old_contents: # -*- coding: utf-8 -*-
  # 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.
  
  from synapse.storage.database import Database
  from synapse.storage.prepare_database import prepare_database
  
  
  class DataStores(object):
      """The various data stores.
  
      These are low level interfaces to physical databases.
      """
  
      def __init__(self, main_store_class, db_conn, hs):
          # Note we pass in the main store here as workers use a different main
          # store.
          database = Database(hs)
  
          # Check that db is correctly configured.
          database.engine.check_database(db_conn.cursor())
  
          prepare_database(db_conn, database.engine, config=hs.config)
  
          self.main = main_store_class(database, db_conn, hs)
  
new_contents: # -*- coding: utf-8 -*-
  # 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.
  
  from synapse.storage.database import Database
  from synapse.storage.prepare_database import prepare_database
  
  
  class DataStores(object):
      """The various data stores.
  
      These are low level interfaces to physical databases.
      """
  
      def __init__(self, main_store_class, db_conn, hs):
          # Note we pass in the main store class here as workers use a different main
          # store.
          database = Database(hs)
  
          # Check that db is correctly configured.
          database.engine.check_database(db_conn.cursor())
  
          prepare_database(db_conn, database.engine, config=hs.config)
  
          self.main = main_store_class(database, db_conn, hs)
  
subject: Fix comment