public override Task DoWork(CancellationToken cancellationToken)
        {
            _logger.LogInformation($"{DateTime.Now:hh:mm:ss} ReminderCron: Checking vaccination dates...");

            using var scope = _serviceProvider.CreateScope();
            var animalAggegatorRepo = scope.ServiceProvider.GetRequiredService <IAnimalAggregatorRepository>();

            DateTime minDate = DateTime.Now.AddDays(-30);
            var      animals = animalAggegatorRepo.GetBeforeVaccinationDate(minDate);

            if (animals.Count != 0)
            {
                var    userManager = scope.ServiceProvider.GetRequiredService <UserManager <User> >();
                string url         = _configuration.GetSection("WebUrl").Value + "/animal/";
                var    sb          = new StringBuilder();
                sb.Append("Gyvūnai skiepiti ne ankščiau kaip prieš 30 dienų:<br>");
                foreach (Animal animal in animals)
                {
                    sb.Append(animal.VaccinationDate).Append(" ").Append(url + animal.Id).Append("<br>");
                }

                var emails = userManager.Users.Select(user => user.Email).ToList();
                _mailer.SendMassEmailAsync(emails, "Skiepų priminimas", sb.ToString());

                animalAggegatorRepo.UpdateReminders(animals);
            }

            return(Task.CompletedTask);
        }