1 from datetime import datetime

     2 

     3 for rtype in ('cw_support', 'cw_dont_cross', 'cw_may_cross'):

     4     drop_relation_type(rtype)

     5 

     6 add_entity_type('CWSourceSchemaConfig')

     7 

     8 if not 'url' in schema['CWSource'].subjrels:

     9     add_attribute('CWSource', 'url')

    10     add_attribute('CWSource', 'parser')

    11     add_attribute('CWSource', 'latest_retrieval')