code: def get_obsgroup(self, group_id):
          
          search = mp.ObservationGroupSearch(group_id=group_id)
          b = search_obsgroups_sql_builder(search)
          sql = b.get_select_sql(columns='g.uid, g.time, g.setAtTime, g.setByUser, g.publicId, g.title,'
                                         's.name AS semanticType',
                                 skip=0, limit=1, order='g.time DESC')
          obs_groups = list(self.generators.obsgroup_generator(sql=sql, sql_args=b.sql_args))
          if not obs_groups:
              return None
          return obs_groups[0]
docs: Retrieve an existing :class:`meteorpi_model.ObservationGroup` by its ID
  
          :param string group_id:
              UUID of the observation
          :return:
              A :class:`meteorpi_model.Observation` instance, or None if not found