potiuk commented on issue #15150:
URL: https://github.com/apache/airflow/issues/15150#issuecomment-1121125655

   > Seems strange to have that unique constraint. If two DAG runs have 
different run_ids, why not let them run at the same time?
   
   Because historically execution date was the key not run_id. This has since 
been removed and in Airflow 2.2 the primary key is run_id and execution_date is 
just a field. See the changelo. 
https://airflow.apache.org/docs/apache-airflow/2.2.4/changelog.html#airflow-2-2-0-2021-10-11


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