new_contents: """empty message
  
  Revision ID: 75f579d01f0d
  Revises: 25f4f234760c
  Create Date: 2017-05-06 23:15:02.228272
  
  """
  from alembic import op
  import sqlalchemy as sa
  
  
  # revision identifiers, used by Alembic.
  revision = '75f579d01f0d'
  down_revision = '25f4f234760c'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('graphs', sa.Column('short_url', sa.String(), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('graphs', 'short_url')
      # ### end Alembic commands ###
  
subject: Add short_url column to Graph