType string) string {
 
 		// Other
 		"money": tm.sqlTypesAlias + ".SqlFloat64",
+
+		// pgvector
+		"vector": tm.sqlTypesAlias + ".SqlVector",
 	}
 
 	if goType, ok := typeMap[sqlType]; ok {
@@ -164,6 +180,123 @@ func (tm *TypeMapper) bunGoType(sqlType string) string {
 	return tm.sqlTypesAlias + ".SqlString"
 }
 
+// arrayGoType returns the Go type for a PostgreSQL array column.
+// The baseElemType is the canonical base type (e.g. "text", "integer").
+func (tm *TypeMapper) arrayGoType(baseElemType string) string {
+	if tm.typeStyle == writers.NullableTypeStdlib {
+		return tm.stdlibArrayGoType(baseElemType)
+	}
+	typeMap := map[string]string{
+		"text": tm.sqlTypesAlias + ".SqlStringArray", "varchar": tm.sqlTypesAlias + ".SqlStringArray",
+		"char": tm.sqlTypesAlias + ".SqlStringArray", "character": tm.sqlTypesAlias + ".SqlStringArray",
+		"citext": tm.sqlTypesAlias + ".SqlStringArray", "bpchar": tm.sqlTypesAlias + ".SqlStringArray",
+		"inet": tm.sqlTypesAlias + ".SqlStringArray", "cidr": tm.sqlTypesAlias + ".SqlStringArray",
+		"macaddr": tm.sqlTypesAlias + ".SqlStringArray",
+		"json":    tm.sqlTypesAlias + ".SqlStringArray", "jsonb": tm.sqlTypesAlias + ".SqlStringArray",
+		"integer": tm.sqlTypesAlias + ".SqlInt32Array", "int": tm.sqlTypesAlias + ".SqlInt32Array",
+		"int4": tm.sqlTypesAlias + ".SqlInt32Array", "serial": tm.sqlTypesAlias + ".SqlInt32Array",
+		"smallint": tm.sqlTypesAlias + ".SqlInt16Array", "int2": tm.sqlTypesAlias + ".SqlInt16Array",
+		"smallserial": tm.sqlTypesAlias + ".SqlInt16Array",
+		"bigint":      tm.sqlTypesAlias + ".SqlInt64Array", "int8": tm.sqlTypesAlias + ".SqlInt64Array",
+		"bigserial": tm.sqlTypesAlias + ".SqlInt64Array",
+		"real":      tm.sqlTypesAlias + ".SqlFloat32Array", "float4": tm.sqlTypesAlias + ".SqlFloat32Array",
+		"double precision": tm.sqlTypesAlias + ".SqlFloat64Array", "float8": tm.sqlTypesAlias + ".SqlFloat64Array",
+		"numeric": tm.sqlTypesAlias + ".SqlFloat64Array", "decimal": tm.sqlTypesAlias + ".SqlFloat64Array",
+		"money":   tm.sqlTypesAlias + ".SqlFloat64Array",
+		"boolean": tm.sqlTypesAlias + ".SqlBoolArray", "bool": tm.sqlTypesAlias + ".SqlBoolArray",
+		"uuid": tm.sqlTypesAlias + ".SqlUUIDArray",
+	}
+	if goType, ok := typeMap[baseElemType]; ok {
+		return goType
+	}
+	return tm.sqlTypesAlias + ".SqlStringArray"
+}
+
+// rawGoType returns the plain Go type for a NOT NULL column in stdlib mode.
+func (tm *TypeMapper) rawGoType(sqlType string) string {
+	typeMap := map[string]string{
+		"integer": "int32", "int": "int32", "int4": "int32", "serial": "int32",
+		"smallint": "int16", "int2": "int16", "smallserial": "int16",
+		"bigint": "int64", "int8": "int64", "bigserial": "int64",
+		"boolean": "bool", "bool": "bool",
+		"real": "float32", "float4": "float32",
+		"double precision": "float64", "float8": "float64",
+		"numeric": "float64", "decimal": "float64", "money": "float64",
+		"text": "string", "varchar": "string", "char": "string",
+		"character": "string", "citext": "string", "bpchar": "string",
+		"inet": "string", "cidr": "string", "macaddr": "string",
+		"uuid": "string", "json": "string", "jsonb": "string",
+		"timestamp":                   "time.Time",
+		"timestamp without time zone": "time.Time",
+		"timestamp with time zone":    "time.Time",
+		"timestamptz":                 "time.Time",
+		"date":                        "time.Time",
+		"time":                        "time.Time",
+		"time without time zone":      "time.Time",
+		"time with time zone":         "time.Time",
+		"timetz":                      "time.Time",
+		"bytea":                       "[]byte",
+		"vector":                      "[]float32",
+	}
+	if goType, ok := typeMap[sqlType]; ok {
+		return goType
+	}
+	return "string"
+}
+
+// stdlibNullableGoType returns the database/sql nullable type for a column.
+func (tm *TypeMapper) stdlibNullableGoType(sqlType string) string {
+	typeMap := map[string]string{
+		"integer": "sql.NullInt32", "int": "sql.NullInt32", "int4": "sql.NullInt32", "serial": "sql.NullInt32",
+		"smallint": "sql.NullInt16", "int2": "sql.NullInt16", "smallserial": "sql.NullInt16",
+		"bigint": "sql.NullInt64", "int8": "sql.NullInt64", "bigserial": "sql.NullInt64",
+		"boolean": "sql.NullBool", "bool": "sql.NullBool",
+		"real": "sql.NullFloat64", "float4": "sql.NullFloat64",
+		"double precision": "sql.NullFloat64", "float8": "sql.NullFloat64",
+		"numeric": "sql.NullFloat64", "decimal": "sql.NullFloat64", "money": "sql.NullFloat64",
+		"text": "sql.NullString", "varchar": "sql.NullString", "char": "sql.NullString",
+		"character": "sql.NullString", "citext": "sql.NullString", "bpchar": "sql.NullString",
+		"inet": "sql.NullString", "cidr": "sql.NullString", "macaddr": "sql.NullString",
+		"uuid": "sql.NullString", "json": "sql.NullString", "jsonb": "sql.NullString",
+		"timestamp":                   "sql.NullTime",
+		"timestamp without time zone": "sql.NullTime",
+		"timestamp with time zone":    "sql.NullTime",
+		"timestamptz":                 "sql.NullTime",
+		"date":                        "sql.NullTime",
+		"time":                        "sql.NullTime",
+		"time without time zone":      "sql.NullTime",
+		"time with time zone":         "sql.NullTime",
+		"timetz":                      "sql.NullTime",
+		"bytea":                       "[]byte",
+		"vector":                      "[]float32",
+	}
+	if goType, ok := typeMap[sqlType]; ok {
+		return goType
+	}
+	return "sql.NullString"
+}
+
+// stdlibArrayGoType returns a plain Go slice type for array columns in stdlib mode.
+func (tm *TypeMapper) stdlibArrayGoType(baseElemType string) string {
+	typeMap := map[string]string{
+		"text": "[]string", "varchar": "[]string", "char": "[]string",
+		"character": "[]string", "citext": "[]string", "bpchar": "[]string",
+		"inet": "[]string", "cidr": "[]string", "macaddr": "[]string",
+		"uuid": "[]string", "json": "[]string", "jsonb": "[]string",
+		"integer": "[]int32", "int": "[]int32", "int4": "[]int32", "serial": "[]int32",
+		"smallint": "[]int16", "int2": "[]int16", "smallserial": "[]int16",
+		"bigint": "[]int64", "int8": "[]int64", "bigserial": "[]int64",
+		"real": "[]float32", "float4": "[]float32",
+		"double precision": "[]float64", "float8": "[]float64",
+		"numeric": "[]float64", "decimal": "[]float64", "money": "[]float64",
+		"boolean": "[]bool", "bool": "[]bool",
+	}
+	if goType, ok := typeMap[baseElemType]; ok {
+		return goType
+	}
+	return "[]string"
+}
+
 // BuildBunTag generates a complete Bun tag string for a column
 // Bun format: bun:"column_name,type:type_name,pk,default:value"
 func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) string {
@@ -178,10 +311,11 @@ func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) st
 	if column.Type != "" {
 		// Sanitize type to remove backticks
 		typeStr := writers.SanitizeStructTagValue(column.Type)
+		isArray := pgsql.IsArrayType(typeStr)
 		hasExplicitTypeModifier := pgsql.HasExplicitTypeModifier(typeStr)
-		if !hasExplicitTypeModifier && column.Length > 0 {
+		if !hasExplicitTypeModifier && !isArray && column.Length > 0 {
 			typeStr = fmt.Sprintf("%s(%d)", typeStr, column.Length)
-		} else if !hasExplicitTypeModifier && column.Precision > 0 {
+		} else if !hasExplicitTypeModifier && !isArray && column.Precision > 0 {
 			if column.Scale > 0 {
 				typeStr = fmt.Sprintf("%s(%d,%d)", typeStr, column.Precision, column.Scale)
 			} else {
@@ -189,6 +323,9 @@ func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) st
 			}
 		}
 		parts = append(parts, fmt.Sprintf("type:%s", typeStr))
+		if isArray && tm.typeStyle == writers.NullableTypeStdlib {
+			parts = append(parts, "array")
+		}
 	}
 
 	// Primary key
@@ -286,11 +423,20 @@ func (tm *TypeMapper) NeedsFmtImport(generateGetIDStr bool) bool {
 	return generateGetIDStr
 }
 
-// GetSQLTypesImport returns the import path for sql_types (ResolveSpec common)
+// GetSQLTypesImport returns the import path for the ResolveSpec spectypes package.
 func (tm *TypeMapper) GetSQLTypesImport() string {
 	return "github.com/bitechdev/ResolveSpec/pkg/spectypes"
 }
 
+// GetNullableTypeImportLine returns the full Go import line for the nullable type
+// package (ready to pass to AddImport). Returns empty string when no import is needed.
+func (tm *TypeMapper) GetNullableTypeImportLine() string {
+	if tm.typeStyle == writers.NullableTypeStdlib {
+		return "\"database/sql\""
+	}
+	return fmt.Sprintf("%s \"%s\"", tm.sqlTypesAlias, tm.GetSQLTypesImport())
+}
+
 // GetBunImport returns the import path for Bun
 func (tm *TypeMapper) GetBunImport() string {
 	return "github.com/uptrace/bun"

pkg/writers/bun/writer.go

@@ -24,7 +24,7 @@ type Writer struct {
 func NewWriter(options *writers.WriterOptions) *Writer {
 	w := &Writer{
 		options:    options,
-		typeMapper: NewTypeMapper(),
+		typeMapper: NewTypeMapper(options.NullableTypes),
 		config:     LoadMethodConfigFromMetadata(options.Metadata),
 	}
 
@@ -80,8 +80,8 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 	// Add bun import (always needed)
 	templateData.AddImport(fmt.Sprintf("\"%s\"", w.typeMapper.GetBunImport()))
 
-	// Add resolvespec_common import (always needed for nullable types)
+	// Add nullable types import (resolvespec or stdlib depending on options)
-	templateData.AddImport(fmt.Sprintf("resolvespec_common \"%s\"", w.typeMapper.GetSQLTypesImport()))
+	templateData.AddImport(w.typeMapper.GetNullableTypeImportLine())
 
 	// Collect all models
 	for _, schema := range db.Schemas {
@@ -102,8 +102,8 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 		}
 	}
 
-	// Add fmt import if GetIDStr is enabled
+	// Add fmt import when generated helper methods need string formatting.
-	if w.config.GenerateGetIDStr {
+	if w.needsFmtImport(templateData.Models) {
 		templateData.AddImport("\"fmt\"")
 	}
 
@@ -177,8 +177,8 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 			// Add bun import
 			templateData.AddImport(fmt.Sprintf("\"%s\"", w.typeMapper.GetBunImport()))
 
-			// Add resolvespec_common import
+			// Add nullable types import (resolvespec or stdlib depending on options)
-			templateData.AddImport(fmt.Sprintf("resolvespec_common \"%s\"", w.typeMapper.GetSQLTypesImport()))
+			templateData.AddImport(w.typeMapper.GetNullableTypeImportLine())
 
 			// Create model data
 			modelData := NewModelData(table, schema.Name, w.typeMapper, w.options.FlattenSchema)
@@ -195,8 +195,8 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 				}
 			}
 
-			// Add fmt import if GetIDStr is enabled
+			// Add fmt import when generated helper methods need string formatting.
-			if w.config.GenerateGetIDStr {
+			if w.needsFmtImport(templateData.Models) {
 				templateData.AddImport("\"fmt\"")
 			}
 
@@ -301,6 +301,26 @@ func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table
 	}
 }
 
