add deleted attribute

lib/data/models/team.dart

@@ -7,12 +7,14 @@ class Team {
   final String name;
   final DateTime createdAt;
   final List<Player> members;
+  final bool deleted;
 
   Team({
     String? id,
     required this.name,
     DateTime? createdAt,
     required this.members,
+    this.deleted = false,
   }) : id = id ?? const Uuid().v4(),
        createdAt = createdAt ?? clock.now();
 
@@ -27,7 +29,8 @@ class Team {
     : id = json['id'],
       name = json['name'],
       createdAt = DateTime.parse(json['createdAt']),
-      members = []; // Populated during import via DataTransferService
+      members = [],
+      deleted = json['deleted'] ?? false;
 
   /// Converts the Team instance to a JSON object. Related objects are
   /// represented by their IDs.
@@ -36,5 +39,6 @@ class Team {
     'name': name,
     'createdAt': createdAt.toIso8601String(),
     'memberIds': members.map((member) => member.id).toList(),
+    'deleted': deleted,
   };
 }