text: /* 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.
   */
  
  -- Add a column to track what to_device stream id that this application
  -- service has been caught up to.
  
  -- NULL indicates that this appservice has never received any to_device messages. This
  -- can be used, for example, to avoid sending a huge dump of messages at startup.
  ALTER TABLE application_services_state ADD COLUMN to_device_stream_id BIGINT;