+func (w *Writer) needsFmtImport(models []*ModelData) bool {
+	if w.config.GenerateGetIDStr {
+		for _, model := range models {
+			if model.PrimaryKeyField != "" && !model.PrimaryKeyIsSQL && !model.PrimaryKeyIsStr {
+				return true
+			}
+		}
+	}
+
+	if w.config.GenerateUpdateID {
+		for _, model := range models {
+			if model.PrimaryKeyField != "" && model.PrimaryKeyIsSQL && !model.PrimaryKeyIsStr {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
 // findTable finds a table by schema and name in the database
 func (w *Writer) findTable(schemaName, tableName string, db *models.Database) *models.Table {
 	for _, schema := range db.Schemas {

pkg/writers/bun/writer_test.go

@@ -556,7 +556,7 @@ func TestWriter_FieldNameCollision(t *testing.T) {
 }
 
 func TestTypeMapper_SQLTypeToGoType_Bun(t *testing.T) {
-	mapper := NewTypeMapper()
+	mapper := NewTypeMapper("")
 
 	tests := []struct {
 		sqlType string
@@ -574,6 +574,10 @@ func TestTypeMapper_SQLTypeToGoType_Bun(t *testing.T) {
 		{"boolean", false, "resolvespec_common.SqlBool"},
 		{"uuid", false, "resolvespec_common.SqlUUID"},
 		{"jsonb", false, "resolvespec_common.SqlJSONB"},
+		{"text[]", true, "resolvespec_common.SqlStringArray"},
+		{"text[]", false, "resolvespec_common.SqlStringArray"},
+		{"integer[]", true, "resolvespec_common.SqlInt32Array"},
+		{"bigint[]", false, "resolvespec_common.SqlInt64Array"},
 	}
 
 	for _, tt := range tests {
@@ -586,8 +590,118 @@ func TestTypeMapper_SQLTypeToGoType_Bun(t *testing.T) {
 	}
 }
 
+func TestWriter_UpdateIDTypeSafety_Bun(t *testing.T) {
+	tests := []struct {
+		name         string
+		pkType       string
+		expectedPK   string
+		expectedLine string
+		forbidInt32  bool
+	}{
+		{"int32_pk", "int", "int32", "m.ID = int32(newid)", false},
+		{"sql_int16_pk", "smallint", "resolvespec_common.SqlInt16", "m.ID.FromString(fmt.Sprintf(\"%d\", newid))", true},
+		{"int64_pk", "bigint", "int64", "m.ID = int64(newid)", true},
+	}
+
+	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)
+
+			if !strings.Contains(generated, tt.expectedLine) {
+				t.Errorf("Expected UpdateID to include %s\nGenerated:\n%s", tt.expectedLine, generated)
+			}
+
+			if !strings.Contains(generated, "ID            "+tt.expectedPK) {
+				t.Errorf("Expected generated primary key field type %s\nGenerated:\n%s", tt.expectedPK, generated)
+			}
+
+			if tt.forbidInt32 && strings.Contains(generated, "int32(newid)") {
+				t.Errorf("UpdateID should not cast to int32 for %s type\nGenerated:\n%s", tt.pkType, generated)
+			}
+
+			if !strings.Contains(generated, "UpdateID(newid int64)") {
+				t.Errorf("UpdateID should accept int64 parameter\nGenerated:\n%s", generated)
+			}
+		})
+	}
+}
+
+func TestWriter_StringPrimaryKeyHelpers_Bun(t *testing.T) {
+	table := models.InitTable("accounts", "public")
+	table.Columns["id"] = &models.Column{
+		Name:         "id",
+		Type:         "uuid",
+		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)
+
+	expectations := []string{
+		"resolvespec_common.SqlUUID",
+		"func (m ModelPublicAccounts) GetID() string",
+		"return m.ID.String()",
+		"func (m ModelPublicAccounts) GetIDStr() string",
+		"func (m ModelPublicAccounts) SetID(newid string)",
+		"func (m *ModelPublicAccounts) UpdateID(newid string)",
+		"m.ID.FromString(newid)",
+	}
+
+	for _, expected := range expectations {
+		if !strings.Contains(generated, expected) {
+			t.Errorf("Generated code missing expected content: %q\nGenerated:\n%s", expected, generated)
+		}
+	}
+
+	if strings.Contains(generated, "GetID() int64") || strings.Contains(generated, "UpdateID(newid int64)") {
+		t.Errorf("String primary keys should not use int64 helper signatures\nGenerated:\n%s", generated)
+	}
+}
+
 func TestTypeMapper_BuildBunTag(t *testing.T) {
-	mapper := NewTypeMapper()
+	mapper := NewTypeMapper("")
 
 	tests := []struct {
 		name   string
@@ -685,6 +799,24 @@ func TestTypeMapper_BuildBunTag(t *testing.T) {
 			},
 			want: []string{"id,", "type:bigserial,", "pk,", "autoincrement,"},
 		},
+		{
+			name: "text array type",
+			column: &models.Column{
+				Name:    "tags",
+				Type:    "text[]",
+				NotNull: false,
+			},
+			want: []string{"tags,", "type:text[],"},
+		},
+		{
+			name: "integer array type",
+			column: &models.Column{
+				Name:    "scores",
+				Type:    "integer[]",
+				NotNull: true,
+			},
+			want: []string{"scores,", "type:integer[],"},
+		},
 	}
 
 	for _, tt := range tests {
@@ -695,12 +827,36 @@ func TestTypeMapper_BuildBunTag(t *testing.T) {
 					t.Errorf("BuildBunTag() = %q, missing %q", result, part)
 				}
 			}
+			// resolvespec mode must NOT add "array" — SqlXxxArray uses sql.Scanner
+			if strings.Contains(result, ",array,") || strings.HasSuffix(result, ",array,") {
+				t.Errorf("BuildBunTag() = %q, must not contain 'array' in resolvespec mode", result)
+			}
+		})
+	}
+}
+
+func TestTypeMapper_BuildBunTag_StdlibArrayHasArrayTag(t *testing.T) {
+	mapper := NewTypeMapper(writers.NullableTypeStdlib)
+
+	cases := []struct {
+		name   string
+		column *models.Column
+	}{
+		{name: "text array", column: &models.Column{Name: "tags", Type: "text[]"}},
+		{name: "integer array", column: &models.Column{Name: "scores", Type: "integer[]", NotNull: true}},
+	}
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			result := mapper.BuildBunTag(tt.column, nil)
+			if !strings.Contains(result, "array") {
+				t.Errorf("BuildBunTag() = %q, expected 'array' in stdlib mode", result)
+			}
 		})
 	}
 }
 
 func TestTypeMapper_BuildBunTag_PreservesExplicitTypeModifiers(t *testing.T) {
-	mapper := NewTypeMapper()
+	mapper := NewTypeMapper("")
 
 	col := &models.Column{
 		Name:      "embedding",

pkg/writers/gorm/README.md

@@ -48,22 +48,23 @@ func main() {
 ### CLI Examples
 
 ```bash
-# Generate GORM models from PostgreSQL database (single file)
+# Generate GORM models from a DBML schema (default: resolvespec types)
-relspec --input pgsql \
+relspec convert --from dbml --from-path schema.dbml \
-  --conn "postgres://localhost/mydb" \
+  --to gorm --to-path models.go --package models
-  --output gorm \
-  --out-file models.go \
-  --package models
 
-# Generate GORM models with multi-file output (one file per table)
+# Use standard library database/sql nullable types instead of resolvespec
-relspec --input json \
+relspec convert --from dbml --from-path schema.dbml \
-  --in-file schema.json \
+  --to gorm --to-path models.go --package models \
-  --output gorm \
+  --types stdlib
-  --out-file models/ \
-  --package models
 
-# Convert DBML to GORM models
+# Explicitly select resolvespec types (same as omitting --types)
-relspec --input dbml --in-file schema.dbml --output gorm --out-file models.go
+relspec convert --from pgsql --from-conn "postgres://localhost/mydb" \
+  --to gorm --to-path models.go --package models \
+  --types resolvespec
+
+# Multi-file output (one file per table)
+relspec convert --from json --from-path schema.json \
+  --to gorm --to-path models/ --package models
 ```
 
 ## Output Modes
@@ -86,56 +87,84 @@ relspec --input pgsql --conn "..." --output gorm --out-file models/
 
 Files are named: `sql_{schema}_{table}.go`
 
-## Generated Code Example
+## Generated Code Examples
+
+### Default — resolvespec types (`--types resolvespec`)
 
 ```go
 package models
 
 import (
-    "time"
+    sql_types "github.com/bitechdev/ResolveSpec/pkg/spectypes"
-    sql_types "git.warky.dev/wdevs/sql_types"
 )
 
 type ModelUser struct {
-    ID        int64                `gorm:"column:id;type:bigint;primaryKey;autoIncrement" json:"id"`
+    ID        string                      `gorm:"column:id;type:uuid;primaryKey" json:"id"`
-    Username  string               `gorm:"column:username;type:varchar(50);not null;uniqueIndex" json:"username"`
+    Username  string                      `gorm:"column:username;type:text;not null" json:"username"`
-    Email     string               `gorm:"column:email;type:varchar(100);not null" json:"email"`
+    Email     sql_types.SqlString         `gorm:"column:email;type:text" json:"email,omitempty"`
-    CreatedAt time.Time            `gorm:"column:created_at;type:timestamp;not null;default:now()" json:"created_at"`
+    Tags      sql_types.SqlStringArray    `gorm:"column:tags;type:text[];not null;default:'{}'" json:"tags"`
-
+    CreatedAt sql_types.SqlTimeStamp      `gorm:"column:created_at;type:timestamptz;not null;default:now()" json:"created_at"`
-    // Relationships
-    Pos []*ModelPost `gorm:"foreignKey:UserID;references:ID;constraint:OnDelete:CASCADE" json:"pos,omitempty"`
 }
 
 func (ModelUser) TableName() string {
     return "public.users"
 }
+```
 
-type ModelPost struct {
+### Standard library — `--types stdlib`
-    ID        int64           `gorm:"column:id;type:bigint;primaryKey" json:"id"`
-    UserID    int64           `gorm:"column:user_id;type:bigint;not null" json:"user_id"`
-    Title     string          `gorm:"column:title;type:varchar(200);not null" json:"title"`
-    Content   sql_types.SqlString `gorm:"column:content;type:text" json:"content,omitempty"`
 
-    // Belongs to
+```go
-    Use *ModelUser `gorm:"foreignKey:UserID;references:ID" json:"use,omitempty"`
+package models
+
+import (
+    "database/sql"
+    "time"
+)
+
+type ModelUser struct {
+    ID        string         `gorm:"column:id;type:uuid;primaryKey" json:"id"`
+    Username  string         `gorm:"column:username;type:text;not null" json:"username"`
+    Email     sql.NullString `gorm:"column:email;type:text" json:"email,omitempty"`
+    Tags      []string       `gorm:"column:tags;type:text[];not null;default:'{}'" json:"tags"`
+    CreatedAt time.Time      `gorm:"column:created_at;type:timestamptz;not null;default:now()" json:"created_at"`
 }
 
-func (ModelPost) TableName() string {
+func (ModelUser) TableName() string {
-    return "public.posts"
+    return "public.users"
 }
 ```
 
 ## Writer Options
 
+### NullableTypes
+
+Controls which Go package is used for nullable column types. Set via the `--types` CLI flag or `WriterOptions.NullableTypes`:
+
+```go
+// Use resolvespec types (default — omit NullableTypes or set to "resolvespec")
+options := &writers.WriterOptions{
+    OutputPath:    "models.go",
+    PackageName:   "models",
+    NullableTypes: writers.NullableTypeResolveSpec,
+}
+
+// Use standard library database/sql types
+options := &writers.WriterOptions{
+    OutputPath:    "models.go",
+    PackageName:   "models",
+    NullableTypes: writers.NullableTypeStdlib,
+}
+```
+
 ### Metadata Options
 
