code: def db_upgrade(version=None):
      
      v1 = get_db_version()
      migrate_api.upgrade(url=db_url, repository=db_repo, version=version)
      v2 = get_db_version()
  
      if v1 == v2:
          print 'Database already up-to-date.'
      else:
          print 'Upgraded: %s ... %s' % (v1, v2)
docs: Upgrade the database