class Conversation { final int id; final String title; final DateTime createdAt; final DateTime updatedAt; const Conversation({ required this.id, required this.title, required this.createdAt, required this.updatedAt, }); factory Conversation.fromJson(Map json) => Conversation( id: json['id'] as int, title: json['title'] as String, createdAt: DateTime.parse(json['created_at'] as String), updatedAt: DateTime.parse(json['updated_at'] as String), ); }