kaxil commented on a change in pull request #13921:
URL: https://github.com/apache/airflow/pull/13921#discussion_r566513043



##########
File path: airflow/migrations/versions/cf5dc11e79ad_drop_user_and_chart.py
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@@ -47,7 +47,12 @@ def upgrade():  # noqa: D103
 
     if 'known_event' in tables:
         for fkey in inspector.get_foreign_keys(table_name="known_event", 
referred_table="users"):
-            op.drop_constraint(fkey['name'], 'known_event', type_="foreignkey")
+            if conn.dialect.name == "sqlite":
+                if fkey['name']:
+                    with op.batch_alter_table(table_name='known_event') as bop:
+                        bop.drop_constraint(fkey['name'], type_="foreignkey")
+            else:
+                op.drop_constraint(fkey['name'], 'known_event', 
type_="foreignkey")

Review comment:
       Removed the conditional to check DB, went with the approach Tomek 
suggested




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