For multiple clients connecting to a live feed (e.g. the client portal):
- cache the last broadcast frame and replay it to a new subscriber on
connect, so a client sees data immediately instead of waiting a full
poll cycle.
- broadcast a {"feed_status":"unreachable"} frame once on transition (after
3 consecutive poll failures) so clients can render an offline state
instead of a frozen chart; data frames now carry "feed_status":"ok".
The cached frame reflects current state, so a client connecting while
offline gets "unreachable" right away too.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
serversdown
6b1ec75396