new_contents: """Add room notifications_enabled
  
  Revision ID: 57d33a15626a
  Revises: 1ae8ebf4bf79
  Create Date: 2014-09-25 17:35:53.944817
  """
  
  import sqlalchemy as sa
  from alembic import op
  
  
  # revision identifiers, used by Alembic.
  revision = '57d33a15626a'
  down_revision = '1ae8ebf4bf79'
  
  
  def upgrade():
      op.add_column('rooms', sa.Column('notifications_enabled', sa.Boolean(), nullable=False, server_default='true'),
                    schema='roombooking')
      op.alter_column('rooms', 'notifications_enabled', server_default=None, schema='roombooking')
  
  
  def downgrade():
      op.drop_column('rooms', 'notifications_enabled', schema='roombooking')
  
subject: Add migration revision