def METHOD_NAME(
    self, instrument_strategy: instrumentStrategy, period_days: int
) -> dict:
    instrument_strategy_key = instrument_strategy.key
    dict_of_keys = {
        INSTRUMENT_STRATEGY_KEY: instrument_strategy_key,
        PERIOD_KEY: period_days,
    }
    try:
        result_dict = self.mongo_data.get_result_dict_for_dict_keys(dict_of_keys)
    except missingData:
        result_dict = self._get_old_style_trade_limit_as_dict_or_missing_data(
            instrument_strategy, period_days
        )
    return result_dict