MatrixSynapse/synapse/storage/schema/delta/40/device_inbox.sql

/* Copyright 2016 OpenMarket Ltd
 *
 * 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.
 */

-- turn the pre-fill startup query into a index-only scan on postgresql.
INSERT into background_updates (update_name, progress_json)
    VALUES ('device_inbox_stream_index', '{}');

INSERT into background_updates (update_name, progress_json, depends_on)
    VALUES ('device_inbox_stream_drop', '{}', 'device_inbox_stream_index');