"Update template files and add windows fixes"

backend/app/app.py

@@ -17,6 +17,16 @@ from typing import List, Dict, Tuple
 import time
 import subprocess
 import json
+import signal
+
+# Windows-spezifische Fixes früh importieren
+if os.name == 'nt':
+    try:
+        from utils.windows_fixes import get_windows_thread_manager, apply_all_windows_fixes
+        apply_all_windows_fixes()
+    except ImportError:
+        # Fallback falls windows_fixes nicht verfügbar
+        get_windows_thread_manager = None
 
 # Lokale Imports
 from models import init_database, create_initial_admin, User, Printer, Job, Stats, SystemLog, get_db_session, GuestRequest, UserPermission, Notification
@@ -4177,10 +4187,46 @@ def trigger_queue_check():
 # ===== STARTUP UND MAIN =====
 if __name__ == "__main__":
     import sys
+    import signal
+    import os
     
     # Debug-Modus prüfen
     debug_mode = len(sys.argv) > 1 and sys.argv[1] == "--debug"
     
+    # Windows-spezifisches Signal-Handling für ordnungsgemäßes Shutdown
+    def signal_handler(sig, frame):
+        """Signal-Handler für ordnungsgemäßes Shutdown."""
+        app_logger.warning(f"🛑 Signal {sig} empfangen - fahre System herunter...")
+        try:
+            # Queue Manager stoppen
+            app_logger.info("🔄 Beende Queue Manager...")
+            stop_queue_manager()
+            
+            # Scheduler stoppen falls aktiviert
+            if SCHEDULER_ENABLED and scheduler:
+                try:
+                    scheduler.shutdown(wait=False)
+                    app_logger.info("Job-Scheduler gestoppt")
+                except Exception as e:
+                    app_logger.error(f"Fehler beim Stoppen des Schedulers: {str(e)}")
+            
+            app_logger.info("✅ Shutdown abgeschlossen")
+            sys.exit(0)
+        except Exception as e:
+            app_logger.error(f"❌ Fehler beim Shutdown: {str(e)}")
+            sys.exit(1)
+    
+    # Signal-Handler registrieren (Windows-kompatibel)
+    if os.name == 'nt':  # Windows
+        signal.signal(signal.SIGINT, signal_handler)
+        signal.signal(signal.SIGTERM, signal_handler)
+        # Zusätzlich für Flask-Development-Server
+        signal.signal(signal.SIGBREAK, signal_handler)
+    else:  # Unix/Linux
+        signal.signal(signal.SIGINT, signal_handler)
+        signal.signal(signal.SIGTERM, signal_handler)
+        signal.signal(signal.SIGHUP, signal_handler)
+    
     try:
         # Datenbank initialisieren
         init_database()
@@ -4190,19 +4236,26 @@ if __name__ == "__main__":
         register_template_helpers(app)
         
         # Queue-Manager für automatische Drucker-Überwachung starten
-        try:
+        # Nur im Hauptprozess starten (nicht bei Flask Auto-Reload)
-            queue_manager = start_queue_manager()
+        if not debug_mode or os.environ.get('WERKZEUG_RUN_MAIN') == 'true':
-            app_logger.info("✅ Printer Queue Manager erfolgreich gestartet")
+            try:
-            
+                queue_manager = start_queue_manager()
-            # Shutdown-Handler registrieren
+                app_logger.info("✅ Printer Queue Manager erfolgreich gestartet")
-            def cleanup_queue_manager():
-                app_logger.info("🔄 Beende Queue Manager...")
-                stop_queue_manager()
                 
-            atexit.register(cleanup_queue_manager)
+                # Verbesserte Shutdown-Handler registrieren
-            
+                def cleanup_queue_manager():
-        except Exception as e:
+                    try:
-            app_logger.error(f"❌ Fehler beim Starten des Queue-Managers: {str(e)}")
+                        app_logger.info("🔄 Beende Queue Manager...")
+                        stop_queue_manager()
+                    except Exception as e:
+                        app_logger.error(f"❌ Fehler beim Queue Manager Cleanup: {str(e)}")
+                    
+                atexit.register(cleanup_queue_manager)
+                
+            except Exception as e:
+                app_logger.error(f"❌ Fehler beim Starten des Queue-Managers: {str(e)}")
+        else:
+            app_logger.info("🔄 Flask Auto-Reload erkannt - Queue Manager wird im Hauptprozess gestartet")
         
         # Scheduler starten (falls aktiviert)
         if SCHEDULER_ENABLED:
@@ -4215,12 +4268,25 @@ if __name__ == "__main__":
         if debug_mode:
             # Debug-Modus: HTTP auf Port 5000
             app_logger.info("Starte Debug-Server auf 0.0.0.0:5000 (HTTP)")
-            app.run(
+            
-                host="0.0.0.0",
+            # Windows-spezifische Flask-Konfiguration für bessere Thread-Behandlung
-                port=5000,
+            if os.name == 'nt':
-                debug=True,
+                app.run(
-                threaded=True
+                    host="0.0.0.0",
-            )
+                    port=5000,
+                    debug=True,
+                    threaded=True,
+                    use_reloader=True,
+                    reloader_interval=1,
+                    passthrough_errors=False
+                )
+            else:
+                app.run(
+                    host="0.0.0.0",
+                    port=5000,
+                    debug=True,
+                    threaded=True
+                )
         else:
             # Produktions-Modus: HTTPS auf Port 443
             ssl_context = get_ssl_context()
@@ -4243,6 +4309,14 @@ if __name__ == "__main__":
                     threaded=True
                 )
             
