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6bd34afa0d
This requires part 1 (which can take hours to run but generally doesn't require downtime) to be completed first. This portion of the migration will require the server to be completely down for a brief period; for chat.zulip.org with 250M UserMessage rows, it took about 60s to run; that time will vary depending on hardware details like whether the server has an SSD, but fundamentally shouldn't be long. Our upgrade-zulip and upgrade-zulip-from-git tools can apply this migration correctly; nothing special needs to be done. Fixes #13040.