The amount of data processed so far
Opaque context identifier for the job
OptionalendTimestamp for when the preparation finished
Total size of the data being prepared
OptionalstartTimestamp for when the preparation started
Current status of the job. Treat Completed | Aborted | Failed as
terminal; New | Started mean keep polling. A single-instrument prepare
is always terminal (Completed) — decide from
PrepareJobState.coverageRatio, not by polling.
OptionalstatusDetailed status information, if available
Information about a single job