test(drawdb): add test for converting column types with modifiers

* Implement tests to ensure explicit type modifiers are preserved during conversion.
* Validate behavior for varchar, numeric, and custom vector types.

pkg/writers/drizzle/type_mapper.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
+	"git.warky.dev/wdevs/relspecgo/pkg/pgsql"
 )
 
 // TypeMapper handles SQL to Drizzle type conversions
@@ -18,7 +19,7 @@ func NewTypeMapper() *TypeMapper {
 // SQLTypeToDrizzle converts SQL types to Drizzle column type functions
 // Returns the Drizzle column constructor (e.g., "integer", "varchar", "text")
 func (tm *TypeMapper) SQLTypeToDrizzle(sqlType string) string {
-	sqlTypeLower := strings.ToLower(sqlType)
+	sqlTypeLower := pgsql.CanonicalizeBaseType(pgsql.ExtractBaseTypeLower(sqlType))
 
 	// PostgreSQL type mapping to Drizzle
 	typeMap := map[string]string{
@@ -87,13 +88,6 @@ func (tm *TypeMapper) SQLTypeToDrizzle(sqlType string) string {
 		return drizzleType
 	}
 
-	// Check for partial matches (e.g., "varchar(255)" -> "varchar")
-	for sqlPattern, drizzleType := range typeMap {
-		if strings.HasPrefix(sqlTypeLower, sqlPattern) {
-			return drizzleType
-		}
-	}
-
 	// Default to text for unknown types
 	return "text"
 }