-Configure the writer behavior using metadata in `WriterOptions`:
+Configure additional writer behavior using metadata in `WriterOptions`:
 
 ```go
 options := &writers.WriterOptions{
     OutputPath:  "models.go",
     PackageName: "models",
-    Metadata: map[string]interface{}{
+    Metadata: map[string]any{
         "multi_file":          true, // Enable multi-file mode
         "populate_refs":       true, // Populate RefDatabase/RefSchema
         "generate_get_id_str": true, // Generate GetIDStr() methods
@@ -145,18 +174,23 @@ options := &writers.WriterOptions{
 
 ## Type Mapping
 
-| SQL Type | Go Type | Notes |
+The nullable type package is selected with `--types` (or `WriterOptions.NullableTypes`).
-|----------|---------|-------|
+
-| bigint, int8 | int64 | - |
+| SQL Type | NOT NULL — both | Nullable — resolvespec | Nullable — stdlib |
-| integer, int, int4 | int | - |
+|---|---|---|---|
-| smallint, int2 | int16 | - |
+| `bigint` | `int64` | `SqlInt64` | `sql.NullInt64` |
-| varchar, text | string | Not nullable |
+| `integer` | `int32` | `SqlInt32` | `sql.NullInt32` |
-| varchar, text (nullable) | sql_types.SqlString | Nullable |
+| `smallint` | `int16` | `SqlInt16` | `sql.NullInt16` |
-| boolean, bool | bool | - |
+| `text`, `varchar` | `string` | `SqlString` | `sql.NullString` |
-| timestamp, timestamptz | time.Time | - |
+| `boolean` | `bool` | `SqlBool` | `sql.NullBool` |
-| numeric, decimal | float64 | - |
+| `timestamp`, `timestamptz` | `time.Time` | `SqlTimeStamp` | `sql.NullTime` |
-| uuid | string | - |
+| `numeric`, `decimal` | `float64` | `SqlFloat64` | `sql.NullFloat64` |
-| json, jsonb | string | - |
+| `uuid` | `string` | `SqlUUID` | `sql.NullString` |
+| `jsonb` | `string` | `SqlString` | `sql.NullString` |
+| `text[]` | `SqlStringArray` | `SqlStringArray` | `[]string` |
+| `integer[]` | `SqlInt32Array` | `SqlInt32Array` | `[]int32` |
+| `uuid[]` | `SqlUUIDArray` | `SqlUUIDArray` | `[]string` |
+| `vector` | `SqlVector` | `SqlVector` | `[]float32` |
 
 ## Relationship Generation
 
@@ -170,7 +204,8 @@ The writer automatically generates relationship fields:
 ## Notes
 
 - Model names are prefixed with "Model" (e.g., `ModelUser`)
-- Nullable columns use `sql_types.SqlString`, `sql_types.SqlInt64`, etc.
+- Nullable columns use `sql_types.SqlString`, `sql_types.SqlInt64`, etc. by default; pass `--types stdlib` to use `sql.NullString`, `sql.NullInt64`, etc. instead
+- Array columns use `sql_types.SqlStringArray`, `sql_types.SqlInt32Array`, etc. by default; `--types stdlib` produces plain Go slices (`[]string`, `[]int32`, …)
 - Generated code is auto-formatted with `go fmt`
 - JSON tags are automatically added
 - Supports schema-qualified table names in `TableName()` method

pkg/writers/gorm/template_data.go

@@ -2,6 +2,7 @@ package gorm
 
 import (
 	"sort"
+	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
@@ -26,6 +27,9 @@ type ModelData struct {
 	Config           *MethodConfig
 	PrimaryKeyField  string // Name of the primary key field
 	PrimaryKeyType   string // Go type of the primary key field
+	PrimaryKeyIsSQL  bool   // Whether PK uses a SQL wrapper type
+	PrimaryKeyIsStr  bool   // Whether helper methods should use string IDs
+	PrimaryKeyIDType string // Helper method GetID/SetID/UpdateID type
 	IDColumnName     string // Name of the ID column in database
 	Prefix           string // 3-letter prefix
 }
@@ -136,7 +140,14 @@ func NewModelData(table *models.Table, schema string, typeMapper *TypeMapper, fl
 			// Sanitize column name to remove backticks
 			safeName := writers.SanitizeStructTagValue(col.Name)
 			model.PrimaryKeyField = SnakeCaseToPascalCase(safeName)
-			model.PrimaryKeyType = typeMapper.SQLTypeToGoType(col.Type, col.NotNull)
+			goType := typeMapper.SQLTypeToGoType(col.Type, col.NotNull)
+			model.PrimaryKeyType = goType
+			model.PrimaryKeyIsSQL = strings.Contains(goType, "sql_types.") || strings.Contains(goType, "sql.")
+			model.PrimaryKeyIsStr = isStringLikePrimaryKeyType(goType)
+			model.PrimaryKeyIDType = "int64"
+			if model.PrimaryKeyIsStr {
+				model.PrimaryKeyIDType = "string"
+			}
 			model.IDColumnName = safeName
 			break
 		}
@@ -189,6 +200,15 @@ func formatComment(description, comment string) string {
 	return comment
 }
 
+func isStringLikePrimaryKeyType(goType string) bool {
+	switch goType {
+	case "string", "sql.NullString", "sql_types.SqlString", "sql_types.SqlUUID":
+		return true
+	default:
+		return false
+	}
+}
+
 // 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 {

pkg/writers/gorm/templates.go

@@ -43,26 +43,56 @@ func (m {{.Name}}) SchemaName() string {
 {{end}}
 {{if and .Config.GenerateGetID .PrimaryKeyField}}
 // GetID returns the primary key value
-func (m {{.Name}}) GetID() int64 {
+func (m {{.Name}}) GetID() {{.PrimaryKeyIDType}} {
+	{{if .PrimaryKeyIsSQL -}}
+	{{if .PrimaryKeyIsStr -}}
+	return m.{{.PrimaryKeyField}}.String()
+	{{- else -}}
+	return m.{{.PrimaryKeyField}}.Int64()
+	{{- end}}
+	{{- else -}}
+	{{if .PrimaryKeyIsStr -}}
+	return m.{{.PrimaryKeyField}}
+	{{- else -}}
 	return int64(m.{{.PrimaryKeyField}})
+	{{- end}}
+	{{- end}}
 }
 {{end}}
 {{if and .Config.GenerateGetIDStr .PrimaryKeyField}}
 // GetIDStr returns the primary key as a string
 func (m {{.Name}}) GetIDStr() string {
+	{{if .PrimaryKeyIsSQL -}}
+	return m.{{.PrimaryKeyField}}.String()
+	{{- else if .PrimaryKeyIsStr -}}
+	return m.{{.PrimaryKeyField}}
+	{{- else -}}
 	return fmt.Sprintf("%d", m.{{.PrimaryKeyField}})
+	{{- end}}
 }
 {{end}}
 {{if and .Config.GenerateSetID .PrimaryKeyField}}
 // SetID sets the primary key value
-func (m {{.Name}}) SetID(newid int64) {
+func (m {{.Name}}) SetID(newid {{.PrimaryKeyIDType}}) {
 	m.UpdateID(newid)
 }
 {{end}}
 {{if and .Config.GenerateUpdateID .PrimaryKeyField}}
 // UpdateID updates the primary key value
-func (m *{{.Name}}) UpdateID(newid int64) {
+func (m *{{.Name}}) UpdateID(newid {{.PrimaryKeyIDType}}) {
+	{{if .PrimaryKeyIsSQL -}}
+	{{if .PrimaryKeyIsStr -}}
+	m.{{.PrimaryKeyField}}.FromString(newid)
+	{{- else -}}
+	m.{{.PrimaryKeyField}}.FromString(fmt.Sprintf("%d", newid))
+	{{- end}}
+	{{- else -}}
+	{{if .PrimaryKeyIsStr -}}
+	m.{{.PrimaryKeyField}} = newid
+	{{- else -}}
 	m.{{.PrimaryKeyField}} = {{.PrimaryKeyType}}(newid)
+	{{- end}}
+	{{- end}}
 }
 {{end}}
 {{if and .Config.GenerateGetIDName .IDColumnName}}

pkg/writers/gorm/type_mapper.go

@@ -11,29 +11,43 @@ import (
 
 // TypeMapper handles type conversions between SQL and Go types
 type TypeMapper struct {
-	// Package alias for sql_types import
 	sqlTypesAlias string
+	typeStyle     string // writers.NullableTypeResolveSpec | writers.NullableTypeStdlib
 }
 
-// NewTypeMapper creates a new TypeMapper with default settings
+// NewTypeMapper creates a new TypeMapper.
-func NewTypeMapper() *TypeMapper {
+// typeStyle should be writers.NullableTypeResolveSpec or writers.NullableTypeStdlib;
+// an empty string defaults to resolvespec.
+func NewTypeMapper(typeStyle string) *TypeMapper {
+	if typeStyle == "" {
+		typeStyle = writers.NullableTypeResolveSpec
+	}
 	return &TypeMapper{
 		sqlTypesAlias: "sql_types",
+		typeStyle:     typeStyle,
 	}
 }
 
-// SQLTypeToGoType converts a SQL type to its Go equivalent
+// SQLTypeToGoType converts a SQL type to its Go equivalent.
-// Handles nullable types using ResolveSpec sql_types package
 func (tm *TypeMapper) SQLTypeToGoType(sqlType string, notNull bool) string {
-	// Normalize SQL type (lowercase, remove length/precision)
+	// Array types are handled separately for both styles.
+	if pgsql.IsArrayType(sqlType) {
+		return tm.arrayGoType(tm.extractBaseType(sqlType))
+	}
+
 	baseType := tm.extractBaseType(sqlType)
 
-	// If not null, use base Go types
+	if tm.typeStyle == writers.NullableTypeStdlib {
+		if notNull {
+			return tm.rawGoType(baseType)
+		}
+		return tm.stdlibNullableGoType(baseType)
+	}
+
+	// resolvespec (default)
 	if notNull {
 		return tm.baseGoType(baseType)
 	}
-
-	// For nullable fields, use sql_types
 	return tm.nullableGoType(baseType)
 }
 
@@ -106,6 +120,9 @@ func (tm *TypeMapper) baseGoType(sqlType string) string {
 
 		// Other
 		"money": "float64",
+
+		// pgvector — always uses SqlVector even when NOT NULL
+		"vector": tm.sqlTypesAlias + ".SqlVector",
 	}
 
 	if goType, ok := typeMap[sqlType]; ok {
@@ -179,6 +196,9 @@ func (tm *TypeMapper) nullableGoType(sqlType string) string {
 
 		// Other
 		"money": tm.sqlTypesAlias + ".SqlFloat64",
+
+		// pgvector
+		"vector": tm.sqlTypesAlias + ".SqlVector",
 	}
 
 	if goType, ok := typeMap[sqlType]; ok {
@@ -189,6 +209,123 @@ func (tm *TypeMapper) nullableGoType(sqlType string) string {
 	return tm.sqlTypesAlias + ".SqlString"
 }
 
+// arrayGoType returns the Go type for a PostgreSQL array column.
+// The baseElemType is the canonical base type (e.g. "text", "integer").
+func (tm *TypeMapper) arrayGoType(baseElemType string) string {
+	if tm.typeStyle == writers.NullableTypeStdlib {
+		return tm.stdlibArrayGoType(baseElemType)
+	}
+	typeMap := map[string]string{
+		"text": tm.sqlTypesAlias + ".SqlStringArray", "varchar": tm.sqlTypesAlias + ".SqlStringArray",
+		"char": tm.sqlTypesAlias + ".SqlStringArray", "character": tm.sqlTypesAlias + ".SqlStringArray",
+		"citext": tm.sqlTypesAlias + ".SqlStringArray", "bpchar": tm.sqlTypesAlias + ".SqlStringArray",
+		"inet": tm.sqlTypesAlias + ".SqlStringArray", "cidr": tm.sqlTypesAlias + ".SqlStringArray",
+		"macaddr": tm.sqlTypesAlias + ".SqlStringArray",
+		"json":    tm.sqlTypesAlias + ".SqlStringArray", "jsonb": tm.sqlTypesAlias + ".SqlStringArray",
+		"integer": tm.sqlTypesAlias + ".SqlInt32Array", "int": tm.sqlTypesAlias + ".SqlInt32Array",
+		"int4": tm.sqlTypesAlias + ".SqlInt32Array", "serial": tm.sqlTypesAlias + ".SqlInt32Array",
+		"smallint": tm.sqlTypesAlias + ".SqlInt16Array", "int2": tm.sqlTypesAlias + ".SqlInt16Array",
+		"smallserial": tm.sqlTypesAlias + ".SqlInt16Array",
+		"bigint":      tm.sqlTypesAlias + ".SqlInt64Array", "int8": tm.sqlTypesAlias + ".SqlInt64Array",
+		"bigserial": tm.sqlTypesAlias + ".SqlInt64Array",
+		"real":      tm.sqlTypesAlias + ".SqlFloat32Array", "float4": tm.sqlTypesAlias + ".SqlFloat32Array",
+		"double precision": tm.sqlTypesAlias + ".SqlFloat64Array", "float8": tm.sqlTypesAlias + ".SqlFloat64Array",
+		"numeric": tm.sqlTypesAlias + ".SqlFloat64Array", "decimal": tm.sqlTypesAlias + ".SqlFloat64Array",
+		"money":   tm.sqlTypesAlias + ".SqlFloat64Array",
+		"boolean": tm.sqlTypesAlias + ".SqlBoolArray", "bool": tm.sqlTypesAlias + ".SqlBoolArray",
+		"uuid": tm.sqlTypesAlias + ".SqlUUIDArray",
+	}
+	if goType, ok := typeMap[baseElemType]; ok {
+		return goType
+	}
+	return tm.sqlTypesAlias + ".SqlStringArray"
+}
+
+// rawGoType returns the plain Go type for a NOT NULL column in stdlib mode.
+func (tm *TypeMapper) rawGoType(sqlType string) string {
+	typeMap := map[string]string{
+		"integer": "int32", "int": "int32", "int4": "int32", "serial": "int32",
+		"smallint": "int16", "int2": "int16", "smallserial": "int16",
+		"bigint": "int64", "int8": "int64", "bigserial": "int64",
+		"boolean": "bool", "bool": "bool",
+		"real": "float32", "float4": "float32",
+		"double precision": "float64", "float8": "float64",
+		"numeric": "float64", "decimal": "float64", "money": "float64",
+		"text": "string", "varchar": "string", "char": "string",
+		"character": "string", "citext": "string", "bpchar": "string",
+		"inet": "string", "cidr": "string", "macaddr": "string",
+		"uuid": "string", "json": "string", "jsonb": "string",
+		"timestamp":                   "time.Time",
+		"timestamp without time zone": "time.Time",
+		"timestamp with time zone":    "time.Time",
+		"timestamptz":                 "time.Time",
+		"date":                        "time.Time",
+		"time":                        "time.Time",
+		"time without time zone":      "time.Time",
+		"time with time zone":         "time.Time",
+		"timetz":                      "time.Time",
+		"bytea":                       "[]byte",
+		"vector":                      "[]float32",
+	}
+	if goType, ok := typeMap[sqlType]; ok {
+		return goType
