public async Task SendMessageAsync(string subscriberId, string message)
{
// Add subscriber
var sessionId = Guid.NewGuid().ToString();
await _notify.AddSubscriberAsync(subscriberId, sessionId);
// Simulate long-running task
var timer = new Timer(async state =>
{
await _notify.PublishAsync(sessionId, message);
}, message, DelaySeconds * 1000, Timeout.Infinite);
}