At launch nothing is in memory yet, so the badge showed offline even with a
recent QSO. liveLastQSOTime is now authoritative: it takes the most recent of
the in-memory stamp AND the DB (this operator's last QSO — covers a contact
from the shared logbook or one logged before launch), used by both the
published status and the badge. The badge polls the backend every 5 s (down
from 15) and on each qso:logged, so it shows on air within a few seconds and
flips online instantly on a new contact.
The multi-op live status heartbeated every 15 s, so an operator who left the
log open but stopped working still showed on air. Now it publishes an explicit
online flag: online when a new contact was logged within the last 5 minutes,
offline otherwise. live_status gains `online` + `last_qso_at` columns (added to
existing tables via ALTER). Logging a QSO (manual, UDP, ADIF monitor) stamps the
time and republishes at once, so they flip back online instantly.
At launch the last-QSO time is seeded from the DB (Repo.LastQSOTime), so an
operator who worked someone just before starting OpsLog is shown online right
away rather than offline until their next contact. LiveLastQSOAgeSec exposes it
to the UI badge.