Great to see that we can basically rip this out. However I think I see at least one regression: The Leader no longer checks for replays in time to reject the reports during an aggregation job.

Also, and this is somewhat separate so feel free to punt: The ReportsProcessed DO instances are self-cleaning in the sense that, on creation, an alarm is set that deletes the instance some time later. Now would be a good time to implement this for AggregateStore as well, since we mainly just need to copy-paste the code from the reports_processed module to aggregate_store.

Looking good! One more question about the code itself, other comments are just related to documentation.

Looks great overall, but I think this needs a few minor changes. I've also bumped some comments that we missed in the previous round.

Also, I think we should delete this outdated comment we noticed on Tuesday (this caused some confusion about if/when the Leader needs to check for replays): https://github.com/cloudflare/daphne/blob/main/daphne_worker/src/roles/leader.rs#L105-L109

🦆 great work