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  # Copyright 2013 OpenStack Foundation
  #
  #    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.
  
  import sqlalchemy as sql
  
  
  def upgrade(migrate_engine):
      meta = sql.MetaData()
      meta.bind = migrate_engine
      token = sql.Table('token', meta, autoload=True)
      idx = sql.Index('ix_token_valid', token.c.valid)
      idx.create(migrate_engine)
  
  
  def downgrade(migrate_engine):
      meta = sql.MetaData()
      meta.bind = migrate_engine
      token = sql.Table('token', meta, autoload=True)
      idx = sql.Index('ix_token_valid', token.c.valid)
      idx.drop(migrate_engine)
  