"Axis-Candidate"
- DynamoDB Strongly Consistent → Eventually Consistent：same protocol, different contract
DynamoDB consistency model 從 strongly consistent read 改 eventually consistent read 是 50% cost 優化但風險集中在 application contract — 同 vendor / 同 protocol / 同 table / 不同 read consistency；驗證 [#128](/report/data-topology-as-audit-dimension/) self-aware limitation 提出的 consistency axis 候選；涵蓋 read pattern audit / 5 個 production 踩雷
- Vault → AWS Secrets Manager：「secret」不是「secret」、identity model 才是核心差異
Vault → AWS Secrets Manager migration 表面是 secret store 替換、實際核心是 identity model 對位（Vault token + policy vs AWS IAM + resource policy）；驗證 [#128](/report/data-topology-as-audit-dimension/) self-aware limitation 提出的 identity axis 候選 — identity 是否獨立 audit 軸；5 個 production 踩雷（IAM principal 對位 / dynamic credential 對等失敗 / lease lifecycle 模型不同 / audit log 結構差 / 計費模型反轉）
- PostgreSQL Multi-Region GDPR Rollout：政策驅動的 migration 屬本 methodology 嗎
PostgreSQL 單 region → multi-region 同時滿足 GDPR EU residency 是 *政策驅動* 兼 *topology 變動* 兼 *operational redesign* 的多軸 migration；驗證 [#128](/report/data-topology-as-audit-dimension/) self-aware limitation 提出的 residency axis 候選 — residency 是 driver 還是獨立 audit 軸；涵蓋 logical replication 配 GDPR / 5 個 production 踩雷 / cross-region cost