fix(audit-g4): status-enum miss batch

Five extension-miss findings from the 2026-06-02 audit, where a status
value was added on one side but a downstream consumer didn't pick it up.

- download_service._phase3_persist: explicit branches for
  ImportResult.status in ('failed','refreshed'). For 'failed' (archive
  probe crash from _import_archive), unlink the source file so the
  filesystem scanner doesn't re-import and re-crash on the same
  archive forever. 'refreshed' is currently unreachable from the
  download path (no deep=True) but matches the importer's documented
  contract; treat as 'attached'.

- gallery-dl backfill auto-complete now gates on dl_result.success +
  no error_type, not just return_code==0 + files_downloaded==0.
  VALIDATION_FAILED exits the subprocess with returncode=0 and
  files_downloaded=0 when every file was quarantined, matching the
  prior predicate exactly and zeroing the operator's armed backfill
  budget on the FIRST quarantine run instead of decrementing.

- attach_in_place archive dispatch now threads artist + source_row
  through _import_archive (and _import_media for archive members)
  and _supersede. The path-walk fallback (_resolve_artist) is still
  used by filesystem-import; the download path now binds
  ImageProvenance to the explicit subscription Source instead of
  rediscovering by (artist_id, platform).

- Three FE handlers now recognize status:'deferred' from
  /api/sources/<id>/check: SubscriptionsTab.onCheck (was toasting
  "event #undefined"), SubscriptionsTab.checkAll (was counting
  deferred as queued), DownloadEventRow.onRetry (was saying
  "re-queued" when nothing was). Pattern matches DownloadsTab.onRetryAll
  which already had it.

- celery_signals._queue_for now maps backup/admin/library_audit
  prefixes to 'maintenance' (matching task_routes). TaskRun.queue
  was returning 'default' for those rows, so per-queue dashboard
  filters and per-queue threshold overrides (added in G3) silently
  missed them.

backend/app/celery_signals.py

@@ -54,7 +54,14 @@ _INT32_MIN = -2_147_483_648
 
 def _queue_for(task) -> str:
     """Reverse the task→queue routing from celery_app.task_routes.
-    Keep in sync if task_routes is reordered."""
+    Keep in sync if task_routes is reordered.
+
+    Audit 2026-06-02: backup/admin/library_audit prefixes were
+    missing here even though task_routes sent all three to
+    'maintenance'. The TaskRun.queue column then lied for those
+    rows (claimed 'default') so per-queue dashboard filters and
+    per-queue threshold overrides silently missed them.
+    """
     name = getattr(task, "name", "") or ""
     if name.startswith("backend.app.tasks.import_file."):
         return "import"
@@ -66,7 +73,12 @@ def _queue_for(task) -> str:
         return "download"
     if name.startswith("backend.app.tasks.scan."):
         return "scan"
-    if name.startswith("backend.app.tasks.maintenance."):
+    if name.startswith((
+        "backend.app.tasks.maintenance.",
+        "backend.app.tasks.backup.",
+        "backend.app.tasks.admin.",
+        "backend.app.tasks.library_audit.",
+    )):
         return "maintenance"
     return "default"
 

backend/app/services/download_service.py

@@ -315,6 +315,23 @@ class DownloadService:
                 # failure. Don't flag the run as error; the file stays
                 # on disk for operator inspection.
                 import_summary["skipped"] += 1
+            elif result.status == "failed":
+                # Hard failure (today only: archive probe crash/timeout).
+                # The original archive sits in /images/ as an orphan; the
+                # filesystem scanner would re-import and re-crash on the
+                # same file, so delete the source file and surface the
+                # error in import_summary. Audit 2026-06-02.
+                import_summary["errors"] += 1
+                try:
+                    path.unlink(missing_ok=True)  # noqa: ASYNC240
+                except OSError:
+                    pass
+            elif result.status == "refreshed":
+                # Currently unreachable from attach_in_place (the download
+                # path never runs in deep=True mode), but the importer's
+                # ImportResult contract enumerates it. Treat the same as
+                # 'attached' — work happened, no error. Audit 2026-06-02.
+                import_summary["attached"] += 1
             else:
                 import_summary["errors"] += 1
 