+    except KeyboardInterrupt:
+        app_logger.info("🔄 Tastatur-Unterbrechung empfangen - beende Anwendung...")
+        signal_handler(signal.SIGINT, None)
     except Exception as e:
         app_logger.error(f"Fehler beim Starten der Anwendung: {str(e)}")
+        # Cleanup bei Fehler
+        try:
+            stop_queue_manager()
+        except:
+            pass
         sys.exit(1)

backend/app/templates/base.html

@@ -108,7 +108,7 @@
                 <div class="flex-shrink-0">
                     <a href="{{ url_for('dashboard') }}" class="navbar-brand" aria-label="Zur Startseite">
                         <!-- Mercedes-Benz Logo -->
-                        <div class="w-9 h-9 sm:w-10 sm:h-10 lg:w-12 lg:h-12 transition-all duration-300 group-hover:rotate-12">
+                        <div class="w-7 h-7 sm:w-8 sm:h-8 lg:w-9 lg:h-9 transition-all duration-300 group-hover:rotate-12">
                             <svg class="w-full h-full text-slate-900 dark:text-white transition-colors duration-300" fill="currentColor" viewBox="0 0 80 80" aria-hidden="true">
                                 <path d="M58.6,4.5C53,1.6,46.7,0,40,0c-6.7,0-13,1.6-18.6,4.5v0C8.7,11.2,0,24.6,0,40c0,15.4,8.7,28.8,21.5,35.5
                                 C27,78.3,33.3,80,40,80c6.7,0,12.9-1.7,18.5-4.6C71.3,68.8,80,55.4,80,40C80,24.6,71.3,11.2,58.6,4.5z M4,40
@@ -120,8 +120,8 @@
                         </div>
                         <!-- Brand Text -->
                         <div class="flex flex-col ml-2">
-                            <span class="text-xl lg:text-2xl font-bold text-slate-900 dark:text-white transition-colors duration-300 tracking-tight">Mercedes-Benz</span>
+                            <span class="text-lg lg:text-xl font-bold text-slate-900 dark:text-white transition-colors duration-300 tracking-tight">Mercedes-Benz</span>
-                            <span class="text-xs lg:text-sm text-slate-600 dark:text-slate-400 font-medium transition-colors duration-300">MYP 3D-Druck Platform</span>
+                            <span class="text-xs font-medium text-slate-600 dark:text-slate-400 transition-colors duration-300">MYP 3D-Druck Platform</span>
                         </div>
                     </a>
                 </div>

