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I believe that this ruby code gets the user ids from the sessions updated in the last 15 minutes

Session.find (:all, :conditions=>["updated_at > ?", 15.minutes.ago]).each do |session|
  user_id = session.data[:user]
end

database schema:
  • messages
    • to_id, to_type   (user or guest)
    • from_id, from_type  (user or guest)
    • message
    • created_at
  • guests
    • ip_address
    • name
  • friends
    • friend1_id  (user) 
    • friend2_id  (user)


some docs for the javascript thing we might use for the pings:
[ http://prototypejs.org/api /timedObserver][http://prototypejs.org/api/timedObserver]