diff --git a/backend/src/index.js b/backend/src/index.js
index 66d86a2..95b66f9 100644
--- a/backend/src/index.js
+++ b/backend/src/index.js
@@ -16,7 +16,35 @@ app.use((req, res, next) => {
         const jwt = require('jsonwebtoken');
         const p = jwt.verify(auth.slice(7), process.env.JWT_SECRET || 'dev-secret');
         if (p?.id) {
+          // Prüfen ob User vorher >15 Min inaktiv war → "gerade online gegangen"
+          const user = db.prepare('SELECT last_active_at, role FROM users WHERE id=?').get(p.id);
+          const wasInactive = !user?.last_active_at ||
+            (Date.now() - new Date(user.last_active_at).getTime()) > 15 * 60 * 1000;
+
           db.prepare("UPDATE users SET last_active_at=datetime('now','localtime') WHERE id=?").run(p.id);
+
+          // Pushover an alle Admins (außer wenn User selbst Admin ist)
+          if (wasInactive && user?.role !== 'admin') {
+            const username = db.prepare('SELECT username FROM users WHERE id=?').get(p.id)?.username || 'Jemand';
+            const admins   = db.prepare(`
+              SELECT p.user_key, p.app_token FROM pushover_settings p
+              JOIN users u ON u.id = p.user_id
+              WHERE u.role = 'admin' AND p.user_key IS NOT NULL AND p.app_token IS NOT NULL
+            `).all();
+            for (const admin of admins) {
+              fetch('https://api.pushover.net/1/messages.json', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                  token:   admin.app_token,
+                  user:    admin.user_key,
+                  title:   '👤 DickenDock',
+                  message: `${username} ist gerade online gegangen.`,
+                  priority: -1,
+                }),
+              }).catch(() => {});
+            }
+          }
         }
       } catch {}
     }