+	}
+	return "string"
+}
+
+// stdlibNullableGoType returns the database/sql nullable type for a column.
+func (tm *TypeMapper) stdlibNullableGoType(sqlType string) string {
+	typeMap := map[string]string{
+		"integer": "sql.NullInt32", "int": "sql.NullInt32", "int4": "sql.NullInt32", "serial": "sql.NullInt32",
+		"smallint": "sql.NullInt16", "int2": "sql.NullInt16", "smallserial": "sql.NullInt16",
+		"bigint": "sql.NullInt64", "int8": "sql.NullInt64", "bigserial": "sql.NullInt64",
+		"boolean": "sql.NullBool", "bool": "sql.NullBool",
+		"real": "sql.NullFloat64", "float4": "sql.NullFloat64",
+		"double precision": "sql.NullFloat64", "float8": "sql.NullFloat64",
+		"numeric": "sql.NullFloat64", "decimal": "sql.NullFloat64", "money": "sql.NullFloat64",
+		"text": "sql.NullString", "varchar": "sql.NullString", "char": "sql.NullString",
+		"character": "sql.NullString", "citext": "sql.NullString", "bpchar": "sql.NullString",
+		"inet": "sql.NullString", "cidr": "sql.NullString", "macaddr": "sql.NullString",
+		"uuid": "sql.NullString", "json": "sql.NullString", "jsonb": "sql.NullString",
+		"timestamp":                   "sql.NullTime",
+		"timestamp without time zone": "sql.NullTime",
+		"timestamp with time zone":    "sql.NullTime",
+		"timestamptz":                 "sql.NullTime",
+		"date":                        "sql.NullTime",
+		"time":                        "sql.NullTime",
+		"time without time zone":      "sql.NullTime",
+		"time with time zone":         "sql.NullTime",
+		"timetz":                      "sql.NullTime",
+		"bytea":                       "[]byte",
+		"vector":                      "[]float32",
+	}
+	if goType, ok := typeMap[sqlType]; ok {
+		return goType
+	}
+	return "sql.NullString"
+}
+
+// stdlibArrayGoType returns a plain Go slice type for array columns in stdlib mode.
+func (tm *TypeMapper) stdlibArrayGoType(baseElemType string) string {
+	typeMap := map[string]string{
+		"text": "[]string", "varchar": "[]string", "char": "[]string",
+		"character": "[]string", "citext": "[]string", "bpchar": "[]string",
+		"inet": "[]string", "cidr": "[]string", "macaddr": "[]string",
+		"uuid": "[]string", "json": "[]string", "jsonb": "[]string",
+		"integer": "[]int32", "int": "[]int32", "int4": "[]int32", "serial": "[]int32",
+		"smallint": "[]int16", "int2": "[]int16", "smallserial": "[]int16",
+		"bigint": "[]int64", "int8": "[]int64", "bigserial": "[]int64",
+		"real": "[]float32", "float4": "[]float32",
+		"double precision": "[]float64", "float8": "[]float64",
+		"numeric": "[]float64", "decimal": "[]float64", "money": "[]float64",
+		"boolean": "[]bool", "bool": "[]bool",
+	}
+	if goType, ok := typeMap[baseElemType]; ok {
+		return goType
+	}
+	return "[]string"
+}
+
 // BuildGormTag generates a complete GORM tag string for a column
 func (tm *TypeMapper) BuildGormTag(column *models.Column, table *models.Table) string {
 	var parts []string
@@ -330,7 +467,16 @@ func (tm *TypeMapper) NeedsFmtImport(generateGetIDStr bool) bool {
 	return generateGetIDStr
 }
 
-// GetSQLTypesImport returns the import path for sql_types
+// GetSQLTypesImport returns the import path for the ResolveSpec spectypes package.
 func (tm *TypeMapper) GetSQLTypesImport() string {
 	return "github.com/bitechdev/ResolveSpec/pkg/spectypes"
 }
+
+// GetNullableTypeImportLine returns the full Go import line for the nullable type
+// package (ready to pass to AddImport). Returns empty string when no import is needed.
+func (tm *TypeMapper) GetNullableTypeImportLine() string {
+	if tm.typeStyle == writers.NullableTypeStdlib {
+		return "\"database/sql\""
+	}
+	return fmt.Sprintf("%s \"%s\"", tm.sqlTypesAlias, tm.GetSQLTypesImport())
+}

pkg/writers/gorm/writer.go

@@ -24,7 +24,7 @@ type Writer struct {
 func NewWriter(options *writers.WriterOptions) *Writer {
 	w := &Writer{
 		options:    options,
-		typeMapper: NewTypeMapper(),
+		typeMapper: NewTypeMapper(options.NullableTypes),
 		config:     LoadMethodConfigFromMetadata(options.Metadata),
 	}
 
@@ -77,8 +77,8 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 	packageName := w.getPackageName()
 	templateData := NewTemplateData(packageName, w.config)
 
-	// Add sql_types import (always needed for nullable types)
+	// Add nullable types import (resolvespec or stdlib depending on options)
-	templateData.AddImport(fmt.Sprintf("sql_types \"%s\"", w.typeMapper.GetSQLTypesImport()))
+	templateData.AddImport(w.typeMapper.GetNullableTypeImportLine())
 
 	// Collect all models
 	for _, schema := range db.Schemas {
@@ -99,8 +99,8 @@ func (w *Writer) writeSingleFile(db *models.Database) error {
 		}
 	}
 
-	// Add fmt import if GetIDStr is enabled
+	// Add fmt import when generated helper methods need string formatting.
-	if w.config.GenerateGetIDStr {
+	if w.needsFmtImport(templateData.Models) {
 		templateData.AddImport("\"fmt\"")
 	}
 
@@ -171,8 +171,8 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 			// Create template data for this single table
 			templateData := NewTemplateData(packageName, w.config)
 
-			// Add sql_types import
+			// Add nullable types import (resolvespec or stdlib depending on options)
-			templateData.AddImport(fmt.Sprintf("sql_types \"%s\"", w.typeMapper.GetSQLTypesImport()))
+			templateData.AddImport(w.typeMapper.GetNullableTypeImportLine())
 
 			// Create model data
 			modelData := NewModelData(table, schema.Name, w.typeMapper, w.options.FlattenSchema)
@@ -189,8 +189,8 @@ func (w *Writer) writeMultiFile(db *models.Database) error {
 				}
 			}
 
-			// Add fmt import if GetIDStr is enabled
+			// Add fmt import when generated helper methods need string formatting.
-			if w.config.GenerateGetIDStr {
+			if w.needsFmtImport(templateData.Models) {
 				templateData.AddImport("\"fmt\"")
 			}
 
@@ -295,6 +295,26 @@ func (w *Writer) addRelationshipFields(modelData *ModelData, table *models.Table
 	}
 }
 
+func (w *Writer) needsFmtImport(models []*ModelData) bool {
+	if w.config.GenerateGetIDStr {
+		for _, model := range models {
+			if model.PrimaryKeyField != "" && !model.PrimaryKeyIsSQL && !model.PrimaryKeyIsStr {
+				return true
+			}
+		}
+	}
+
+	if w.config.GenerateUpdateID {
+		for _, model := range models {
+			if model.PrimaryKeyField != "" && model.PrimaryKeyIsSQL && !model.PrimaryKeyIsStr {
+				return true
+			}
+		}
+	}
+
+	return false
+}
+
 // findTable finds a table by schema and name in the database
 func (w *Writer) findTable(schemaName, tableName string, db *models.Database) *models.Table {
 	for _, schema := range db.Schemas {

pkg/writers/gorm/writer_test.go

@@ -598,6 +598,55 @@ func TestWriter_UpdateIDTypeSafety(t *testing.T) {
 	}
 }
 
+func TestWriter_StringPrimaryKeyHelpers_Gorm(t *testing.T) {
+	table := models.InitTable("accounts", "public")
+	table.Columns["id"] = &models.Column{
+		Name:         "id",
+		Type:         "uuid",
+		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)
+
+	expectations := []string{
+		"ID string",
+		"func (m ModelPublicAccounts) GetID() string",
+		"return m.ID",
+		"func (m ModelPublicAccounts) GetIDStr() string",
+		"func (m ModelPublicAccounts) SetID(newid string)",
+		"func (m *ModelPublicAccounts) UpdateID(newid string)",
+		"m.ID = newid",
+	}
+
+	for _, expected := range expectations {
+		if !strings.Contains(generated, expected) {
+			t.Errorf("Generated code missing expected content: %q\nGenerated:\n%s", expected, generated)
+		}
+	}
+
+	if strings.Contains(generated, "GetID() int64") || strings.Contains(generated, "UpdateID(newid int64)") {
+		t.Errorf("String primary keys should not use int64 helper signatures\nGenerated:\n%s", generated)
+	}
+}
+
 func TestNameConverter_SnakeCaseToPascalCase(t *testing.T) {
 	tests := []struct {
 		input    string
@@ -643,7 +692,7 @@ func TestNameConverter_Pluralize(t *testing.T) {
 }
 
 func TestTypeMapper_SQLTypeToGoType(t *testing.T) {
-	mapper := NewTypeMapper()
+	mapper := NewTypeMapper("")
 
 	tests := []struct {
 		sqlType string
@@ -658,6 +707,10 @@ func TestTypeMapper_SQLTypeToGoType(t *testing.T) {
 		{"timestamp", false, "sql_types.SqlTimeStamp"},
 		{"boolean", true, "bool"},
 		{"boolean", false, "sql_types.SqlBool"},
+		{"text[]", true, "sql_types.SqlStringArray"},
+		{"text[]", false, "sql_types.SqlStringArray"},
+		{"integer[]", true, "sql_types.SqlInt32Array"},
+		{"bigint[]", false, "sql_types.SqlInt64Array"},
 	}
 
 	for _, tt := range tests {
@@ -670,8 +723,23 @@ func TestTypeMapper_SQLTypeToGoType(t *testing.T) {
 	}
 }
 
+func TestTypeMapper_BuildGormTag_ArrayType(t *testing.T) {
+	mapper := NewTypeMapper("")
+
+	col := &models.Column{
+		Name:    "tags",
+		Type:    "text[]",
+		NotNull: false,
+	}
+
+	tag := mapper.BuildGormTag(col, nil)
+	if !strings.Contains(tag, "type:text[]") {
+		t.Fatalf("expected array type to be preserved, got %q", tag)
+	}
+}
+
 func TestTypeMapper_BuildGormTag_PreservesExplicitTypeModifiers(t *testing.T) {
-	mapper := NewTypeMapper()
+	mapper := NewTypeMapper("")
 
 	col := &models.Column{
 		Name:      "embedding",

pkg/writers/pgsql/migration_writer.go

@@ -31,6 +31,10 @@ type MigrationWriter struct {
 
 // NewMigrationWriter creates a new templated migration writer
 func NewMigrationWriter(options *writers.WriterOptions) (*MigrationWriter, error) {
+	if options == nil {
+		options = &writers.WriterOptions{}
+	}
+
 	executor, err := NewTemplateExecutor(options.FlattenSchema)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create template executor: %w", err)
@@ -44,6 +48,16 @@ func NewMigrationWriter(options *writers.WriterOptions) (*MigrationWriter, error
 
 // WriteMigration generates migration scripts using templates
 func (w *MigrationWriter) WriteMigration(model *models.Database, current *models.Database) error {
+	if model == nil {
+		return fmt.Errorf("model database is required")
+	}
+	if w.options == nil {
+		w.options = &writers.WriterOptions{}
+	}
+	if current == nil {
+		current = models.InitDatabase(model.Name)
+	}
+
 	var writer io.Writer
 	var file *os.File
 	var err error
@@ -86,9 +100,16 @@ func (w *MigrationWriter) WriteMigration(model *models.Database, current *models
 
 	// Process each schema in the model
 	for _, modelSchema := range model.Schemas {
+		if modelSchema == nil {
+			continue
+		}
+
 		// Find corresponding schema in current database
 		var currentSchema *models.Schema
 		for _, cs := range current.Schemas {
+			if cs == nil {
+				continue
+			}
 			if strings.EqualFold(cs.Name, modelSchema.Name) {
 				currentSchema = cs
 				break
@@ -139,6 +160,17 @@ func (w *MigrationWriter) WriteMigration(model *models.Database, current *models
 func (w *MigrationWriter) generateSchemaScripts(model *models.Schema, current *models.Schema) ([]MigrationScript, error) {
 	scripts := make([]MigrationScript, 0)
 
+	if schemaRequiresPGTrgm(model) {
+		scripts = append(scripts, MigrationScript{
+			ObjectName: "extension.pg_trgm",
+			ObjectType: "create extension",
+			Schema:     model.Name,
+			Priority:   80,
+			Sequence:   len(scripts),
+			Body:       "CREATE EXTENSION IF NOT EXISTS pg_trgm;",
+		})
+	}
+
 	// Phase 1: Drop constraints and indexes that changed (Priority 11-50)
 	if current != nil {
 		dropScripts, err := w.generateDropScripts(model, current)
@@ -329,14 +361,18 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 			// Column doesn't exist, add it
 			defaultVal := ""
 			if modelCol.Default != nil {
+				if value, ok := modelCol.Default.(string); ok {
+					defaultVal = writers.QuoteDefaultValue(value, modelCol.Type)
+				} else {
 					defaultVal = fmt.Sprintf("%v", modelCol.Default)
 				}
+			}
 
 			sql, err := w.executor.ExecuteAddColumn(AddColumnData{
 				SchemaName: schema.Name,
 				TableName:  modelTable.Name,
 				ColumnName: modelCol.Name,
-				ColumnType: pgsql.ConvertSQLType(modelCol.Type),
+				ColumnType: effectiveColumnSQLType(modelCol),
 				Default:    defaultVal,
 				NotNull:    modelCol.NotNull,
 			})
@@ -355,12 +391,13 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 			scripts = append(scripts, script)
 		} else if !columnsEqual(modelCol, currentCol) {
