Add modifications to your model when using EF Core DB First Design

My team uses Db first design. We create the database, then create the model using the Scaffold-DbContext command.

The problem is when we need to modify the model and then do a recreation.

public partial class UserInfo
{
    public int Id { get; set; }
    [Required]
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string UserName { get; set; }
    public string Password { get; set; }
    public DateTime RecordCreated { get; set; }
}

Upon invoking a Scaffold-DbContext with the -Force it will remove the [Required] from it.

Should I be looking at using a ViewModel, creating partial classes or what?

Very early on in using EF core 2.1 so any help would be greatly appreciated.

Joe