Remove live-device UI labels and clean persistence acceptance jobs

scripts/persistence-check.py

@@ -29,12 +29,15 @@ def api(path, method="GET", payload=None):
         },
     )
     with urlopen(request, timeout=10) as response:
-        return json.loads(response.read())
+        body = response.read()
+        return json.loads(body) if body else None
 
 
 assert api("/api/v1/settings")["mock"] is True, "Persistence test requires Mock mode"
 record = Path("data/persistence-acceptance.json")
 if args.mode == "record":
+    if record.exists():
+        raise SystemExit("An acceptance record already exists; run check first")
     job = api(
         "/api/v1/jobs",
         "POST",
@@ -76,4 +79,6 @@ else:
     assert api("/api/v1/operations/" + saved["operation_id"])["status"] == "COMPLETED"
     assert any(a["asset_id"] == saved["asset_id"] for a in api("/api/v1/assets"))
     assert api("/ready")["status"] == "ready"
-    print("Restart persistence: 4 checks passed (job/operation/asset/readiness)")
+    api("/api/v1/jobs/" + saved["job_id"], "DELETE")
+    record.unlink()
+    print("Restart persistence: 4 checks passed; acceptance job removed")