 			// Column exists but properties changed
-			if modelCol.Type != currentCol.Type {
+			if !columnTypesEqual(modelCol, currentCol) {
 				sql, err := w.executor.ExecuteAlterColumnType(AlterColumnTypeData{
 					SchemaName: schema.Name,
 					TableName:  modelTable.Name,
 					ColumnName: modelCol.Name,
-					NewType:    pgsql.ConvertSQLType(modelCol.Type),
+					NewType:    effectiveAlterColumnSQLType(modelCol),
+					UsingExpr:  buildAlterColumnUsingExpression(modelCol.Name, effectiveAlterColumnSQLType(modelCol)),
 				})
 				if err != nil {
 					return nil, err
@@ -382,8 +419,12 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 				setDefault := modelCol.Default != nil
 				defaultVal := ""
 				if setDefault {
+					if value, ok := modelCol.Default.(string); ok {
+						defaultVal = writers.QuoteDefaultValue(value, modelCol.Type)
+					} else {
 						defaultVal = fmt.Sprintf("%v", modelCol.Default)
 					}
+				}
 
 				sql, err := w.executor.ExecuteAlterColumnDefault(AlterColumnDefaultData{
 					SchemaName:   schema.Name,
@@ -537,12 +578,17 @@ func (w *MigrationWriter) generateIndexScripts(model *models.Schema, current *mo
 					indexType = modelIndex.Type
 				}
 
+				columnExprs := buildIndexColumnExpressions(modelTable, modelIndex, indexType)
+				if len(columnExprs) == 0 {
+					continue
+				}
+
 				sql, err := w.executor.ExecuteCreateIndex(CreateIndexData{
 					SchemaName: model.Name,
 					TableName:  modelTable.Name,
 					IndexName:  indexName,
 					IndexType:  indexType,
-					Columns:    strings.Join(modelIndex.Columns, ", "),
+					Columns:    strings.Join(columnExprs, ", "),
 					Unique:     modelIndex.Unique,
 				})
 				if err != nil {
@@ -565,6 +611,26 @@ func (w *MigrationWriter) generateIndexScripts(model *models.Schema, current *mo
 	return scripts, nil
 }
 
+func buildIndexColumnExpressions(table *models.Table, index *models.Index, indexType string) []string {
+	columnExprs := make([]string, 0, len(index.Columns))
+	for _, colName := range index.Columns {
+		colExpr := colName
+		if table != nil {
+			if col, ok := resolveIndexColumn(table, colName); ok && col != nil {
+				colExpr = col.SQLName()
+				if strings.EqualFold(indexType, "gin") {
+					opClass := ginOperatorClassForColumn(col, index.Comment)
+					if opClass != "" {
+						colExpr = fmt.Sprintf("%s %s", col.SQLName(), opClass)
+					}
+				}
+			}
+		}
+		columnExprs = append(columnExprs, colExpr)
+	}
+	return columnExprs
+}
+
 // generateForeignKeyScripts generates ADD CONSTRAINT FOREIGN KEY scripts using templates
 func (w *MigrationWriter) generateForeignKeyScripts(model *models.Schema, current *models.Schema) ([]MigrationScript, error) {
 	scripts := make([]MigrationScript, 0)
@@ -820,11 +886,21 @@ func columnsEqual(col1, col2 *models.Column) bool {
 	if col1 == nil || col2 == nil {
 		return false
 	}
-	return strings.EqualFold(col1.Type, col2.Type) &&
+	return columnTypesEqual(col1, col2) &&
 		col1.NotNull == col2.NotNull &&
 		fmt.Sprintf("%v", col1.Default) == fmt.Sprintf("%v", col2.Default)
 }
 
+func columnTypesEqual(col1, col2 *models.Column) bool {
+	if col1 == nil || col2 == nil {
+		return false
+	}
+	return strings.EqualFold(
+		pgsql.NormalizeEquivalentSQLType(effectiveColumnSQLType(col1)),
+		pgsql.NormalizeEquivalentSQLType(effectiveColumnSQLType(col2)),
+	)
+}
+
 // constraintsEqual checks if two constraints are equal
 func constraintsEqual(c1, c2 *models.Constraint) bool {
 	if c1 == nil || c2 == nil {

pkg/writers/pgsql/migration_writer_test.go

@@ -57,6 +57,410 @@ func TestWriteMigration_NewTable(t *testing.T) {
 	}
 }
 
+func TestWriteMigration_ArrayDefault(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("plans", "public")
+
+	tagsCol := models.InitColumn("tags", "plans", "public")
+	tagsCol.Type = "text[]"
+	tagsCol.NotNull = true
+	tagsCol.Default = "''{}''"
+	table.Columns["tags"] = tagsCol
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	err = writer.WriteMigration(model, current)
+	if err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "tags text[] DEFAULT '{}' NOT NULL") {
+		t.Fatalf("expected normalized array default in migration, got:\n%s", output)
+	}
+	if strings.Contains(output, "'''{}'''") {
+		t.Fatalf("migration still contains triple-quoted array default:\n%s", output)
+	}
+}
+
+func TestWriteMigration_AltersColumnTypeWhenActualTypeDiffers(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	currentTable := models.InitTable("learnings", "public")
+	currentDetails := models.InitColumn("details", "learnings", "public")
+	currentDetails.Type = "jsonb"
+	currentTable.Columns["details"] = currentDetails
+	currentSchema.Tables = append(currentSchema.Tables, currentTable)
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+	modelTable := models.InitTable("learnings", "public")
+	modelDetails := models.InitColumn("details", "learnings", "public")
+	modelDetails.Type = "text"
+	modelTable.Columns["details"] = modelDetails
+	modelSchema.Tables = append(modelSchema.Tables, modelTable)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "ALTER TABLE public.learnings") || !strings.Contains(output, "ALTER COLUMN details TYPE text") {
+		t.Fatalf("expected migration to alter mismatched column type, got:\n%s", output)
+	}
+	if !strings.Contains(output, `ALTER COLUMN details TYPE text USING details::text;`) {
+		t.Fatalf("expected migration type alter to include USING cast, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_UsesStorageTypeForSerialAlterStatements(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	currentTable := models.InitTable("learnings", "public")
+	currentID := models.InitColumn("id", "learnings", "public")
+	currentID.Type = "uuid"
+	currentTable.Columns["id"] = currentID
+	currentSchema.Tables = append(currentSchema.Tables, currentTable)
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+	modelTable := models.InitTable("learnings", "public")
+	modelID := models.InitColumn("id", "learnings", "public")
+	modelID.Type = "bigserial"
+	modelTable.Columns["id"] = modelID
+	modelSchema.Tables = append(modelSchema.Tables, modelTable)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "ALTER COLUMN id TYPE bigint") {
+		t.Fatalf("expected serial alter to use bigint storage type, got:\n%s", output)
+	}
+	if strings.Contains(output, "ALTER COLUMN id TYPE bigserial;") {
+		t.Fatalf("did not expect invalid bigserial alter statement, got:\n%s", output)
+	}
+	if !strings.Contains(output, `ALTER COLUMN id TYPE bigint USING id::bigint;`) {
+		t.Fatalf("expected serial alter to include USING cast, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_ArrayAlterIncludesUsingCast(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	currentTable := models.InitTable("learnings", "public")
+	currentTags := models.InitColumn("tags", "learnings", "public")
+	currentTags.Type = "text"
+	currentTable.Columns["tags"] = currentTags
+	currentSchema.Tables = append(currentSchema.Tables, currentTable)
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+	modelTable := models.InitTable("learnings", "public")
+	modelTags := models.InitColumn("tags", "learnings", "public")
+	modelTags.Type = "text[]"
+	modelTable.Columns["tags"] = modelTags
+	modelSchema.Tables = append(modelSchema.Tables, modelTable)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, `ALTER COLUMN tags TYPE text[] USING tags::text[];`) {
+		t.Fatalf("expected array alter to include USING cast, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_DoesNotAlterEquivalentNormalizedColumnType(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	currentTable := models.InitTable("users", "public")
+	currentEmail := models.InitColumn("email", "users", "public")
+	currentEmail.Type = "character varying"
+	currentEmail.Length = 255
+	currentTable.Columns["email"] = currentEmail
+	currentSchema.Tables = append(currentSchema.Tables, currentTable)
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+	modelTable := models.InitTable("users", "public")
+	modelEmail := models.InitColumn("email", "users", "public")
+	modelEmail.Type = "varchar(255)"
+	modelTable.Columns["email"] = modelEmail
+	modelSchema.Tables = append(modelSchema.Tables, modelTable)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if strings.Contains(output, "ALTER COLUMN email TYPE") {
+		t.Fatalf("did not expect alter type for equivalent normalized types, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_GinIndexOnTextUsesTrigramOperatorClass(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("articles", "public")
+	titleCol := models.InitColumn("title", "articles", "public")
+	titleCol.Type = "text"
+	table.Columns["title"] = titleCol
+
+	index := &models.Index{
+		Name:    "idx_articles_title_gin",
+		Type:    "gin",
+		Columns: []string{"title"},
+	}
+	table.Indexes[index.Name] = index
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "CREATE EXTENSION IF NOT EXISTS pg_trgm;") {
+		t.Fatalf("expected trigram extension for text GIN migration index, got:\n%s", output)
+	}
+	if !strings.Contains(output, "USING gin (title gin_trgm_ops)") {
+		t.Fatalf("expected GIN text index to include gin_trgm_ops, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_GinIndexOnQuotedTextColumnUsesTrigramOperatorClass(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("agent_personas", "public")
+	nameCol := models.InitColumn("name", "agent_personas", "public")
+	nameCol.Type = "text"
+	table.Columns["name"] = nameCol
+
+	index := &models.Index{
+		Name:    "idx_agent_personas_name_gin",
+		Type:    "gin",
+		Columns: []string{`"name"`},
+	}
+	table.Indexes[index.Name] = index
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "USING gin (name gin_trgm_ops)") {
+		t.Fatalf("expected quoted text column GIN index to include gin_trgm_ops, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_GinIndexOnTextArrayDoesNotUseTrigramOperatorClass(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("plans", "public")
+	tagsCol := models.InitColumn("tags", "plans", "public")
+	tagsCol.Type = "text[]"
+	table.Columns["tags"] = tagsCol
+
+	index := &models.Index{
+		Name:    "idx_plans_tags",
+		Type:    "gin",
+		Columns: []string{"tags"},
+	}
+	table.Indexes[index.Name] = index
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "USING gin (tags array_ops)") {
+		t.Fatalf("expected GIN array index with array_ops, got:\n%s", output)
+	}
+	if strings.Contains(output, "gin_trgm_ops") {
+		t.Fatalf("did not expect gin_trgm_ops for text[] migration index, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_GinIndexOnJSONBUsesJSONBOperatorClass(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("learnings", "public")
+	detailsCol := models.InitColumn("details", "learnings", "public")
+	detailsCol.Type = "jsonb"
+	table.Columns["details"] = detailsCol
+
+	index := &models.Index{
+		Name:    "idx_learnings_details",
+		Type:    "gin",
+		Columns: []string{"details"},
+	}
+	table.Indexes[index.Name] = index
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "USING gin (details jsonb_ops)") {
+		t.Fatalf("expected GIN jsonb index to include jsonb_ops, got:\n%s", output)
+	}
+	if strings.Contains(output, "gin_trgm_ops") {
+		t.Fatalf("did not expect gin_trgm_ops for jsonb migration index, got:\n%s", output)
+	}
+}
+
+func TestWriteMigration_GinIndexOnJSONBIgnoresIncompatibleTrigramOperatorClass(t *testing.T) {
+	current := models.InitDatabase("testdb")
+	currentSchema := models.InitSchema("public")
+	current.Schemas = append(current.Schemas, currentSchema)
+
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("learnings", "public")
+	detailsCol := models.InitColumn("details", "learnings", "public")
+	detailsCol.Type = "jsonb"
+	table.Columns["details"] = detailsCol
+
+	index := &models.Index{
+		Name:    "idx_learnings_details",
+		Type:    "gin",
+		Columns: []string{"details"},
+		Comment: "gin_trgm_ops",
+	}
+	table.Indexes[index.Name] = index
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(&writers.WriterOptions{})
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, current); err != nil {
