code: def add(self, rid, data, raise_on_error=True):
          
          cache_data = {'cache-date': self._dt_to_epoch(datetime.now()), 'cache-data': data}
          return self.ds.post(rid, cache_data, raise_on_error)
docs: Write cache data to the data store.
  
          Args:
              rid (str): The record identifier.
              data (dict): The record data.
              raise_on_error (bool): If True and not r.ok this method will raise a RunTimeError.
  
          Returns:
              object : Python request response.