text: /* Copyright 2019 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.
   */
  
  /* delete room keys that belong to deleted room key version, or to room key
   * versions that don't exist (anymore)
   */
  DELETE FROM e2e_room_keys
  WHERE version NOT IN (
    SELECT version
    FROM e2e_room_keys_versions
    WHERE e2e_room_keys.user_id = e2e_room_keys_versions.user_id
    AND e2e_room_keys_versions.deleted = 0
  );
  