devices offered: []
init 200 {"data": {"phase": "formatting", "started": true}, "ok": true}
status 200 {"device": "/dev/sdb", "durable_id": "", "error": "", "opsign": "", "phase": "done", "reason": "", "started_at": "2026-10-21T18:38:21.309790267Z", "updated_at": "2026-10-21T18:38:23.575359593Z", "where": "/mnt/felhom-drives/hdd_1"}
