😋 初始化仓库

lib/models/evaluation_history.dart

@@ -0,0 +1,54 @@
+import 'course.dart';
+
+/// Evaluation history record
+class EvaluationHistory {
+  final String id;
+  final Course course;
+  final DateTime timestamp;
+  final bool success;
+  final String? errorMessage;
+
+  EvaluationHistory({
+    required this.id,
+    required this.course,
+    required this.timestamp,
+    required this.success,
+    this.errorMessage,
+  });
+
+  factory EvaluationHistory.fromJson(Map<String, dynamic> json) {
+    return EvaluationHistory(
+      id: json['id'] as String? ?? '',
+      course: Course.fromJson(json['course'] as Map<String, dynamic>),
+      timestamp: json['timestamp'] != null
+          ? DateTime.parse(json['timestamp'] as String)
+          : DateTime.now(),
+      success: json['success'] as bool? ?? false,
+      errorMessage: json['errorMessage'] as String?,
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'course': course.toJson(),
+      'timestamp': timestamp.toIso8601String(),
+      'success': success,
+      'errorMessage': errorMessage,
+    };
+  }
+
+  @override
+  String toString() {
+    return 'EvaluationHistory(id: $id, course: ${course.name}, success: $success, timestamp: $timestamp)';
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    return other is EvaluationHistory && other.id == id;
+  }
+
+  @override
+  int get hashCode => id.hashCode;
+}