- Previous setup would fail if there were no headers in the db. This
makes sense because we need headers that haven't been checked for
logs to exist so that we can fetch logs for those headers. But it
also prevents us from kicking off the headerSync and contractWatcher
processes concurrently. These changes enable kicking off both
processes at the same time with the idea that we will have unchecked
headers upon transformer execution.
- Focus on header mode
- Add context to errors, trace guard clauses, warn on non-returned
errors
- Give errors distinct names so compiler will recognize if unchecked
- Remove redundant type declarations/fix typos
