About smart contract which i develop.

[GaurangBharadava]

I need your concerns for the smart contract i have develop for GasLess transaction forwarder contract.

Here is the contract:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {ECDSA} from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import {MessageHashUtils} from "@openzeppelin/contracts/utils/cryptography/MessageHashUtils.sol";
import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract GasLessForwarder is Ownable, ReentrancyGuard {

    constructor() Ownable(msg.sender) {

    }

    mapping(bytes32 => bool) private _executed; //Mappings for cheching that the transaction is executed or not.

    struct Transaction {
        address sender; // caller or owner
        address dest; // destination contrat to call.
        uint256 value; //ETH value which can be sent.
        bytes data; // The function data to be executed on the contract.
        uint256 deadline; //A deadline to execute the transaction.
    }

    // this functions will aloow this contract to hold money or funds on behalf of user.
    receive() external payable { }

    fallback() external payable { }

    function executeTransaction(Transaction calldata txn, bytes calldata signature) external  onlyOwner {
        require(block.timestamp <= txn.deadline, "Deadline is missed");
        require(_verifySignature(txn, signature), "Signer is not valid");

        bytes32 txHash = keccak256(abi.encode(txn));
        require(_executed[txHash] == true, "Transaction already executed");

        (bool ok,) = address(payable(txn.dest)).call{value: txn.value}(txn.data);
        require(ok, "Transaction failed");

        _executed[txHash] = true;
    }

    function _verifySignature(Transaction calldata txn, bytes calldata signature) internal pure returns(bool) {
        bytes32 txHash = keccak256(abi.encode(txn.sender, txn.dest, txn.value, txn.data, txn.deadline));
        bytes32 ethSignedMessage = MessageHashUtils.toEthSignedMessageHash(txHash);//This will convert transaction hash to eth compatible transaction hash.
        address signer = ECDSA.recover(ethSignedMessage, signature);

        return (txn.sender == signer);
    }

    function withdraw() external onlyOwner nonReentrant {
        (bool ok,) = address(payable(msg.sender)).call{value:address(this).balance}("");
        require(ok, "Withdrawel failed");
    }
}

This contract ensures that user does not have to hold their funds on their own And they can do transaction off chain then execute them on chain. So This is simple idea for that.
I need your suggestions about this contract.
I took help from AI and AA section in this course.

[EngrPips]

When you said they can do transactions off chain do you mean they can sign transactions off-chain?

[GaurangBharadava]

Yeah.

[GaurangBharadava]

Can you assist me for this ?

[EngrPips]

I will look as soon as I can sir.

[GaurangBharadava]

Okay Take your time.