diff --git a/main.py b/main.py
index 8320884..299dc2f 100644
--- a/main.py
+++ b/main.py
@@ -7,6 +7,7 @@ import asyncio
 import openai
 import re
 import httpx
+import subprocess
 from google import genai
 from google.genai import types
 import json
@@ -211,38 +212,53 @@ async def check_and_update_node(node_id: int):
     if not node:
         conn.close()
         return "Node nicht gefunden"
-        
-    # Dieser geniale Einzeiler holt uns Architektur, Docker-Status und das OS
-    check_cmd = """
-    arch=$(uname -m);
-    dock=$(command -v docker >/dev/null 2>&1 && echo 1 || echo 0);
-    os=$(grep '^ID=' /etc/os-release 2>/dev/null | cut -d= -f2 | tr -d '"');
-    [ -z "$os" ] && os=$(uname -s);
-    vnc=$(command -v vncserver >/dev/null 2>&1 && echo 1 || echo 0);
-    echo "$arch|$dock|$os|$vnc"
-    """
-    
-    ssh_cmd = f"ssh -o StrictHostKeyChecking=no -o ConnectTimeout=3 {node['user']}@{node['ip']} '{check_cmd}'"
-    
+
+    # Wir bauen den Befehl kompakt zusammen
+    # Nutze im Grep nun doppelte Anführungszeichen, um Konflikte zu vermeiden
+    check_cmd = (
+        'arch=$(uname -m); '
+        'dock=$(command -v docker >/dev/null 2>&1 && echo 1 || echo 0); '
+        'os=$(grep "^ID=" /etc/os-release 2>/dev/null | cut -d= -f2 | tr -d \'"\'); '
+        '[ -z "$os" ] && os=$(uname -s); '
+        'vnc=$(command -v vncserver >/dev/null 2>&1 && echo 1 || echo 0); '
+        'echo "$arch|$dock|$os|$vnc"'
+    )
+
+    # WICHTIG: Als Liste übergeben, damit kein f-String Quoting nötig ist!
+    ssh_args = [
+        "ssh", 
+        "-o", "StrictHostKeyChecking=no", 
+        "-o", "ConnectTimeout=3", 
+        f"{node['user']}@{node['ip']}", 
+        check_cmd
+    ]
+
     try:
-        output = subprocess.check_output(ssh_cmd, shell=True).decode().strip()
+        # Kein shell=True mehr nötig
+        output = subprocess.check_output(ssh_args, stderr=subprocess.STDOUT).decode().strip()
+        
+        # Debugging: Falls doch was schief geht, sehen wir es im Log
+        if "|" not in output:
+            raise ValueError(f"Unerwarteter Output: {output}")
+
         arch, dock, os_name, vnc = output.split('|')
-        
         status = "Docker Aktiv" if dock == "1" else "Bereit (Kein Docker)"
-        
+
         conn.execute('''
             UPDATE nodes 
             SET status=?, arch=?, docker=?, os=?, vnc=? 
             WHERE id=?
         ''', (status, arch, int(dock), os_name, int(vnc), node_id))
         conn.commit()
-        conn.close()
         return status
+    
     except Exception as e:
+        print(f"Fehler bei Node {node_id} ({node['ip']}): {e}")
         conn.execute("UPDATE nodes SET status='Offline/Fehler' WHERE id=?", (node_id,))
         conn.commit()
-        conn.close()
         return "Offline/Fehler"
+    finally:
+        conn.close()
 
 # --- Routen ---