+		t.Fatalf("WriteMigration failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "USING gin (details jsonb_ops)") {
+		t.Fatalf("expected incompatible trigram hint on jsonb to fall back to jsonb_ops, got:\n%s", output)
+	}
+}
+
 func TestWriteMigration_WithAudit(t *testing.T) {
 	// Current database (empty)
 	current := models.InitDatabase("testdb")
@@ -282,3 +686,46 @@ func TestWriteMigration_NumericConstraintNames(t *testing.T) {
 		t.Error("Migration missing FOREIGN KEY")
 	}
 }
+
+func TestNewMigrationWriter_NilOptions(t *testing.T) {
+	writer, err := NewMigrationWriter(nil)
+	if err != nil {
+		t.Fatalf("NewMigrationWriter(nil) returned error: %v", err)
+	}
+	if writer == nil {
+		t.Fatal("expected writer instance")
+	}
+	if writer.options == nil {
+		t.Fatal("expected default writer options to be initialized")
+	}
+}
+
+func TestWriteMigration_NilCurrentTreatsDatabaseAsEmpty(t *testing.T) {
+	model := models.InitDatabase("testdb")
+	modelSchema := models.InitSchema("public")
+
+	table := models.InitTable("users", "public")
+	idCol := models.InitColumn("id", "users", "public")
+	idCol.Type = "integer"
+	idCol.NotNull = true
+	table.Columns["id"] = idCol
+
+	modelSchema.Tables = append(modelSchema.Tables, table)
+	model.Schemas = append(model.Schemas, modelSchema)
+
+	var buf bytes.Buffer
+	writer, err := NewMigrationWriter(nil)
+	if err != nil {
+		t.Fatalf("Failed to create writer: %v", err)
+	}
+	writer.writer = &buf
+
+	if err := writer.WriteMigration(model, nil); err != nil {
+		t.Fatalf("WriteMigration with nil current failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "CREATE TABLE") {
+		t.Fatalf("expected CREATE TABLE in migration output, got:\n%s", output)
+	}
+}

pkg/writers/pgsql/templates.go

@@ -8,6 +8,7 @@ import (
 	"text/template"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
 )
 
 //go:embed templates/*.tmpl
@@ -94,6 +95,16 @@ type AlterColumnTypeData struct {
 	TableName  string
 	ColumnName string
 	NewType    string
+	UsingExpr  string
+}
+
+type AlterColumnTypeWithCheckData struct {
+	SchemaName      string
+	TableName       string
+	ColumnName      string
+	NewType         string
+	EquivalentTypes string
+	UsingExpr       string
 }
 
 // AlterColumnDefaultData contains data for alter column default template
@@ -266,6 +277,7 @@ type CreatePrimaryKeyWithAutoGenCheckData struct {
 	ConstraintName string
 	AutoGenNames   string // Comma-separated list of names like "'name1', 'name2'"
 	Columns        string
+	ColumnNames    string // Comma-separated list of quoted column names like "'id', 'tenant_id'"
 }
 
 // Execute methods for each template
@@ -300,6 +312,15 @@ func (te *TemplateExecutor) ExecuteAlterColumnType(data AlterColumnTypeData) (st
 	return buf.String(), nil
 }
 
+func (te *TemplateExecutor) ExecuteAlterColumnTypeWithCheck(data AlterColumnTypeWithCheckData) (string, error) {
+	var buf bytes.Buffer
+	err := te.templates.ExecuteTemplate(&buf, "alter_column_type_with_check.tmpl", data)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute alter_column_type_with_check template: %w", err)
+	}
+	return buf.String(), nil
+}
+
 // ExecuteAlterColumnDefault executes the alter column default template
 func (te *TemplateExecutor) ExecuteAlterColumnDefault(data AlterColumnDefaultData) (string, error) {
 	var buf bytes.Buffer
@@ -495,8 +516,12 @@ func BuildCreateTableData(schemaName string, table *models.Table) CreateTableDat
 			NotNull: col.NotNull,
 		}
 		if col.Default != nil {
+			if value, ok := col.Default.(string); ok {
+				colData.Default = writers.QuoteDefaultValue(value, col.Type)
+			} else {
 				colData.Default = fmt.Sprintf("%v", col.Default)
 			}
+		}
 		columns = append(columns, colData)
 	}
 

pkg/writers/pgsql/templates/alter_column_type.tmpl

@@ -1,2 +1,2 @@
 ALTER TABLE {{qual_table .SchemaName .TableName}}
-  ALTER COLUMN {{quote_ident .ColumnName}} TYPE {{.NewType}};
+  ALTER COLUMN {{quote_ident .ColumnName}} TYPE {{.NewType}}{{if .UsingExpr}} USING {{.UsingExpr}}{{end}};

pkg/writers/pgsql/templates/alter_column_type_with_check.tmpl

@@ -0,0 +1,22 @@
+DO $$
+DECLARE
+  current_type text;
+BEGIN
+  SELECT pg_catalog.format_type(a.atttypid, a.atttypmod)
+    INTO current_type
+  FROM pg_attribute a
+  JOIN pg_class t ON t.oid = a.attrelid
+  JOIN pg_namespace n ON n.oid = t.relnamespace
+  WHERE n.nspname = '{{.SchemaName}}'
+    AND t.relname = '{{.TableName}}'
+    AND a.attname = '{{.ColumnName}}'
+    AND a.attnum > 0
+    AND NOT a.attisdropped;
+
+  IF current_type IS NOT NULL
+     AND current_type <> ALL(ARRAY[{{.EquivalentTypes}}]) THEN
+    ALTER TABLE {{qual_table .SchemaName .TableName}}
+      ALTER COLUMN {{quote_ident .ColumnName}} TYPE {{.NewType}}{{if .UsingExpr}} USING {{.UsingExpr}}{{end}};
+  END IF;
+END;
+$$;

pkg/writers/pgsql/templates/create_primary_key_with_autogen_check.tmpl

@@ -1,26 +1,42 @@
 DO $$
 DECLARE
-  auto_pk_name text;
+  current_pk_name text;
+  current_pk_matches boolean := false;
 BEGIN
-  -- Drop auto-generated primary key if it exists
+  SELECT tc.constraint_name,
-  SELECT constraint_name INTO auto_pk_name
+         COALESCE(
-  FROM information_schema.table_constraints
+           ARRAY(
-  WHERE table_schema = '{{.SchemaName}}'
+             SELECT a.attname::text
-    AND table_name = '{{.TableName}}'
+             FROM pg_constraint c
-    AND constraint_type = 'PRIMARY KEY'
+             JOIN pg_class t ON t.oid = c.conrelid
-    AND constraint_name IN ({{.AutoGenNames}});
+             JOIN pg_namespace n ON n.oid = t.relnamespace
+             JOIN unnest(c.conkey) WITH ORDINALITY AS cols(attnum, ord)
+               ON TRUE
+             JOIN pg_attribute a
+               ON a.attrelid = t.oid
+              AND a.attnum = cols.attnum
+             WHERE c.contype = 'p'
+               AND n.nspname = '{{.SchemaName}}'
+               AND t.relname = '{{.TableName}}'
+             ORDER BY cols.ord
+           ),
+           ARRAY[]::text[]
+         ) = ARRAY[{{.ColumnNames}}]
+    INTO current_pk_name, current_pk_matches
+  FROM information_schema.table_constraints tc
+  WHERE tc.table_schema = '{{.SchemaName}}'
+    AND tc.table_name = '{{.TableName}}'
+    AND tc.constraint_type = 'PRIMARY KEY';
 
-  IF auto_pk_name IS NOT NULL THEN
+  IF current_pk_name IS NOT NULL
-    EXECUTE 'ALTER TABLE {{qual_table .SchemaName .TableName}} DROP CONSTRAINT ' || quote_ident(auto_pk_name);
+     AND NOT current_pk_matches
+     AND current_pk_name IN ({{.AutoGenNames}}) THEN
+    EXECUTE 'ALTER TABLE {{qual_table .SchemaName .TableName}} DROP CONSTRAINT ' || quote_ident(current_pk_name);
   END IF;
 
-  -- Add named primary key if it doesn't exist
+  -- Add the desired primary key only when no matching primary key already exists.
-  IF NOT EXISTS (
+  IF current_pk_name IS NULL
-    SELECT 1 FROM information_schema.table_constraints
+     OR (NOT current_pk_matches AND current_pk_name IN ({{.AutoGenNames}})) THEN
-    WHERE table_schema = '{{.SchemaName}}'
-      AND table_name = '{{.TableName}}'
-      AND constraint_name = '{{.ConstraintName}}'
-  ) THEN
     ALTER TABLE {{qual_table .SchemaName .TableName}} ADD CONSTRAINT {{quote_ident .ConstraintName}} PRIMARY KEY ({{.Columns}});
   END IF;
 END;

pkg/writers/pgsql/writer.go

@@ -143,6 +143,10 @@ func (w *Writer) GenerateSchemaStatements(schema *models.Schema) ([]string, erro
 		statements = append(statements, fmt.Sprintf("CREATE SCHEMA IF NOT EXISTS %s", schema.SQLName()))
 	}
 
+	if schemaRequiresPGTrgm(schema) {
+		statements = append(statements, `CREATE EXTENSION IF NOT EXISTS pg_trgm`)
+	}
+
 	// Phase 2: Create sequences
 	for _, table := range schema.Tables {
 		pk := table.GetPrimaryKey()
@@ -181,6 +185,12 @@ func (w *Writer) GenerateSchemaStatements(schema *models.Schema) ([]string, erro
 	}
 	statements = append(statements, addColStmts...)
 
+	alterTypeStmts, err := w.GenerateAlterColumnTypeStatements(schema)
+	if err != nil {
+		return nil, fmt.Errorf("failed to generate alter column type statements: %w", err)
+	}
+	statements = append(statements, alterTypeStmts...)
+
 	// Phase 4: Primary keys
 	for _, table := range schema.Tables {
 		// First check for explicit PrimaryKeyConstraint
@@ -228,6 +238,7 @@ func (w *Writer) GenerateSchemaStatements(schema *models.Schema) ([]string, erro
 				ConstraintName: pkName,
 				AutoGenNames:   formatStringList(autoGenPKNames),
 				Columns:        strings.Join(pkColumns, ", "),
+				ColumnNames:    formatStringList(pkColumns),
 			}
 
 			stmt, err := w.executor.ExecuteCreatePrimaryKeyWithAutoGenCheck(data)
@@ -260,16 +271,13 @@ func (w *Writer) GenerateSchemaStatements(schema *models.Schema) ([]string, erro
 			columnExprs := make([]string, 0, len(index.Columns))
 			for _, colName := range index.Columns {
 				colExpr := colName
-				if col, ok := table.Columns[colName]; ok {
+				if col, ok := resolveIndexColumn(table, colName); ok {
-					// For GIN indexes on text columns, add operator class
+					if strings.EqualFold(indexType, "gin") {
-					if strings.EqualFold(indexType, "gin") && isTextType(col.Type) {
+						if opClass := ginOperatorClassForColumn(col, index.Comment); opClass != "" {
-						opClass := extractOperatorClass(index.Comment)
-						if opClass == "" {
-							opClass = "gin_trgm_ops"
-						}
 							colExpr = fmt.Sprintf("%s %s", colName, opClass)
 						}
 					}
+				}
 				columnExprs = append(columnExprs, colExpr)
 			}
 
@@ -436,6 +444,33 @@ func (w *Writer) GenerateAddColumnStatements(schema *models.Schema) ([]string, e
 	return statements, nil
 }
 
+func (w *Writer) GenerateAlterColumnTypeStatements(schema *models.Schema) ([]string, error) {
+	statements := []string{}
+
+	statements = append(statements, fmt.Sprintf("-- Alter column types for schema: %s", schema.Name))
+
+	for _, table := range schema.Tables {
+		columns := getSortedColumns(table.Columns)
+		for _, col := range columns {
+			targetType := effectiveAlterColumnSQLType(col)
+			stmt, err := w.executor.ExecuteAlterColumnTypeWithCheck(AlterColumnTypeWithCheckData{
+				SchemaName:      schema.Name,
+				TableName:       table.Name,
+				ColumnName:      col.Name,
+				NewType:         targetType,
+				EquivalentTypes: equivalentTypeListSQL(targetType),
+				UsingExpr:       buildAlterColumnUsingExpression(col.Name, targetType),
+			})
+			if err != nil {
+				return nil, fmt.Errorf("failed to generate alter column type for %s.%s.%s: %w", schema.Name, table.Name, col.Name, err)
+			}
+			statements = append(statements, stmt)
+		}
+	}
+
+	return statements, nil
+}
+
 // GenerateAddColumnsForDatabase generates ALTER TABLE ADD COLUMN statements for the entire database
 func (w *Writer) GenerateAddColumnsForDatabase(db *models.Database) ([]string, error) {
 	statements := []string{}
@@ -488,31 +523,7 @@ 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 - convert to valid PostgreSQL type
+	parts = append(parts, effectiveColumnSQLType(col))
-	baseType := pgsql.ConvertSQLType(col.Type)
-	typeStr := baseType
-	hasExplicitTypeModifier := pgsql.HasExplicitTypeModifier(baseType)
-
-	// Only add size specifiers for types that support them
-	if !hasExplicitTypeModifier && col.Length > 0 && col.Precision == 0 {
-		if pgsql.SupportsLength(baseType) {
-			typeStr = fmt.Sprintf("%s(%d)", baseType, col.Length)
-		} else if isTextTypeWithoutLength(baseType) {
-			// Convert text with length to varchar
-			typeStr = fmt.Sprintf("varchar(%d)", col.Length)
-		}
-		// For types that don't support length (integer, bigint, etc.), ignore the length
-	} else if !hasExplicitTypeModifier && col.Precision > 0 {
-		if pgsql.SupportsPrecision(baseType) {
-			if col.Scale > 0 {
-				typeStr = fmt.Sprintf("%s(%d,%d)", baseType, col.Precision, col.Scale)
-			} else {
-				typeStr = fmt.Sprintf("%s(%d)", baseType, col.Precision)
-			}
-		}
-		// For types that don't support precision, ignore it
-	}
-	parts = append(parts, typeStr)
 
 	// NOT NULL
 	if col.NotNull {
@@ -523,15 +534,7 @@ func (w *Writer) generateColumnDefinition(col *models.Column) string {
 	if col.Default != nil {
