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5a359ac660
Historically we preserve chunk metadata because the old format of the Continuous Aggregate has the `chunk_id` column in the materialization hypertable so in order to don't have chunk ids left over there we just mark it as dropped when dropping chunks. In #4269 we introduced a new Continuous Aggregate format that don't store the `chunk_id` in the materialization hypertable anymore so it's safe to also remove the metadata when dropping chunk and all associated Continuous Aggregates are in the new format. Also added a post-update SQL script to cleanup unnecessary dropped chunk metadata in our catalog. Closes #6570