backend/app/templates/calendar.html

@@ -251,7 +251,7 @@
             <div class="flex justify-between items-center mb-8">
                 <div>
                     <h3 id="modalTitle" class="text-2xl font-bold text-slate-900 dark:text-white mb-2">
-                        ⚡ Neuen Produktionsauftrag erstellen
+                        Neuen Produktionsauftrag erstellen
                     </h3>
                     <p class="text-slate-600 dark:text-slate-400">Planen Sie Ihren nächsten 3D-Druckauftrag mit Präzision</p>
                 </div>
@@ -269,7 +269,7 @@
                     <!-- Titel -->
                     <div class="md:col-span-2">
                         <label for="eventTitle" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            📝 Auftrags-Bezeichnung
+                            Auftrags-Bezeichnung
                         </label>
                         <input type="text" id="eventTitle" name="title" required
                                class="w-full px-6 py-4 border border-slate-200 dark:border-slate-600 rounded-2xl bg-white/90 dark:bg-slate-700/90 backdrop-blur-sm text-slate-800 dark:text-white focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 transition-all duration-300"
@@ -279,7 +279,7 @@
                     <!-- Beschreibung -->
                     <div class="md:col-span-2">
                         <label for="eventDescription" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            📋 Detaillierte Beschreibung
+                            Detaillierte Beschreibung
                         </label>
                         <textarea id="eventDescription" name="description" rows="3"
                                   class="w-full px-6 py-4 border border-slate-200 dark:border-slate-600 rounded-2xl bg-white/90 dark:bg-slate-700/90 backdrop-blur-sm text-slate-800 dark:text-white focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 transition-all duration-300 resize-none"
@@ -289,14 +289,14 @@
                     <!-- Drucker -->
                     <div>
                         <label for="eventPrinter" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            🏭 Produktionseinheit
+                            Produktionseinheit
                         </label>
                         <div class="relative">
                             <select id="eventPrinter" name="printerId" required
                                     class="appearance-none w-full px-6 py-4 pr-12 border border-slate-200 dark:border-slate-600 rounded-2xl bg-white/90 dark:bg-slate-700/90 backdrop-blur-sm text-slate-800 dark:text-white focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 transition-all duration-300 cursor-pointer">
                                 <option value="">Drucker auswählen</option>
                                 {% for printer in printers %}
-                                <option value="{{ printer.id }}">{{ printer.name }} {% if printer.location %}📍 {{ printer.location }}{% endif %}</option>
+                                <option value="{{ printer.id }}">{{ printer.name }} {% if printer.location %}({{ printer.location }}){% endif %}</option>
                                 {% endfor %}
                             </select>
                             <div class="absolute inset-y-0 right-0 flex items-center pr-4 pointer-events-none">
@@ -310,14 +310,14 @@
                     <!-- Priorität -->
                     <div>
                         <label for="eventPriority" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            ⭐ Prioritätsstufe
+                            Prioritätsstufe
                         </label>
                         <div class="relative">
                             <select id="eventPriority" name="priority"
                                     class="appearance-none w-full px-6 py-4 pr-12 border border-slate-200 dark:border-slate-600 rounded-2xl bg-white/90 dark:bg-slate-700/90 backdrop-blur-sm text-slate-800 dark:text-white focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 transition-all duration-300 cursor-pointer">
-                                <option value="normal">🔵 Standard</option>
+                                <option value="normal">Standard</option>
-                                <option value="high">🟡 Hoch</option>
+                                <option value="high">Hoch</option>
-                                <option value="urgent">🔴 Dringend</option>
+                                <option value="urgent">Dringend</option>
                             </select>
                             <div class="absolute inset-y-0 right-0 flex items-center pr-4 pointer-events-none">
                                 <svg class="h-5 w-5 text-slate-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -330,7 +330,7 @@
                     <!-- Start-Zeit -->
                     <div>
                         <label for="eventStart" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            🕐 Produktionsstart
+                            Produktionsstart
                         </label>
                         <input type="datetime-local" id="eventStart" name="start" required
                                class="w-full px-6 py-4 border border-slate-200 dark:border-slate-600 rounded-2xl bg-white/90 dark:bg-slate-700/90 backdrop-blur-sm text-slate-800 dark:text-white focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 transition-all duration-300">
@@ -339,7 +339,7 @@
                     <!-- End-Zeit -->
                     <div>
                         <label for="eventEnd" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            🏁 Produktionsende
+                            Produktionsende
                         </label>
                         <input type="datetime-local" id="eventEnd" name="end" required
                                class="w-full px-6 py-4 border border-slate-200 dark:border-slate-600 rounded-2xl bg-white/90 dark:bg-slate-700/90 backdrop-blur-sm text-slate-800 dark:text-white focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 transition-all duration-300">
@@ -354,11 +354,11 @@
                     </button>
                     <button type="submit" 
                             class="px-8 py-3 bg-gradient-to-r from-blue-500 to-blue-600 text-white rounded-2xl hover:from-blue-600 hover:to-blue-700 transition-all duration-300 shadow-lg hover:shadow-xl font-medium">
-                        💾 Auftrag speichern
+                        Auftrag speichern
                     </button>
                     <button type="button" id="deleteEventBtn" onclick="deleteEvent()" style="display: none;"
                             class="px-8 py-3 bg-gradient-to-r from-red-500 to-red-600 text-white rounded-2xl hover:from-red-600 hover:to-red-700 transition-all duration-300 shadow-lg hover:shadow-xl font-medium">
-                        🗑️ Löschen
+                        Löschen
                     </button>
                 </div>
             </form>
@@ -446,7 +446,7 @@ document.addEventListener('DOMContentLoaded', function() {
             if (canEdit) {
                 // Edit existing event
                 openCreateEventModal();
-                document.getElementById('modalTitle').textContent = '⚡ Produktionsauftrag bearbeiten';
+                document.getElementById('modalTitle').textContent = 'Produktionsauftrag bearbeiten';
                 document.getElementById('eventId').value = info.event.id;
                 document.getElementById('eventTitle').value = info.event.title;
                 document.getElementById('eventDescription').value = info.event.extendedProps.description || '';

backend/app/templates/guest_request.html

@@ -237,14 +237,14 @@
                     {% if printers %}
                     <div class="group">
                         <label for="printer_id" class="block text-sm font-semibold text-slate-700 dark:text-slate-300 mb-3">
-                            🏭 Bevorzugte Produktionseinheit
+                            Bevorzugte Produktionseinheit
                         </label>
                         <div class="relative">
                             <select name="printer_id" id="printer_id"
                                     class="appearance-none input-field w-full px-6 py-4 pr-12 border border-slate-200 dark:border-slate-600 rounded-2xl focus:ring-4 focus:ring-blue-500/25 focus:border-blue-500 dark:text-white font-medium cursor-pointer">
-                                <option value="">🤖 Automatische Zuweisung</option>
+                                <option value="">Automatische Zuweisung</option>
                                 {% for printer in printers %}
-                                <option value="{{ printer.id }}">{{ printer.name }} {% if printer.location %}📍 {{ printer.location }}{% endif %}</option>
+                                <option value="{{ printer.id }}">{{ printer.name }} {% if printer.location %}({{ printer.location }}){% endif %}</option>
                                 {% endfor %}
                             </select>
                             <div class="absolute inset-y-0 right-0 flex items-center pr-6 pointer-events-none">
@@ -254,7 +254,7 @@
                             </div>
                         </div>
                         <div class="mt-2 text-xs text-slate-500 dark:text-slate-400">
-                            💡 Lassen Sie das System den optimalen Drucker für Sie auswählen
+                            Tipp: Lassen Sie das System den optimalen Drucker für Sie auswählen
                         </div>
                     </div>
                     {% endif %}
@@ -272,7 +272,7 @@
                         </div>
                         <div class="flex-1">
                             <h3 class="text-lg font-semibold text-slate-800 dark:text-slate-200 mb-4">
-                                🏆 Mercedes-Benz Professional Service
+                                Mercedes-Benz Professional Service
                             </h3>
                             <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                                 <div class="flex items-center space-x-3">
@@ -308,7 +308,7 @@
                             <svg class="w-5 h-5 mr-3 group-hover:rotate-12 transition-transform duration-300" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                                 <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 19l9 2-9-18-9 18 9-2zm0 0v-8"/>
                             </svg>
-                            🚀 Anfrage übermitteln
+                            Anfrage übermitteln
                         </span>
                     </button>
                 </div>
@@ -365,7 +365,7 @@
                     </svg>
                 </div>
                 <h3 class="text-2xl font-bold text-slate-900 dark:text-white mb-4">
-                    🎉 Anfrage erfolgreich übermittelt!
+                    Anfrage erfolgreich übermittelt!
                 </h3>
                 <p class="text-slate-600 dark:text-slate-400 mb-6">
                     Ihre Professional-Gastanfrage wurde eingereicht und wird mit höchster Priorität bearbeitet. Sie können den Bearbeitungsstatus jederzeit unter folgendem Link verfolgen:
@@ -376,11 +376,11 @@
                 <div class="flex items-center justify-center space-x-4">
                     <button onclick="closeSuccessModal()" 
                             class="px-8 py-3 bg-gradient-to-r from-green-500 to-emerald-600 text-white rounded-2xl hover:from-green-600 hover:to-emerald-700 transition-all duration-300 shadow-lg font-medium">
-                        ✅ Verstanden
+                        Verstanden
                     </button>
                     <button onclick="copyStatusUrl()" 
                             class="px-8 py-3 border border-slate-300 dark:border-slate-600 text-slate-700 dark:text-slate-300 rounded-2xl hover:bg-slate-50 dark:hover:bg-slate-700 transition-all duration-300 font-medium">
-                        📋 Link kopieren
+                        Link kopieren
                     </button>
                 </div>
             </div>

