Update Rate

https://developers.ccdata.io/documentation/legacy/Price/SingleSymbolPriceEndpoint/

pragma solidity ^0.8.0;

library LoanUtils {
    struct RateData {
        uint256 lastRate;
        uint256 currentRate;
        uint256 lastUpdateTimestamp;
    }
}

contract NebeusLending is Ownable {
    using LoanUtils for LoanUtils.RateData;

    mapping(string => LoanUtils.RateData) public rateData; // Currency to rate mapping
    uint256 public rateRequestFrequency = 2 hours;

    event RateUpdated(string currency, uint256 lastRate, uint256 currentRate, uint256 timestamp);

    /**
     * @notice Updates the exchange rate for a specific currency
     * @param currency The symbol of the currency (e.g., "ETH")
     * @param currentRate The new rate for the currency
     */
    function updateRate(string memory currency, uint256 currentRate) external onlyOwner {
        LoanUtils.RateData storage rate = rateData[currency];

        // Ensure enough time has passed since the last update
        require(
            block.timestamp >= rate.lastUpdateTimestamp + rateRequestFrequency,
            "Rate update frequency not met"
        );

        // Update the rates
        rate.lastRate = rate.currentRate;
        rate.currentRate = currentRate;
        rate.lastUpdateTimestamp = block.timestamp;

        emit RateUpdated(currency, rate.lastRate, rate.currentRate, block.timestamp);
    }
}