diff --git a/app.py b/app.py
index 820abd8..120c19f 100644
--- a/app.py
+++ b/app.py
@@ -4210,6 +4210,118 @@ def robots_txt():
     )
     return content, 200, {"Content-Type": "text/plain"}
 
+@app.route('/debug-socket')
+@login_required  # opcjonalnie
+def debug_socket():
+    return render_template_string('''
+<!DOCTYPE html>
+<html>
+<head>
+    <title>Socket Debug</title>
+    <script src="https://cdn.socket.io/4.7.5/socket.io.min.js"></script>
+    <style>
+        body { font-family: monospace; background: #1e1e1e; color: #fff; padding: 20px; }
+        #log { height: 400px; overflow-y: scroll; background: #2d2d2d; padding: 15px; border-radius: 8px; margin: 10px 0; white-space: pre-wrap; }
+        button { background: #007bff; color: white; border: none; padding: 10px 20px; margin: 5px; border-radius: 5px; cursor: pointer; }
+        button:hover { background: #0056b3; }
+        .status { font-size: 18px; font-weight: bold; margin: 10px 0; }
+        .connected { color: #28a745; }
+        .disconnected { color: #dc3545; }
+    </style>
+</head>
+<body>
+    <h1>Socket.IO Debug Tool</h1>
+    
+    <div id="status" class="status disconnected">Rozlaczony</div>
+    <div id="info">
+        Transport: <span id="transport">-</span> | 
+        Ping: <span id="ping">-</span>ms | 
+        SID: <span id="sid">-</span>
+    </div>
+    
+    <button onclick="connect()">Polacz</button>
+    <button onclick="disconnect()">Rozlacz</button>
+    <button onclick="emitTest()">Emit Test</button>
+    <button onclick="simulateBackground()">Symuluj background (30s)</button>
+    
+    <h3>Logi:</h3>
+    <div id="log"></div>
+
+    <script>
+        let socket;
+        let logLines = 0;
+        
+        function log(msg, color = '#fff') {
+            const logEl = document.getElementById('log');
+            logEl.innerHTML += `[${new Date().toLocaleTimeString()}] ${msg}\n`;
+            logEl.scrollTop = logEl.scrollHeight;
+            logLines++;
+            if (logLines > 100) logEl.innerHTML = logEl.innerHTML.split('\\n').slice(-100).join('\\n');
+        }
+        
+        function updateStatus(connected) {
+            const status = document.getElementById('status');
+            status.textContent = connected ? 'Polaczony' : 'Rozlaczony';
+            status.className = `status ${connected ? 'connected' : 'disconnected'}`;
+        }
+        
+        function connect() {
+            if (socket) socket.disconnect();
+            
+            socket = io('', {
+                transports: ['websocket', 'polling'],
+                timeout: 20000,
+                autoConnect: false
+            });
+            
+            socket.on('connect', () => {
+                log('CONNECTED', '#28a745');
+                updateStatus(true);
+                document.getElementById('transport').textContent = socket.io.engine.transport.name;
+                document.getElementById('sid').textContent = socket.id?.slice(0,8) + '...';
+                socket.emit('requestfulllist', {listid: window.LISTID || 1});
+            });
+            
+            socket.on('disconnect', (reason) => {
+                log(`DISCONNECTED: ${reason}`, '#dc3545');
+                updateStatus(false);
+            });
+            
+            socket.on('connect_error', (err) => {
+                log(`CONNECT ERROR: ${err.message}`, '#ffc107');
+            });
+            
+            socket.onAny((event, ...args) => {
+                log(`RECEIVED: ${event} ${JSON.stringify(args)}`);
+            });
+            
+            socket.connect();
+        }
+        
+        function disconnect() {
+            if (socket) socket.disconnect();
+        }
+        
+        function emitTest() {
+            if (!socket?.connected) return log('Niepolaczony!', '#dc3545');
+            socket.emit('additem', {listid: 1, name: 'TEST ITEM', quantity: 1});
+            log('SENT: additem test');
+        }
+        
+        function simulateBackground() {
+            log('Symulacja backgroundu... (zamknij/otworz karte za 30s)');
+            setTimeout(() => {
+                if (socket?.connected) log('Przetrwal symulacje!');
+                else log('Disconnect po symulacji!');
+            }, 30000);
+        }
+        
+        connect();
+    </script>
+</body>
+</html>
+    ''')
+
 
 # =========================================================================================
 # SOCKET.IO
