uranusjr commented on pull request #18968:
URL: https://github.com/apache/airflow/pull/18968#issuecomment-945139090


   As a side note, we are moving toward decoupling DAG runs against 
`execution_date` and removing the unique constraint eventually, and when that 
happens this code will become (semantically) incorrect. But until that happens, 
this is the correct thing to do, and wouldn't break anything even after the 
constraint's removal since it only adds a superfulous restriction on when DAG 
runs can be created, which is more appropriate than the functionality throwing 
exceptions right now.


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