text: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # 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.
  
  from sqlalchemy import Column, Index, MetaData, String, Table
  
  
  def upgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      instance_faults = Table('instance_faults', meta, autoload=True)
      host = Column('host', String(length=255))
      instance_faults.create_column(host)
      Index('instance_faults_host_idx', instance_faults.c.host).create(
              migrate_engine)
  
  
  def downgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      instance_faults = Table('instance_faults', meta, autoload=True)
      instance_faults.drop_column('host')
  