@@ -361,12 +378,26 @@ class DownloadService:
         # backfill run drained the queue (gallery-dl exited 0 + zero files
         # downloaded means there was nothing to fetch); otherwise decrement
         # the counter. Next tick falls back to tick mode once it hits 0.
+        #
+        # Audit 2026-06-02 gating: VALIDATION_FAILED also exits the
+        # subprocess with return_code=0 and files_downloaded=0 (every
+        # file was quarantined), which used to match the auto-complete
+        # predicate exactly — zeroing the operator's armed budget on
+        # the FIRST quarantine run instead of decrementing. Require
+        # dl_result.success + no error_type so only genuinely-empty
+        # successful runs drain the counter.
         backfill_remaining = ctx.get("backfill_runs_remaining", 0) or 0
         if backfill_remaining > 0:
             src = (await self.async_session.execute(
                 select(Source).where(Source.id == ctx["source_id"])
             )).scalar_one()
-            if dl_result.return_code == 0 and dl_result.files_downloaded == 0:
+            queue_drained = (
+                dl_result.success
+                and dl_result.error_type is None
+                and dl_result.return_code == 0
+                and dl_result.files_downloaded == 0
+            )
+            if queue_drained:
                 src.backfill_runs_remaining = 0
             else:
                 src.backfill_runs_remaining = max(0, backfill_remaining - 1)

backend/app/services/importer.py

@@ -393,7 +393,11 @@ class Importer:
         self.session.commit()
         return ImportResult(status="attached")
 
-    def _import_archive(self, source: Path) -> ImportResult:
+    def _import_archive(
+        self, source: Path, *,
+        artist: Artist | None = None,
+        source_row: Source | None = None,
+    ) -> ImportResult:
         # Layer-3 isolation: bomb-size guard + integrity test in a
         # spawned child BEFORE extracting in this process. A
         # decompression bomb or a native-lib crash on a malformed
@@ -401,6 +405,14 @@ class Importer:
         # instead of OOMing/segfaulting the import worker. extract_archive
         # is already fail-soft for plain exceptions, so this only adds
         # the hard-crash protection.
+        #
+        # Audit 2026-06-02: optional artist/source_row kwargs let the
+        # download path thread its explicit subscription context
+        # through instead of having _resolve_artist re-derive from
+        # path-walk (which works by coincidence today because gallery-dl
+        # lays files out under /images/<artist_slug>/...). Filesystem
+        # import still calls bare _import_archive(source) and falls
+        # back to the path-walk derivation as before.
         probe = safe_probe.probe_archive(source)
         if not probe.ok:
             if probe.crashed:
@@ -412,24 +424,28 @@ class Importer:
             # still preserve the archive file itself as an attachment so
             # nothing silently vanishes, matching extract_archive's
             # fail-soft contract.
-            artist = self._resolve_artist(source)
-            post = self._post_for_sidecar(source, artist)
-            self._capture_attachment(source, post=post, artist=artist, resolved=True)
+            artist_use = artist if artist is not None else self._resolve_artist(source)
+            post = self._post_for_sidecar(source, artist_use)
+            self._capture_attachment(
+                source, post=post, artist=artist_use, resolved=True,
+            )
             return ImportResult(status="attached")
 
-        artist = self._resolve_artist(source)
-        post = self._post_for_sidecar(source, artist)
+        artist_use = artist if artist is not None else self._resolve_artist(source)
+        post = self._post_for_sidecar(source, artist_use)
         member_ids: list[int] = []
         with extract_archive(source) as members:
             for _name, member_path in members:
                 if not is_supported(member_path):
                     continue  # non-media preserved via the stored archive
-                res = self._import_media(member_path, source)
+                res = self._import_media(
+                    member_path, source, explicit_source=source_row,
+                )
                 if res.status in ("imported", "superseded") and res.image_id:
                     member_ids.append(res.image_id)
         # Preserve the archive itself (links to the same Post/Artist).
         self._capture_attachment(
-            source, post=post, artist=artist, resolved=True
+            source, post=post, artist=artist_use, resolved=True
         )
         if member_ids:
             return ImportResult(
@@ -439,7 +455,8 @@ class Importer:
         return ImportResult(status="attached")
 
     def _import_media(
-        self, source: Path, attribution_path: Path
+        self, source: Path, attribution_path: Path,
+        *, explicit_source: Source | None = None,
     ) -> ImportResult:
         """The media import pipeline (filters, dedup, copy, provenance).
 
@@ -586,7 +603,15 @@ class Importer:
             artist = self._attach_artist(record, artist_name)
 
         # Sidecar provenance (best-effort; never fails the import).
-        self._apply_sidecar(record, attribution_path, artist)
+        # explicit_source lets the FC-3c download path bind the new
+        # ImageProvenance row to its subscription Source instead of
+        # having _apply_sidecar re-derive via _lookup_source_for_sidecar.
+        # Audit 2026-06-02 — archive members extracted from a
+        # subscription-downloaded zip previously lost subscription
+        # linkage if the on-disk layout didn't match assumptions.
+        self._apply_sidecar(
+            record, attribution_path, artist, explicit_source=explicit_source,
+        )
 
