const std::string SUMMARY_PERIOD_NAMES_ARRAY[] = {"yearly", "monthly", "daily", "minutely", "secondly"};
const std::string CALCULATION_TYPE_NAMES_ARRAY[] = {"sum", "delta", "min", "max", "mean"};
const std::string SUMMARY_PERIOD_NAMES_ARRAY[] = {"yearly", "monthly", "daily", "minutely", "secondly"};
const std::string CALCULATION_TYPE_NAMES_ARRAY[] = {"sum", "delta", "min", "max", "mean"};