docs: def clean(self):
          """Delete all of the records"""
  
          # Deleting seems to be really weird and unrelable.
          self._session \
              .query(Process) \
              .filter(Process.d_vid == self._d_vid) \
              .delete(synchronize_session='fetch')
  
          for r in self.records:
              self._session.delete(r)
  
          self._session.commit()