Interface AdminVolumeDiscount

interface AdminVolumeDiscount {
    id: number;
    name: string;
    description: string;
    products: number[];
    categories: number[];
    is_active: boolean;
    valid_from: string;
    valid_until: string | null;
    tiers: VolumeDiscountTier[];
    is_valid: boolean;
    created_at: string;
    updated_at: string;
}