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.

1 files changed, 4 insertions, 0 deletions

diff --git a/synapse/_scripts/synapse_port_db.py b/synapse/_scripts/synapse_port_db.py
index 9586086c03..9c06c837dc 100755
--- a/synapse/_scripts/synapse_port_db.py
+++ b/synapse/_scripts/synapse_port_db.py
@@ -58,6 +58,9 @@ from synapse.storage.databases.main.client_ips import ClientIpBackgroundUpdateSt
 from synapse.storage.databases.main.deviceinbox import DeviceInboxBackgroundUpdateStore
 from synapse.storage.databases.main.devices import DeviceBackgroundUpdateStore
 from synapse.storage.databases.main.end_to_end_keys import EndToEndKeyBackgroundStore
+from synapse.storage.databases.main.event_push_actions import (
+    EventPushActionsWorkerStore,
+)
 from synapse.storage.databases.main.events_bg_updates import (
     EventsBackgroundUpdatesStore,
 )
@@ -199,6 +202,7 @@ R = TypeVar("R")
 
 
 class Store(
+    EventPushActionsWorkerStore,
     ClientIpBackgroundUpdateStore,
     DeviceInboxBackgroundUpdateStore,
     DeviceBackgroundUpdateStore,