cleanup redundant code

ui/src/services/store.ts

@@ -10,3 +10,17 @@ export function getLastMessage(): StatusMessage | null {
 export function setLastMessage(message: StatusMessage) {
     store.set(message);
 }
+
+const realtimeData: StatusMessage[] = [];
+const maxRealtimePoints = 50;
+
+export function addDataPoint(value: StatusMessage) {
+    realtimeData.push(value);
+
+    if (realtimeData.length > maxRealtimePoints) {
+        realtimeData.shift();
+    }
+}
+export function getRealtimeData(): StatusMessage[] {
+    return realtimeData ?? [];
+}