 		switch v := col.Default.(type) {
 		case string:
-			// Strip backticks - DBML uses them for SQL expressions but PostgreSQL doesn't
+			parts = append(parts, fmt.Sprintf("DEFAULT %s", writers.QuoteDefaultValue(stripBackticks(v), col.Type)))
-			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(cleanDefault)))
-			}
 		case bool:
 			parts = append(parts, fmt.Sprintf("DEFAULT %v", v))
 		default:
@@ -542,6 +545,64 @@ func (w *Writer) generateColumnDefinition(col *models.Column) string {
 	return strings.Join(parts, " ")
 }
 
+func effectiveColumnSQLType(col *models.Column) string {
+	if col == nil {
+		return ""
+	}
+
+	baseType := pgsql.ConvertSQLType(col.Type)
+	typeStr := baseType
+	hasExplicitTypeModifier := pgsql.HasExplicitTypeModifier(baseType)
+
+	if !hasExplicitTypeModifier && col.Length > 0 && col.Precision == 0 {
+		if pgsql.SupportsLength(baseType) {
+			typeStr = fmt.Sprintf("%s(%d)", baseType, col.Length)
+		} else if isTextTypeWithoutLength(baseType) {
+			typeStr = fmt.Sprintf("varchar(%d)", col.Length)
+		}
+	} else if !hasExplicitTypeModifier && col.Precision > 0 {
+		if pgsql.SupportsPrecision(baseType) {
+			if col.Scale > 0 {
+				typeStr = fmt.Sprintf("%s(%d,%d)", baseType, col.Precision, col.Scale)
+			} else {
+				typeStr = fmt.Sprintf("%s(%d)", baseType, col.Precision)
+			}
+		}
+	}
+
+	return typeStr
+}
+
+func effectiveAlterColumnSQLType(col *models.Column) string {
+	typeStr := effectiveColumnSQLType(col)
+	switch strings.ToLower(strings.TrimSpace(typeStr)) {
+	case "smallserial":
+		return "smallint"
+	case "serial":
+		return "integer"
+	case "bigserial":
+		return "bigint"
+	default:
+		return typeStr
+	}
+}
+
+func buildAlterColumnUsingExpression(columnName, targetType string) string {
+	if strings.TrimSpace(columnName) == "" || strings.TrimSpace(targetType) == "" {
+		return ""
+	}
+	return fmt.Sprintf("%s::%s", quoteIdent(columnName), targetType)
+}
+
+func equivalentTypeListSQL(sqlType string) string {
+	variants := pgsql.EquivalentSQLTypeVariants(sqlType)
+	quoted := make([]string, 0, len(variants))
+	for _, variant := range variants {
+		quoted = append(quoted, fmt.Sprintf("'%s'", escapeQuote(variant)))
+	}
+	return strings.Join(quoted, ", ")
+}
+
 // WriteSchema writes a single schema and all its tables
 func (w *Writer) WriteSchema(schema *models.Schema) error {
 	if w.writer == nil {
@@ -553,6 +614,10 @@ func (w *Writer) WriteSchema(schema *models.Schema) error {
 		return err
 	}
 
+	if err := w.writeRequiredExtensions(schema); err != nil {
+		return err
+	}
+
 	// Phase 2: Create sequences (priority 80)
 	if err := w.writeSequences(schema); err != nil {
 		return err
@@ -568,6 +633,10 @@ func (w *Writer) WriteSchema(schema *models.Schema) error {
 		return err
 	}
 
+	if err := w.writeAlterColumnTypes(schema); err != nil {
+		return err
+	}
+
 	// Phase 4: Create primary keys (priority 160)
 	if err := w.writePrimaryKeys(schema); err != nil {
 		return err
@@ -668,6 +737,16 @@ func (w *Writer) writeCreateSchema(schema *models.Schema) error {
 	return nil
 }
 
+func (w *Writer) writeRequiredExtensions(schema *models.Schema) error {
+	if !schemaRequiresPGTrgm(schema) {
+		return nil
+	}
+
+	fmt.Fprintln(w.writer, "CREATE EXTENSION IF NOT EXISTS pg_trgm;")
+	fmt.Fprintln(w.writer)
+	return nil
+}
+
 // writeSequences generates CREATE SEQUENCE statements for identity columns
 func (w *Writer) writeSequences(schema *models.Schema) error {
 	fmt.Fprintf(w.writer, "-- Sequences for schema: %s\n", schema.Name)
@@ -761,6 +840,21 @@ func (w *Writer) writeAddColumns(schema *models.Schema) error {
 	return nil
 }
 
+func (w *Writer) writeAlterColumnTypes(schema *models.Schema) error {
+	fmt.Fprintf(w.writer, "-- Alter column types for schema: %s\n", schema.Name)
+
+	statements, err := w.GenerateAlterColumnTypeStatements(schema)
+	if err != nil {
+		return err
+	}
+	for _, stmt := range statements[1:] {
+		fmt.Fprint(w.writer, stmt)
+		fmt.Fprint(w.writer, "\n")
+	}
+
+	return nil
+}
+
 // writePrimaryKeys generates ALTER TABLE statements for primary keys
 func (w *Writer) writePrimaryKeys(schema *models.Schema) error {
 	fmt.Fprintf(w.writer, "-- Primary keys for schema: %s\n", schema.Name)
@@ -814,6 +908,7 @@ func (w *Writer) writePrimaryKeys(schema *models.Schema) error {
 			ConstraintName: pkName,
 			AutoGenNames:   formatStringList(autoGenPKNames),
 			Columns:        strings.Join(columnNames, ", "),
+			ColumnNames:    formatStringList(columnNames),
 		}
 
 		sql, err := w.executor.ExecuteCreatePrimaryKeyWithAutoGenCheck(data)
@@ -861,16 +956,14 @@ func (w *Writer) writeIndexes(schema *models.Schema) error {
 			// 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 {
+				if col, ok := resolveIndexColumn(table, colName); ok {
 					colExpr := col.SQLName()
-					// For GIN indexes on text columns, add operator class
+					if strings.EqualFold(index.Type, "gin") {
-					if strings.EqualFold(index.Type, "gin") && isTextType(col.Type) {
+						opClass := ginOperatorClassForColumn(col, index.Comment)
-						opClass := extractOperatorClass(index.Comment)
+						if opClass != "" {
-						if opClass == "" {
-							opClass = "gin_trgm_ops"
-						}
 							colExpr = fmt.Sprintf("%s %s", col.SQLName(), opClass)
 						}
+					}
 					columnExprs = append(columnExprs, colExpr)
 				}
 			}
@@ -1256,20 +1349,126 @@ func isIntegerType(colType string) bool {
 }
 
 // isTextType checks if a column type is a text type (for GIN index operator class)
-func isTextType(colType string) bool {
+// func isTextType(colType string) bool {
-	textTypes := []string{"text", "varchar", "character varying", "char", "character", "string"}
+// 	textTypes := []string{"text", "varchar", "character varying", "char", "character", "string"}
-	lowerType := strings.ToLower(colType)
+// 	lowerType := strings.ToLower(colType)
-	for _, t := range textTypes {
+// 	if strings.HasSuffix(lowerType, "[]") {
-		if strings.HasPrefix(lowerType, t) {
+// 		return false
+// 	}
+// 	for _, t := range textTypes {
+// 		if strings.HasPrefix(lowerType, t) {
+// 			return true
+// 		}
+// 	}
+// 	return false
+// }
+
+// isTextTypeWithoutLength checks if type is text (which should convert to varchar when length is specified)
+func isTextTypeWithoutLength(colType string) bool {
+	return strings.EqualFold(colType, "text")
+}
+
+func ginOperatorClassForColumn(col *models.Column, comment string) string {
+	if col == nil {
+		return ""
+	}
+
+	sqlType := effectiveColumnSQLType(col)
+	baseType := pgsql.CanonicalizeBaseType(pgsql.ExtractBaseTypeLower(sqlType))
+	isArray := pgsql.IsArrayType(sqlType)
+	requested := extractOperatorClass(comment)
+
+	if requested != "" && ginOperatorClassCompatible(baseType, isArray, requested) {
+		return requested
+	}
+
+	if isArray {
+		return "array_ops"
+	}
+
+	switch {
+	case isTextGinBaseType(baseType):
+		return "gin_trgm_ops"
+	case baseType == "jsonb":
+		return "jsonb_ops"
+	default:
+		return requested
+	}
+}
+
+func ginOperatorClassCompatible(baseType string, isArray bool, opClass string) bool {
+	switch opClass {
+	case "gin_trgm_ops", "gin_bigm_ops":
+		return !isArray && isTextGinBaseType(baseType)
+	case "jsonb_ops", "jsonb_path_ops":
+		return !isArray && baseType == "jsonb"
+	case "array_ops":
+		return isArray
+	default:
 		return true
 	}
+}
+
+func isTextGinBaseType(baseType string) bool {
+	switch baseType {
+	case "text", "varchar", "character varying", "char", "character", "string", "citext", "bpchar":
+		return true
+	default:
+		return false
+	}
+}
+
+func schemaRequiresPGTrgm(schema *models.Schema) bool {
+	if schema == nil {
+		return false
+	}
+	for _, table := range schema.Tables {
+		if table == nil {
+			continue
+		}
+		for _, index := range table.Indexes {
+			if index == nil || !strings.EqualFold(index.Type, "gin") {
+				continue
+			}
+			for _, colName := range index.Columns {
+				col, ok := resolveIndexColumn(table, colName)
+				if !ok || col == nil {
+					continue
+				}
+				if ginOperatorClassForColumn(col, index.Comment) == "gin_trgm_ops" {
+					return true
+				}
+			}
+		}
 	}
 	return false
 }
 
-// isTextTypeWithoutLength checks if type is text (which should convert to varchar when length is specified)
+func resolveIndexColumn(table *models.Table, colName string) (*models.Column, bool) {
-func isTextTypeWithoutLength(colType string) bool {
+	if table == nil {
-	return strings.EqualFold(colType, "text")
+		return nil, false
+	}
+	if col, ok := table.Columns[colName]; ok && col != nil {
+		return col, true
+	}
+
+	normalized := strings.ToLower(strings.Trim(colName, `"`))
+	for key, col := range table.Columns {
+		if col == nil {
+			continue
+		}
+		if strings.ToLower(strings.Trim(key, `"`)) == normalized {
+			return col, true
+		}
+		if strings.ToLower(strings.Trim(col.Name, `"`)) == normalized {
+			return col, true
+		}
+		if strings.ToLower(strings.Trim(col.SQLName(), `"`)) == normalized {
+			return col, true
+		}
+	}
+
+	return nil, false
 }
 
 // formatStringList formats a list of strings as a SQL-safe comma-separated quoted list

pkg/writers/pgsql/writer_test.go

@@ -87,6 +87,117 @@ func TestWriteDatabase(t *testing.T) {
 	}
 }
 
+func TestWriteDatabase_GinIndexOnTextArrayDoesNotUseTrigramOperatorClass(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("plans", "public")
+
+	tagsCol := models.InitColumn("tags", "plans", "public")
+	tagsCol.Type = "text[]"
+	table.Columns["tags"] = tagsCol
+
+	index := &models.Index{
+		Name:    "idx_plans_tags",
+		Type:    "gin",
+		Columns: []string{"tags"},
+	}
+	table.Indexes[index.Name] = index
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, `USING gin (tags array_ops)`) {
+		t.Fatalf("expected GIN index on array column with array_ops, got:\n%s", output)
+	}
+	if strings.Contains(output, "gin_trgm_ops") {
+		t.Fatalf("did not expect gin_trgm_ops for text[] column, got:\n%s", output)
+	}
+}
+
+func TestWriteDatabase_GinIndexOnQuotedTextColumnUsesTrigramOperatorClass(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("agent_personas", "public")
+
+	nameCol := models.InitColumn("name", "agent_personas", "public")
+	nameCol.Type = "text"
+	table.Columns["name"] = nameCol
+
+	index := &models.Index{
+		Name:    "idx_agent_personas_name_gin",
+		Type:    "gin",
+		Columns: []string{`"name"`},
+	}
+	table.Indexes[index.Name] = index
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, `CREATE EXTENSION IF NOT EXISTS pg_trgm`) {
+		t.Fatalf("expected trigram extension for text GIN index, got:\n%s", output)
+	}
+	if !strings.Contains(output, `USING gin (name gin_trgm_ops)`) {
+		t.Fatalf("expected quoted text GIN index to include gin_trgm_ops, got:\n%s", output)
+	}
+}
+
+func TestWriteDatabase_GinIndexOnJSONBUsesJSONBOperatorClass(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("learnings", "public")
+
+	detailsCol := models.InitColumn("details", "learnings", "public")
+	detailsCol.Type = "jsonb"
+	table.Columns["details"] = detailsCol
+
+	index := &models.Index{
+		Name:    "idx_learnings_details",
+		Type:    "gin",
+		Columns: []string{"details"},
+	}
+	table.Indexes[index.Name] = index
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, `USING gin (details jsonb_ops)`) {
+		t.Fatalf("expected GIN jsonb index to include jsonb_ops, got:\n%s", output)
+	}
+	if strings.Contains(output, "gin_trgm_ops") {
+		t.Fatalf("did not expect gin_trgm_ops for jsonb column, got:\n%s", output)
+	}
+}
+
 func TestWriteForeignKeys(t *testing.T) {
 	// Create a test database with two related tables
 	db := models.InitDatabase("testdb")
@@ -636,9 +747,14 @@ func TestPrimaryKeyExistenceCheck(t *testing.T) {
 		t.Errorf("Output missing logic to drop auto-generated primary key\nFull output:\n%s", output)
 	}
 
-	// Verify it checks for our specific named constraint before adding it
+	// Verify it compares the current primary key columns before dropping/recreating
-	if !strings.Contains(output, "constraint_name = 'pk_public_products'") {
+	if !strings.Contains(output, "current_pk_matches") || !strings.Contains(output, "ARRAY['id']") {
