Method ThenByDescendingRedb<TKey>(Expression<Func<IRedbObject, TKey>>)

Additional descending sort by IRedbObject base fields.
Uses IRedbObject for compile-time safety - Props not visible in IntelliSense!

public override IOrderedRedbQueryable<TProps> ThenByDescendingRedb<TKey>(Expression<Func<IRedbObject, TKey>> keySelector)