Group webhook deliveries by identity within a time window and decide: process, dedupe, retry, reconc

Overview

Given previously seen deliveries (identity, receivedAt, payload or digest, handling outcome) and a new incoming one, finds earlier deliveries with the same identity inside the window and returns process (none), dedupe (same payload already processed), retry (earlier ones all failed), reconcile (an earlier one is in flight or unknown, or the same identity arrives with a different payload) or abstain (times or payload evidence missing, or the only history for this identity is d

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