ephraimbuddy opened a new pull request, #44397:
URL: https://github.com/apache/airflow/pull/44397

   In dagcode, fileloc_hash column was a primary key on the version before dag 
versioning. If dagcode is not deleted before downgrading, the fileloc_hash 
column, created when downgrading, would be a null column that can't be used for 
a primary key. A similar thing applies to serialized dag, which would have 
duplicates, and the primary key can't be determined. The solution is to delete 
the dag_version table data, which will delete the serdag and dagcode table data
   
   


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