The exchange search silently filtered by the in-memory agent registry's current instance IDs on top of application_id. Historical exchanges written by previous agent instances (or any instance not currently registered, e.g. after a server restart before agents heartbeat back) were hidden from results even though they matched the application filter. Fix: drop the applicationId -> instanceIds resolution in SearchController. Rely on application_id = ? in ClickHouseSearchIndex; keep explicit instanceIds filtering only when a client passes them. Related cleanup: the agentIds parameter on StatsStore.statsForRoute / timeseriesForRoute was silently discarded inside ClickHouseStatsStore, so per-route stats aggregated across any apps sharing a routeId. Replace with String applicationId and add application_id to the stats_1m_route filters so per-route stats are correctly scoped. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>