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David Taylor c0293339b8 PERF: Do not enqueue digest emails when attempted recently (#10849) ... Previously, Jobs::EnqueueDigestEmails would enqueue a digest job for every user, even if there are no topics to send. The digest job would exit, no email would send, and last_emailed_at would not change. 30 minutes later, Jobs::EnqueueDigestEmails would run again and re-enqueue jobs for the same users. 120fa8ad introduced a temporary mitigation for this issue, by randomly selecting a subset of those users each time. This commit adds a new `digest_attempted_at` column to the `user_stats` table. This column is updated every time a digest job completes for a user. Using this, we can avoid scheduling digest jobs for the same user every 30 minutes. This also removes the random user selection in 120fa8ad, and instead prioritizes users who had digests attempted the longest time ago.		2020-10-07 15:30:38 +01:00
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fixtures	FIX: Use a mutex when reseting column information while seeding.	2020-06-23 09:15:47 +08:00
migrate	PERF: Do not enqueue digest emails when attempted recently (#10849)	2020-10-07 15:30:38 +01:00
post_migrate	PERF: Keep track of first unread PM and first unread group PM for user.	2020-09-09 14:05:41 +08:00
api_test_seeds.rb	DEV: enable frozen string literal on all files	2019-05-13 09:31:32 +08:00