Add a migration step to cleanup potential leftovers of bug 11833 (#12784)

Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>

2 files changed, 20 insertions, 0 deletions

diff --git a/changelog.d/12784.bugfix b/changelog.d/12784.bugfix
new file mode 100644
index 0000000000..a958f9a16b
--- /dev/null
+++ b/changelog.d/12784.bugfix
@@ -0,0 +1 @@
+Delete events from the `federation_inbound_events_staging` table when a room is purged through the admin API.
diff --git a/synapse/storage/schema/main/delta/70/01clean_table_purged_rooms.sql b/synapse/storage/schema/main/delta/70/01clean_table_purged_rooms.sql
new file mode 100644
index 0000000000..aed79635b2
--- /dev/null
+++ b/synapse/storage/schema/main/delta/70/01clean_table_purged_rooms.sql
@@ -0,0 +1,19 @@
+/* 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.
+ */
+
+-- Clean up left over rows from bug #11833, which was fixed in #12770.
+DELETE FROM federation_inbound_events_staging WHERE room_id not in (
+    SELECT room_id FROM rooms
+);