ephraimbuddy opened a new pull request, #27538:
URL: https://github.com/apache/airflow/pull/27538

   What happened was that the DatasetDagRunQueue(DDRQ) was updated before the 
change in the consumer dag.
   During sync to db, the dataset was marked for deletion from the dag causing 
the primary key in DDRQ to be nullified which threw an error. 
   The solution was to add cascade deletion on DagScheduleDatasetReference 
relation to DDRQ so that when DagScheduleDatasetReference object is marked for 
deletion the DDRQ object will also be marked
   
   


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