Remove unused events_by_room (#10421)

It looks like it was first used and introduced in 5130d80#diff-8a4a36a7728107b2ccaff2cb405dbab229a1100fe50653a63d1aa9ac10ae45e8R305 but the But the usage was removed in 4c6a31c#diff-8a4a36a7728107b2ccaff2cb405dbab229a1100fe50653a63d1aa9ac10ae45e8
matrix-org · Jul 19, 2021 · 7387d6f · 7387d6f
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commit 7387d6f
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diff --git a/changelog.d/10421.misc b/changelog.d/10421.misc
@@ -0,0 +1 @@
+Remove unused `events_by_room` code (tech debt).
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
@@ -2010,10 +2010,6 @@ def _update_backward_extremeties(self, txn, events):
 
         Forward extremities are handled when we first start persisting the events.
         """
-        events_by_room: Dict[str, List[EventBase]] = {}
-        for ev in events:
-            events_by_room.setdefault(ev.room_id, []).append(ev)
-
         query = (
             "INSERT INTO event_backward_extremities (event_id, room_id)"
             " SELECT ?, ? WHERE NOT EXISTS ("
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Remove unused `events_by_room` code (tech debt).