How to index events from a contract via multicall?

You need to ensure that the subgraph's ABI has all the events coming from both smart contracts and the right contract is used as the data source for the handlers. Depending on whether the multicall is doing a regular call or a delegatecall, the contract emitting the event will be the callee or the multicall contract, respectively.

To make long story short, follow these steps:

1. Identify the smart contracts involved: Determine the addresses or names of the smart contracts whose events you want to include in the subgraph's ABI.

2. Retrieve the event definitions: Access the source code or documentation of each smart contract to find the event definitions. These definitions specify the structure and parameters of each event.

3. Create a new subgraph: If you haven't already, create a new subgraph using a subgraph development framework like Graph Protocol. This framework allows you to define the entities, attributes, and event handlers for your subgraph.

4. Define the entities: Identify the entities that your subgraph will track. These entities represent the data you want to index and query. Define the attributes for each entity, specifying the data you want to store.

5. Add event handlers: In your subgraph's schema file, define event handlers for each event you want to include. These event handlers specify how the subgraph should process and index the events.

6. Include event definitions: In the event handlers, include the event definitions from both smart contracts. This ensures that the subgraph recognizes and processes events from both sources.

7. Build and deploy the subgraph: Use the subgraph development framework to build and deploy your subgraph. This process compiles your subgraph's code and deploys it to a hosting service.

8. Test and verify: Once deployed, test your subgraph by querying for data and verifying that the events from both smart contracts are being indexed correctly.

By following these steps, you can ensure that the subgraph's ABI includes all the events coming from both smart contracts. This allows you to effectively track and query the data generated by these contracts.