code: def clear(self):
          
          # mark this task as incomplete
          self.mark_incomplete()
  
          # Delete the indicator metadata, this also deletes values by cascading.
          for suffix in list(CLIMATE_SEASON_SUFFIXES.values()):
              try:
                  # noinspection PyUnresolvedReferences
                  indicator = self.session.query(models.ClimateIndicator) \
                      .filter(models.ClimateIndicator.description == self.description + suffix) \
                      .one()
                  self.session.delete(indicator)
              except NoResultFound:
                  # Data didn't exist yet, no problem
                  pass
  
          self.close_session()
docs: Clear output of one climate variable