code: def _FetchAllGraphSeriesFromTheLegacyDB(
      label,
      report_type,
      period = None,
      token = None
  ):
    
    if period is None:
      time_range = aff4.ALL_TIMES
    else:
      range_end = rdfvalue.RDFDatetime.Now()
      time_range = (range_end - period, range_end)
    series_with_timestamps = {}
    try:
      stats_for_label = aff4.FACTORY.Open(
          GetAFF4ClientReportsURN().Add(label),
          aff4_type=aff4_stats.ClientFleetStats,
          mode="r",
          age=time_range,
          token=token)
    except aff4.InstantiationError:
      # Nothing to return for the given label and report-type.
      return series_with_timestamps
    aff4_attr = _GetAFF4AttributeForReportType(report_type)
    if aff4_attr.attribute_type == rdf_stats.GraphSeries:
      for graphs in stats_for_label.GetValuesForAttribute(aff4_attr):
        graph_series = rdf_stats.ClientGraphSeries(report_type=report_type)
        for graph in graphs:
          graph_series.graphs.Append(graph)
        series_with_timestamps[graphs.age] = graph_series
    elif aff4_attr.attribute_type == rdf_stats.Graph:
      for graph in stats_for_label.GetValuesForAttribute(aff4_attr):
        graph_series = rdf_stats.ClientGraphSeries(report_type=report_type)
        graph_series.graphs.Append(graph)
        series_with_timestamps[graph.age] = graph_series
    else:
      raise AFF4AttributeTypeError(aff4_attr.attribute_type)
    return series_with_timestamps
docs: Fetches graph-series from the legacy DB [see FetchAllGraphSeries()].