new_contents: """Add taxi phone number on hail
  
  Revision ID: 4190b0aefe23
  Revises: 46971b48dc06
  Create Date: 2015-06-22 19:12:57.417551
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '4190b0aefe23'
  down_revision = '46971b48dc06'
  
  from alembic import op
  import sqlalchemy as sa
  from sqlalchemy.dialects import postgresql
  
  def upgrade():
      op.add_column('hail', sa.Column('taxi_phone_number', sa.String(), nullable=True))
  
  
  def downgrade():
      op.drop_column('hail', 'taxi_phone_number')
  
subject: Add taxi phone number