{"id":"multi-leader-idempotent-apply","text":"Each `(key, timestamp, origin_node)` triple is applied at most once per node, tracked by the `_seen` set, preventing duplicate application in ring topologies where changes propagate through multiple hops","truth_value":"IN","source":"entries/2026/05/29/multi-leader-replication-multi_leader.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{"example":"if key in self._seen and (remote_ts, remote_node) in self._seen[key]:\n    return None  # already applied"},"explanation":{"steps":[{"node":"multi-leader-idempotent-apply","truth_value":"IN","reason":"premise"}]}}