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-rw-r--r--synapse/storage/data_stores/main/schema/delta/56/state_group_room_idx.sql17
-rw-r--r--synapse/storage/data_stores/main/state.py7
2 files changed, 24 insertions, 0 deletions
diff --git a/synapse/storage/data_stores/main/schema/delta/56/state_group_room_idx.sql b/synapse/storage/data_stores/main/schema/delta/56/state_group_room_idx.sql
new file mode 100644
index 0000000000..7916ef18b2
--- /dev/null
+++ b/synapse/storage/data_stores/main/schema/delta/56/state_group_room_idx.sql
@@ -0,0 +1,17 @@
+/* Copyright 2019 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.
+ */
+
+INSERT INTO background_updates (update_name, progress_json) VALUES
+    ('state_groups_room_id_idx', '{}');
diff --git a/synapse/storage/data_stores/main/state.py b/synapse/storage/data_stores/main/state.py
index 36be8f0a9d..bf6de4ca22 100644
--- a/synapse/storage/data_stores/main/state.py
+++ b/synapse/storage/data_stores/main/state.py
@@ -1021,6 +1021,7 @@ class StateBackgroundUpdateStore(
     STATE_GROUP_INDEX_UPDATE_NAME = "state_group_state_type_index"
     CURRENT_STATE_INDEX_UPDATE_NAME = "current_state_members_idx"
     EVENT_STATE_GROUP_INDEX_UPDATE_NAME = "event_to_state_groups_sg_index"
+    STATE_GROUPS_ROOM_INDEX_UPDATE_NAME = "state_groups_room_id_idx"
 
     def __init__(self, db_conn, hs):
         super(StateBackgroundUpdateStore, self).__init__(db_conn, hs)
@@ -1044,6 +1045,12 @@ class StateBackgroundUpdateStore(
             table="event_to_state_groups",
             columns=["state_group"],
         )
+        self.register_background_index_update(
+            self.STATE_GROUPS_ROOM_INDEX_UPDATE_NAME,
+            index_name="state_groups_room_id_idx",
+            table="state_groups",
+            columns=["room_id"],
+        )
 
     @defer.inlineCallbacks
     def _background_deduplicate_state(self, progress, batch_size):