private async Task <DifferentialChangeset> ExtractDifferentialChangeset(TId id, IOrderedEnumerable <HistoricalEvent> events)
{
var changesets = await _repository.GetAllAsync <Guid, HistoricalChangeset>(); // TODO: keep it there, include changesets in context
var differentialChangeset = new DifferentialChangeset();
differentialChangeset.EntityId = id.ToString();
differentialChangeset.EntityTypeName = events.First().EntityName;
differentialChangeset.Changesets = events.AggregateCombine(ExtractOneDifferentialChangeset <TEntity>);
return(differentialChangeset);
}