text: # Copyright 2013 Intel Corporation
  #
  #    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
  from sqlalchemy import MetaData
  from sqlalchemy import Table
  from sqlalchemy import Integer
  
  
  def upgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      # Add a new column metrics to save metrics info for compute nodes
      quota_usages = Table('quota_usages', meta, autoload=True)
      shadow_quota_usages = Table('shadow_quota_usages', meta, autoload=True)
  
      allocated = Column('allocated', Integer, nullable=False)
      shadow_allocated= Column('allocated', Integer, nullable=False)
      quota_usages.create_column(allocated)
      shadow_quota_usages.create_column(shadow_allocated)
  
  
  def downgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      # Remove the new column
      quota_usages = Table('quota_usages', meta, autoload=True)
      shadow_quota_usages = Table('shadow_quota_usages', meta, autoload=True)
  
      quota_usages.drop_column('allocated')
      shadow_quota_usages.drop_column('allocated')
  