fix: a crashed job's crash line carries its job id

The bind sat inside the try, so it was already reset when the crash line and the cleanup were logged — the one line most worth finding by job id had none.

backend/app/worker.py

@@ -493,14 +493,16 @@ def _worker_loop(idx: int) -> None:
         if job_id is None:
             _stop.wait(settings.download_poll_seconds)
             continue
-        try:
-            # Tag every line this job produces (including the crash below) with the job id: a worker
-            # runs N jobs at once on N threads, so without it the interleaved output is unreadable.
-            with logs.bind(job_id=job_id):
+        # Tag every line this job produces (including the crash below) with the job id: a worker runs
+        # N jobs at once on N threads, so without it the interleaved output is unreadable. The bind
+        # wraps the handler too — bound inside the `try`, it was already reset by the time the crash
+        # line was logged.
+        with logs.bind(job_id=job_id):
+            try:
                 _process_job(job_id)
-        except Exception:  # noqa: BLE001
-            log.exception("processing job %s crashed", job_id)
-            _fail_running(job_id, error="Worker error", error_code=None)
+            except Exception:  # noqa: BLE001
+                log.exception("processing job %s crashed", job_id)
+                _fail_running(job_id, error="Worker error", error_code=None)
 
 
 def main() -> None:

backend/tests/test_worker_supervisor.py

@@ -236,3 +236,37 @@ def test_stop_child_noop_if_already_exited(killpg_rec):
     proc.returncode = 0  # already gone
     worker._stop_child(proc, grace_s=0.01)
     assert killpg_rec == []
+
+
+def test_a_crashed_jobs_crash_line_and_cleanup_carry_the_job_id(monkeypatch):
+    """The job id is bound for the WHOLE job, the crash handler included: bound inside the `try`, it
+    was already reset when the one line that says the job crashed was logged."""
+    from app import logs
+
+    seen: dict[str, object] = {}
+    claims = iter([42])
+
+    def claim():
+        job = next(claims, None)
+        if job is None:
+            worker._stop.set()
+        return job
+
+    def crash(_job_id):
+        raise RuntimeError("boom")
+
+    monkeypatch.setattr(worker, "_claim_job", claim)
+    monkeypatch.setattr(worker, "_process_job", crash)
+    monkeypatch.setattr(
+        worker.log, "exception", lambda *a, **k: seen.setdefault("crash", logs._job_id.get())
+    )
+    monkeypatch.setattr(
+        worker, "_fail_running", lambda *a, **k: seen.setdefault("cleanup", logs._job_id.get())
+    )
+    monkeypatch.setattr(worker.settings, "download_poll_seconds", 0)
+    worker._stop.clear()
+    try:
+        worker._worker_loop(0)
+    finally:
+        worker._stop.clear()
+    assert seen == {"crash": 42, "cleanup": 42}