2 files changed, 39 insertions, 0 deletions
diff --git a/synapse/storage/schema/__init__.py b/synapse/storage/schema/__init__.py
index ea900e0f3d..151f2aa9bb 100644
--- a/synapse/storage/schema/__init__.py
+++ b/synapse/storage/schema/__init__.py
@@ -60,6 +60,7 @@ Changes in SCHEMA_VERSION = 68:
       new events.
 
 Changes in SCHEMA_VERSION = 69:
+    - We now write to `device_lists_changes_in_room` table.
     - Use sequence to generate future `application_services_txns.txn_id`s
 """
 
diff --git a/synapse/storage/schema/main/delta/69/01device_list_oubound_by_room.sql b/synapse/storage/schema/main/delta/69/01device_list_oubound_by_room.sql
new file mode 100644
index 0000000000..b5b1782b2a
--- /dev/null
+++ b/synapse/storage/schema/main/delta/69/01device_list_oubound_by_room.sql
@@ -0,0 +1,38 @@
+/* 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.
+ */
+
+CREATE TABLE device_lists_changes_in_room (
+    user_id TEXT NOT NULL,
+    device_id TEXT NOT NULL,
+    room_id TEXT NOT NULL,
+
+    -- This initially matches `device_lists_stream.stream_id`. Note that we
+    -- delete older values from `device_lists_stream`, so we can't use a foreign
+    -- constraint here.
+    --
+    -- The table will contain rows with the same `stream_id` but different
+    -- `room_id`, as for each device update we store a row per room the user is
+    -- joined to. Therefore `(stream_id, room_id)` gives a unique index.
+    stream_id BIGINT NOT NULL,
+
+    -- We have a background process which goes through this table and converts
+    -- entries into rows in `device_lists_outbound_pokes`. Once we have processed
+    -- a row, we mark it as such by setting `converted_to_destinations=TRUE`.
+    converted_to_destinations BOOLEAN NOT NULL,
+    opentracing_context TEXT
+);
+
+CREATE UNIQUE INDEX device_lists_changes_in_stream_id ON device_lists_changes_in_room(stream_id, room_id);
+CREATE INDEX device_lists_changes_in_stream_id_unconverted ON device_lists_changes_in_room(stream_id) WHERE NOT converted_to_destinations;