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e66aee0416
This might help alleviate DB transaction contention on the PollMessage table. A lower transaction isolation level is safe because acking a poll message is idempotent: there are only two things it does, either delete a poll message or take a recurring one from the past and set it to be a year in the future from the date in the past. Both of these operations will always yield the same final result even if executed multiple times simultaneously for some reason.