Change Details

We'll need to: * validate the cohort by username, not failing unless there are 0 valid names * run a few different reports with this cohort (but the specific reports that run can be a hard-coded configuration, we're not expecting this to be a common thing we need to build generic infrastructure for if that's too hard. * get the results from the reports * delete the cohort (or just never create it if that's easier, but I think MultiProjectMetricReportNode needs it) * put the results in the db with a guid id defined by the API when it first accepted the request