QueuedDataMigrationRun : Two handles onto a run that has been queued, not performed (#1212). run no longer waits for the copy: it returns as soon as the job is on the queue, so this object carries no counts. The outcome is the job’s result (MigrationResult, via /jobs_u/get/{id}), progress is /jobs/get_progress/{id} and the job SSE stream, and cancellation is /jobs_u/queue/cancel/{id} – a data migration deliberately gets no bespoke status surface.