@Override
	public JSONObject main(Map<String, String> params, Session session)
			throws Exception {
		JSONObject rtn = new JSONObject();
		Data.truncate(Appointment.class.getSimpleName());
		Data.truncate(Reminder.class.getSimpleName());
		Data.truncate(Venue.class.getSimpleName());
		rtn.put("rtnCode", this.getRtnCode(200));
		return rtn;
	}