[loop-cycle-50] refactor: replace bare sqlite3.connect() with context managers batch 2 (#157) (#180)

src/dashboard/routes/system.py

@@ -209,14 +209,11 @@ async def api_swarm_status():
 
     pending_tasks = 0
     try:
-        db = _get_db()
-        try:
+        with _get_db() as db:
             row = db.execute(
                 "SELECT COUNT(*) as cnt FROM tasks WHERE status IN ('pending_approval','approved')"
             ).fetchone()
             pending_tasks = row["cnt"] if row else 0
-        finally:
-            db.close()
     except Exception:
         pass