add event update panel

lib/services/dataService.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:convert';
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/scheduler.dart';
@@ -441,6 +442,30 @@ class DataService extends ChangeNotifier {
     return _locoClasses;
   }
 
+  Future<void> createLocoEvent({
+    required int locoId,
+    required String eventDate,
+    required Map<String, dynamic> values,
+    required String details,
+    String eventType = 'other',
+  }) async {
+    try {
+      await api.put(
+        '/event/new',
+        {
+          'loco_id': locoId,
+          'loco_event_type': eventType,
+          'loco_event_date': eventDate,
+          'loco_event_value': jsonEncode(values),
+          'loco_event_details': details,
+        },
+      );
+    } catch (e) {
+      debugPrint('Failed to create loco event: $e');
+      rethrow;
+    }
+  }
+
   void clear() {
     _homepageStats = null;
     _legs = [];