docs: def is_old(self):
          """
          Is the object cached for too long, so it should be redownloaded?
  
          See :attr:`.DB_MAX_WAIT_TIME` and :attr:`.DB_CACHE_TIME` for details.
  
          Returns:
              bool: True if it is.
          """
          if not self.processing_started_ts:
              return True
  
          if self.processing_ended_ts:
              return self.processing_ended_ts + DB_CACHE_TIME < time.time()
  
          # in case that processing started, but didn't ended in
          # DB_MAX_WAIT_TIME
          expected_end_ts = self.creation_ts + DB_MAX_WAIT_TIME
          if expected_end_ts < time.time():
              logger.error("Prosessing timeouted and properites were not set!")
  
          return expected_end_ts < time.time()