         # Thumbnail is queued separately by the calling task; the importer
         # does not generate thumbnails inline so the import queue stays moving.
@@ -673,7 +698,9 @@ class Importer:
                 error="sidecar json is metadata, not content",
             )
         if is_archive(path):
-            return self._import_archive(path)
+            return self._import_archive(
+                path, artist=artist, source_row=source,
+            )
         if not is_supported(path):
             post = self._post_for_sidecar(path, artist) if artist else None
             return self._capture_attachment(
@@ -749,7 +776,8 @@ class Importer:
                 if rel == "smaller_exists":
                     target = self.session.get(ImageRecord, match_id)
                     self._supersede(
-                        target, path, sha, phash, width, height, new_path=path
+                        target, path, sha, phash, width, height,
+                        new_path=path, artist=artist, source_row=source,
                     )
                     return ImportResult(status="superseded", image_id=match_id)
 
@@ -944,6 +972,8 @@ class Importer:
         self, existing: ImageRecord, source: Path, sha: str,
         phash: str, width: int | None, height: int | None,
         *, new_path: Path | None = None,
+        artist: Artist | None = None,
+        source_row: Source | None = None,
     ) -> None:
         """Replace `existing`'s file with the larger `source`, keeping the
         row id (so tags/series/curation stay attached). ML is cleared so
@@ -995,8 +1025,14 @@ class Importer:
         # _apply_sidecar resolves artist from the sidecar itself if the
         # existing row has none, and is internally guarded against
         # missing-or-malformed sidecars (silent return).
+        # Audit 2026-06-02: thread artist/source_row from the
+        # download-path caller (attach_in_place smaller_exists branch)
+        # so the supersede preserves explicit subscription linkage
+        # instead of re-deriving via path-walk.
         try:
-            self._apply_sidecar(existing, source, None)
+            self._apply_sidecar(
+                existing, source, artist, explicit_source=source_row,
+            )
         except Exception as exc:
             # Don't unwind the supersede DB swap if sidecar parsing
             # blows up unexpectedly — the file replacement is the

frontend/src/components/downloads/DownloadEventRow.vue

@@ -124,10 +124,16 @@ async function onRetry() {
   if (!props.event.source_id) return
   retrying.value = true
   try {
-    await sourcesStore.checkNow(props.event.source_id)
-    toast({
-      text: `Source check re-queued`, type: 'success',
-    })
+    const body = await sourcesStore.checkNow(props.event.source_id)
+    // Audit 2026-06-02: the previous handler unconditionally toasted
+    // "re-queued" even when the platform was in cooldown (202 +
+    // status='deferred'). Operator thought work was in flight when
+    // nothing was actually enqueued.
+    if (body?.status === 'deferred') {
+      toast({ text: 'Retry deferred — platform in cooldown', type: 'info' })
+    } else {
+      toast({ text: 'Source check re-queued', type: 'success' })
+    }
   } catch (e) {
     const isInFlight = !!e?.body?.download_event_id
     toast({

frontend/src/components/subscriptions/SubscriptionsTab.vue

@@ -412,6 +412,17 @@ function onArtistCreated(artist) {
 async function onCheck(source) {
   try {
     const body = await store.checkNow(source.id)
+    // Audit 2026-06-02: /api/sources/<id>/check returns 202 with
+    // `{status:'deferred', cooldown_until}` when the platform is in
+    // cooldown — the previous handler treated this as success and
+    // toasted "event #undefined", masking that nothing was enqueued.
+    if (body?.status === 'deferred') {
+      toast({
+        text: 'Check deferred — platform in cooldown',
+        type: 'info',
+      })
+      return
+    }
     toast({
       text: `Check enqueued (event #${body.download_event_id})`,
       type: 'success',
@@ -465,17 +476,23 @@ async function onBackfill(source) {
 async function checkAll(group) {
   let ok = 0
   let conflict = 0
+  let deferred = 0
   for (const s of group.sources) {
     if (!s.enabled) continue
     try {
-      await store.checkNow(s.id)
-      ok += 1
+      const body = await store.checkNow(s.id)
+      // Audit 2026-06-02: deferred (202 + cooldown_until) used to be
+      // counted as queued, inflating the success tally and hiding
+      // that the cooldown actually held the work back.
+      if (body?.status === 'deferred') deferred += 1
+      else ok += 1
     } catch (e) {
       if (e?.body?.download_event_id) conflict += 1
     }
   }
   const parts = []
   if (ok) parts.push(`${ok} queued`)
+  if (deferred) parts.push(`${deferred} deferred (cooldown)`)
   if (conflict) parts.push(`${conflict} already running`)
   toast({
     text: parts.join(', ') || 'Nothing to check (no enabled sources)',