new_contents: """display_name
  
  Add display_name field to User (again)
  
  Revision ID: 551819450a3c
  Revises: 187dd4ba924a
  Create Date: 2013-04-08 21:43:51.436466
  
  """
  #
  #
  
  # revision identifiers, used by Alembic.
  revision = '551819450a3c'
  down_revision = '187dd4ba924a'
  
  from alembic import op
  from alembic.operations import Operations as op
  import sqlalchemy as sa
  
  
  
  def upgrade():
      op.add_column('users', sa.Column('display_name', sa.Unicode(255), nullable=True, default=None))
  
  
  def downgrade():
      op.drop_column('users', 'display_name')
  
subject: Add migration script for added display_name column in a4919a7