VERSAO FINAL (core features)

lib/core/models/class_stats.dart

@@ -13,6 +13,7 @@ class ClassStats {
   final int totalContent;
   final List<WeeklyStats> weeklyStats;
   final List<StudentNeedingSupport> studentsNeedingSupport;
+  final DateTime? lastUpdated;
 
   const ClassStats({
     required this.classId,
@@ -26,6 +27,7 @@ class ClassStats {
     required this.totalContent,
     required this.weeklyStats,
     required this.studentsNeedingSupport,
+    this.lastUpdated,
   });
 
   factory ClassStats.fromFirestore(Map<String, dynamic> data, String classId) {
@@ -47,6 +49,7 @@ class ClassStats {
               ?.map((s) => StudentNeedingSupport.fromFirestore(s))
               .toList() ??
           [],
+      lastUpdated: (data['lastUpdated'] as Timestamp?)?.toDate(),
     );
   }
 
@@ -62,6 +65,7 @@ class ClassStats {
       'totalContent': totalContent,
       'weeklyStats': weeklyStats.map((w) => w.toFirestore()).toList(),
       'studentsNeedingSupport': studentsNeedingSupport.map((s) => s.toFirestore()).toList(),
+      'lastUpdated': lastUpdated != null ? Timestamp.fromDate(lastUpdated!) : null,
     };
   }
 }