export interface IBalance { id: string; userId: string; amount: number; currency: string; createdAt: Date; updatedAt: Date; } export interface IBalanceCreate { userId: string; amount: number; currency: string; } export interface IBalanceUpdate { amount?: number; currency?: string; } export interface IBalanceResponse { id: string; userId: string; amount: number; currency: string; createdAt: Date; updatedAt: Date; }