fix(modal): add functionality to open edit modal for existing items based on URL parameters

deleted:    .scheduler_lock

Web/app.py

@@ -269,40 +269,6 @@ def _get_csrf_token():
 def _is_csrf_exempt_request():
     return request.method in {'GET', 'HEAD', 'OPTIONS', 'TRACE'}
 
-def _is_library_module_path(path):
-    """Return True when the current request path belongs to the library module."""
-    if not path:
-        return False
-
-    library_prefixes = (
-        '/library',
-        '/library_',
-        '/student_cards',
-    )
-    return path.startswith(library_prefixes)
-
-def _is_inventory_module_path(path):
-    """Return True when the current request path belongs to the inventory module."""
-    if not path:
-        return False
-        
-    if path == '/' or path.startswith('/home'):
-        return True
-
-    inventory_prefixes = (
-        '/scanner',
-        '/inventory',
-        '/upload_admin',
-        '/manage_filters',
-        '/manage_locations',
-        '/admin_borrowings',
-        '/admin_damaged_items',
-        '/admin/borrowings',
-        '/admin/damaged_items',
-        '/terminplan',
-    )
-    return path.startswith(inventory_prefixes)
-
 
 @app.before_request
 def _enforce_csrf_protection():
@@ -390,11 +356,14 @@ def _enforce_module_access():
     if endpoint == 'static' or endpoint.startswith('static') or request.path.startswith('/api/'):
         return None
     
-    if not cfg.LIBRARY_MODULE_ENABLED and _is_library_module_path(request.path):
-        return "Bibliotheks-Modul ist deaktiviert.", 403
-    
-    if not cfg.INVENTORY_MODULE_ENABLED and _is_inventory_module_path(request.path):
-        return "Inventar-Modul ist deaktiviert.", 403
+    for name, matcher in cfg.MODULES._path_matchers.items():
+        if matcher(request.path) and not cfg.MODULES.is_enabled(name):
+            msg = {
+                'library': "Bibliotheks-Modul ist deaktiviert.",
+                'inventory': "Inventar-Modul ist deaktiviert.",
+                'student_cards': "Schülerausweis-Modul ist deaktiviert."
+            }.get(name, f"{name.capitalize()}-Modul ist deaktiviert.")
+            return msg, 403
 
 """ -----------------------------------------------------------After Request Handlers----------------------------------------------------------------------------- """
 
@@ -440,24 +409,18 @@ def _csrf_error_response(message='CSRF token fehlt oder ist ungültig.'):
 
 def _get_current_module(path):
     """Resolve the active UI module for navbar separation."""
-    
-    if cfg.LIBRARY_MODULE_ENABLED and _is_library_module_path(path):
-        session['last_module'] = 'library'
-        return 'library'
-    if cfg.INVENTORY_MODULE_ENABLED and _is_inventory_module_path(path):
-        session['last_module'] = 'inventory'
-        return 'inventory'
+    mod = cfg.MODULES.get_module_for_path(path)
+    if mod:
+        session['last_module'] = mod
+        return mod
         
     last_module = session.get('last_module')
-    if last_module == 'library' and cfg.LIBRARY_MODULE_ENABLED:
-        return 'library'
-    if last_module == 'inventory' and cfg.INVENTORY_MODULE_ENABLED:
-        return 'inventory'
+    if last_module and cfg.MODULES.is_enabled(last_module):
+        return last_module
         
-    # Default fallback: prefer inventory if enabled, otherwise library, else inventory
-    if cfg.INVENTORY_MODULE_ENABLED:
+    if cfg.MODULES.is_enabled('inventory'):
         return 'inventory'
-    return 'library' if cfg.LIBRARY_MODULE_ENABLED else 'inventory'
+    return 'library' if cfg.MODULES.is_enabled('library') else 'inventory'
 
 """---------------------------------------------User Access Permissions----------------------------------------------------------------------------- """
 
