new_contents: """merge 2833890da9bd and 6708baa8438
  
  Revision ID: 2f83f4f1b63d
  Revises: 2833890da9bd, 6708baa8438
  Create Date: 2017-12-31 03:34:29.810707
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '2f83f4f1b63d'
  down_revision = ('2833890da9bd', '6708baa8438')
  branch_labels = None
  depends_on = None
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      pass
  
  
  def downgrade():
      pass
  
subject: add alembic merge of two heads