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This helps prevent wraparound on exceedingly large and old installs, particularly Zulip Cloud. These are relatively simple migrations since they are not referenced by any other tables; however, they are quite large, and are actively used from Django by running servers, making this not a migration which is possible to run without stopping the server. Use the escape hatch in the previous commit to temporarily pause analytics writes while the migration happens. This should make the migration transparent to users, at the small cost of an artificial dip in statistics (specifically, to push notification counts, and unread message counts) while the migration runs.