public_trace_file:
  id: 1
  user_id: 1
  visible: true
  name: Fist Trace.gpx
  size:
  latitude: 1
  longitude: 1
  timestamp: "2008-10-29 10:10:10"
  public: true
  description: This is a trace
  inserted: true
  
anon_trace_file:
  id: 2
  user_id: 2
  visible: false
  name: Private Trace.gpx
  size: 123
  latitude: 51.3
  longitude: -0.56
  timestamp: "2009-05-06 13:34:34"
  public: false
  description: This is an anonymous trace
  inserted: true