title: Token Authentication Logout: should I delete the token?
body: <p>I am building a token-authentication system for a mobile backend with Rails. I understand there is devise, but our auth path is kind like different so I build it from scratch.</p>
  
  <p>Just curious, when a user log out. What should happen to the token in Mobile end and Server end.</p>
  
  <ol>
  <li>Should the token in mobile end be deleted?</li>
  <li>Should the token in server end be deleted? And a new will be generated when this user logged in again.</li>
  </ol>
  
  <p>Thanks!</p>