test: the stall-sweep tests read the thresholds they check, and stay clear of the new import value (#4432)

Run 7505 failed test_recover_stalled_task_runs_ml_queue_uses_longer_threshold.
It restated the old 25-minute ml threshold as a 30-minute "stale" row,
which is now inside the 40-minute window. The test now reads the value
from QUEUE_STUCK_THRESHOLD_MINUTES.

The archive test's fast-import row was exactly 10 minutes old, which is
the new import threshold, so it passed only by the milliseconds between
seeding and sweeping. It is now 15 minutes old.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR

tests/test_maintenance.py

@@ -335,26 +335,30 @@ def test_recover_stalled_task_runs_ml_queue_uses_longer_threshold(db_sync):
     """ml-queue tasks (embed_image video branch) legitimately run
     past the default 5-min threshold. The sweep must NOT flag an
     ml-queue task that's only been running 10 min — the override
-    threshold (25 min via QUEUE_STUCK_THRESHOLD_MINUTES) protects
-    in-flight video tagging. Operator-flagged 2026-05-28 after
-    image 6288 (mp4) was marked failed at the 5-min tick mid-run."""
+    threshold (QUEUE_STUCK_THRESHOLD_MINUTES["ml"]) protects in-flight
+    video tagging. Operator-flagged 2026-05-28 after image 6288 (mp4)
+    was marked failed at the 5-min tick mid-run. Read from the table
+    rather than restated: the value moved 25 -> 40 in #4432."""
     from sqlalchemy import select
 
     from backend.app.models import TaskRun
-    from backend.app.tasks.maintenance import recover_stalled_task_runs
+    from backend.app.tasks.maintenance import (
+        QUEUE_STUCK_THRESHOLD_MINUTES,
+        recover_stalled_task_runs,
+    )
 
+    ml_threshold = QUEUE_STUCK_THRESHOLD_MINUTES["ml"]
     now = datetime.now(UTC)
     # 10-min-old ml-queue row: stale by the default 5-min rule but
-    # fresh by the 25-min ml override. Must survive the sweep.
+    # fresh by the ml override. Must survive the sweep.
     ml_fresh_id = _make_task_run(
         db_sync, status="running", queue="ml",
         started_at=now - timedelta(minutes=10),
     )
-    # 30-min-old ml-queue row: past even the ml override. Must be
-    # flagged.
+    # Past even the ml override. Must be flagged.
     ml_stale_id = _make_task_run(
         db_sync, status="running", queue="ml",
-        started_at=now - timedelta(minutes=30),
+        started_at=now - timedelta(minutes=ml_threshold + 5),
     )
     db_sync.commit()
 
@@ -431,9 +435,10 @@ def test_download_stuck_threshold_exceeds_hard_time_limit():
 def test_recover_stalled_task_runs_archive_task_uses_longer_threshold(db_sync):
     """import_archive_file shares the 'import' queue with fast
     single-file import_media_file, so it gets a per-task-name override
-    (40 min) while the import queue stays at the 5-min default. A
-    10-min-old archive task-run must survive; a 50-min-old one is
-    flagged. Operator-flagged 2026-05-28."""
+    (40 min) while the import queue keeps its short threshold (10 min
+    since #4432; import_media_file's hard limit is 6). A 10-min-old
+    archive task-run must survive; a 50-min-old one is flagged.
+    Operator-flagged 2026-05-28."""
     from sqlalchemy import select
 
     from backend.app.models import TaskRun
@@ -441,12 +446,12 @@ def test_recover_stalled_task_runs_archive_task_uses_longer_threshold(db_sync):
 
     archive_name = "backend.app.tasks.import_file.import_archive_file"
     now = datetime.now(UTC)
-    # Fast single-file import on the same queue, 10 min old → flagged
-    # by the default 5-min rule.
+    # Fast single-file import on the same queue, 15 min old → flagged
+    # by the import queue's 10-min threshold.
     media_id = _make_task_run(
         db_sync, status="running", queue="import",
         task_name="backend.app.tasks.import_file.import_media_file",
-        started_at=now - timedelta(minutes=10),
+        started_at=now - timedelta(minutes=15),
     )
     # Archive on the same queue, 10 min old → survives (40-min override).
     archive_fresh_id = _make_task_run(