Codex deep-gate caught a CORE regression in the original top-N cap: capping
_apply_sidebar_state_db_overrides also capped the SOURCE classification that
/api/sessions filters on BEFORE the lazy lineage correction, so a stale-CLI JSON
row whose state.db source is webui could be silently filtered out of a WebUI-only
sidebar once it fell beyond the cap. Split the read: the indexed sessions-table
source/title lookup runs for ALL rows; only the expensive messages COUNT/MAX
aggregation (the actual 5-18s bottleneck) is capped to top-N. Added a 500-row
end-to-end regression with a real state.db proving the beyond-cap stale-CLI row
stays webui.
nesquena-hermes
c344844766