btcpayserver/BTCPayServer.Data/Data/AddressInvoiceData.cs

using System;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Internal;

namespace BTCPayServer.Data
{
    public class AddressInvoiceData
    {
        public string Address { get; set; }
        public InvoiceData InvoiceData { get; set; }
        public string InvoiceDataId { get; set; }
        public string PaymentMethodId { get; set; }


        internal static void OnModelCreating(ModelBuilder builder)
        {
            builder.Entity<AddressInvoiceData>()
                   .HasOne(o => o.InvoiceData)
                   .WithMany(i => i.AddressInvoices).OnDelete(DeleteBehavior.Cascade);
            builder.Entity<AddressInvoiceData>()
#pragma warning disable CS0618
                .HasKey(o => new { o.Address, o.PaymentMethodId });
#pragma warning restore CS0618
        }
    }
}