@@ -1063,9 +1026,9 @@ def inject_version():
         'csrf_token': csrf_token,
         'CURRENT_MODULE': current_module,
         'school_periods': SCHOOL_PERIODS,
-        'inventory_module_enabled': cfg.INVENTORY_MODULE_ENABLED,
-        'library_module_enabled': cfg.LIBRARY_MODULE_ENABLED,
-        'student_cards_module_enabled': cfg.STUDENT_CARDS_MODULE_ENABLED,
+        'inventory_module_enabled': cfg.MODULES.is_enabled('inventory'),
+        'library_module_enabled': cfg.MODULES.is_enabled('library'),
+        'student_cards_module_enabled': cfg.MODULES.is_enabled('student_cards'),
         'is_admin': is_admin,
         'unread_notification_count': unread_notification_count,
         'current_permissions': current_permissions,
@@ -1641,6 +1604,20 @@ def _load_tabular_upload(uploaded_file):
     workbook.close()
     return header_row, data_rows
 
+def _deny_if_unauthenticated_file_access():
+    """Block file-serving routes unless a user is logged in."""
+    if 'username' not in session:
+        return Response('Forbidden', status=403)
+    return None
+
+
+def _student_card_id_slug(value):
+    """Build a compact identifier fragment from a name or class value."""
+    normalized = _normalize_excel_header(value)
+    if not normalized:
+        return ''
+    return re.sub(r'[^a-z0-9]+', '', normalized).upper()
+
 """-------------------------------------------------------------Filter----------------------------------------------------------------------------- """
 FILTER_SELECT_ALL_TOKEN = '__ALL__'
 
@@ -1701,36 +1678,10 @@ def _is_public_host(hostname):
         if ip_obj.is_private or ip_obj.is_loopback or ip_obj.is_link_local or ip_obj.is_multicast or ip_obj.is_reserved or ip_obj.is_unspecified:
             return False
         public_seen = True
-
+ 
     return public_seen
 
-
-def _deny_if_unauthenticated_file_access():
-    """Block file-serving routes unless a user is logged in."""
-    if 'username' not in session:
-        return Response('Forbidden', status=403)
-    return None
-
-
-def _student_card_id_slug(value):
-    """Build a compact identifier fragment from a name or class value."""
-    normalized = _normalize_excel_header(value)
-    if not normalized:
-        return ''
-    return re.sub(r'[^a-z0-9]+', '', normalized).upper()
-
-
-def _name_to_alias(full_name):
-    """Convert clear names to deterministic aliases, e.g. Simon Frings -> SimFri."""
-    text = sanitize_form_value(full_name)
-    if not text:
-        return 'User'
-
-    parts = [p for p in re.split(r'\s+', text) if p]
-    if len(parts) >= 2:
-        return us.build_name_synonym(parts[0], parts[-1])
-    return us.build_name_synonym(parts[0], '')
-
+"""-------------------------------------------------------------Student Cards Excel Import----------------------------------------------------------------------------- """
 
 def _build_student_card_excel_id(student_name, class_name, row_number, used_ids):
     """Create a stable student-card ID without embedding personal names."""
@@ -1762,7 +1713,7 @@ def _upload_student_cards_excel():
         flash('Administratorrechte erforderlich.', 'error')
         return redirect(url_for('home_admin'))
 
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         flash('Schülerausweis-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -1858,8 +1809,6 @@ def _upload_student_cards_excel():
                 student_name = f'{first_name} {last_name}'.strip()
                 validation_warnings.append((row_number, 'Schülername wurde aus Vorname und Nachname zusammengesetzt'))
 
-            student_name_alias = _name_to_alias(student_name)
-
             if not ausweis_id and not student_name and not class_name:
                 continue
 
@@ -1884,7 +1833,7 @@ def _upload_student_cards_excel():
             planned_rows.append({
                 'row_number': row_number,
                 'ausweis_id': ausweis_id,
-                'student_name': student_name_alias,
+                'student_name': student_name,
                 'class_name': class_name,
                 'notes': notes,
                 'default_borrow_days': default_borrow_days,
@@ -1959,7 +1908,7 @@ def _upload_excel_items(scope='inventory'):
     fallback_route = 'library_admin' if is_library_scope else 'upload_admin'
 
     if is_library_scope:
-        if not cfg.LIBRARY_MODULE_ENABLED:
+        if not cfg.MODULES.is_enabled('library'):
             flash('Bibliotheks-Modul ist deaktiviert.', 'error')
             return redirect(url_for('home'))
 
@@ -2290,6 +2239,7 @@ def upload_student_cards_excel():
     """Bulk import student cards from Excel."""
     return _upload_student_cards_excel()
 
+"""-------------------------------------------------------------File Serving-----------------------------------------------------------------------------"""
 