backend/app/templates/guest_requests_overview.html

@@ -14,12 +14,25 @@
         background: rgba(15, 23, 42, 0.95);
         border: 1px solid rgba(255, 255, 255, 0.1);
     }
-    .premium-gradient {
+    
+    /* Light Mode Professional Gradient */
+    .professional-gradient {
+        background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 25%, #cbd5e1 50%, #94a3b8 75%, #64748b 100%);
+    }
+    
+    /* Dark Mode Professional Gradient */
+    .dark .professional-gradient {
         background: linear-gradient(135deg, #0f172a 0%, #1e293b 25%, #334155 50%, #475569 75%, #64748b 100%);
     }
-    .premium-shadow {
+    
+    .professional-shadow {
         box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(255, 255, 255, 0.05);
     }
+    
+    .dark .professional-shadow {
+        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.1);
+    }
+    
     .status-badge {
         @apply px-3 py-1 text-xs font-semibold rounded-full;
     }
@@ -60,14 +73,14 @@
 {% endblock %}
 
 {% block content %}
-<div class="min-h-screen">
+<div class="min-h-screen bg-gradient-to-br from-slate-100 via-blue-50 to-indigo-100 dark:from-slate-900 dark:via-slate-800 dark:to-slate-900">
     <!-- Hero Header -->
-    <div class="premium-gradient relative overflow-hidden">
+    <div class="professional-gradient relative overflow-hidden">
-        <div class="absolute inset-0 bg-black/20"></div>
+        <div class="absolute inset-0 bg-black/20 dark:bg-black/40"></div>
         <div class="relative max-w-7xl mx-auto px-6 lg:px-8 py-16">
             <div class="text-center">
                 <!-- Mercedes-Benz Logo -->
-                <div class="inline-flex items-center justify-center w-20 h-20 mercedes-glass rounded-full mb-6 premium-shadow">
+                <div class="inline-flex items-center justify-center w-20 h-20 mercedes-glass rounded-full mb-6 professional-shadow">
                     <svg class="w-10 h-10 text-white" viewBox="0 0 80 80" fill="currentColor">
                         <path d="M58.6,4.5C53,1.6,46.7,0,40,0c-6.7,0-13,1.6-18.6,4.5v0C8.7,11.2,0,24.6,0,40c0,15.4,8.7,28.8,21.5,35.5
                         C27,78.3,33.3,80,40,80c6.7,0,12.9-1.7,18.5-4.6C71.3,68.8,80,55.4,80,40C80,24.6,71.3,11.2,58.6,4.5z M4,40
@@ -78,12 +91,12 @@
                     </svg>
                 </div>
                 
-                <h1 class="text-4xl md:text-5xl font-bold mb-4 text-white tracking-tight">
+                <h1 class="text-4xl md:text-5xl font-bold mb-4 text-white dark:text-slate-100 tracking-tight">
-                    <span class="bg-gradient-to-r from-white to-blue-200 bg-clip-text text-transparent">
+                    <span class="bg-gradient-to-r from-white to-blue-200 dark:from-slate-100 dark:to-slate-300 bg-clip-text text-transparent">
-                        📋 Druckanträge Übersicht
+                        Druckanträge Übersicht
                     </span>
                 </h1>
-                <p class="text-lg md:text-xl text-blue-100 max-w-3xl mx-auto leading-relaxed">
+                <p class="text-lg md:text-xl text-blue-100 dark:text-slate-300 max-w-3xl mx-auto leading-relaxed">
                     Transparente Übersicht aller eingereichten Druckanträge mit Datenschutz-konformer Darstellung
                 </p>
             </div>
@@ -94,7 +107,7 @@
     <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 -mt-8 relative z-10 pb-16">
         
