Remove redundant checks on room forgottenness

Fixes #3550

1 files changed, 0 insertions, 15 deletions

diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 02a802bed9..9eb5b18144 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -458,18 +458,6 @@ class RoomMemberWorkerStore(EventsWorkerStore):
     def _get_joined_hosts_cache(self, room_id):
         return _JoinedHostsCache(self, room_id)
 
-    @cached()
-    def who_forgot_in_room(self, room_id):
-        return self._simple_select_list(
-            table="room_memberships",
-            retcols=("user_id", "event_id"),
-            keyvalues={
-                "room_id": room_id,
-                "forgotten": 1,
-            },
-            desc="who_forgot"
-        )
-
 
 class RoomMemberStore(RoomMemberWorkerStore):
     def __init__(self, db_conn, hs):
@@ -578,9 +566,6 @@ class RoomMemberStore(RoomMemberWorkerStore):
             txn.execute(sql, (user_id, room_id))
 
             txn.call_after(self.did_forget.invalidate, (user_id, room_id))
-            self._invalidate_cache_and_stream(
-                txn, self.who_forgot_in_room, (room_id,)
-            )
         return self.runInteraction("forget_membership", f)
 
     @cachedInlineCallbacks(num_args=2)