 @app.route('/uploads/<filename>')
 def uploaded_file(filename):
@@ -2581,27 +2531,11 @@ def catch_all_files(filename):
             os.path.join(BASE_DIR, 'static')
         ]
         
-        # Check development paths first
         for directory in possible_dirs:
             file_path = os.path.join(directory, filename)
             if os.path.isfile(file_path):
                 return send_from_directory(directory, os.path.basename(filename))
         
-        # Check production paths if available
-        if os.path.exists("/var/Inventarsystem/Web"):
-            prod_dirs = [
-                "/var/Inventarsystem/Web/uploads",
-                "/var/Inventarsystem/Web/thumbnails",
-                "/var/Inventarsystem/Web/previews",
-                # "/var/Inventarsystem/Web/QRCodes",  # QR Code serving deactivated
-                "/var/Inventarsystem/Web/static"
-            ]
-            
-            for directory in prod_dirs:
-                file_path = os.path.join(directory, filename)
-                if os.path.isfile(file_path):
-                    return send_from_directory(directory, os.path.basename(filename))
-        
         # Check if this looks like an image request
         if any(filename.lower().endswith(ext) for ext in ['png', 'jpg', 'jpeg', 'gif', 'svg']):
             # Use a placeholder image if file not found - first try SVG, then PNG
@@ -2621,6 +2555,7 @@ def catch_all_files(filename):
         print(f"Error in catch-all route for {filename}: {str(e)}")
         return Response(f"Error serving file: {str(e)}", status=500)
 
+"""-------------------------------------------------------------Main Views-----------------------------------------------------------------------------"""
 
 @app.route('/test_connection', methods=['GET'])
 def test_connection():
@@ -2671,8 +2606,8 @@ def home():
         flash('Bitte mit registriertem Konto anmelden!', 'error')
         return redirect(url_for('login'))
         
-    if not cfg.INVENTORY_MODULE_ENABLED:
-        if cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('inventory'):
+        if cfg.MODULES.is_enabled('library'):
             return redirect(url_for('library_view'))
         else:
             return "Weder Inventar- noch Bibliotheks-Modul sind aktiviert.", 403
@@ -2681,8 +2616,8 @@ def home():
         return render_template(
             'main.html',
             username=session['username'],
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
             student_default_borrow_days=cfg.STUDENT_DEFAULT_BORROW_DAYS,
             student_max_borrow_days=cfg.STUDENT_MAX_BORROW_DAYS
         )
@@ -2710,8 +2645,8 @@ def home_admin():
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
         
-    if not cfg.INVENTORY_MODULE_ENABLED:
-        if cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('inventory'):
+        if cfg.MODULES.is_enabled('library'):
             return redirect(url_for('library_admin'))
         else:
             return "Weder Inventar- noch Bibliotheks-Modul sind aktiviert.", 403
@@ -2722,8 +2657,8 @@ def home_admin():
     return render_template(
         'main_admin.html',
         username=session['username'],
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         student_default_borrow_days=cfg.STUDENT_DEFAULT_BORROW_DAYS,
         student_max_borrow_days=cfg.STUDENT_MAX_BORROW_DAYS,
         school_info=_get_school_info_for_export(),
@@ -2741,8 +2676,8 @@ def tutorial_page():
         'tutorial.html',
         username=session['username'],
         is_admin=us.check_admin(session['username']),
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         student_default_borrow_days=cfg.STUDENT_DEFAULT_BORROW_DAYS,
         student_max_borrow_days=cfg.STUDENT_MAX_BORROW_DAYS
     )
@@ -2760,16 +2695,16 @@ def library_view():
     if 'username' not in session:
         flash('Bitte mit registriertem Konto anmelden!', 'error')
         return redirect(url_for('login'))
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         flash('Bibliotheks-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home'))
     
