updated era catalog

esm-collections/cloud-access/dkrz_era5_disk.json

@@ -117,10 +117,11 @@
         ],
         "variable_column_name": "short_name",
         "groupby_attrs": [
+	    "era_id",
             "table_id",
             "stepType",
             "level_type",
             "frequency"
         ]
     }
-}
\ No newline at end of file
+}