@cached_property
    def latest_diff_timestamp(self):
        ts_list = [m.latest_nonzero_refresh_timestamp for m in self.metrics]
        if not ts_list:
            return None
        try:
            return sorted(ts_list, reverse=True)[0]
        except __HOLE__:
            return None
dataset/ETHPy150Open Impactstory/total-impact-webapp/totalimpactwebapp/product.py/Product.latest_diff_timestamp