/// 账单创建/更新请求体
class BillRequest {
  final int categoryId;
  final double amount;
  final String description;
  final String billDate; // yyyy-MM-dd
  final int type; // 1=支出，2=收入

  const BillRequest({
    required this.categoryId,
    required this.amount,
    this.description = '',
    required this.billDate,
    required this.type,
  });

  Map<String, dynamic> toJson() => {
        'categoryId': categoryId,
        'amount': amount,
        'description': description,
        'billDate': billDate,
        'type': type,
      };
}