-		t.Errorf("Output missing check for our named primary key constraint\nFull output:\n%s", output)
+		t.Errorf("Output missing safe primary key comparison logic\nFull output:\n%s", output)
+	}
+
+	// Verify it only adds the desired key when no PK exists or an auto-generated mismatch was dropped
+	if !strings.Contains(output, "current_pk_name IS NULL") || !strings.Contains(output, "current_pk_name IN ('products_pkey', 'public_products_pkey')") {
+		t.Errorf("Output missing guarded primary key creation logic\nFull output:\n%s", output)
 	}
 }
 
@@ -729,6 +845,43 @@ func TestColumnSizeSpecifiers(t *testing.T) {
 	}
 }
 
+func TestWriteDatabase_PrimaryKeyTemplateDoesNotDropMatchingAutoPrimaryKey(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+	table := models.InitTable("learnings", "public")
+
+	idCol := models.InitColumn("id", "learnings", "public")
+	idCol.Type = "bigint"
+	idCol.IsPrimaryKey = true
+	table.Columns["id"] = idCol
+
+	parentCol := models.InitColumn("duplicate_of_learning_id", "learnings", "public")
+	parentCol.Type = "bigint"
+	table.Columns["duplicate_of_learning_id"] = parentCol
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "current_pk_matches") {
+		t.Fatalf("expected generated SQL to compare current PK columns, got:\n%s", output)
+	}
+	if !strings.Contains(output, "ARRAY['id']") {
+		t.Fatalf("expected generated SQL to compare against desired PK columns, got:\n%s", output)
+	}
+	if !strings.Contains(output, "NOT current_pk_matches") {
+		t.Fatalf("expected generated SQL to avoid dropping matching PKs, got:\n%s", output)
+	}
+}
+
 func TestGenerateColumnDefinition_PreservesExplicitTypeModifiers(t *testing.T) {
 	writer := NewWriter(&writers.WriterOptions{})
 
@@ -905,3 +1058,82 @@ func TestWriteAddColumnStatements(t *testing.T) {
 		t.Errorf("Output missing DO block\nFull output:\n%s", output)
 	}
 }
+
+func TestWriteSchema_EmitsGuardedAlterColumnTypeStatements(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("agent_skills", "public")
+
+	nameCol := models.InitColumn("name", "agent_skills", "public")
+	nameCol.Type = "character varying"
+	nameCol.Length = 255
+	table.Columns["name"] = nameCol
+
+	tagsCol := models.InitColumn("tags", "agent_skills", "public")
+	tagsCol.Type = "text[]"
+	table.Columns["tags"] = tagsCol
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "-- Alter column types for schema: public") {
+		t.Fatalf("expected alter column type section, got:\n%s", output)
+	}
+	if !strings.Contains(output, "pg_catalog.format_type") {
+		t.Fatalf("expected guarded live-type check, got:\n%s", output)
+	}
+	if !strings.Contains(output, "ALTER COLUMN name TYPE character varying(255)") {
+		t.Fatalf("expected guarded alter for character varying(255), got:\n%s", output)
+	}
+	if !strings.Contains(output, "ARRAY['varchar(255)', 'character varying(255)']") {
+		t.Fatalf("expected equivalent type spellings for varchar guard, got:\n%s", output)
+	}
+	if !strings.Contains(output, "ALTER COLUMN tags TYPE text[]") {
+		t.Fatalf("expected guarded alter for array type, got:\n%s", output)
+	}
+	if !strings.Contains(output, `ALTER COLUMN tags TYPE text[] USING tags::text[];`) {
+		t.Fatalf("expected guarded alter for array type to include USING cast, got:\n%s", output)
+	}
+}
+
+func TestWriteSchema_UsesStorageTypeForSerialAlterStatements(t *testing.T) {
+	db := models.InitDatabase("testdb")
+	schema := models.InitSchema("public")
+
+	table := models.InitTable("learnings", "public")
+	idCol := models.InitColumn("id", "learnings", "public")
+	idCol.Type = "bigserial"
+	table.Columns["id"] = idCol
+
+	schema.Tables = append(schema.Tables, table)
+	db.Schemas = append(db.Schemas, schema)
+
+	var buf bytes.Buffer
+	writer := NewWriter(&writers.WriterOptions{})
+	writer.writer = &buf
+
+	if err := writer.WriteDatabase(db); err != nil {
+		t.Fatalf("WriteDatabase failed: %v", err)
+	}
+
+	output := buf.String()
+	if !strings.Contains(output, "ALTER COLUMN id TYPE bigint") {
+		t.Fatalf("expected serial alter to use bigint storage type, got:\n%s", output)
+	}
+	if strings.Contains(output, "ALTER COLUMN id TYPE bigserial;") {
+		t.Fatalf("did not expect invalid bigserial alter statement, got:\n%s", output)
+	}
+	if !strings.Contains(output, `ALTER COLUMN id TYPE bigint USING id::bigint;`) {
+		t.Fatalf("expected serial alter to include USING cast, got:\n%s", output)
+	}
+}

pkg/writers/prisma/writer.go

@@ -61,7 +61,7 @@ func (w *Writer) databaseToPrisma(db *models.Database) string {
 	sb.WriteString("\n")
 
 	// Write generator block
-	sb.WriteString(w.generateGenerator())
+	sb.WriteString(w.generateGenerator(db))
 	sb.WriteString("\n")
 
 	// Process all schemas (typically just one in Prisma)
@@ -114,13 +114,28 @@ func (w *Writer) generateDatasource(db *models.Database) string {
 }
 
 // generateGenerator generates the generator block
-func (w *Writer) generateGenerator() string {
+func (w *Writer) generateGenerator(db *models.Database) string {
+	if w.usePrisma7Generator(db) {
+		return `generator client {
+  provider = "prisma-client"
+  output   = "./generated"
+}
+`
+	}
+
 	return `generator client {
   provider = "prisma-client-js"
 }
 `
 }
 
+func (w *Writer) usePrisma7Generator(db *models.Database) bool {
+	if w.options != nil && w.options.Prisma7 {
+		return true
+	}
+	return db != nil && db.SourceFormat == "prisma7"
+}
+
 // enumToPrisma converts an Enum to Prisma enum block
 func (w *Writer) enumToPrisma(enum *models.Enum) string {
 	var sb strings.Builder

pkg/writers/prisma/writer_test.go

@@ -0,0 +1,52 @@
+package prisma
+
+import (
+	"strings"
+	"testing"
+
+	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/writers"
+)
+
+func TestGenerateGenerator_DefaultsToPrismaClientJS(t *testing.T) {
+	t.Parallel()
+
+	writer := NewWriter(&writers.WriterOptions{})
+	db := models.InitDatabase("testdb")
+
+	got := writer.generateGenerator(db)
+	if !strings.Contains(got, `provider = "prisma-client-js"`) {
+		t.Fatalf("expected prisma-client-js generator, got:\n%s", got)
+	}
+	if strings.Contains(got, `output   = "./generated"`) {
+		t.Fatalf("did not expect prisma7 output path in default generator:\n%s", got)
+	}
+}
+
+func TestGenerateGenerator_Prisma7FlagUsesPrismaClient(t *testing.T) {
+	t.Parallel()
+
+	writer := NewWriter(&writers.WriterOptions{Prisma7: true})
+	db := models.InitDatabase("testdb")
+
+	got := writer.generateGenerator(db)
+	if !strings.Contains(got, `provider = "prisma-client"`) {
+		t.Fatalf("expected prisma-client generator, got:\n%s", got)
+	}
+	if !strings.Contains(got, `output   = "./generated"`) {
+		t.Fatalf("expected prisma7 output path, got:\n%s", got)
+	}
+}
+
+func TestGenerateGenerator_Prisma7SourceFormatUsesPrismaClient(t *testing.T) {
+	t.Parallel()
+
+	writer := NewWriter(&writers.WriterOptions{})
+	db := models.InitDatabase("testdb")
+	db.SourceFormat = "prisma7"
+
+	got := writer.generateGenerator(db)
+	if !strings.Contains(got, `provider = "prisma-client"`) {
+		t.Fatalf("expected prisma-client generator from source format, got:\n%s", got)
+	}
+}

pkg/writers/writer.go

@@ -20,6 +20,18 @@ type Writer interface {
 	WriteTable(table *models.Table) error
 }
 
+// NullableType constants control which Go package is used for nullable column types
+// in code-generation writers (Bun, GORM).
+const (
+	// NullableTypeResolveSpec uses github.com/bitechdev/ResolveSpec/pkg/spectypes
+	// (SqlString, SqlInt32, SqlVector, SqlStringArray, …). This is the default.
+	NullableTypeResolveSpec = "resolvespec"
+
+	// NullableTypeStdlib uses the standard library database/sql nullable types
+	// (sql.NullString, sql.NullInt32, …) and plain Go slices for arrays.
+	NullableTypeStdlib = "stdlib"
+)
+
 // WriterOptions contains common options for writers
 type WriterOptions struct {
 	// OutputPath is the path where the output should be written
@@ -33,6 +45,15 @@ type WriterOptions struct {
 	// Useful for databases like SQLite that do not support schemas.
 	FlattenSchema bool
 
+	// NullableTypes selects the Go type package used for nullable columns in
+	// code-generation writers (bun, gorm). Accepted values:
+	//   "resolvespec" (default) — github.com/bitechdev/ResolveSpec/pkg/spectypes
+	//   "stdlib"                — database/sql (sql.NullString, sql.NullInt32, …)
+	NullableTypes string
+
+	// Prisma7 enables Prisma 7-specific output for Prisma writers.
+	Prisma7 bool
+
 	// Additional options can be added here as needed
 	Metadata map[string]interface{}
 }
@@ -92,8 +113,12 @@ func SanitizeFilename(name string) string {
 // Examples (bigint):    "0"            → "0"
 // Examples (timestamp): "now()"        → "now()"   (function call – never quoted)
 func QuoteDefaultValue(value, sqlType string) string {
+	value = strings.TrimSpace(value)
+
 	// Function calls are never quoted regardless of column type.
-	if strings.Contains(value, "(") || strings.Contains(value, ")") {
+	if strings.Contains(value, "(") || strings.Contains(value, ")") ||
+		strings.Contains(value, "::") ||
+		strings.HasPrefix(strings.ToUpper(value), "ARRAY[") {
 		return value
 	}
 
@@ -103,6 +128,16 @@ func QuoteDefaultValue(value, sqlType string) string {
 		baseType = baseType[:idx]
 	}
 
+	if isArraySQLType(baseType) {
+		if arrayLiteral, ok := normalizeArrayDefaultLiteral(value); ok {
+			return quoteSQLLiteral(arrayLiteral)
+		}
+	}
+
+	if isQuotedSQLLiteral(value) {
+		return value
+	}
+
 	// Types whose default values must NOT be quoted.
 	unquotedTypes := map[string]bool{
 		// Integer types
@@ -136,7 +171,32 @@ func QuoteDefaultValue(value, sqlType string) string {
 
 	// Everything else (text, varchar, char, uuid, date, time, timestamp, json, …)
 	// is treated as a quoted literal.
-	return "'" + value + "'"
+	return quoteSQLLiteral(value)
+}
+
+func isArraySQLType(sqlType string) bool {
+	return strings.HasSuffix(sqlType, "[]")
+}
+
+func normalizeArrayDefaultLiteral(value string) (string, bool) {
+	switch {
+	case strings.HasPrefix(value, "''{") && strings.HasSuffix(value, "}''"):
+		return value[2 : len(value)-2], true
+	case strings.HasPrefix(value, "'{") && strings.HasSuffix(value, "}'"):
+		return value[1 : len(value)-1], true
+	case strings.HasPrefix(value, "{") && strings.HasSuffix(value, "}"):
+		return value, true
+	default:
+		return "", false
+	}
+}
+
+func isQuotedSQLLiteral(value string) bool {
+	return len(value) >= 2 && strings.HasPrefix(value, "'") && strings.HasSuffix(value, "'")
+}
+
+func quoteSQLLiteral(value string) string {
+	return "'" + strings.ReplaceAll(value, "'", "''") + "'"
 }
 
 // SanitizeStructTagValue sanitizes a value to be safely used inside Go struct tags.
@@ -147,7 +207,8 @@ func QuoteDefaultValue(value, sqlType string) string {
 // - 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*`)
+	// Require at least one character inside brackets to avoid stripping PostgreSQL array suffix "[]"
+	commentRegex := regexp.MustCompile(`\s*\[[^\]]+\]\s*`)
 	value = commentRegex.ReplaceAllString(value, "")
 
 	// Trim whitespace

pkg/writers/writer_test.go

@@ -0,0 +1,54 @@
+package writers
+
+import "testing"
+
+func TestQuoteDefaultValue(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name    string
+		value   string
+		sqlType string
+		want    string
+	}{
+		{
+			name:    "text default is quoted",
+			value:   "active",
+			sqlType: "text",
+			want:    "'active'",
+		},
+		{
+			name:    "array default from bare literal is quoted once",
+			value:   "{}",
+			sqlType: "text[]",
+			want:    "'{}'",
+		},
+		{
+			name:    "array default from quoted literal is preserved",
+			value:   "'{}'",
+			sqlType: "text[]",
+			want:    "'{}'",
+		},
+		{
+			name:    "array default from double quoted literal is normalized",
+			value:   "''{}''",
+			sqlType: "text[]",
+			want:    "'{}'",
+		},
+		{
+			name:    "function default is left alone",
+			value:   "now()",
+			sqlType: "timestamptz",
+			want:    "now()",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := QuoteDefaultValue(tt.value, tt.sqlType)
+			if got != tt.want {
+				t.Fatalf("QuoteDefaultValue(%q, %q) = %q, want %q", tt.value, tt.sqlType, got, tt.want)
+			}
+		})
+	}
+}