Refactor event handling in CalendarView: Simplify event update and creation logic by removing unnecessary response handling. Implement event reloading after save and delete operations to ensure a clean state. This enhancement improves the reliability of event management in the calendar.

backend/services/newsService.js

@@ -6,6 +6,10 @@
 
 const NEWS_BASE = 'https://newsdata.io/api/1/news';
 
+// Cache für News-Ergebnisse (pro Sprache/Kategorie)
+const newsCache = new Map();
+const CACHE_TTL = 5 * 60 * 1000; // 5 Minuten Cache
+
 /**
  * @param {object} options
  * @param {number} options.counter - 0 = erste Seite, 1 = zweite, … (für Pagination/nextPage)
@@ -13,7 +17,7 @@ const NEWS_BASE = 'https://newsdata.io/api/1/news';
  * @param {string} [options.category] - z. B. top, technology
  * @returns {Promise<{ results: Array, nextPage: string|null }>}
  */
-async function fetchNewsPage({ counter, language = 'de', category = 'top', nextPageToken = null }) {
+async function fetchNewsPage({ language = 'de', category = 'top', nextPageToken = null }) {
     const apiKey = process.env.NEWSDATA_IO_API_KEY;
     if (!apiKey || !apiKey.trim()) {
         throw new Error('NEWSDATA_IO_API_KEY is not set in .env');
@@ -37,9 +41,64 @@ async function fetchNewsPage({ counter, language = 'de', category = 'top', nextP
     };
 }
 
+/**
+ * Holt gecachte Artikel oder lädt sie von der API
+ */
+async function getCachedNews({ language = 'de', category = 'top', minArticles = 10 }) {
+    const cacheKey = `${language}:${category}`;
+    const cached = newsCache.get(cacheKey);
+    
+    // Cache gültig?
+    if (cached && (Date.now() - cached.timestamp) < CACHE_TTL) {
+        // Wenn wir mehr Artikel brauchen, erweitern
+        if (cached.articles.length >= minArticles) {
+            return cached.articles;
+        }
+    }
+    
+    // Neue Daten laden
+    const collected = cached?.articles || [];
+    let nextPageToken = cached?.nextPage || null;
+    
+    while (collected.length < minArticles) {
+        try {
+            const page = await fetchNewsPage({
+                language,
+                category,
+                nextPageToken: nextPageToken || undefined
+            });
+            const items = page.results ?? [];
+            
+            // Duplikate vermeiden (nach title)
+            const existingTitles = new Set(collected.map(a => a.title));
+            for (const item of items) {
+                if (!existingTitles.has(item.title)) {
+                    collected.push(item);
+                    existingTitles.add(item.title);
+                }
+            }
+            
+            nextPageToken = page.nextPage ?? null;
+            if (items.length === 0 || !nextPageToken) break;
+        } catch (error) {
+            console.error('News fetch error:', error);
+            break;
+        }
+    }
+    
+    // Cache aktualisieren
+    newsCache.set(cacheKey, {
+        articles: collected,
+        nextPage: nextPageToken,
+        timestamp: Date.now()
+    });
+    
+    return collected;
+}
+
 /**
  * Liefert den N-ten Artikel (counter = 0, 1, 2, …) für das N-te News-Widget.
- * Lädt ggf. mehrere Seiten, bis genug Artikel vorhanden sind; jede Widget-Instanz bekommt einen anderen Artikel.
+ * Nutzt Cache, damit mehrere Widgets unterschiedliche Artikel bekommen.
  *
  * @param {object} options
  * @param {number} options.counter - Index des Artikels (0 = erster, 1 = zweiter, …)
@@ -49,22 +108,15 @@ async function fetchNewsPage({ counter, language = 'de', category = 'top', nextP
  */
 async function getNews({ counter = 0, language = 'de', category = 'top' }) {
     const neededIndex = Math.max(0, counter);
-    const collected = [];
-    let nextPageToken = null;
+    
+    // Mindestens so viele Artikel laden wie benötigt
+    const articles = await getCachedNews({
+        language,
+        category,
+        minArticles: neededIndex + 1
+    });
 
-    while (collected.length <= neededIndex) {
-        const page = await fetchNewsPage({
-            language,
-            category,
-            nextPageToken: nextPageToken || undefined
-        });
-        const items = page.results ?? [];
-        collected.push(...items);
-        nextPageToken = page.nextPage ?? null;
-        if (items.length === 0 || !nextPageToken) break;
-    }
-
-    const single = collected[neededIndex] ? [collected[neededIndex]] : [];
+    const single = articles[neededIndex] ? [articles[neededIndex]] : [];
     return { results: single, nextPage: null };
 }