Speed up membership queries for users with forgotten rooms (#15385)

1 files changed, 19 insertions, 0 deletions

diff --git a/synapse/storage/schema/main/delta/74/03_room_membership_index.sql b/synapse/storage/schema/main/delta/74/03_room_membership_index.sql
new file mode 100644

index 0000000000..81a7d9ff9c
--- /dev/null
+++ b/synapse/storage/schema/main/delta/74/03_room_membership_index.sql
@@ -0,0 +1,19 @@
+/* Copyright 2023 The Matrix.org Foundation C.I.C
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+-- Add an index to `room_membership(user_id, room_id)` to make querying for
+-- forgotten rooms faster.
+INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
+    (7403, 'room_membership_user_room_index', '{}');