Added createdAt attribute in dto classes and json schema

lib/data/dto/game.dart

@@ -5,11 +5,11 @@ import 'package:uuid/uuid.dart';
 
 class Game {
   final String id;
+  final DateTime createdAt;
   final String name;
   final List<Player>? players;
   final Group? group;
   final String? winner;
-  final DateTime createdAt;
 
   Game({
     String? id,
@@ -30,6 +30,7 @@ class Game {
   Game.fromJson(Map<String, dynamic> json)
     : id = json['id'],
       name = json['name'],
+      createdAt = DateTime.parse(json['createdAt']),
       players = json['players'] != null
           ? (json['players'] as List)
                 .map((playerJson) => Player.fromJson(playerJson))
@@ -41,6 +42,7 @@ class Game {
   /// Converts the Game instance to a JSON object.
   Map<String, dynamic> toJson() => {
     'id': id,
+    'createdAt': createdAt.toIso8601String(),
     'name': name,
     'players': players?.map((player) => player.toJson()).toList(),
     'group': group?.toJson(),

lib/data/dto/group.dart

@@ -4,9 +4,9 @@ import 'package:uuid/uuid.dart';
 
 class Group {
   final String id;
+  final DateTime createdAt;
   final String name;
   final List<Player> members;
-  final DateTime createdAt;
 
   Group({
     String? id,
@@ -24,6 +24,7 @@ class Group {
   /// Creates a Group instance from a JSON object.
   Group.fromJson(Map<String, dynamic> json)
     : id = json['id'],
+      createdAt = DateTime.parse(json['createdAt']),
       name = json['name'],
       members = (json['members'] as List)
           .map((memberJson) => Player.fromJson(memberJson))
@@ -32,6 +33,7 @@ class Group {
   /// Converts the Group instance to a JSON object.
   Map<String, dynamic> toJson() => {
     'id': id,
+    'createdAt': createdAt.toIso8601String(),
     'name': name,
     'members': members.map((member) => member.toJson()).toList(),
   };

lib/data/dto/player.dart

@@ -3,8 +3,8 @@ import 'package:uuid/uuid.dart';
 
 class Player {
   final String id;
-  final String name;
   final DateTime createdAt;
+  final String name;
 
   Player({String? id, DateTime? createdAt, required this.name})
     : id = id ?? const Uuid().v4(),
@@ -18,8 +18,13 @@ class Player {
   /// Creates a Player instance from a JSON object.
   Player.fromJson(Map<String, dynamic> json)
     : id = json['id'],
+      createdAt = DateTime.parse(json['createdAt']),
       name = json['name'];
 
   /// Converts the Player instance to a JSON object.
-  Map<String, dynamic> toJson() => {'id': id, 'name': name};
+  Map<String, dynamic> toJson() => {
+    'id': id,
+    'createdAt': createdAt.toIso8601String(),
+    'name': name,
+  };
 }