Implement infrastructure so parts of the application can ask if a list of users are online, idle, or away.
T6868#98450 has some discussion. It's not yet clear whether we should store this in Aphlict or the database.
- We can store the information in the database, and have the JX.Leader make an Ajax request every few minutes.
- We can store the information on the Aphlict server, and update it when Websockets connect and disconnect.