rdt-client/server/RdtClient.Data/Data/DataContext.cs

using System.Linq;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using RdtClient.Data.Models.Data;

namespace RdtClient.Data.Data
{
    public class DataContext : IdentityDbContext
    {
        public DataContext(DbContextOptions options) : base(options)
        {
        }

        public DbSet<Download> Downloads { get; set; }
        public DbSet<Setting> Settings { get; set; }
        public DbSet<Torrent> Torrents { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder options)
        {
            
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
            
            var cascadeFKs = builder.Model.GetEntityTypes()
                                    .SelectMany(t => t.GetForeignKeys())
                                    .Where(fk => !fk.IsOwnership && fk.DeleteBehavior == DeleteBehavior.Cascade);

            foreach (var fk in cascadeFKs)
            {
                fk.DeleteBehavior = DeleteBehavior.Restrict;
            }
        }
    }
}