parisni commented on issue #19822:
URL: https://github.com/apache/airflow/issues/19822#issuecomment-979415050


   @potiuk @kaxil 
   see the log in the issue (not my last comment) they are indeed comming from 
the scheduler.
   
   ```
    duplicate key value violates unique constraint "serialized_dag_pkey"
   DETAIL:  Key (dag_id)=(test_dag_454) already exists.    
    scheduler [SQL: INSERT INTO serialized_dag (dag_id, fileloc, fileloc_hash, 
data, last_updated, dag_hash) VALUES (%(dag_id)s, %(fileloc)s, 
%(fileloc_hash)s, scheduler [parameters: {'dag_id': 'test_dag_454', 'fileloc': 
'/opt/airflow/dags/repo/test_dag_454.py', 'fileloc_hash': 14390114031793844, 
'data': '{"__vers  scheduler (Background on this error at: 
http://sqlalche.me/e/13/gkpj)
   ```


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