Add some tests, make it an actual endpoint (whoops said we didn't need that) and tidy things up a bit

frontend/src/components/RepeaterDashboard.tsx

@@ -1,5 +1,6 @@
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 
+import { api } from '../api';
 import { toast } from './ui/sonner';
 import { Button } from './ui/button';
 import { Bell, Info, Route, Star, Trash2 } from 'lucide-react';
@@ -12,7 +13,13 @@ import { isFavorite } from '../utils/favorites';
 import { handleKeyboardActivate } from '../utils/a11y';
 import { isValidLocation } from '../utils/pathUtils';
 import { ContactStatusInfo } from './ContactStatusInfo';
-import type { Contact, Conversation, Favorite, PathDiscoveryResponse } from '../types';
+import type {
+  Contact,
+  Conversation,
+  Favorite,
+  PathDiscoveryResponse,
+  TelemetryHistoryEntry,
+} from '../types';
 import { cn } from '../lib/utils';
 import { TelemetryPane } from './repeater/RepeaterTelemetryPane';
 import { NeighborsPane } from './repeater/RepeaterNeighborsPane';
@@ -91,6 +98,24 @@ export function RepeaterDashboard({
   const { password, setPassword, rememberPassword, setRememberPassword, persistAfterLogin } =
     useRememberedServerPassword('repeater', conversation.id);
 
+  // Telemetry history: preload from stored data, refresh from live status
+  const [telemetryHistory, setTelemetryHistory] = useState<TelemetryHistoryEntry[]>([]);
+  useEffect(() => {
+    if (!loggedIn) return;
+    api
+      .repeaterTelemetryHistory(conversation.id)
+      .then(setTelemetryHistory)
+      .catch(() => {});
+  }, [loggedIn, conversation.id]);
+
+  // When a live status fetch returns embedded telemetry_history, replace local state
+  useEffect(() => {
+    const liveHistory = paneData.status?.telemetry_history;
+    if (liveHistory && liveHistory.length > 0) {
+      setTelemetryHistory(liveHistory);
+    }
+  }, [paneData.status?.telemetry_history]);
+
   const isFav = isFavorite(favorites, 'contact', conversation.id);
 
   const handleRepeaterLogin = async (nextPassword: string) => {
@@ -357,10 +382,7 @@ export function RepeaterDashboard({
             />
 
             {/* Telemetry history chart — full width, below console */}
-            <TelemetryHistoryPane
-              entries={paneData.status?.telemetry_history ?? []}
-              statusFetchedAt={paneStates.status.fetched_at}
-            />
+            <TelemetryHistoryPane entries={telemetryHistory} />
           </div>
         )}
       </div>

frontend/src/components/repeater/RepeaterTelemetryHistoryPane.tsx

@@ -47,16 +47,8 @@ function formatUptime(seconds: number): string {
   return `${(seconds / 86400).toFixed(1)}d`;
 }
 
-export function TelemetryHistoryPane({
-  entries,
-  statusFetchedAt,
-}: {
-  entries: TelemetryHistoryEntry[];
-  statusFetchedAt?: number | null;
-}) {
+export function TelemetryHistoryPane({ entries }: { entries: TelemetryHistoryEntry[] }) {
   const [metric, setMetric] = useState<Metric>('battery_volts');
-  // statusFetchedAt is used to indicate freshness; suppress unused lint
-  void statusFetchedAt;
 
   const config = METRIC_CONFIG[metric];