Add config option to forget rooms automatically when users leave them (#15224)

This is largely based off the stats and user directory updater code.

Signed-off-by: Sean Quah <seanq@matrix.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/synapse/storage/schema/main/delta/76/04_add_room_forgetter.sql b/synapse/storage/schema/main/delta/76/04_add_room_forgetter.sql
new file mode 100644
index 0000000000..be4b57d86f
--- /dev/null
+++ b/synapse/storage/schema/main/delta/76/04_add_room_forgetter.sql
@@ -0,0 +1,24 @@
+/* Copyright 2023 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.
+ */
+
+CREATE TABLE room_forgetter_stream_pos (
+    Lock CHAR(1) NOT NULL DEFAULT 'X' UNIQUE,  -- Makes sure this table only has one row.
+    stream_id  BIGINT NOT NULL,
+    CHECK (Lock='X')
+);
+
+INSERT INTO room_forgetter_stream_pos (
+    stream_id
+) SELECT COALESCE(MAX(stream_ordering), 0) from events;