     return render_template(
         'library_table.html',
         username=session['username'],
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
         is_admin=us.check_admin(session['username']),
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         student_default_borrow_days=cfg.STUDENT_DEFAULT_BORROW_DAYS,
         student_max_borrow_days=cfg.STUDENT_MAX_BORROW_DAYS
     )
@@ -2784,7 +2719,7 @@ def library_loans_admin():
     if not us.check_admin(session['username']):
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         flash('Bibliotheks-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -2885,8 +2820,8 @@ def library_loans_admin():
             'library_borrowings_admin.html',
             loan_entries=loan_entries,
             damaged_items=damaged_items,
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         )
     except Exception as e:
         app.logger.error(f"Error loading library loans admin view: {e}")
@@ -3021,9 +2956,9 @@ def api_library_scan_action():
     """
     if 'username' not in session:
         return jsonify({'ok': False, 'message': 'Nicht angemeldet.'}), 401
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         return jsonify({'ok': False, 'message': 'Bibliotheks-Modul ist deaktiviert.'}), 403
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         return jsonify({'ok': False, 'message': 'Schülerausweis-Modul ist deaktiviert.'}), 403
 
     payload = request.get_json(silent=True) or {}
@@ -3227,7 +3162,7 @@ def api_library_item_update(item_id):
         return jsonify({'ok': False, 'message': 'Nicht angemeldet.'}), 401
     if not us.check_admin(session['username']):
         return jsonify({'ok': False, 'message': 'Administratorrechte erforderlich.'}), 403
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         return jsonify({'ok': False, 'message': 'Bibliotheks-Modul ist deaktiviert.'}), 403
 
     payload = request.get_json(silent=True) or {}
@@ -3358,8 +3293,8 @@ def upload_admin():
         'upload_admin.html',
         username=session['username'],
         duplicate_data=duplicate_data,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         show_library_features=False,
         upload_mode='item',
         page_title='Artikel hochladen',
@@ -3380,7 +3315,7 @@ def library_admin():
     if not _action_access_allowed(permissions, 'can_insert'):
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         flash('Bibliotheks-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -3424,8 +3359,8 @@ def library_admin():
         'upload_admin.html',
         username=session['username'],
         duplicate_data=duplicate_data,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         show_library_features=True,
         upload_mode='library',
         page_title='Bücher hochladen',
@@ -3445,7 +3380,7 @@ def student_cards_admin():
     if not us.check_admin(session['username']):
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         flash('Schülerausweis-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -3481,7 +3416,7 @@ def student_cards_admin():
         action = request.form.get('action', 'add')
         ausweis_id = request.form.get('ausweis_id', '').strip().upper()
         student_name = request.form.get('student_name', '').strip()
-        student_name_alias = _name_to_alias(student_name)
+        student_name_alias = student_name 
         default_borrow_days = request.form.get('default_borrow_days', 14)
         class_name = request.form.get('class_name', '').strip()
         notes = request.form.get('notes', '').strip()
@@ -3571,8 +3506,8 @@ def student_cards_admin():
         edit_mode=edit_mode,
         form_data=form_data,
         config={'default': cfg.STUDENT_DEFAULT_BORROW_DAYS},
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards')
     )
 
 
@@ -3588,7 +3523,7 @@ def student_cards_print():
     if not us.check_admin(session['username']):
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         flash('Schülerausweis-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -3620,7 +3555,7 @@ def student_card_barcode_print():
     if not us.check_admin(session['username']):
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         flash('Schülerausweis-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -3651,7 +3586,7 @@ def student_card_barcode_download():
     if not us.check_admin(session['username']):
         flash('Zugriff verweigert.', 'error')
         return redirect(url_for('login'))
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         flash('Schülerausweis-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -3825,7 +3760,7 @@ def student_card_single_barcode_download(card_id):
     if not us.check_admin(session['username']):
         flash('Zugriff verweigert.', 'error')
         return redirect(url_for('login'))
-    if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('student_cards'):
         flash('Schülerausweis-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -4694,7 +4629,7 @@ def upload_item():
 
     item_isbn = ''
     item_type = 'general'
-    if cfg.LIBRARY_MODULE_ENABLED:
+    if cfg.MODULES.is_enabled('library'):
         item_isbn = normalize_and_validate_isbn(isbn_raw)
         if isbn_raw and not item_isbn:
             error_msg = 'Ungültige ISBN. Bitte ISBN-10 oder ISBN-13 verwenden.'
@@ -4706,7 +4641,7 @@ def upload_item():
             item_type = 'book'
 
     if upload_mode == 'library':
-        if not cfg.LIBRARY_MODULE_ENABLED:
+        if not cfg.MODULES.is_enabled('library'):
             error_msg = 'Bibliotheks-Modul ist deaktiviert.'
             if is_mobile:
                 return jsonify({'success': False, 'message': error_msg}), 400
@@ -4736,6 +4671,10 @@ def upload_item():
         if is_mobile:
             return jsonify({'success': False, 'message': error_msg}), 400
         else:
+            conflicting_items = it.get_item_by_code_4(code_4[0])
+            if conflicting_items:
+                flash('Der Code wird bereits verwendet. Das existierende Element wurde geöffnet.', 'info')
+                return redirect(url_for(success_redirect_endpoint, open_item_modal=str(conflicting_items[0]['_id'])))
             flash(error_msg, 'error')
             return redirect(url_for(success_redirect_endpoint))
 
