code: def unregister_signals_oaiset(self):
          
          from .models import OAISet
          from .receivers import after_insert_oai_set, \
              after_update_oai_set, after_delete_oai_set
          if contains(OAISet, 'after_insert', after_insert_oai_set):
              remove(OAISet, 'after_insert', after_insert_oai_set)
              remove(OAISet, 'after_update', after_update_oai_set)
              remove(OAISet, 'after_delete', after_delete_oai_set)
docs: Unregister signals oaiset.