diff --git a/synapse/storage/databases/main/purge_events.py b/synapse/storage/databases/main/purge_events.py
index f6822707e4..9213ce0b5a 100644
--- a/synapse/storage/databases/main/purge_events.py
+++ b/synapse/storage/databases/main/purge_events.py
@@ -419,6 +419,7 @@ class PurgeEventsStore(StateGroupWorkerStore, CacheInvalidationWorkerStore):
"event_forward_extremities",
"event_push_actions",
"event_search",
+ "event_failed_pull_attempts",
"partial_state_events",
"events",
"federation_inbound_events_staging",
@@ -441,6 +442,10 @@ class PurgeEventsStore(StateGroupWorkerStore, CacheInvalidationWorkerStore):
"e2e_room_keys",
"event_push_summary",
"pusher_throttle",
+ "insertion_events",
+ "insertion_event_extremities",
+ "insertion_event_edges",
+ "batch_events",
"room_account_data",
"room_tags",
# "rooms" happens last, to keep the foreign keys in the other tables
diff --git a/synapse/storage/schema/__init__.py b/synapse/storage/schema/__init__.py
index 68e055c664..f29424d17a 100644
--- a/synapse/storage/schema/__init__.py
+++ b/synapse/storage/schema/__init__.py
@@ -83,6 +83,8 @@ Changes in SCHEMA_VERSION = 73;
event_push_summary, receipts_linearized, and receipts_graph.
- Add table `event_failed_pull_attempts` to keep track when we fail to pull
events over federation.
+ - Add indexes to various tables (`event_failed_pull_attempts`, `insertion_events`,
+ `batch_events`) to make it easy to delete all associated rows when purging a room.
"""
diff --git a/synapse/storage/schema/main/delta/73/02room_id_indexes_for_purging.sql b/synapse/storage/schema/main/delta/73/02room_id_indexes_for_purging.sql
new file mode 100644
index 0000000000..6d38bdd430
--- /dev/null
+++ b/synapse/storage/schema/main/delta/73/02room_id_indexes_for_purging.sql
@@ -0,0 +1,22 @@
+/* Copyright 2022 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 index so we can easily purge all rows from a given `room_id`
+CREATE INDEX IF NOT EXISTS event_failed_pull_attempts_room_id ON event_failed_pull_attempts(room_id);
+
+-- MSC2716 related tables:
+-- Add indexes so we can easily purge all rows from a given `room_id`
+CREATE INDEX IF NOT EXISTS insertion_events_room_id ON insertion_events(room_id);
+CREATE INDEX IF NOT EXISTS batch_events_room_id ON batch_events(room_id);
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