"Topology"
- MongoDB Shard Expansion + Multi-DC：Type F「不需要 parallel run」的 multi-region 例外
MongoDB sharded cluster 加 shard + 跨 DC expansion 是 Type F「topology re-layout」第 3 個 dogfood — 同時改 sharding + replication topology + region distribution；驗證 [#128](/report/data-topology-as-audit-dimension/) self-aware limitation 第 3 點「Type F 不需要 parallel run」claim 的例外（multi-region rollout 必須 parallel run + 切流量）；涵蓋 chunk migration / replica set add member / cross-DC routing
- Redis Cluster Re-sharding：source = target，但 topology 重劃的 5 段流程
Redis cluster re-sharding 是 5 type migration 漏類實證 — source / target 同 cluster、無 schema / paradigm 差、但 16384 slot 重分配是核心；本文涵蓋 4 種 re-sharding driver、slot migration 機制、redis-cli --cluster rebalance / reshard 工具、5 個 production 踩雷（cluster busy / replica lag / client cache stale / cross-slot transaction / monitor gap）
- PostgreSQL Partition Redesign：當 monthly partition 越跑越慢
PostgreSQL partition redesign 是 Type F「topology re-layout」第 2 個 dogfood — 從 monthly partition 改 daily / 從 range 改 list / 從單軸改 sub-partition；6 維 audit 皆 Low + topology 軸 High；涵蓋 partition 不平衡偵測、ATTACH/DETACH 線上重劃、5 個 production 踩雷、跟 partition_pruning + autovacuum 整合