text: /* Copyright 2015, 2016 OpenMarket 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.
   */
  
  
  CREATE TABLE IF NOT EXISTS room_tags(
      user_id TEXT NOT NULL,
      room_id TEXT NOT NULL,
      tag     TEXT NOT NULL,  -- The name of the tag.
      content TEXT NOT NULL,  -- The JSON content of the tag.
      CONSTRAINT room_tag_uniqueness UNIQUE (user_id, room_id, tag)
  );
  
  CREATE TABLE IF NOT EXISTS room_tags_revisions (
      user_id TEXT NOT NULL,
      room_id TEXT NOT NULL,
      stream_id BIGINT NOT NULL, -- The current version of the room tags.
      CONSTRAINT room_tag_revisions_uniqueness UNIQUE (user_id, room_id)
  );
  
  CREATE TABLE IF NOT EXISTS private_user_data_max_stream_id(
      Lock CHAR(1) NOT NULL DEFAULT 'X' UNIQUE,  -- Makes sure this table only has one row.
      stream_id  BIGINT NOT NULL,
      CHECK (Lock='X')
  );
  
  INSERT INTO private_user_data_max_stream_id (stream_id) VALUES (0);
  