namespace Purrse.Core.Models; public class InvestmentHolding { public Guid Id { get; set; } public Guid AccountId { get; set; } public Guid SecurityId { get; set; } public decimal Shares { get; set; } public decimal CostBasis { get; set; } public DateTime AsOfDate { get; set; } public Account Account { get; set; } = null!; public Security Security { get; set; } = null!; }