refactor: validation at the DAOs level

superset/connectors/sqla/models.py

@@ -66,7 +66,6 @@
     relationship,
     RelationshipProperty,
     Session,
-    validates,
 )
 from sqlalchemy.orm.mapper import Mapper
 from sqlalchemy.schema import UniqueConstraint
@@ -831,17 +830,6 @@ def init_on_load(self) -> None:
     def __repr__(self) -> str:
         return str(self.column_name)
 
-    @validates("python_date_format")
-    def validate_pdf_is_iso8601(self, _: str, dt_format: str) -> str:
-        if dt_format in ("epoch_s", "epoch_ms", None):
-            return dt_format
-        try:
-            dt_str = datetime.now().strftime(dt_format)
-            dateutil.parser.isoparse(dt_str)
-        except ValueError as ex:
-            raise ValueError("python_date_format is invalid ISO 8601 format") from ex
-        return dt_format
-
     @property
     def is_boolean(self) -> bool:
         """