public async Task <StateMachineBase> ActivateAsync(Guid id, Type stateMachineType)
        {
            var model = await _modelRepo.GetAsync(id);

            if (model != null)
            {
                var machine = _resolver.GetService(stateMachineType, model) as StateMachineBase;
                return(machine);
            }
            var newMachine = _resolver.GetService(stateMachineType) as StateMachineBase;
            var newModel   = newMachine.GetDto();

            newModel.Id = id;
            await _modelRepo.AddOrUpdateAsync(newModel);

            return(newMachine);
        }