Potential fix for code scanning alert no. 14: Information exposure through an exception

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: tobiemh

examples/flask/routes/auth.py

@@ -35,7 +35,8 @@ def signup():
         }), 201
 
     except Exception as e:
-        return jsonify({"error": f"Signup failed: {str(e)}"}), 400
+        logger.error("Exception in signup: %s\n%s", str(e), traceback.format_exc())
+        return jsonify({"error": "Signup failed. Please try again later."}), 400
 
 
 @bp.route("/signin", methods=["POST"])