it prints

py_app/app/routes.py

@@ -1,17 +1,4 @@
 import json
-from flask import Blueprint
-bp = Blueprint('main', __name__)
-@bp.route('/get_pairing_keys')
-def get_pairing_keys():
-    """Return all pairing keys as JSON for client selection."""
-    keys_path = os.path.join(current_app.instance_path, 'pairing_keys.json')
-    try:
-        with open(keys_path, 'r') as f:
-            keys = json.load(f)
-    except Exception as e:
-        print(f"Error loading pairing keys: {e}")
-        return jsonify({'success': False, 'error': str(e), 'pairing_keys': []}), 500
-    return jsonify({'success': True, 'pairing_keys': keys})
 import os
 import mariadb
 from datetime import datetime, timedelta
@@ -61,6 +48,21 @@ def format_cell_data(cell):
 def store_articles():
     return render_template('store_articles.html')
 
+@bp.route('/get_pairing_keys')
+def get_pairing_keys():
+    """Return all pairing keys as JSON for client selection."""
+    keys_path = os.path.join(current_app.instance_path, 'pairing_keys.json')
+    try:
+        if os.path.exists(keys_path):
+            with open(keys_path, 'r') as f:
+                keys = json.load(f)
+        else:
+            keys = []
+    except Exception as e:
+        print(f"Error loading pairing keys: {e}")
+        return jsonify([]), 200
+    return jsonify(keys)
+
 @bp.route('/warehouse_reports')
 def warehouse_reports():
     return render_template('warehouse_reports.html')