feat(ws): add connection status and last updated time

backend/data.json

@@ -1,62 +1,62 @@
 [
   {
-    "number": 43,
-    "timestamp": 1751904678378
-  },
-  {
-    "number": 44,
-    "timestamp": 1751904688400
-  },
-  {
-    "number": 50,
-    "timestamp": 1751904698413
-  },
-  {
-    "number": 55,
-    "timestamp": 1751904708422
-  },
-  {
-    "number": 52,
-    "timestamp": 1751904718446
-  },
-  {
-    "number": 45,
-    "timestamp": 1751904728342
-  },
-  {
-    "number": 73,
-    "timestamp": 1751904738349
-  },
-  {
-    "number": 45,
-    "timestamp": 1751904748375
-  },
-  {
-    "number": 45,
-    "timestamp": 1751904758402
-  },
-  {
-    "number": 49,
-    "timestamp": 1751904768420
-  },
-  {
-    "number": 71,
-    "timestamp": 1751904778446
-  },
-  {
-    "number": 62,
-    "timestamp": 1751904788455
-  },
-  {
-    "number": 46,
-    "timestamp": 1751904798494
-  },
-  {
-    "number": 46,
-    "timestamp": 1751904808488
+    "number": 76,
+    "timestamp": 1751906592502
   },
   {
     "number": 63,
-    "timestamp": 1751904818496
+    "timestamp": 1751906602503
+  },
+  {
+    "number": 87,
+    "timestamp": 1751906612523
+  },
+  {
+    "number": 68,
+    "timestamp": 1751906622542
+  },
+  {
+    "number": 55,
+    "timestamp": 1751906632552
+  },
+  {
+    "number": 57,
+    "timestamp": 1751906642555
+  },
+  {
+    "number": 69,
+    "timestamp": 1751906652569
+  },
+  {
+    "number": 78,
+    "timestamp": 1751906662576
+  },
+  {
+    "number": 78,
+    "timestamp": 1751906672595
+  },
+  {
+    "number": 58,
+    "timestamp": 1751906682619
+  },
+  {
+    "number": 91,
+    "timestamp": 1751906692626
+  },
+  {
+    "number": 76,
+    "timestamp": 1751906702646
+  },
+  {
+    "number": 64,
+    "timestamp": 1751906712664
+  },
+  {
+    "number": 70,
+    "timestamp": 1751906722670
+  },
+  {
+    "number": 68,
+    "timestamp": 1751906732689
   }
 ]