update scheduler

Co-authored-by: Copilot <copilot@github.com>

bus_terminal/lib/services/exceptions.dart

@@ -0,0 +1,9 @@
+/// Custom exception for authentication errors
+class UnauthorizedException implements Exception {
+  final String message;
+  
+  UnauthorizedException(this.message);
+  
+  @override
+  String toString() => message;
+}