btcpayserver/BTCPayServer.Data/Data/PaymentData.cs

using Microsoft.EntityFrameworkCore;

namespace BTCPayServer.Data
{
    public class PaymentData
    {
        public string Id { get; set; }
        public string InvoiceDataId { get; set; }
        public InvoiceData InvoiceData { get; set; }

        public byte[] Blob { get; set; }
        public bool Accounted { get; set; }


        internal static void OnModelCreating(ModelBuilder builder)
        {
            builder.Entity<PaymentData>()
                   .HasOne(o => o.InvoiceData)
                   .WithMany(i => i.Payments).OnDelete(DeleteBehavior.Cascade);
            builder.Entity<PaymentData>()
                   .HasIndex(o => o.InvoiceDataId);
        }
    }
}