Replace REP price feed on Aave v1

src/20231031_AaveV1Ethereum_FixedREPPriceFeed/AaveV1Ethereum_FixedREPPriceFeed_20231031.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import {IProposalGenericExecutor} from 'aave-helpers/interfaces/IProposalGenericExecutor.sol';
+import {IAaveOracle} from 'aave-address-book/AaveV2.sol';
+
+/**
+ * @title Fixed REP price feed on AAVE v1
+ * @author BGD labs (@bgdlabs)
+ * - Discussion: https://governance.aave.com/t/bgd-technical-maintenance-proposals/15274/2
+ */
+contract AaveV1Ethereum_FixedREPPriceFeed_20231031 is IProposalGenericExecutor {
+  address public constant REP = 0x1985365e9f78359a9B6AD760e32412f4a445E862;
+  address public constant REP_ADAPTER = 0xc7751400F809cdB0C167F87985083C558a0610F7;
+  address public constant AAVE_V1_ORACLE = 0x76B47460d7F7c5222cFb6b6A75615ab10895DDe4;
+
+  function execute() external {
+    address[] memory assets = new address[](1);
+    address[] memory sources = new address[](1);
+
+    assets[0] = REP;
+    sources[0] = REP_ADAPTER;
+
+    IAaveOracle(AAVE_V1_ORACLE).setAssetSources(assets, sources);
+  }
+}

src/20231031_AaveV1Ethereum_FixedREPPriceFeed/AaveV1Ethereum_FixedREPPriceFeed_20231031.t.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import {AaveV2Ethereum} from 'aave-address-book/AaveV2Ethereum.sol';
+
+import 'forge-std/Test.sol';
+import {CommonTestBase} from 'aave-helpers/CommonTestBase.sol';
+import {IAaveOracle} from 'aave-address-book/AaveV2.sol';
+import {AaveV1Ethereum_FixedREPPriceFeed_20231031} from './AaveV1Ethereum_FixedREPPriceFeed_20231031.sol';
+
+/**
+ * @dev Test for AaveV1Ethereum_FixedREPPriceFeed_20231031
+ * command: make test-contract filter=AaveV1Ethereum_FixedREPPriceFeed_20231031
+ */
+contract AaveV1Ethereum_FixedREPPriceFeed_20231031_Test is CommonTestBase {
+  AaveV1Ethereum_FixedREPPriceFeed_20231031 internal proposal;
+
+  address public constant REP = 0x1985365e9f78359a9B6AD760e32412f4a445E862;
+  address public constant REP_ADAPTER = 0xc7751400F809cdB0C167F87985083C558a0610F7;
+  address public constant AAVE_V1_ORACLE = 0x76B47460d7F7c5222cFb6b6A75615ab10895DDe4;
+
+  function setUp() public {
+    vm.createSelectFork(vm.rpcUrl('mainnet'), 18470486);
+    proposal = new AaveV1Ethereum_FixedREPPriceFeed_20231031();
+  }
+
+  /**
+   * @dev executes the generic test suite including e2e and config snapshots
+   */
+  function test_proposalExecution() public {
+    executePayload(vm, address(proposal));
+
+    IAaveOracle oracle = IAaveOracle(AAVE_V1_ORACLE);
+    address newSource = oracle.getSourceOfAsset(REP);
+    assertEq(newSource, REP_ADAPTER);
+
+    assertEq(oracle.getAssetPrice(REP), 462569569300000);
+  }
+}

