    function addStaticCommissionRecord(address userAddress, uint256 time, uint256 amount) private {
        CommissionRecord[9] storage records = staticCommissionRecordMapping[userAddress];
        for (uint256 i = 8; i > 0; --i) {
            CommissionRecord memory prevRecord = records[i - 1];
            records[i] = prevRecord;
        }
        records[0] = CommissionRecord(time, amount);
    }