"Cloud-Sql"
- Migration Playbook：Cloud SQL for PostgreSQL → Cloud Spanner
Cloud SQL → Spanner 是 paradigm shift 級遷移、不是 drop-in。本 playbook 依 Driver / Diff / Phase / Evidence / Cutover / Cleanup 各段展開：Driver 段明示 sizing barrier（100 pu 起跳）跟 < 50ms write latency 兩條 no-go；Diff 段在 schema、operational、paradigm、component、application、data topology 之外加比 sizing / cost；Phase 0 含 sizing audit；Evidence 段補 cost crossover 報告；對照 Google 內部 Spanner 案例的 dogfood 邊界跟 Standard Chartered 受監管 banking case