diff --git a/synapse/storage/databases/main/__init__.py b/synapse/storage/databases/main/__init__.py
index 1dc347f0c9..5c21402dea 100644
--- a/synapse/storage/databases/main/__init__.py
+++ b/synapse/storage/databases/main/__init__.py
@@ -61,6 +61,7 @@ from .registration import RegistrationStore
from .rejections import RejectionsStore
from .relations import RelationsStore
from .room import RoomStore
+from .room_batch import RoomBatchStore
from .roommember import RoomMemberStore
from .search import SearchStore
from .session import SessionStore
@@ -81,6 +82,7 @@ class DataStore(
EventsBackgroundUpdatesStore,
RoomMemberStore,
RoomStore,
+ RoomBatchStore,
RegistrationStore,
StreamStore,
ProfileStore,
diff --git a/synapse/storage/databases/main/room_batch.py b/synapse/storage/databases/main/room_batch.py
new file mode 100644
index 0000000000..54fa361d3e
--- /dev/null
+++ b/synapse/storage/databases/main/room_batch.py
@@ -0,0 +1,36 @@
+# 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.
+
+from typing import Optional
+
+from synapse.storage._base import SQLBaseStore
+
+
+class RoomBatchStore(SQLBaseStore):
+ async def get_insertion_event_by_chunk_id(self, chunk_id: str) -> Optional[str]:
+ """Retrieve a insertion event ID.
+
+ Args:
+ chunk_id: The chunk ID of the insertion event to retrieve.
+
+ Returns:
+ The event_id of an insertion event, or None if there is no known
+ insertion event for the given insertion event.
+ """
+ return await self.db_pool.simple_select_one_onecol(
+ table="insertion_events",
+ keyvalues={"next_chunk_id": chunk_id},
+ retcol="event_id",
+ allow_none=True,
+ )
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