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Add schema comments about the destinations and destination_rooms tables. (#15247)

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reivilibre 2023-03-15 09:25:58 +00:00 committed by GitHub
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changelog.d/15247.misc Normal file
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Add schema comments about the `destinations` and `destination_rooms` tables.

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synapse/storage/schema/main/delta/74/90COMMENTS_destinations.sql.postgres Normal file
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/* 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.
*/
--- destinations
COMMENT ON TABLE destinations IS
'Information about remote homeservers and the health of our connection to them.';
COMMENT ON COLUMN destinations.destination IS 'server name of remote homeserver in question';
COMMENT ON COLUMN destinations.last_successful_stream_ordering IS
$$Stream ordering of the most recently successfully sent PDU to this server, sent through normal send (not e.g. backfill).
In Catch-Up Mode, the original PDU persisted by us is represented here, even if we sent a later forward extremity in its stead.
See `destination_rooms` for more information about catch-up.$$;
COMMENT ON COLUMN destinations.retry_last_ts IS
$$The last time we tried and failed to reach the remote server, in ms.
This field is reset to `0` when we succeed in connecting again.$$;
COMMENT ON COLUMN destinations.retry_interval IS
$$How long, in milliseconds, to wait since the last time we tried to reach the remote server before trying again.
This field is reset to `0` when we succeed in connecting again.$$;
COMMENT ON COLUMN destinations.failure_ts IS
$$The first time we tried and failed to reach the remote server, in ms.
This field is reset to `NULL` when we succeed in connecting again.$$;
--- destination_rooms
COMMENT ON TABLE destination_rooms IS
'Information about transmission of PDUs in a given room to a given remote homeserver.';
COMMENT ON COLUMN destination_rooms.destination IS 'server name of remote homeserver in question';
COMMENT ON COLUMN destination_rooms.room_id IS 'room ID in question';
COMMENT ON COLUMN destination_rooms.stream_ordering IS
$$`stream_ordering` of the most recent PDU in this room that needs to be sent (by us) to this homeserver.
This can only be pointing to our own PDU because we are only responsible for sending our own PDUs.$$;