feat: nested price feeds return proper update timestamp (#62)

* feat: nested price feeds return proper update timestamp

* chore: update license to `GPL-2.0-or-later`

* test: modify unit tests to check update timestamps

Author: lekhovitsky

LICENSE

@@ -16,7 +16,7 @@ This repository is subject to the Gearbox bug bounty program, per the terms defi
 
 ## Licensing
 
-The primary license for the Gearbox-protocol/integrations-v2 is the Business Source License 1.1 (BUSL-1.1), see [LICENSE](/LICENSE). The files which are NOT licensed under the BUSL-1.1 have appropriate SPDX headers.
+The primary license for the Gearbox-protocol/oracles-v3 is the GNU General Public License v2.0 or later (GPL-2.0-or-later), see [LICENSE](/LICENSE). The files which are NOT licensed under the GPL-2.0-or-later have appropriate SPDX headers.
 
 ## Disclaimer
 

README.md

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 import {IPriceFeed} from "@gearbox-protocol/core-v3/contracts/interfaces/base/IPriceFeed.sol";
@@ -35,6 +35,7 @@ interface ILPPriceFeed is IPriceFeed {
     function lowerBound() external view returns (uint256);
     function upperBound() external view returns (uint256);
 
+    function getAggregatePriceAndTimestamp() external view returns (int256 answer, uint256 updatedAt);
     function getAggregatePrice() external view returns (int256 answer);
     function getLPExchangeRate() external view returns (uint256 exchangeRate);
     function getScale() external view returns (uint256 scale);

contracts/interfaces/ILPPriceFeed.sol

@@ -1,4 +1,4 @@
-(c) Gearbox Foundation, 2024.
+(c) Gearbox Foundation, 2025.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

contracts/interfaces/LICENSE

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 interface IBalancerStablePool {

contracts/interfaces/balancer/IBalancerStablePool.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 interface IBalancerVault {

contracts/interfaces/balancer/IBalancerVault.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 interface IBalancerWeightedPool {

contracts/interfaces/balancer/IBalancerWeightedPool.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 interface ICurvePool {

contracts/interfaces/curve/ICurvePool.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 interface IstETHPoolGateway {

contracts/interfaces/curve/IstETHPoolGateway.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // Gearbox Protocol. Generalized leverage for DeFi protocols
-// (c) Gearbox Foundation, 2024.
+// (c) Gearbox Foundation, 2025.
 pragma solidity ^0.8.23;
 
 interface IwstETH {