diff --git a/backend/utils/socket.js b/backend/utils/socket.js
index d1a2dfc..6c4e5fb 100644
--- a/backend/utils/socket.js
+++ b/backend/utils/socket.js
@@ -14,15 +14,19 @@ export function setupWebSocket(server) {
     });
 
     io.on('connection', (socket) => {
+        console.log('[socket.io] connection established:', socket.id, 'from', socket.handshake.address);
+
         socket.on('setUserId', (userId) => {
             if (userId) {
                 socket.userId = userId;
                 userSockets[userId] = socket.id;
+                console.log('[socket.io] setUserId received:', userId, '→ socket', socket.id);
             }
         });
         socket.on('disconnect', () => {
             if (socket.userId) {
                 delete userSockets[socket.userId];
+                console.log('[socket.io] disconnected:', socket.id, 'for userId', socket.userId);
             }
         });
     });
@@ -47,9 +51,12 @@ export async function notifyUser(recipientHashedUserId, event, data) {
         if (recipientUser) {
             const socketId = userSockets[recipientUser.hashedId];
             if (socketId) {
+                console.log('[socket.io] notifyUser → emit:', event, 'to socket', socketId, 'user', recipientUser.hashedId, 'data:', JSON.stringify(data));
                 setTimeout(() => {
                     io.to(socketId).emit(event, data);
                 }, 250);
+            } else {
+                console.warn('[socket.io] notifyUser: no socket registered for user', recipientUser.hashedId);
             }
         } else {
             console.log(`Benutzer mit gehashter ID ${recipientHashedUserId} nicht gefunden.`);
@@ -57,7 +64,7 @@ export async function notifyUser(recipientHashedUserId, event, data) {
     } catch (err) {
         console.error('Fehler beim Senden der Benachrichtigung:', err);
     }
-    console.log('done sending socket');
+    console.log('[socket.io] notifyUser done');
 }
 
 export async function notifyAllUsers(event, data) {