Routes with zero executions (sub-routes) vanish from the sidebar after
server restart because the catalog is purely in-memory with a ClickHouse
stats fallback that only covers executed routes. This spec describes a
persistent route_catalog table in ClickHouse with lifecycle tracking
(first_seen/last_seen) to reconstruct the sidebar without agent
reconnection and support historical time-window queries.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
