Add RemoveTypeHint for type, but don't delete this type

Result: All data for entity will be removed

Recreate:

using System;

using Xtensive.Orm;
using Xtensive.Orm.Configuration;

public static class Program
{
    static void Main(string[] args)
    {
        var dc = new DomainConfiguration("sqlserver://localhost/DO40-Tests");
        dc.Types.Register(typeof(Source));
        dc.UpgradeMode = DomainUpgradeMode.Recreate;

        using (var domain = Domain.Build(dc))
        {
            using (var s = domain.OpenSession())
            using (s.Activate())
            using (var t = s.OpenTransaction())
            {
                new Source(Guid.NewGuid()) { Name = "Test" };
                t.Complete();
            }
        }
    }
}

[HierarchyRoot]
public class Source : Entity
{
    public Source(Guid id)
        : base(id)
    {
    }

    [Key]
    [Field(Nullable = false)]
    public Guid Id { get; private set; }

    [Field]
    public string Name { get; set; }
}

Perform:

using System;
using System.Linq;

using NUnit.Framework;

using Xtensive.Orm;
using Xtensive.Orm.Configuration;
using Xtensive.Orm.Upgrade;

public static class Program
{
    static void Main(string[] args)
    {
        var dc = new DomainConfiguration("sqlserver://localhost/DO40-Tests");
        dc.Types.Register(typeof(Source));
        dc.Types.Register(typeof(Upgrader));
        dc.UpgradeMode = DomainUpgradeMode.PerformSafely;

        using (var domain = Domain.Build(dc))
        {
            using (var s = domain.OpenSession())
            using (s.Activate())
            using (var t = s.OpenTransaction())
            {
                Assert.Greater(s.Query.All<Source>().Count(), 0);
                Assert.AreEqual("Test", s.Query.All<Source>().First().Name);
            }
        }
    }
}

public class Upgrader : UpgradeHandler
{
    protected override void AddUpgradeHints(Xtensive.Collections.ISet<UpgradeHint> hints)
    {
        hints.Add(new RemoveTypeHint("TestDO.Source"));
    }
}

[HierarchyRoot]
public class Source : Entity
{
    public Source(Guid id)
        : base(id)
    {
    }

    [Key]
    [Field(Nullable = false)]
    public Guid Id { get; private set; }

    [Field]
    public string Name { get; set; }
}