diff --git a/synapse/storage/databases/main/group_server.py b/synapse/storage/databases/main/group_server.py
index e70d3649ff..bb621df0dd 100644
--- a/synapse/storage/databases/main/group_server.py
+++ b/synapse/storage/databases/main/group_server.py
@@ -13,15 +13,20 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from typing import Any, Dict, List, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple
from typing_extensions import TypedDict
from synapse.api.errors import SynapseError
from synapse.storage._base import SQLBaseStore, db_to_json
+from synapse.storage.database import DatabasePool
+from synapse.storage.types import Connection
from synapse.types import JsonDict
from synapse.util import json_encoder
+if TYPE_CHECKING:
+ from synapse.server import HomeServer
+
# The category ID for the "default" category. We don't store as null in the
# database to avoid the fun of null != null
_DEFAULT_CATEGORY_ID = ""
@@ -35,6 +40,16 @@ class _RoomInGroup(TypedDict):
class GroupServerWorkerStore(SQLBaseStore):
+ def __init__(self, database: DatabasePool, db_conn: Connection, hs: "HomeServer"):
+ database.updates.register_background_index_update(
+ update_name="local_group_updates_index",
+ index_name="local_group_updates_stream_id_index",
+ table="local_group_updates",
+ columns=("stream_id",),
+ unique=True,
+ )
+ super().__init__(database, db_conn, hs)
+
async def get_group(self, group_id: str) -> Optional[Dict[str, Any]]:
return await self.db_pool.simple_select_one(
table="groups",
diff --git a/synapse/storage/schema/main/delta/65/04_local_group_updates.sql b/synapse/storage/schema/main/delta/65/04_local_group_updates.sql
new file mode 100644
index 0000000000..a178abfe12
--- /dev/null
+++ b/synapse/storage/schema/main/delta/65/04_local_group_updates.sql
@@ -0,0 +1,18 @@
+/* Copyright 2021 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.
+ */
+
+-- Check index on `local_group_updates.stream_id`.
+INSERT INTO background_updates (ordering, update_name, progress_json) VALUES
+ (6504, 'local_group_updates_index', '{}');
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