title: When does keycloak delete expired sessions?
body: <p>I noticed that sessions that pass the <strong>SSO session idle</strong> and <strong>SSO session max</strong> aren't immediately deleted. They seem to be invalidated and therefor useless, but they are not getting immediately removed. I can view them in the sessions tab of the admin console.</p>
  <p>Since I can't find an explanation for this, or how this mechanism works internally (didn't look into the code), I was wondering, if anyone could elaborate on what is going on? Is everything working as it should?</p>