diff --git a/wiki/log.md b/wiki/log.md
index 38a7e73..7326a0f 100644
--- a/wiki/log.md
+++ b/wiki/log.md
@@ -9,6 +9,13 @@ tags: [log, history]
 
 > Append-only 操作记录。格式: `## [日期] 类型 | 描述`
 
+## 2026-04-17 refactor | Phase 2B saasStore 拆分为子模块
+
+- 1025行单文件 → 5个子模块 + barrel re-export
+- saas/types.ts(103行) + shared.ts(93行) + auth.ts(362行) + billing.ts(84行) + index.ts(309行)
+- saasStore.ts 缩减为 15行 re-export barrel，25+ 消费者零改动
+- `tsc --noEmit` ✓
+
 ## 2026-04-17 refactor | Phase 5 移除空壳 Hand — Whiteboard/Slideshow/Speech
 
 - **Rust**: 删除 whiteboard.rs(422行) + slideshow.rs(797行) + speech.rs(442行)