code: def load_tree(self):
          
          timeperiod = settings.settings['synergy_start_timeperiod']
          yearly_timeperiod = time_helper.cast_to_time_qualifier(QUALIFIER_YEARLY, timeperiod)
          monthly_timeperiod = time_helper.cast_to_time_qualifier(QUALIFIER_MONTHLY, timeperiod)
          daily_timeperiod = time_helper.cast_to_time_qualifier(QUALIFIER_DAILY, timeperiod)
          hourly_timeperiod = time_helper.cast_to_time_qualifier(QUALIFIER_HOURLY, timeperiod)
  
          self._build_tree_by_level(QUALIFIER_HOURLY, COLLECTION_JOB_HOURLY, since=hourly_timeperiod)
          self._build_tree_by_level(QUALIFIER_DAILY, COLLECTION_JOB_DAILY, since=daily_timeperiod)
          self._build_tree_by_level(QUALIFIER_MONTHLY, COLLECTION_JOB_MONTHLY, since=monthly_timeperiod)
          self._build_tree_by_level(QUALIFIER_YEARLY, COLLECTION_JOB_YEARLY, since=yearly_timeperiod)
docs: method iterates thru all objects older than synergy_start_timeperiod parameter in job collections
          and loads them into this timetable