{"id":"seen-set-keyed-by-ts-origin","text":"`_seen` maps each key to a set of `(timestamp, origin_node_id)` tuples; a change is skipped if its exact `(ts, origin)` pair is already in the set for that key","truth_value":"IN","source":"entries/2026/05/29/topic-ring-topology-propagation.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"seen-set-keyed-by-ts-origin","truth_value":"IN","reason":"premise"}]}}