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Speed up `get_unread_event_push_actions_by_room` (#13005) Fixes #11887 hopefully. The core change here is that `event_push_summary` now holds a summary of counts up until a much more recent point, meaning that the range of rows we need to count in `event_push_actions` is much smaller. This needs two major changes: 1. When we get a receipt we need to recalculate `event_push_summary` rather than just delete it 2. The logic for deleting `event_push_actions` is now divorced from calculating `event_push_summary`. In future it would be good to calculate `event_push_summary` while we persist a new event (it should just be a case of adding one to the relevant rows in `event_push_summary`), as that will further simplify the get counts logic and remove the need for us to periodically update `event_push_summary` in a background job.

2022-06-15 17:17:14 +02:00

Reduce DB usage of `/sync` when a large number of unread messages have recently been sent in a room.