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>
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