public async Task Delete(Guid userId, Guid photoId)
{
var photoDB = await _photosRepository.GetById(photoId);
if (photoDB == null)
{
throw new ArgumentException("Photo not found");
}
if (photoDB.UserId != userId)
{
throw new ArgumentException("Photo doesn't belong to user");
}
await Task.WhenAll(_photosRepository.Delete(photoDB),
_feedService.DeletePhotoFromFeed(userId, photoDB));
}