@@ -4760,6 +4699,10 @@ def upload_item():
                 error_msg = f'Der Einzelcode "{specific_code}" wird bereits verwendet.'
                 if is_mobile:
                     return jsonify({'success': False, 'message': error_msg}), 400
+                conflicting_items = it.get_item_by_code_4(specific_code)
+                if conflicting_items:
+                    flash(f'Der Einzelcode "{specific_code}" wird bereits verwendet. Das existierende Element wurde geöffnet.', 'info')
+                    return redirect(url_for(success_redirect_endpoint, open_item_modal=str(conflicting_items[0]['_id'])))
                 flash(error_msg, 'error')
                 return redirect(url_for(success_redirect_endpoint))
 
@@ -5881,7 +5824,7 @@ def edit_item(id):
 
     item_isbn = ''
     item_type = 'general'
-    if cfg.LIBRARY_MODULE_ENABLED:
+    if cfg.MODULES.is_enabled('library'):
         item_isbn = normalize_and_validate_isbn(isbn_raw)
         if isbn_raw and not item_isbn:
             flash('Ungültige ISBN. Bitte ISBN-10 oder ISBN-13 verwenden.', 'error')
@@ -5891,6 +5834,10 @@ def edit_item(id):
     
     # Check if code is unique (excluding the current item)
     if code_4 and not it.is_code_unique(code_4, exclude_id=id):
+        conflicting_items = it.get_item_by_code_4(code_4)
+        if conflicting_items:
+            flash('Der Code wird bereits verwendet. Das existierende Element wurde stattdessen geöffnet.', 'info')
+            return redirect(url_for('home_admin', open_item_modal=str(conflicting_items[0]['_id'])))
         flash('Der Code wird bereits verwendet. Bitte wählen Sie einen anderen Code.', 'error')
         return redirect(url_for('home_admin'))
     
@@ -6164,7 +6111,7 @@ def ausleihen(id):
     
     username = session['username']
     requested_return_to = (request.form.get('return_to') or '').strip().lower()
-    if requested_return_to == 'library' and cfg.LIBRARY_MODULE_ENABLED:
+    if requested_return_to == 'library' and cfg.MODULES.is_enabled('library'):
         redirect_target = 'library_view'
     else:
         redirect_target = 'home_admin' if us.check_admin(username) else 'home'
@@ -6182,7 +6129,7 @@ def ausleihen(id):
 
     # Library media can only be borrowed with a valid student card.
     if is_library_item:
-        if not cfg.STUDENT_CARDS_MODULE_ENABLED:
+        if not cfg.MODULES.is_enabled('student_cards'):
             flash('Bibliotheksmedien können nur mit aktivem Schülerausweis-Modul ausgeliehen werden.', 'error')
             return redirect(url_for(redirect_target))
         if not student_card_id:
@@ -6211,7 +6158,7 @@ def ausleihen(id):
             if client:
                 client.close()
 
-    if cfg.STUDENT_CARDS_MODULE_ENABLED:
+    if cfg.MODULES.is_enabled('student_cards'):
         duration_raw = (request.form.get('borrow_duration_days') or '').strip()
         if duration_raw:
             try:
@@ -7131,8 +7078,8 @@ def register():
             return redirect(url_for('home'))
         return render_template(
             'register.html',
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
             student_default_borrow_days=cfg.STUDENT_DEFAULT_BORROW_DAYS,
             student_max_borrow_days=cfg.STUDENT_MAX_BORROW_DAYS
         )
@@ -7198,8 +7145,8 @@ def user_del():
     return render_template(
         'user_del.html',
         users=users_list,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards')
     )
 
 
@@ -7339,8 +7286,8 @@ def admin_borrowings():
     return render_template(
         'admin_borrowings.html',
         entries=entries,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards')
     )
 
