[Table("Product")]
public class Product : EntityBase
{
    [Key]
    public int Id { get; set; }

    public virtual ICollection<Argument> Arguments { get; set; }
    public virtual ICollection<Product> AdditionalProducts { get; set; }
}

public partial class test1 : DbMigration
{
    public override void Up()
    {
        AddColumn("dbo.Product", "Product_Id", c => c.Int());
        CreateIndex("dbo.Product", "Product_Id");
        AddForeignKey("dbo.Product", "Product_Id", "dbo.Product", "Id");
    }

    public override void Down()
    {
        DropForeignKey("dbo.Product", "Product_Id", "dbo.Product");
        DropIndex("dbo.Product", new[] { "Product_Id" });
        DropColumn("dbo.Product", "Product_Id");
    }
}