support pgsql model generation

providers/database/database.go

@@ -28,6 +28,8 @@ func NewDatabase(config *config.Config) (*gorm.DB, error) {
 		return NewMySQL(config.Database.MySQL)
 	case DriverSQLite:
 		return NewSQLite(config.Database.SQLite)
+	case DriverPostgres:
+		return NewPostgres(config.Database.PostgreSQL)
 	}
 	return nil, errors.New("failed to connect to db")
 }