docs: def _final_data(self):
          """
          Returns
          -------
          A list of tuples representing rows from the datatable's index
          and final column, sorted accordingly.
          """
          dtbl = self.datatable
  
          objs = object_session(self)
          if isinstance(dtbl, Table):
              return objs.query(dtbl.c.indx, dtbl.c.final).all()
          else:
              raise Exception("Symbol has no datatable, likely need to cache first.")