nytai edited a comment on issue #13033:
URL: https://github.com/apache/superset/issues/13033#issuecomment-776222980


   @ITStitch This migration is trying to merge the old alerts models into a the 
new models. Looks like your db has some records that violate the new uniqueness 
constraints on the new models. I suspect you have various alerts records that 
have an empty `database_id` field. I'd suggest you delete those records and 
attempt the migration again.   


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