jgao54 commented on issue #4421: [AIRFLOW-3468] Remove KnownEvent(Event)? URL: https://github.com/apache/airflow/pull/4421#issuecomment-453435480 +1 on deleting under-utilized features :P I see that CI/CD is still failing on ```sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (3730, "Cannot drop table 'users' referenced by a foreign key constraint 'known_event_ibfk_2' on table 'known_event'.") [SQL: '\nDROP TABLE users']``` I think this is happening when attempting `airflow reset` in the ci/cd scripts, which in turn looks for all the tables that the sqlalchemy engine can find, and then delete them. But since the code for KnownEvent/KnownEventType models is removed, those tables didn't get detected/deleted, so now the `user` table can't get deleted because `known_event` has a reference to it. I think we will need to modify the ci/cd script and explicitly add a `drop table known_event; drop table known_event_type;` now... maybe there's a better way to do that. In addition, @Fokko if you do a grep on `known_events` instead of `knownevent`, there are quite a few changes in the alembic scripts, but I don't see any problems with it since they are just creating/upgrading tables.
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