public async Task <Drawing> CreateDrawing(DateTime startDate)
{
var activeDrawing = await _drawingRepository.GetActiveAsync();
if (activeDrawing != null)
{
throw new ServiceException($"Cannot create new drawing when other one is active (id: {activeDrawing.Id})!");
}
var drawing = Drawing.CreateDrawing(startDate);
await _drawingRepository.AddAsync(drawing);
await _distributedCacheService.RemoveAsync(DistributedCacheService.ACTIVE_DRAWING);
return(drawing);
}