perf(sources): Quellen-Health Tab schneller (Payload-Slim + 60s-Cache)

Tab "Quellen Health" lädt deutlich schneller:

1. /api/sources/health: SELECT reduziert auf nur die im Frontend wirklich
   gerenderten Felder. Weg sind: h.id, s.url, s.source_type, s.category,
   s.bias, h.details, h.checked_at. Response-Größe sinkt damit von ~198 KB
   auf grob die Hälfte (bei 519 Health-Checks) ohne UI-Verlust.

2. source-health.js: 60-Sekunden In-Memory-Cache fürs loadHealthData.
   Tab hin und her klicken ist damit instant statt jedes Mal voller
   Reload + Render der 519 Tabellen-Zeilen.
   Bei Mutationen (Vorschlag annehmen/ablehnen, run-stream beendet,
   search-fix) wird mit loadHealthData(true) der Cache umgangen,
   damit frische Daten gezeigt werden.

3. dashboard.html: Cache-Buster für source-health.js auf 20260509e gebumpt.

src/routers/sources.py

@@ -578,10 +578,9 @@ async def get_health(
 
     cursor = await db.execute("""
         SELECT
-            h.id, h.source_id, s.name, s.domain, s.url, s.source_type,
-            s.tenant_id, s.category, s.language, s.bias,
+            h.source_id, s.name, s.domain, s.tenant_id, s.language,
             o.name AS org_name,
-            h.check_type, h.status, h.message, h.details, h.checked_at
+            h.check_type, h.status, h.message
         FROM source_health_checks h
         JOIN sources s ON s.id = h.source_id
         LEFT JOIN organizations o ON o.id = s.tenant_id

src/static/dashboard.html

@@ -708,7 +708,7 @@
 
   <script src="/static/js/app.js?v=20260509d"></script>
   <script src="/static/js/sources.js?v=20260509d"></script>
-  <script src="/static/js/source-health.js?v=20260509d"></script>
+  <script src="/static/js/source-health.js?v=20260509e"></script>
   <script src="/static/js/audit.js?v=20260509d"></script>
   <div id="toastContainer" class="toast-container" aria-live="polite" aria-atomic="true"></div>
 </body>

src/static/js/source-health.js

@@ -6,6 +6,11 @@ let suggestionsCache = [];
 let healthFilters = { status: "", check_type: "", org: "all" };
 let healthHistoryCache = [];
 
+// 60-Sekunden-Cache, damit Tab-Wechsel nicht jedes Mal die volle Antwort neu lädt.
+// Bei Mutationen (Vorschlag annehmen/ablehnen, run-stream, search-fix) wird mit force=true neu geladen.
+let healthDataCache = { health: null, suggestions: null, history: null, ts: 0 };
+const HEALTH_CACHE_TTL_MS = 60000;
+
 
 const CHECK_TYPE_LABELS = {
   reachability: "Erreichbarkeit",
@@ -38,7 +43,15 @@ function setupHealthTab() {
 document.addEventListener("DOMContentLoaded", setupHealthTab);
 
 // --- Health-Daten laden ---
-async function loadHealthData() {
+async function loadHealthData(force = false) {
+  const now = Date.now();
+  if (!force && healthDataCache.health && (now - healthDataCache.ts) < HEALTH_CACHE_TTL_MS) {
+    healthData = healthDataCache.health;
+    suggestionsCache = healthDataCache.suggestions;
+    healthHistoryCache = healthDataCache.history;
+    renderHealthDashboard();
+    return;
+  }
   try {
     const [health, suggestions, history] = await Promise.all([
       API.get("/api/sources/health"),
@@ -48,6 +61,7 @@ async function loadHealthData() {
     healthData = health;
     suggestionsCache = suggestions;
     healthHistoryCache = history || [];
+    healthDataCache = { health, suggestions, history: history || [], ts: Date.now() };
     renderHealthDashboard();
   } catch (err) {
     console.error("Health-Daten laden fehlgeschlagen:", err);
@@ -289,7 +303,7 @@ async function handleSuggestion(id, accept) {
     if (result.action) {
       showToast("Ergebnis: " + result.action, "success");
     }
-    loadHealthData();
+    loadHealthData(true);
     // Grundquellen-Liste auch aktualisieren
     if (typeof loadGlobalSources === "function") loadGlobalSources();
   } catch (err) {
@@ -371,7 +385,7 @@ async function runHealthCheck() {
       }
     }
 
-    loadHealthData();
+    loadHealthData(true);
   } catch (err) {
     progressEl.innerHTML = '<span class="text-danger">Fehler: ' + esc(err.message) + '</span>';
   } finally {
@@ -419,7 +433,7 @@ async function searchFix(btn) {
       msg += `\n\nKosten: $${result.cost_usd.toFixed(2)}`;
     }
     showToast(msg, "info");
-    loadHealthData();
+    loadHealthData(true);
   } catch (err) {
     showToast("Fehler: " + err.message, "error");
   } finally {