Operator: the buttons fire but the status view doesn't reflect the change. Cause:
act() ignored the POST's own status response and waited on the separate /status
poll (which lags behind the curator queue call). Now:
- act() applies the POST's returned status immediately for instant feedback, and
shows an optimistic "starting"/"stopping" state (pulsing, buttons disabled)
the moment it's clicked.
- A stop that still has in-flight jobs draining shows "stopping" until active
hits 0, then resolves to "stopped" on its own.
- applyStatus() guards the /status-only fields (connection pill + queue) so the
lean action response can't blank them — the Start/Stop path deliberately skips
the slow curator call to stay snappy.
Also de-duplicate GPU reads: read_gpu() now caches (1s TTL) with one probe at a
time, and /status no longer spawns its own nvidia-smi — so the fast /gpu poll +
autoscaler + /status share a single subprocess instead of piling up in the
server thread pool (which was what made clicks feel dead under load).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa
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