-case class FileCreated(eventid: Long, when: Date, who: Long, fname: String, bytes: Long) extends Event
-case class FileUpdated(eventid: Long, when: Date, who: Long, fname: String, bytes: Long) extends Event
-case class FileDeleted(eventid: Long, when: Date, who: Long, fname: String, bytes: Long) extends Event
-case class FileModified(eventid: Long, when: Date, who: Long, fname: String, bytes: Long) extends Event
+case class DiskSpaceChanged(i: Long, w: Date, u: Long, bytes: Long) extends Event(i, w, u)