- Coalescing queue: use HasPendingTaskForIssue (queued/dispatched only)
instead of HasActiveTaskForIssue so comments during a running task
enqueue exactly one follow-up task that picks up all new comments.
- Stale task cleanup: runtime sweeper now fails orphaned tasks when
their runtime goes offline (daemon crash/network partition).
- Cancel-aware daemon: handleTask checks task status after execution
and discards results if the task was cancelled mid-run (e.g. reassign).
- Terminal issue guard: ClaimTaskForRuntime auto-cancels pending tasks
for done/cancelled issues instead of executing them.
- Race condition safety net: unique partial index ensures at most one
pending task per issue at the DB level.
The only path to marking a runtime offline was the daemon's deregister
call on graceful shutdown. If the daemon crashed, was killed, or lost
network, the status stayed "online" forever. Add a background goroutine
that sweeps every 30s and marks runtimes offline after 45s without a
heartbeat (3 missed intervals).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
