hankehly commented on issue #22336:
URL: https://github.com/apache/airflow/issues/22336#issuecomment-1088149845

   @nominee1997 I haven't looked through the code, but the cli docs show a 
`--reset-dagruns` flag that may be useful for this purpose. Have you 
experimented with this?
   
   > If reset_dag_run option is used, backfill will first prompt users whether 
airflow should clear all the previous dag_run and task_instances within the 
backfill date range.
   
   
https://airflow.apache.org/docs/apache-airflow/stable/cli-and-env-variables-ref.html#Named%20Arguments_repeat10


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