title: Sequence diagram for simple login system
body: <p>I have a partially finished sequence diagram but it needs more detail. Once the user has been retrieved from the database how does the system decide whether to accept or reject a login. I mean how do I implement it to my sequence diagram:</p>
  
  <p><a href="https://i.stack.imgur.com/RZh3R.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RZh3R.jpg" alt="enter image description here"></a></p>