data_origin and data_origin_type have been added to the 'extended' metadata schema
The extended metadata does not state if data are from observations, or from a model like ERA5.
To obtain this information, one needs to follow the "full_metadata" URL to view all of the metadata for each time series.
Therefore, the 'timeseries' fields "data_origin" and "data_origin_type" should be added to the 'extended' metadata schema.
This needs to be added in the code:
https://gitlab.jsc.fz-juelich.de/esde/toar-data/toar-ii-analysis-service/-/blob/master/analysis_service/tasks/utils.py#L180