fix Analyse

backend/analytics-db.js

@@ -26,6 +26,7 @@ function saveDB(data) {
 }
 
 let db = loadDB();
+let dirty = false;
 
 function nextId() {
   db._counter = (db._counter || 0) + 1;
@@ -45,10 +46,20 @@ export function trackEvent(type, userId, metadata = {}) {
     ...metadata,
   };
   db.events.push(event);
-  saveDB(db);
+  dirty = true;
   return event;
 }
 
+function flushToDisk() {
+  if (!dirty) return;
+  dirty = false;
+  saveDB(db);
+}
+
+setInterval(flushToDisk, 5000);
+process.on('SIGTERM', () => { flushToDisk(); process.exit(0); });
+process.on('SIGINT', () => { flushToDisk(); process.exit(0); });
+
 export function getEvents({ from, to, type, user_id, limit = 100 } = {}) {
   let results = [...db.events];
 

backend/server.js

@@ -40,6 +40,20 @@ app.use('/api/auth', authRouter);
 app.use('/api/recipes', recipesRouter);
 app.use('/api/analytics', authMiddleware, adminMiddleware, analyticsRouter);
 
+app.use((err, req, res, next) => {
+  console.error('Server Fehler:', err.message);
+  if (!res.headersSent) {
+    res.status(500).json({ error: 'Interner Serverfehler' });
+  }
+});
+
+process.on('uncaughtException', (err) => {
+  console.error('Uncaught Exception:', err.message);
+});
+process.on('unhandledRejection', (err) => {
+  console.error('Unhandled Rejection:', err?.message || err);
+});
+
 const adminUser = process.env.ADMIN_USER || 'admin';
 const adminPass = process.env.ADMIN_PASS || 'admin123';
 

frontend/src/api.js

@@ -82,7 +82,8 @@ async function analyticsFetch(url, token) {
     try { msg = JSON.parse(text).error || msg; } catch {}
     throw new Error(msg);
   }
-  return JSON.parse(text);
+  if (!text) return [];
+  try { return JSON.parse(text); } catch { return []; }
 }
 
 export async function fetchAnalyticsOverview(token) {

frontend/src/pages/Analytics.jsx

@@ -77,16 +77,16 @@ export default function Analytics() {
   const load = async () => {
     try {
       const thirtyDaysAgo = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000).toISOString().slice(0, 10);
-      const [ov, pv, us, act] = await Promise.all([
+      const ov = await fetchAnalyticsOverview(token);
-        fetchAnalyticsOverview(token),
+      setOverview(ov);
+      const [pv, us, act] = await Promise.allSettled([
         fetchAnalyticsPageviews(token, thirtyDaysAgo),
         fetchAnalyticsUsers(token),
         fetchAnalyticsActivity(token),
       ]);
-      setOverview(ov);
+      if (pv.status === 'fulfilled') setPageviews(pv.value);
-      setPageviews(pv);
+      if (us.status === 'fulfilled') setUsers(us.value);
-      setUsers(us);
+      if (act.status === 'fulfilled') setActivity(act.value);
-      setActivity(act);
     } catch (e) {
       console.error('Analytics Fehler:', e);
       setError(e.message);