'Add new ticker subscriber.
Args:
store_key (str): Unique storage hash.
args (any, optional): Arguments to send to the hook method.'

def add(self, store_key, *args, **kwargs):

    (_, _, _, interval, _, _) = store_key
    if (not interval):
        log_err(_ERROR_ADD_TICKER.format(store_key=store_key))
        return
    if (interval not in self.tickers):
        self.tickers[interval] = self.ticker_class(interval)
    self.tickers[interval].add(store_key, *args, **kwargs)