 """-----------------------------------------------------------Audit Routes-------------------------------------------------------"""
@@ -7401,8 +7348,8 @@ def admin_audit_dashboard():
             'admin_audit.html',
             verify_result=verify_result,
             audit_rows=audit_rows,
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         )
     except Exception as exc:
         app.logger.error(f"Error loading audit dashboard: {exc}")
@@ -8148,7 +8095,7 @@ def library_item_invoices(item_id):
     if 'username' not in session or not us.check_admin(session['username']):
         flash('Ihnen ist es nicht gestattet auf dieser Internetanwendung, die eben besuchte Adrrese zu nutzen, versuchen sie es erneut nach dem sie sich mit einem berechtigten Nutzer angemeldet haben!', 'error')
         return redirect(url_for('login'))
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         flash('Bibliotheks-Modul ist deaktiviert.', 'error')
         return redirect(url_for('home_admin'))
 
@@ -8216,8 +8163,8 @@ def library_item_invoices(item_id):
                 'isbn': item_doc.get('ISBN', ''),
             },
             invoices=entries,
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         )
     except Exception as e:
         app.logger.error(f"Error loading invoice history for item {item_id}: {e}")
@@ -8365,13 +8312,12 @@ def admin_anonymize_names():
 
         for card_doc in student_cards_col.find({}, {'SchülerName': 1, 'Klasse': 1, 'Notizen': 1}):
             decrypted = _decrypt_student_card_doc(card_doc)
-            alias = _name_to_alias(decrypted.get('SchülerName', ''))
             class_name = sanitize_form_value(decrypted.get('Klasse', ''))
             notes = sanitize_form_value(decrypted.get('Notizen', ''))
 
             encrypted_payload = encrypt_document_fields(
                 {
-                    'SchülerName': alias,
+                    'SchülerName': decrypted.get('SchülerName', ''),
                     'Klasse': class_name,
                     'Notizen': notes,
                 },
@@ -8544,8 +8490,8 @@ def logs():
     return render_template(
         'logs.html',
         items=formatted_items,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards')
     )
 
 
@@ -8610,8 +8556,8 @@ def manage_filters():
         'manage_filters.html',
         filter1_values=filter1_values,
         filter2_values=filter2_values,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards')
     )
 
 @app.route('/add_filter_value/<int:filter_num>', methods=['POST'])
@@ -8742,7 +8688,7 @@ def fetch_book_info(isbn):
     if 'username' not in session or not us.check_admin(session['username']):
         return jsonify({"error": "Not authorized"}), 403
 
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         return jsonify({"error": "Bibliotheks-Modul ist deaktiviert."}), 403
 
     try:
@@ -8837,7 +8783,7 @@ def download_book_cover():
         return jsonify({"error": "Not authorized"}), 403
     if not us.check_admin(session['username']):
         return jsonify({"error": "Admin privileges required"}), 403
-    if not cfg.LIBRARY_MODULE_ENABLED:
+    if not cfg.MODULES.is_enabled('library'):
         return jsonify({"error": "Bibliotheks-Modul ist deaktiviert."}), 403
     
     try:
@@ -9204,8 +9150,8 @@ def notifications_view():
             user_notifications=user_notifications,
             admin_notifications=admin_notifications,
             is_admin_user=is_admin_user,
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         )
     except Exception as exc:
         app.logger.error(f"Error loading notifications: {exc}")
@@ -9436,8 +9382,8 @@ def admin_damaged_items():
         return render_template(
             'admin_damaged_items.html',
             damaged_items=damaged_rows,
-            library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-            student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+            library_module_enabled=cfg.MODULES.is_enabled('library'),
+            student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
         )
     except Exception as exc:
         app.logger.error(f"Error loading damaged-items admin view: {exc}")
@@ -9540,8 +9486,8 @@ def manage_locations():
     return render_template(
         'manage_locations.html',
         location_values=location_values,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards')
     )
 
 
@@ -9649,8 +9595,8 @@ def admin_school_settings():
         school_info=current_school,
         tenant_id=tenant_id,
         tenant_db=tenant_db,
-        library_module_enabled=cfg.LIBRARY_MODULE_ENABLED,
-        student_cards_module_enabled=cfg.STUDENT_CARDS_MODULE_ENABLED,
+        library_module_enabled=cfg.MODULES.is_enabled('library'),
+        student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
     )
 
