Add ERC721 example app

[0xOlias]

This PR adds an ERC271 example app for the Smol Brains NFT collection on Arbitrum. I also noticed some RPC provider inconsistencies while testing this out. Specifically, Alchemy seems to rename transaction.type to transaction.arbType for some bizarre reason. Quicknode works as expected.

I've ran into enough issues related to this specific field that it may be worth making it nullable in the database, but for now I added a default of "0x0" so that Alchemy still works.

Also fixed a bug where block.baseFeePerGas was (wrongly) assumed to be non-null when formatting event objects coming out of the event store.

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[wyze]

Specifically, Alchemy seems to rename transaction.type to transaction.arbType for some bizarre reason. Quicknode works as expected.

Thanks, I noticed as well and I couldn't tell where this was used in the codebase and seemed to be stored for history. I patched my local version to make the database field nullable and things were working as expected.

[0xOlias]

Specifically, Alchemy seems to rename transaction.type to transaction.arbType for some bizarre reason. Quicknode works as expected.

Thanks, I noticed as well and I couldn't tell where this was used in the codebase and seemed to be stored for history. I patched my local version to make the database field nullable and things were working as expected.

Ah, makes sense. While we're here - any other patches you had to make?

FYI, the reason we store transaction.type (and many other somewhat niche transaction and block data) is that the event.transaction object passed to user-provided event handlers aims to match the viem Transaction type. Same goes for event.block.

[wyze]

Ah, makes sense. While we're here - any other patches you had to make?

I haven't got it tested yet, waiting on historical sync. But I exposed the findMany API to the Model/Entities. I always found that missing from subgraphs, so we'd have to store IDs and loop over them for some things.