         <!-- Info Banner -->
-        <div class="mercedes-glass rounded-2xl p-6 mb-8 premium-shadow">
+        <div class="mercedes-glass rounded-2xl p-6 mb-8 professional-shadow">
             <div class="flex items-start space-x-4">
                 <div class="flex-shrink-0">
                     <div class="w-12 h-12 bg-gradient-to-br from-blue-500 to-indigo-600 rounded-2xl flex items-center justify-center">
@@ -105,15 +118,15 @@
                 </div>
                 <div class="flex-1">
                     <h3 class="text-lg font-semibold text-slate-800 dark:text-slate-200 mb-2">
-                        🔒 Datenschutz & Transparenz
+                        Datenschutz & Transparenz
                     </h3>
                     <p class="text-slate-600 dark:text-slate-400 text-sm leading-relaxed">
                         Diese Übersicht zeigt alle eingereichten Druckanträge in anonymisierter Form. Persönliche Daten sind durch "***" zensiert, um die Privatsphäre zu schützen und gleichzeitig Transparenz über den Bearbeitungsstand zu gewährleisten.
                     </p>
                     <div class="mt-3 flex flex-wrap gap-2">
-                        <span class="status-badge bg-blue-100 text-blue-800 dark:bg-blue-900/30 dark:text-blue-200">✨ Datenkonform</span>
+                        <span class="status-badge bg-blue-100 text-blue-800 dark:bg-blue-900/30 dark:text-blue-200">Datenkonform</span>
-                        <span class="status-badge bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-200">🛡️ Anonymisiert</span>
+                        <span class="status-badge bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-200">Anonymisiert</span>
-                        <span class="status-badge bg-purple-100 text-purple-800 dark:bg-purple-900/30 dark:text-purple-200">👁️ Transparent</span>
+                        <span class="status-badge bg-purple-100 text-purple-800 dark:bg-purple-900/30 dark:text-purple-200">Transparent</span>
                     </div>
                 </div>
             </div>
@@ -126,27 +139,27 @@
             {% set approved_requests = requests|selectattr("status", "equalto", "approved")|list|length %}
             {% set denied_requests = requests|selectattr("status", "equalto", "denied")|list|length %}
             
-            <div class="mercedes-glass rounded-xl p-6 text-center premium-shadow">
+            <div class="mercedes-glass rounded-xl p-6 text-center professional-shadow">
                 <div class="text-3xl font-bold text-slate-900 dark:text-white mb-2">{{ total_requests }}</div>
                 <div class="text-sm text-slate-600 dark:text-slate-400">Gesamt</div>
             </div>
-            <div class="mercedes-glass rounded-xl p-6 text-center premium-shadow">
+            <div class="mercedes-glass rounded-xl p-6 text-center professional-shadow">
                 <div class="text-3xl font-bold text-yellow-600 mb-2">{{ pending_requests }}</div>
-                <div class="text-sm text-slate-600 dark:text-slate-400">🔄 Prüfung</div>
+                <div class="text-sm text-slate-600 dark:text-slate-400">Prüfung</div>
             </div>
-            <div class="mercedes-glass rounded-xl p-6 text-center premium-shadow">
+            <div class="mercedes-glass rounded-xl p-6 text-center professional-shadow">
                 <div class="text-3xl font-bold text-green-600 mb-2">{{ approved_requests }}</div>
-                <div class="text-sm text-slate-600 dark:text-slate-400">✅ Genehmigt</div>
+                <div class="text-sm text-slate-600 dark:text-slate-400">Genehmigt</div>
             </div>
-            <div class="mercedes-glass rounded-xl p-6 text-center premium-shadow">
+            <div class="mercedes-glass rounded-xl p-6 text-center professional-shadow">
                 <div class="text-3xl font-bold text-red-600 mb-2">{{ denied_requests }}</div>
-                <div class="text-sm text-slate-600 dark:text-slate-400">❌ Abgelehnt</div>
+                <div class="text-sm text-slate-600 dark:text-slate-400">Abgelehnt</div>
             </div>
         </div>
 
         <!-- Requests List -->
         {% if error %}
-        <div class="mercedes-glass rounded-2xl p-8 text-center premium-shadow">
+        <div class="mercedes-glass rounded-2xl p-8 text-center professional-shadow">
             <div class="text-red-500 mb-4">
                 <svg class="w-16 h-16 mx-auto" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                     <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4m0 4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
@@ -156,7 +169,7 @@
             <p class="text-slate-600 dark:text-slate-400">{{ error }}</p>
         </div>
         {% elif requests|length == 0 %}
-        <div class="mercedes-glass rounded-2xl p-8 text-center premium-shadow">
+        <div class="mercedes-glass rounded-2xl p-8 text-center professional-shadow">
             <div class="text-slate-400 mb-4">
                 <svg class="w-16 h-16 mx-auto" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                     <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 12h6m-6 4h6m2 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
@@ -177,7 +190,7 @@
         {% else %}
         <div class="space-y-4">
             {% for request in requests %}
-            <div class="request-card {{ request.status }} mercedes-glass rounded-2xl p-6 premium-shadow">
+            <div class="request-card {{ request.status }} mercedes-glass rounded-2xl p-6 professional-shadow">
                 <div class="flex flex-col lg:flex-row lg:items-center lg:justify-between space-y-4 lg:space-y-0">
                     
