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@ -678,6 +678,11 @@ class RoomMemberWorkerStore(EventsWorkerStore):
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# to see if any have subsequently been updated. This is done so that
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# we can use a partial index on `forgotten = 1` on the assumption
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# that few users will actually forget many rooms.
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#
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# Note that a room is considered "forgotten" if *all* membership
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# events for that user and room have the forgotten field set (as
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# when a user forgets a room we update all rows for that user and
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# room, not just the current one).
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sql = """
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SELECT room_id, (
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SELECT count(*) FROM room_memberships
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