Utilizing the new CreateVersion7 API for ValueGeneratedOnAdd

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With the new introduction of Guid.CreateVersion7(DateTimeOffSet.UtcNow); in .NET 9 (see: dotnet/runtime#103658), there is a native way to have sortable GUID PK's without any additional 3rd party tools or custom value generators.

This new behavior might be excellent to expose in calls to ValueGeneratedOnAdd / ValueGeneratedOnAddOrUpdate.

Alternative

The user could implement something like this (simplified):

public class UUIDv7Generator : ValueGenerator
{
    protected override object NextValue(EntityEntry entry) => Guid.CreateVersion7(DateTimeOffset.UtcNow);

    public override bool GeneratesTemporaryValues { get; }
}

public void Configure(EntityTypeBuilder<MyEntity> builder)
{
    builder.Property(t => t.Id).HasValueGenerator<UUIDv7Generator>().ValueGeneratedOnAdd();