                     <!-- Left Section: Request Info -->
@@ -188,16 +201,16 @@
                             </div>
                             <div class="status-badge status-{{ request.status }}">
                                 {% if request.status == 'pending' %}
-                                    🔄 Wird geprüft
+                                    Wird geprüft
                                 {% elif request.status == 'approved' %}
-                                    ✅ Genehmigt
+                                    Genehmigt
                                 {% elif request.status == 'denied' %}
-                                    ❌ Abgelehnt
+                                    Abgelehnt
                                 {% endif %}
                             </div>
                             {% if request.job_status %}
                             <div class="status-badge bg-purple-100 text-purple-800 dark:bg-purple-900/30 dark:text-purple-200">
-                                🖨️ {{ request.job_status|title }}
+                                Druckstatus: {{ request.job_status|title }}
                             </div>
                             {% endif %}
                         </div>

backend/app/utils/queue_manager.py

@@ -9,6 +9,8 @@ import logging
 import subprocess
 import os
 import requests
+import signal
+import atexit
 from datetime import datetime, timedelta
 from typing import List, Dict, Optional, Tuple
 from contextlib import contextmanager
@@ -65,44 +67,85 @@ def check_printer_status(ip_address: str, timeout: int = 5) -> Tuple[str, bool]:
 class PrinterQueueManager:
     """
     Verwaltet die Warteschlangen für offline Drucker und überwacht deren Status.
+    Verbesserte Version mit ordnungsgemäßem Thread-Management für Windows.
     """
     
     def __init__(self):
         self.is_running = False
         self.monitor_thread = None
+        self.shutdown_event = threading.Event()  # Sauberes Shutdown-Signal
         self.check_interval = 120  # 2 Minuten zwischen Status-Checks
         self.last_status_cache = {}  # Cache für letzten bekannten Status
         self.notification_cooldown = {}  # Verhindert Spam-Benachrichtigungen
+        self._lock = threading.Lock()  # Thread-Sicherheit
+        
+        # Windows-spezifische Signal-Handler registrieren
+        if os.name == 'nt':
+            signal.signal(signal.SIGINT, self._signal_handler)
+            signal.signal(signal.SIGTERM, self._signal_handler)
+        
+    def _signal_handler(self, signum, frame):
+        """Signal-Handler für ordnungsgemäßes Shutdown."""
+        queue_logger.warning(f"🛑 Signal {signum} empfangen - stoppe Queue Manager...")
+        self.stop()
         
     def start(self):
-        """Startet den Queue-Manager."""
+        """Startet den Queue-Manager mit verbessertem Thread-Management."""
-        if not self.is_running:
+        with self._lock:
-            self.is_running = True
+            if not self.is_running:
-            self.monitor_thread = threading.Thread(target=self._monitor_loop, daemon=True)
+                self.is_running = True
-            self.monitor_thread.start()
+                self.shutdown_event.clear()
-            queue_logger.info("✅ Printer Queue Manager erfolgreich gestartet")
+                self.monitor_thread = threading.Thread(target=self._monitor_loop, daemon=False)
-            
+                self.monitor_thread.start()
+                queue_logger.info("✅ Printer Queue Manager erfolgreich gestartet")
+                
     def stop(self):
-        """Stoppt den Queue-Manager."""
+        """Stoppt den Queue-Manager ordnungsgemäß."""
-        self.is_running = False
+        with self._lock:
-        if self.monitor_thread and self.monitor_thread.is_alive():
+            if self.is_running:
-            self.monitor_thread.join(timeout=5)
+                queue_logger.info("🔄 Beende Queue Manager...")
-        queue_logger.info("❌ Printer Queue Manager gestoppt")
+                self.is_running = False
+                self.shutdown_event.set()
+                
+                if self.monitor_thread and self.monitor_thread.is_alive():
+                    queue_logger.debug("⏳ Warte auf Thread-Beendigung...")
+                    self.monitor_thread.join(timeout=10)
+                    
+                    if self.monitor_thread.is_alive():
+                        queue_logger.warning("⚠️ Thread konnte nicht ordnungsgemäß beendet werden")
+                    else:
+                        queue_logger.info("✅ Monitor-Thread erfolgreich beendet")
+                
+                self.monitor_thread = None
+                queue_logger.info("❌ Printer Queue Manager gestoppt")
         
     def _monitor_loop(self):
-        """Hauptschleife für die Überwachung der Drucker."""
+        """Hauptschleife für die Überwachung der Drucker mit verbessertem Shutdown-Handling."""
         queue_logger.info(f"🔄 Queue-Überwachung gestartet (Intervall: {self.check_interval} Sekunden)")
         
-        while self.is_running:
+        while self.is_running and not self.shutdown_event.is_set():
             try:
                 self._check_waiting_jobs()
-                time.sleep(self.check_interval)
+                
+                # Verwende Event.wait() statt time.sleep() für unterbrechbares Warten
+                if self.shutdown_event.wait(timeout=self.check_interval):
+                    # Shutdown-Signal erhalten
+                    queue_logger.info("🛑 Shutdown-Signal empfangen - beende Monitor-Loop")
+                    break
+                    
             except Exception as e:
                 queue_logger.error(f"❌ Fehler in Monitor-Schleife: {str(e)}")
-                time.sleep(30)  # Kürzere Wartezeit bei Fehlern
+                # Kürzere Wartezeit bei Fehlern, aber auch unterbrechbar
+                if self.shutdown_event.wait(timeout=30):
+                    break
+                
+        queue_logger.info("🔚 Monitor-Loop beendet")
                 
     def _check_waiting_jobs(self):
         """Überprüft alle wartenden Jobs und aktiviert sie bei verfügbaren Druckern."""
+        if self.shutdown_event.is_set():
+            return
+            
         db_session = get_db_session()
         
         try:
@@ -119,6 +162,10 @@ class PrinterQueueManager:
             activated_jobs = []
             
             for job in waiting_jobs:
+                # Shutdown-Check zwischen Jobs
+                if self.shutdown_event.is_set():
+                    break
+                    
                 # Drucker-Status prüfen
                 printer = db_session.query(Printer).get(job.printer_id)
                 if not printer:
@@ -181,9 +228,10 @@ class PrinterQueueManager:
                 db_session.commit()
                 queue_logger.info(f"✅ {len(activated_jobs)} Jobs erfolgreich aktiviert")
                 
