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Issue Addressed
#7603
Proposed Changes
Introduce a new custody backfill syncing service. An mpsc channel is introduced so that lighthouse services can communicate with sync to trigger custody backfill when CGC changes.
Additional Notes
We could try fitting in custody backfill functionality into our current backfill service, but I think this adds complexity to the backfill service and could introduce bugs/edge cases we really don't want to deal with. It feels like a separate custody backfill service is easier to maintain and allows for a nice separation of concerns. Happy to be proven otherwise