fix(integration): lazy seed-snapshot (unblock unit job); isolate recover test from eager import

tests/test_maintenance.py

@@ -26,7 +26,7 @@ def _make_batch(session) -> int:
     return batch.id
 
 
-def test_recover_interrupted_only_old(db_sync):
+def test_recover_interrupted_only_old(db_sync, monkeypatch):
     batch_id = _make_batch(db_sync)
     now = datetime.now(UTC)
 
@@ -41,6 +41,16 @@ def test_recover_interrupted_only_old(db_sync):
     db_sync.add_all([fresh, stale])
     db_sync.commit()
 
+    # Isolate the recover task: under eager Celery, the real
+    # import_media_file.delay() would run inline against the nonexistent
+    # /import/b.jpg and flip the just-requeued row 'queued' -> 'skipped'.
+    from backend.app.tasks import import_file
+
+    dispatched: list[int] = []
+    monkeypatch.setattr(
+        import_file.import_media_file, "delay", dispatched.append
+    )
+
     from backend.app.tasks.maintenance import recover_interrupted_tasks
     recovered = recover_interrupted_tasks.apply().get()
     assert recovered == 1
@@ -50,6 +60,7 @@ def test_recover_interrupted_only_old(db_sync):
     assert fresh.status == "processing"
     assert stale.status == "queued"
     assert stale.started_at is None
+    assert dispatched == [stale.id]
 
 
 def test_cleanup_old_deletes_finished_old(db_sync):