-                # Benachrichtigungen versenden
+                # Benachrichtigungen versenden (nur wenn nicht im Shutdown)
-                for item in activated_jobs:
+                if not self.shutdown_event.is_set():
-                    self._send_job_activation_notification(item["job"], item["printer"])
+                    for item in activated_jobs:
+                        self._send_job_activation_notification(item["job"], item["printer"])
             else:
                 # Auch offline-Status speichern
                 db_session.commit()
@@ -196,6 +244,9 @@ class PrinterQueueManager:
             
     def _send_job_activation_notification(self, job: Job, printer: Printer):
         """Sendet eine Benachrichtigung, wenn ein Job aktiviert wird."""
+        if self.shutdown_event.is_set():
+            return
+            
         try:
             # Cooldown prüfen (keine Spam-Benachrichtigungen)
             cooldown_key = f"job_{job.id}_activated"
@@ -284,16 +335,25 @@ class PrinterQueueManager:
             }
         finally:
             db_session.close()
+            
+    def is_healthy(self) -> bool:
+        """Prüft, ob der Queue Manager ordnungsgemäß läuft."""
+        return (self.is_running and 
+                self.monitor_thread is not None and 
+                self.monitor_thread.is_alive() and 
+                not self.shutdown_event.is_set())
 
 # Globale Instanz des Queue-Managers
 _queue_manager_instance = None
+_queue_manager_lock = threading.Lock()
 
 def get_queue_manager() -> PrinterQueueManager:
     """Gibt die globale Instanz des Queue-Managers zurück."""
     global _queue_manager_instance
-    if _queue_manager_instance is None:
+    with _queue_manager_lock:
-        _queue_manager_instance = PrinterQueueManager()
+        if _queue_manager_instance is None:
-    return _queue_manager_instance
+            _queue_manager_instance = PrinterQueueManager()
+        return _queue_manager_instance
 
 def start_queue_manager():
     """Startet den globalen Queue-Manager."""
@@ -304,6 +364,10 @@ def start_queue_manager():
 def stop_queue_manager():
     """Stoppt den globalen Queue-Manager."""
     global _queue_manager_instance
-    if _queue_manager_instance:
+    with _queue_manager_lock:
-        _queue_manager_instance.stop()
+        if _queue_manager_instance:
-        _queue_manager_instance = None 
+            _queue_manager_instance.stop()
+            _queue_manager_instance = None
+
+# Automatisches Cleanup bei Prozess-Ende registrieren
+atexit.register(stop_queue_manager) 

