feat: add events

script/Deploy.sol

@@ -9,8 +9,6 @@ import {ERC20} from "solmate/tokens/ERC20.sol";
 import {IPool, IRewardsController} from "yield-daddy/aave-v3/AaveV3ERC4626.sol";
 
 contract Deploy is Script {
-  error UnsupportedChain();
-
   struct VaultDeploymentParams {
     address token;
     address aToken;
@@ -24,6 +22,8 @@ contract Deploy is Script {
     VaultDeploymentParams[] vaults;
   }
 
+  error UnsupportedChain();
+
   function getDeploymentParams(
     uint256 chainId
   ) internal pure returns (DeploymentParams memory params) {

src/contracts/Grateful.sol

@@ -137,12 +137,14 @@ contract Grateful is IGrateful, Ownable2Step {
   ) external onlyOwner {
     tokensWhitelisted[_token] = true;
     IERC20(_token).safeIncreaseAllowance(address(aavePool), type(uint256).max);
+    emit TokenAdded(_token);
   }
 
   /// @inheritdoc IGrateful
   function addVault(address _token, address _vault) external onlyOwner onlyWhenTokenWhitelisted(_token) {
     vaults[_token] = AaveV3Vault(_vault);
     IERC20(_token).safeIncreaseAllowance(address(_vault), type(uint256).max);
+    emit VaultAdded(_token, _vault);
   }
 
   /// @inheritdoc IGrateful
@@ -282,18 +284,21 @@ contract Grateful is IGrateful, Ownable2Step {
     uint256 _newFee
   ) external onlyOwner {
     fee = _newFee;
+    emit FeeUpdated(_newFee);
   }
 
   /// @inheritdoc IGrateful
   function setCustomFee(uint256 _newFee, address _merchant) external onlyOwner {
     customFees[_merchant] = CustomFee({isSet: true, fee: _newFee});
+    emit CustomFeeUpdated(_merchant, _newFee);
   }
 
   /// @inheritdoc IGrateful
   function unsetCustomFee(
     address _merchant
   ) external onlyOwner {
     delete customFees[_merchant];
+    emit CustomFeeUnset(_merchant);
   }
 
   /*//////////////////////////////////////////////////////////////

src/interfaces/IGrateful.sol

@@ -59,6 +59,38 @@ interface IGrateful {
    */
   event Withdraw(address indexed user, address indexed token, uint256 amount);
 
+  /**
+   * @notice Emitted when the default fee is updated.
+   * @param newFee The new fee in basis points.
+   */
+  event FeeUpdated(uint256 newFee);
+
+  /**
+   * @notice Emitted when a custom fee is set for a merchant.
+   * @param merchant Address of the merchant.
+   * @param newFee The new custom fee in basis points.
+   */
+  event CustomFeeUpdated(address indexed merchant, uint256 newFee);
+
+  /**
+   * @notice Emitted when a custom fee is unset for a merchant.
+   * @param merchant Address of the merchant.
+   */
+  event CustomFeeUnset(address indexed merchant);
+
+  /**
+   * @notice Emitted when a new token is added to the whitelist.
+   * @param token Address of the token added.
+   */
+  event TokenAdded(address indexed token);
+
+  /**
+   * @notice Emitted when a new vault is added for a token.
+   * @param token Address of the token.
+   * @param vault Address of the vault added.
+   */
+  event VaultAdded(address indexed token, address indexed vault);
+
   /*///////////////////////////////////////////////////////////////
                                   ERRORS
     //////////////////////////////////////////////////////////////*/