 @app.route('/check_code_unique/<code>')

Web/module_registry.py

@@ -0,0 +1,26 @@
+from typing import Dict, Any
+
+class ModuleRegistry:
+    def __init__(self):
+        self._modules: Dict[str, Any] = {}
+        self._path_matchers = {}
+
+    def register(self, name: str, settings_bool, path_matcher=lambda path: False):
+        self._modules[name] = settings_bool
+        self._path_matchers[name] = path_matcher
+
+    def is_enabled(self, name: str) -> bool:
+        if name not in self._modules:
+            return False
+        return bool(self._modules[name])
+
+    def get_all_status(self) -> Dict[str, bool]:
+        return {name: bool(sys_bool) for name, sys_bool in self._modules.items()}
+
+    def get_module_for_path(self, path: str) -> str:
+        for name, matcher in self._path_matchers.items():
+            if self.is_enabled(name) and matcher(path):
+                return name
+        return None
+
+registry = ModuleRegistry()

Web/settings.py

@@ -205,11 +205,32 @@ class _TenantAwareBool:
         return f"_TenantAwareBool(module_name={self.module_name!r}, value={self.resolve()!r})"
 
 
+from module_registry import registry as MODULES
+
 INVENTORY_MODULE_ENABLED = _TenantAwareBool('inventory', _get(_conf, ['modules', 'inventory', 'enabled'], DEFAULTS['modules']['inventory']['enabled']))
 LIBRARY_MODULE_ENABLED = _TenantAwareBool('library', _get(_conf, ['modules', 'library', 'enabled'], DEFAULTS['modules']['library']['enabled']))
 STUDENT_CARDS_MODULE_ENABLED = _TenantAwareBool('student_cards', _get(_conf, ['modules', 'student_cards', 'enabled'], DEFAULTS['modules']['student_cards']['enabled']))
+
+def _match_inventory(path):
+    if not path: return False
+    if path == '/' or path.startswith('/home'): return True
+    return path.startswith(('/scanner', '/inventory', '/upload_admin', '/manage_filters', '/manage_locations', '/admin_borrowings', '/admin_damaged_items', '/admin/borrowings', '/admin/damaged_items', '/terminplan'))
+
+def _match_library(path):
+    if not path: return False
+    return path.startswith(('/library', '/library_', '/student_cards'))
+
+def _match_student_cards(path):
+    if not path: return False
+    return path.startswith(('/student_cards'))
+
+# Register core modules into the pipeline
+MODULES.register('inventory', INVENTORY_MODULE_ENABLED, _match_inventory)
+MODULES.register('library', LIBRARY_MODULE_ENABLED, _match_library)
+MODULES.register('student_cards', STUDENT_CARDS_MODULE_ENABLED, _match_student_cards)
+
 STUDENT_DEFAULT_BORROW_DAYS = int(_get(_conf, ['modules', 'student_cards', 'default_borrow_days'], DEFAULTS['modules']['student_cards']['default_borrow_days']))
-STUDENT_MAX_BORROW_DAYS = int(_get(_conf, ['modules', 'student_cards', 'max_borrow_days'], DEFAULTS['modules']['student_cards']['max_borrow_days']))
+STUDENT_MAX_BORROW_DAYS = int(_get(_conf, ["modules", "student_cards", "max_borrow_days"], DEFAULTS["modules"]["student_cards"]["max_borrow_days"]))
 
 # Upload/paths
 ALLOWED_EXTENSIONS = set(_get(_conf, ['allowed_extensions'], DEFAULTS['upload']['allowed_extensions']))

Web/templates/main.html

@@ -459,7 +459,7 @@
     <div id="schedule-modal" class="item-modal">
         <div class="modal-content">
             <span class="close-modal" onclick="closeScheduleModal()">&times;</span>
-            <h2>Termin planen</h2>
+            <h2>Reservieren</h2>
             <form id="schedule-form">
                 <input type="hidden" id="schedule-item-id" name="item_id">
 
