  function executeOperation(
    address[] calldata assets,
    uint256[] calldata amounts,
    uint256[] calldata premiums,
    address,
    bytes calldata params
  ) external returns (bool) {
    require(msg.sender == address(lendingPool), "SV002");
    (Operation operation, bytes memory operationParams) = abi.decode(params, (Operation, bytes));
    IERC20 asset = IERC20(assets[0]);
    uint256 flashloanRepayAmount = amounts[0] + premiums[0];
    if (operation == Operation.LEVERAGE) {
      leverageOperation(asset, flashloanRepayAmount, operationParams);
    }
    if (operation == Operation.REBALANCE) {
      rebalanceOperation(asset, amounts[0], flashloanRepayAmount, operationParams);
    }
    if (operation == Operation.EMPTY) {
      emptyVaultOperation(asset, amounts[0], flashloanRepayAmount, operationParams);
    }

    asset.approve(address(lendingPool), flashloanRepayAmount);
    return true;
  }
  function aggregatorSwap(
    uint256 dexIndex,
    IERC20 token,
    uint256 amount,
    bytes memory dexTxData
  ) internal {
    (address proxy, address router) = _dexAP.dexMapping(dexIndex);
    require(proxy != address(0) && router != address(0), "SV201"); 
    token.approve(proxy, amount);
    router.call(dexTxData);
  }
