text: /* Copyright 2017 New Vector 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.
   */
  
  -- drop the unique constraint on deleted_pushers so that we can just insert
  -- into it rather than upserting.
  
  CREATE TABLE deleted_pushers2 (
      stream_id BIGINT NOT NULL,
      app_id TEXT NOT NULL,
      pushkey TEXT NOT NULL,
      user_id TEXT NOT NULL
  );
  
  INSERT INTO deleted_pushers2 (stream_id, app_id, pushkey, user_id)
      SELECT stream_id, app_id, pushkey, user_id from deleted_pushers;
  
  DROP TABLE deleted_pushers;
  ALTER TABLE deleted_pushers2 RENAME TO deleted_pushers;
  
  -- create the index after doing the inserts because that's more efficient.
  -- it also means we can give it the same name as the old one without renaming.
  CREATE INDEX deleted_pushers_stream_id ON deleted_pushers (stream_id);
  
  