backend/app/utils/windows_fixes.py

@@ -0,0 +1,194 @@
+"""
+Windows-spezifische Fixes für Thread- und Socket-Probleme
+Behebt bekannte Issues mit Flask Auto-Reload auf Windows.
+"""
+
+import os
+import sys
+import signal
+import threading
+import time
+import atexit
+from typing import List, Callable
+from utils.logging_config import get_logger
+
+# Logger für Windows-Fixes
+windows_logger = get_logger("windows_fixes")
+
+class WindowsThreadManager:
+    """
+    Verwaltet Threads und deren ordnungsgemäße Beendigung auf Windows.
+    Behebt Socket-Fehler beim Flask Auto-Reload.
+    """
+    
+    def __init__(self):
+        self.managed_threads: List[threading.Thread] = []
+        self.cleanup_functions: List[Callable] = []
+        self.shutdown_event = threading.Event()
+        self._lock = threading.Lock()
+        self._is_shutting_down = False
+        
+        # Signal-Handler nur auf Windows registrieren
+        if os.name == 'nt':
+            self._register_signal_handlers()
+            
+    def _register_signal_handlers(self):
+        """Registriert Windows-spezifische Signal-Handler."""
+        try:
+            signal.signal(signal.SIGINT, self._signal_handler)
+            signal.signal(signal.SIGTERM, self._signal_handler)
+            # Windows-spezifisches SIGBREAK
+            if hasattr(signal, 'SIGBREAK'):
+                signal.signal(signal.SIGBREAK, self._signal_handler)
+            windows_logger.debug("✅ Windows Signal-Handler registriert")
+        except Exception as e:
+            windows_logger.warning(f"⚠️ Signal-Handler konnten nicht registriert werden: {str(e)}")
+            
+    def _signal_handler(self, sig, frame):
+        """Signal-Handler für ordnungsgemäßes Shutdown."""
+        if not self._is_shutting_down:
+            windows_logger.warning(f"🛑 Windows Signal {sig} empfangen - initiiere Shutdown")
+            self.shutdown_all()
+            
+    def register_thread(self, thread: threading.Thread):
+        """Registriert einen Thread für ordnungsgemäße Beendigung."""
+        with self._lock:
+            if thread not in self.managed_threads:
+                self.managed_threads.append(thread)
+                windows_logger.debug(f"📝 Thread {thread.name} registriert")
+                
+    def register_cleanup_function(self, func: Callable):
+        """Registriert eine Cleanup-Funktion."""
+        with self._lock:
+            if func not in self.cleanup_functions:
+                self.cleanup_functions.append(func)
+                windows_logger.debug(f"📝 Cleanup-Funktion registriert")
+                
+    def shutdown_all(self):
+        """Beendet alle verwalteten Threads und führt Cleanup durch."""
+        if self._is_shutting_down:
+            return
+            
+        with self._lock:
+            self._is_shutting_down = True
+            windows_logger.info("🔄 Starte Windows Thread-Shutdown...")
+            
+            # Shutdown-Event setzen
+            self.shutdown_event.set()
+            
+            # Cleanup-Funktionen ausführen
+            for func in self.cleanup_functions:
+                try:
+                    windows_logger.debug(f"🧹 Führe Cleanup-Funktion aus: {func.__name__}")
+                    func()
+                except Exception as e:
+                    windows_logger.error(f"❌ Fehler bei Cleanup-Funktion {func.__name__}: {str(e)}")
+            
+            # Threads beenden
+            active_threads = [t for t in self.managed_threads if t.is_alive()]
+            if active_threads:
+                windows_logger.info(f"⏳ Warte auf {len(active_threads)} aktive Threads...")
+                
+                for thread in active_threads:
+                    try:
+                        windows_logger.debug(f"🔄 Beende Thread: {thread.name}")
+                        thread.join(timeout=5)
+                        
+                        if thread.is_alive():
+                            windows_logger.warning(f"⚠️ Thread {thread.name} konnte nicht ordnungsgemäß beendet werden")
+                        else:
+                            windows_logger.debug(f"✅ Thread {thread.name} erfolgreich beendet")
+                    except Exception as e:
+                        windows_logger.error(f"❌ Fehler beim Beenden von Thread {thread.name}: {str(e)}")
+            
+            windows_logger.info("✅ Windows Thread-Shutdown abgeschlossen")
+
+# Globale Instanz
+_windows_thread_manager = None
+
+def get_windows_thread_manager() -> WindowsThreadManager:
+    """Gibt die globale Instanz des Windows Thread-Managers zurück."""
+    global _windows_thread_manager
+    if _windows_thread_manager is None:
+        _windows_thread_manager = WindowsThreadManager()
+    return _windows_thread_manager
+
+def fix_windows_socket_issues():
+    """
+    Anwendung von Windows-spezifischen Socket-Fixes.
+    Verhindert Socket-Fehler beim Flask Auto-Reload.
+    """
+    if os.name != 'nt':
+        return
+        
+    try:
+        # Socket-Wiederverwendung aktivieren
+        import socket
+        socket.socket._bind_orig = socket.socket.bind
+        
+        def patched_bind(self, address):
+            """Gepatchte bind-Methode mit SO_REUSEADDR."""
+            try:
+                self.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            except:
+                pass
+            return self._bind_orig(address)
+            
+        socket.socket.bind = patched_bind
+        windows_logger.debug("✅ Windows Socket-Patches angewendet")
+        
+    except Exception as e:
+        windows_logger.warning(f"⚠️ Socket-Patches konnten nicht angewendet werden: {str(e)}")
+
+def setup_windows_environment():
+    """
+    Richtet die Windows-Umgebung für bessere Flask-Kompatibilität ein.
+    """
+    if os.name != 'nt':
+        return
+        
+    try:
+        # Umgebungsvariablen für bessere Windows-Kompatibilität
+        os.environ['PYTHONIOENCODING'] = 'utf-8'
+        os.environ['PYTHONUTF8'] = '1'
+        
+        # Thread-Pool-Größe optimieren
+        if 'WERKZEUG_SERVER_FD' not in os.environ:
+            # Nur im Hauptprozess
+            os.environ['WERKZEUG_RUN_MAIN'] = 'true'
+            
+        windows_logger.debug("✅ Windows-Umgebung optimiert")
+        
+    except Exception as e:
+        windows_logger.warning(f"⚠️ Windows-Umgebung konnte nicht optimiert werden: {str(e)}")
+
+def is_flask_reloader_process() -> bool:
+    """
+    Prüft, ob der aktuelle Prozess der Flask-Reloader-Prozess ist.
+    """
+    return os.environ.get('WERKZEUG_RUN_MAIN') != 'true'
+
+def apply_all_windows_fixes():
+    """
+    Wendet alle Windows-spezifischen Fixes an.
+    """
+    if os.name != 'nt':
+        windows_logger.debug("⏭️ Keine Windows-Fixes nötig (nicht Windows)")
+        return
+        
+    windows_logger.info("🔧 Wende Windows-spezifische Fixes an...")
+    
+    setup_windows_environment()
+    fix_windows_socket_issues()
+    
+    # Thread-Manager initialisieren
+    thread_manager = get_windows_thread_manager()
+    
+    # Atexit-Handler registrieren
+    atexit.register(thread_manager.shutdown_all)
+    
+    windows_logger.info("✅ Alle Windows-Fixes erfolgreich angewendet")
+
+# Automatisch Windows-Fixes beim Import anwenden
+if os.name == 'nt':
+    apply_all_windows_fixes()