Fokko commented on issue #6442: [AIRFLOW-5771] Straighten out alembic migrations URL: https://github.com/apache/airflow/pull/6442#issuecomment-546705312 We never _want_ to have multiple heads. But sometimes it happens when someone works on a (long running) feature, and from a single revision, two migrations are being branched. For simplicity, you never want to have multiple heads I'd say. @dstandish suggested adding the following unit test: https://blog.jerrycodes.com/multiple-heads-in-alembic-migrations/. This one will detect when we have multiple heads, and fail.
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