fix(pgsql): handle default values for array types in migrations

* update default value quoting logic for PostgreSQL
* add tests for array default value handling

pkg/writers/pgsql/migration_writer.go

@@ -329,7 +329,11 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 			// Column doesn't exist, add it
 			defaultVal := ""
 			if modelCol.Default != nil {
-				defaultVal = fmt.Sprintf("%v", modelCol.Default)
+				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{
@@ -382,7 +386,11 @@ func (w *MigrationWriter) generateAlterTableScripts(schema *models.Schema, model
 				setDefault := modelCol.Default != nil
 				defaultVal := ""
 				if setDefault {
-					defaultVal = fmt.Sprintf("%v", modelCol.Default)
+					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{

pkg/writers/pgsql/migration_writer_test.go

@@ -57,6 +57,46 @@ 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_WithAudit(t *testing.T) {
 	// Current database (empty)
 	current := models.InitDatabase("testdb")

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
@@ -495,7 +496,11 @@ func BuildCreateTableData(schemaName string, table *models.Table) CreateTableDat
 			NotNull: col.NotNull,
 		}
 		if col.Default != nil {
-			colData.Default = fmt.Sprintf("%v", col.Default)
+			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/writer.go

@@ -523,15 +523,7 @@ 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
-			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)))
-			}
+			parts = append(parts, fmt.Sprintf("DEFAULT %s", writers.QuoteDefaultValue(stripBackticks(v), col.Type)))
 		case bool:
 			parts = append(parts, fmt.Sprintf("DEFAULT %v", v))
 		default: