Time series projects require that each timestamp have at most one row corresponding to it. However, multiple series of data can be handled within a single project by designating a multiseries ID column that assigns each row to a particular series. See the :ref:multiseries <multiseries> docs on time series projects for more information.
Note that detection will have to be triggered via :http:post:/api/v2/projects/(projectId)/multiseriesProperties/ in order for multiseries id columns to appear here. The route will return successfully with an empty array of detected columns if detection hasn't run yet, or hasn't found any valid columns.
Click Try It! to start a request and see the response here!