Improve SQLite batching and diagnostics visibility

backend/app/services/diagnostics.py

@@ -16,7 +16,7 @@ from ..clients.qbittorrent import QBittorrentClient
 from ..clients.radarr import RadarrClient
 from ..clients.sonarr import SonarrClient
 from ..config import settings as env_settings
-from ..db import run_integrity_check
+from ..db import get_database_diagnostics
 from ..runtime import get_runtime_settings
 from .invite_email import send_test_email, smtp_email_config_ready, smtp_email_delivery_warning
 
@@ -205,12 +205,16 @@ async def _run_http_post(
 
 
 async def _run_database_check() -> Dict[str, Any]:
-    integrity = await asyncio.to_thread(run_integrity_check)
+    detail = await asyncio.to_thread(get_database_diagnostics)
+    integrity = _clean_text(detail.get("integrity_check"), "unknown")
+    requests_cached = detail.get("row_counts", {}).get("requests_cache", 0) if isinstance(detail, dict) else 0
+    wal_size_bytes = detail.get("wal_size_bytes", 0) if isinstance(detail, dict) else 0
+    wal_size_megabytes = round((float(wal_size_bytes or 0) / (1024 * 1024)), 2)
     status = "up" if integrity == "ok" else "degraded"
     return {
         "status": status,
-        "message": f"SQLite integrity_check returned {integrity}",
-        "detail": integrity,
+        "message": f"SQLite {integrity} · {requests_cached} cached requests · WAL {wal_size_megabytes:.2f} MB",
+        "detail": detail,
     }