kaxil commented on pull request #13920:
URL: https://github.com/apache/airflow/pull/13920#issuecomment-768390805


   > I think creating but catching the integrity error is better - otherwise 
it's still prone to a race condition.
   > 
   > (With the locking it shouldn't go on under normal circumstances, but it's 
More Correct to catch the integrity error instead and protects against more 
cases)
   
   I actually did start with that, but the problem is the session needs to be 
rollback'd all the way if we get an Integrity error


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