feat: Adds helper functions for migrations (#31303)

superset/migrations/shared/constraints.py

@@ -19,10 +19,8 @@ from __future__ import annotations
 from dataclasses import dataclass
 
 from alembic import op
-from sqlalchemy.dialects.sqlite.base import SQLiteDialect  # noqa: E402
 from sqlalchemy.engine.reflection import Inspector
 
-from superset.migrations.shared.utils import has_table
 from superset.utils.core import generic_find_fk_constraint_name
 
 
@@ -73,23 +71,3 @@ def redefine(
             ondelete=on_delete,
             onupdate=on_update,
         )
-
-
-def drop_fks_for_table(table_name: str) -> None:
-    """
-    Drop all foreign key constraints for a table if it exist and the database
-    is not sqlite.
-
-    :param table_name: The table name to drop foreign key constraints for
-    """
-    connection = op.get_bind()
-    inspector = Inspector.from_engine(connection)
-
-    if isinstance(connection.dialect, SQLiteDialect):
-        return  # sqlite doesn't like constraints
-
-    if has_table(table_name):
-        foreign_keys = inspector.get_foreign_keys(table_name)
-
-        for fk in foreign_keys:
-            op.drop_constraint(fk["name"], table_name, type_="foreignkey")