diff --git a/app.py b/app.py
index a3c57ae..d934858 100644
--- a/app.py
+++ b/app.py
@@ -7,6 +7,10 @@ from logging.handlers import TimedRotatingFileHandler
 from datetime import datetime, timedelta
 from flask import Flask, render_template, redirect, url_for, send_from_directory, request, jsonify
 
+# Logging-Verzeichnis (muss VOR cleanup_old_log_dirs definiert werden!)
+LOG_DIR = 'logs'
+os.makedirs(LOG_DIR, exist_ok=True)
+
 # ── Cleanup Log-Files ────────────────────────────────────────────────────────────────
 def cleanup_old_log_dirs(max_age_days=90):
     """Löscht Monatsordner in logs/, die älter als max_age_days sind"""