{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-9ynv1ayn","versions":[{"created_at":"2026-06-09T16:27:37Z","element_count":103,"note":"","saved_by":"editor","sha256":"f70f7f8a1da4852aa8bbb21cf547c2ed75f4f024034216876383f09a61892fbf","version":4},{"created_at":"2026-06-09T16:07:49Z","element_count":103,"note":"","saved_by":"editor","sha256":"71988154c243780e9d97b80eea74eff9d8118e39cf79aedb8fa7a7285f7405af","version":3},{"created_at":"2026-06-09T15:54:09Z","element_count":103,"note":"","saved_by":"editor","sha256":"ad170021e21975a4e649dade4917e21c4243c5fecafa1baf01a349739dca51b4","version":2}]}