Cache dagsmart API responses for 1 hour

server.js

@@ -5,13 +5,24 @@ import { dirname, join } from 'path';
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const app = express();
 
+const cache = new Map();
+const TTL = 60 * 60 * 1000; // 1 hour
+
+async function cachedFetch(url) {
+  const entry = cache.get(url);
+  if (entry && Date.now() - entry.ts < TTL) return entry.data;
+  const response = await fetch(url);
+  const data = await response.json();
+  cache.set(url, { data, ts: Date.now() });
+  return data;
+}
+
 app.use(express.static(join(__dirname, 'public')));
 
 app.get('/api/holidays', async (req, res) => {
   const { year } = req.query;
   try {
-    const response = await fetch(`https://api.dagsmart.se/holidays?year=${year}&weekends=false`);
-    const data = await response.json();
+    const data = await cachedFetch(`https://api.dagsmart.se/holidays?year=${year}&weekends=false`);
     res.json(data);
   } catch (err) {
     res.status(500).json({ error: String(err) });
@@ -21,8 +32,7 @@ app.get('/api/holidays', async (req, res) => {
 app.get('/api/bridge-days', async (req, res) => {
   const { year } = req.query;
   try {
-    const response = await fetch(`https://api.dagsmart.se/bridge-days?year=${year}`);
-    const data = await response.json();
+    const data = await cachedFetch(`https://api.dagsmart.se/bridge-days?year=${year}`);
     res.json(data);
   } catch (err) {
     res.status(500).json({ error: String(err) });