* fix(chat): surface and recover from undelivered assistant responses
When the background worker that runs AssistantResponseJob is down or not
polling the high_priority queue, the eager "pending" assistant message had no
safeguard: chat hung on "Thinking…" forever with no error, timeout, or retry,
and the LLM provider was never even called.
Add three layers of resilience:
- Client watchdog (chat_controller.js): a pending "Thinking…" bubble that waits
past a threshold (default 90s) with no response asks the server to fail it.
Keyed on the pending marker — which disappears the instant a real response
streams — so a slow-but-working response is never falsely timed out.
- Server failure capture (Chat#handle_undelivered_response! +
MessagesController#report_timeout): clears the dead bubble, records a friendly
"the assistant didn't respond" error with Retry, and writes a DebugLogEntry so
support can see it in /settings/debug.
- Worker liveness signal (BackgroundJobHealth + warning banner): reads Sidekiq's
process/queue state directly from Redis in the web process — so a down worker
is detectable even though the worker is the thing that's broken — and warns
self-hosted users when no worker polls high_priority or it's badly backed up.
Fails open so a Sidekiq/Redis blip never blocks chat.
Tests: Chat model (3), MessagesController (2), BackgroundJobHealth (5).
* fix(chat): address review — server-side timeout guard + watchdog retry safety
- Chat#handle_undelivered_response!: gate the state change behind a row lock and
a server-side minimum age (UNDELIVERED_RESPONSE_TIMEOUT = 60s). The browser
watchdog is untrusted, so re-read the row under lock and only fail a bubble
that is still pending AND has genuinely waited past the timeout — never racing
a worker that is finishing a slow response. (Codex P2 + CodeRabbit)
- chat_controller.js: only mark a report URL as reported on response.ok (fetch
resolves on HTTP 4xx/5xx, rejecting only on network errors), and guard
concurrent duplicate POSTs with an in-flight set, so a failed report retries
instead of stranding the bubble. (CodeRabbit)
- _worker_health_warning: drop the unused `chat:` local + its render arg. (CodeRabbit)
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