old_contents: """add TI state index
  
  Revision ID: 211e584da130
  Revises: 2e82aab8ef20
  Create Date: 2016-06-30 10:54:24.323588
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '211e584da130'
  down_revision = '2e82aab8ef20'
  branch_labels = None
  depends_on = None
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.create_index('ti_state', 'task_instance', ['state'], unique=False)
  
  def downgrade():
      op.drop_index('ti_state', table_name='task_instance')
  
new_contents: # -*- coding: utf-8 -*-
  #
  # 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.
  
  """add TI state index
  
  Revision ID: 211e584da130
  Revises: 2e82aab8ef20
  Create Date: 2016-06-30 10:54:24.323588
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '211e584da130'
  down_revision = '2e82aab8ef20'
  branch_labels = None
  depends_on = None
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.create_index('ti_state', 'task_instance', ['state'], unique=False)
  
  def downgrade():
      op.drop_index('ti_state', table_name='task_instance')
  
subject: Add license to migration file