src/20231031_AaveV1Ethereum_FixedREPPriceFeed/FixedREPPriceFeedOnAAVEV1.md

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+---
+title: "Fixed REP price feed on AAVE v1"
+author: "BGD labs (@bgdlabs)"
+discussions: "https://governance.aave.com/t/bgd-technical-maintenance-proposals/15274/2"
+---
+
+## Simple Summary
+
+Replace existing REP/ETH price feed by Chainlink on Aave v1 Ethereum with a fixed price adapter.
+
+## Motivation
+
+The REP asset listed on Aave 1 Ethereum is a legacy one, that long time ago has suffered a token migration.
+With a total supply of this legacy `REP` on Aave v1 of less than $100, Chainlink is looking to shut down the REP/ETH price feed, but this can only be done if Aave stops using it.
+Consequently, giving the size of the asset and that factually is off-boarded (frozen), we propose to replace the Chainlink price feed by an ad-hoc one that will return a constant value: the average price of the token for the period from 01/09/2023 till 31/10/2023.
+
+## Specification
+
+Average `REP` price to use: 0.0004625695693 ETH
+
+- call `IAaveOracle(AAVE_V1_ORACLE).setAssetSources([0x1985365e9f78359a9B6AD760e32412f4a445E862], [0xc7751400F809cdB0C167F87985083C558a0610F7])` to replace the price feed of the `REP` on Aave v1 Pool.
+
+## References
+
+- Implementation: [AaveV1Ethereum](https://github.com/bgd-labs/aave-proposals-v3/blob/main/src/20231031_AaveV2Ethereum_FixedREPPriceFeed/AaveV2Ethereum_FixedREPPriceFeedOnAAVEV1_20231031.sol)
+- Tests: [AaveV1Ethereum](https://github.com/bgd-labs/aave-proposals-v3/blob/main/src/20231031_AaveV2Ethereum_FixedREPPriceFeedOnAAVEV1/AaveV1Ethereum_FixedREPPriceFeed_20231031.t)
+- [Discussion](https://governance.aave.com/t/bgd-technical-maintenance-proposals/15274/2)
+
+- [REP token](https://etherscan.io/address/0x1985365e9f78359a9B6AD760e32412f4a445E862)
+- [REP / ETH adapter](https://github.com/bgd-labs/cl-synchronicity-price-adapter/blob/main/src/contracts/RepFixedPriceAdapter.sol)
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).

src/20231031_AaveV1Ethereum_FixedREPPriceFeed/FixedREPPriceFeedOnAAVEV1_20231031.s.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import {GovV3Helpers, IPayloadsControllerCore, PayloadsControllerUtils} from 'aave-helpers/GovV3Helpers.sol';
+import {EthereumScript} from 'aave-helpers/ScriptUtils.sol';
+import {AaveV1Ethereum_FixedREPPriceFeed_20231031} from './AaveV1Ethereum_FixedREPPriceFeed_20231031.sol';
+
+/**
+ * @dev Deploy Ethereum
+ * command: make deploy-ledger contract=src/20231031_AaveV1Ethereum_FixedREPPriceFeed/FixedREPPriceFeedOnAAVEV1_20231031.s.sol:DeployEthereum chain=mainnet
+ */
+contract DeployEthereum is EthereumScript {
+  function run() external broadcast {
+    // deploy payloads
+    AaveV1Ethereum_FixedREPPriceFeed_20231031 payload0 = new AaveV1Ethereum_FixedREPPriceFeed_20231031();
+
+    // compose action
+    IPayloadsControllerCore.ExecutionAction[]
+      memory actions = new IPayloadsControllerCore.ExecutionAction[](1);
+    actions[0] = GovV3Helpers.buildAction(address(payload0));
+
+    // register action at payloadsController
+    GovV3Helpers.createPayload(actions);
+  }
+}
+
+/**
+ * @dev Create Proposal
+ * command: make deploy-ledger contract=src/20231031_AaveV1Ethereum_FixedREPPriceFeed/FixedREPPriceFeedOnAAVEV1_20231031.s.sol:CreateProposal chain=mainnet
+ */
+contract CreateProposal is EthereumScript {
+  function run() external {
+    // create payloads
+    PayloadsControllerUtils.Payload[] memory payloads = new PayloadsControllerUtils.Payload[](1);
+
+    // compose actions for validation
+    IPayloadsControllerCore.ExecutionAction[]
+      memory actionsEthereum = new IPayloadsControllerCore.ExecutionAction[](1);
+    actionsEthereum[0] = GovV3Helpers.buildAction(0xBdD1458A6d399C88D4509275e4463485C6c86Ef3);
+    payloads[0] = GovV3Helpers.buildMainnetPayload(vm, actionsEthereum);
+
+    // create proposal
+    vm.startBroadcast();
+    GovV3Helpers.createProposal2_5(
+      payloads,
+      GovV3Helpers.ipfsHashFile(
+        vm,
+        'src/20231031_AaveV1Ethereum_FixedREPPriceFeed/FixedREPPriceFeedOnAAVEV1_20231031.s.sol'
+      )
+    );
+  }
+}