{
  "session_id": "sess_4004",
  "user_id": "user_4004",
  "issued_at": "2026-03-14T13:05:00Z",
  "expires_at": "2026-03-14T15:05:00Z",
  "previous_device_id": "device_old_100",
  "current_device_id": "device_new_210",
  "reauth_required": true,
  "mfa_level": "step_up"
}