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/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)
 	}