@@ -1057,7 +1057,7 @@
                                 :
                                     `<button class="ausleihen disabled-button" disabled>${item.BlockedNow ? 'Reserviert' : 'Ausgeliehen'}</button>`
                                 }
-                                ${canScheduleItem ? `<button class="schedule-button" type="button" onclick="openScheduleModal('${item._id}')">Termin planen</button>` : ''}
+                                ${canScheduleItem ? `<button class="schedule-button" type="button" onclick="openScheduleModal('${item._id}')">Reservieren</button>` : ''}
                                 <button class="quick-details-button" type="button" onclick="openItemQuick('${item._id}')">Details</button>
                             </div>
                         `;
@@ -1734,7 +1734,7 @@
                     </form>`
                     : `<button class="ausleihen disabled-button" disabled>${item.BlockedNow ? 'Reserviert' : 'Ausgeliehen'}</button>`
                 }
-                ${canScheduleItem ? `<button class="schedule-button" onclick="openScheduleModal('${item._id}')">Termin planen</button>` : ''}
+                ${canScheduleItem ? `<button class="schedule-button" onclick="openScheduleModal('${item._id}')">Reservieren</button>` : ''}
                 <button type="button" class="details-button" onclick="document.getElementById('item-modal').style.display='none';">Schließen</button>
             </div>
         `;

Web/templates/main_admin.html

@@ -2643,7 +2643,7 @@ document.addEventListener('DOMContentLoaded', ()=>{
 <div id="schedule-modal" class="item-modal">
     <div class="modal-content">
         <span class="close-modal" onclick="closeScheduleModal()">&times;</span>
-        <h2>Termin planen</h2>
+        <h2>Reservieren</h2>
         <form id="schedule-form">
             <input type="hidden" id="schedule-item-id" name="item_id">
             <div class="form-group" id="schedule-specific-item-group" style="display:none;">
@@ -3252,6 +3252,12 @@ document.addEventListener('DOMContentLoaded', ()=>{
     }
 
     document.addEventListener('DOMContentLoaded', function() {
+        const urlParams = new URLSearchParams(window.location.search);
+        const openItem = urlParams.get('open_item_modal');
+        if (openItem) {
+            openEditModalFromServer(openItem);
+        }
+
         // Load saved filters
         loadFilterState();
         
@@ -3654,7 +3660,7 @@ document.addEventListener('DOMContentLoaded', ()=>{
                                 </form>
                                 <button class="edit-button" onclick="openEditModalForSelectedUnit('${item._id}', 'specific-item-card-${item._id}')">Bearbeiten</button>
                                 <button class="duplicate-button" onclick="duplicateItem('${item._id}')">Duplizieren</button>
-                                ${canScheduleItem ? `<button class="schedule-button" onclick="openScheduleModal('${item._id}')">Termin planen</button>` : ''}
+                                ${canScheduleItem ? `<button class="schedule-button" onclick="openScheduleModal('${item._id}')">Reservieren</button>` : ''}
                             </div>
                         `;
                         itemsContainer.appendChild(card);
@@ -4531,7 +4537,7 @@ document.addEventListener('DOMContentLoaded', ()=>{
                 <button class="edit-button" onclick="openEditModalForSelectedUnit('${item._id}', 'specific-item-modal-${item._id}')">Bearbeiten</button>
                 <button class="duplicate-button" onclick="duplicateItem('${item._id}')">Duplizieren</button>
                 ${damageReports.length > 0 ? `<button class="damage-button" onclick="markDamageAsRepaired('${item._id}')">Repariert</button>` : `<button class="damage-button" onclick="registerDamage('${item._id}')">Schaden melden</button>`}
-                ${canScheduleItem ? `<button class="schedule-button" onclick="openScheduleModal('${item._id}')">Termin planen</button>` : ''}
+                ${canScheduleItem ? `<button class="schedule-button" onclick="openScheduleModal('${item._id}')">Reservieren</button>` : ''}
                 <form method="POST" action="/delete_item/${item._id}" style="display:inline;" onsubmit="return confirm('Sind Sie sicher?')">
                     <button class="delete-button" type="submit">Löschen</button>
                 </form>

Web/tenant.py

@@ -96,6 +96,10 @@ def get_tenant_config(tenant_id=None):
 
     if tenant_id in TENANT_REGISTRY:
         return TENANT_REGISTRY[tenant_id] or {}
+        
+    for alias in _tenant_db_aliases(tenant_id):
+        if alias in TENANT_REGISTRY:
+            return TENANT_REGISTRY[alias] or {}
 
     return TENANT_REGISTRY.get('default', {}) or {}