title: Is user_pseudo_id the same as a a session id? How to group all events by session? - Firebase BigQuery
body: <p>I have an iOS App. I am trying to figure out how users move through my app. I am looking for a way to group all the events by some sort of session id. I assumed all fireBase events would have a session id. This does not seem to be the case.</p>
  
  <p>I noticed there is a <code>user_pseudo_id</code>. I did some testing, where I logged an event that only I could ever have created. I noticed that sometimes the <code>user_pseudo_id</code> changes. Any idea what triggers a new id? I restarted and deleted/reinstalled the app many times so its not so easy to reverse engineer when <code>user_pseudo_id</code> changes</p>
  
  <p>Thanks in advance</p>
  
  <p>Andy</p>