"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 走 6 規格面 Driver / Diff / Phase / Evidence / Cutover / Cleanup：Driver 段明示 sizing barrier（100 pu 起跳）跟 < 50ms write latency 兩條 no-go；Diff 段加 sizing / cost 第 7 規格面；Phase 0 含 sizing audit；Evidence 段補 cost crossover 報告；對照 9.C10 Google internal dogfood 邊界跟 Standard Chartered 受監管 banking case