Arbitrum: Indexer lagging

[Tburm]

The Arbitrum mainnet indexer is lagging behind the block of the actual chain head. If left for long periods of time, the chain head on the indexer drifts from the chain. Restarting the docker service will "catch up" the indexer, which will again start lagging.

The reason for the lag is unknown, as using fast RPCs like Alchemy with higher rate limits don't seem to work.

Tasks:

• Find a solution to fix the indexer
• Investigate solutions for testing indexed events against other data sources (RPC, cryo, dune, etc.)

[Tburm]

Rate limits were set too low to index the chain, solved in #106