new_contents: from sqlalchemy import *
  from migrate import *
  
  meta = MetaData()
  
  def upgrade(migrate_engine):
      meta.bind = migrate_engine
      dataset = Table('dataset', meta, autoload=True)
  
      serp_title = Column('serp_title', Unicode())
      serp_title.create(dataset)
  
      serp_teaser = Column('serp_teaser', Unicode())
      serp_teaser.create(dataset) 
  
  
subject: Migrate in domain model changes