new_contents: """add max_taxi_duration_to_pt
  
  Revision ID: 6f2635ce00b4
  Revises: 858b24967ff2
  Create Date: 2019-12-04 12:12:42.130204
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '6f2635ce00b4'
  down_revision = '858b24967ff2'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.add_column('instance', sa.Column('max_taxi_duration_to_pt', sa.Integer(), nullable=False))
  
  
  def downgrade():
      op.drop_column('instance', 'max_taxi_duration_to_pt')
  
subject: add missing migration file