new_contents: """maintain history for compatibility with earlier migrations
  
  Revision ID: 13eb55f81627
  Revises: 1507a7289a2f
  Create Date: 2015-08-23 05:12:49.732174
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '13eb55f81627'
  down_revision = '1507a7289a2f'
  branch_labels = None
  depends_on = None
  
  def upgrade():
      pass
  
  def downgrade():
      pass
subject: add version for compatibility