synapse/storage/schema/main/delta/58/14events_instance_name.sql.postgres


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

/* Copyright 2020 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 SEQUENCE IF NOT EXISTS events_stream_seq;

SELECT setval('events_stream_seq', (
    SELECT COALESCE(MAX(stream_ordering), 1) FROM events
));

CREATE SEQUENCE IF NOT EXISTS events_backfill_stream_seq;

-- If the server has never backfilled a room then doing `-MIN(...)` will give
-- a negative result, hence why we do `GREATEST(...)`
SELECT setval('events_backfill_stream_seq', (
    SELECT GREATEST(COALESCE(-MIN(stream_ordering), 1), 1) FROM events
));