fix: task runs record the lane Celery really routes them to, and no healthy long job is swept as stalled (#4432)

celery_signals._queue_for was a hand-kept copy of task_routes and had
drifted:

- backup, admin and library_audit jobs, and backfill_phash, run on
  maintenance_long but were recorded as `maintenance`;
- translation and gpu_queue jobs were recorded as `default`, where the
  5-minute stall sweep failed healthy 35-minute translation runs.

It now asks the router, cached per task name.

A new guard test checks every registered task's hard time limit against
the stall threshold the sweep would use for it. It also caught these
sweeps, which failed healthy runs mid-flight and are fixed here:

- ml's scheduled sweeps (35 min, previously swept at 25);
- train_heads and apply_head_tags (65 min);
- import_media_file (6 min, previously swept at 5);
- the long lane, which now has its own 45-minute threshold.

UI changes:

- the admin job poller follows a job by celery_task_id, via a new filter
  on /runs, instead of by lane;
- the archive re-extract and missing-file repair cards show the long
  lane's backlog, where their jobs actually wait;
- the queue table lists maintenance_long.

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

frontend/src/components/settings/ArchiveReextractCard.vue

@@ -17,7 +17,7 @@
         <v-icon start>mdi-folder-zip-outline</v-icon> Re-extract archives now
       </v-btn>
       <span v-if="queued" class="ml-3 text-caption text-success">Queued ✓</span>
-      <QueueStatusBar queue="maintenance" queue-label="Maintenance" />
+      <QueueStatusBar queue="maintenance_long" queue-label="Long maintenance" />
   </MaintenanceTile>
 </template>
 

frontend/src/components/settings/MissingFileRepairCard.vue

@@ -18,7 +18,7 @@
         <v-icon start>mdi-file-remove-outline</v-icon> Repair missing-file records
       </v-btn>
       <span v-if="queued" class="ml-3 text-caption text-success">Queued ✓</span>
-      <QueueStatusBar queue="maintenance" queue-label="Maintenance" />
+      <QueueStatusBar queue="maintenance_long" queue-label="Long maintenance" />
   </MaintenanceTile>
 </template>
 

frontend/src/components/settings/QueuesTable.vue

@@ -41,7 +41,7 @@ const props = defineProps({
 
 const QUEUE_NAMES = [
   'default', 'import', 'thumbnail', 'ml',
-  'download', 'scan', 'maintenance',
+  'download', 'scan', 'maintenance', 'maintenance_long',
 ]
 
 function formatDepth(name) {

frontend/src/stores/admin.js

@@ -119,7 +119,7 @@ export const useAdminStore = defineStore('admin', () => {
   // --- Task progress polling (taps FC-3i activity dashboard) --------
 
   /**
-   * Polls /api/system/activity/runs?queue=maintenance every 3s,
+   * Polls /api/system/activity/runs?celery_task_id=<id> every 3s,
    * resolves when a task_run row with the given celery task_id
    * reaches a terminal status (ok / error / timeout). Returns the
    * row. Times out after 30 min by default.
@@ -129,7 +129,9 @@ export const useAdminStore = defineStore('admin', () => {
     while (Date.now() < deadline) {
       const body = await api.get(
         '/api/system/activity/runs',
-        { params: { queue: 'maintenance', limit: 20 } },
+        // By id, not by lane: these jobs run on `maintenance_long`, and a
+        // lane filter here is one more copy of the routing table (#4432).
+        { params: { celery_task_id: taskId, limit: 1 } },
       )
       const row = (body.runs || []).find(r => r.celery_task_id === taskId)
       if (row && ['ok', 'error', 'timeout'].includes(row.status)) {