feat(leaderboard): 训练完强刷 + 下拉刷新 force

- 云函数 _fetchLatestByOpenid 支持 force 跳过实例缓存重新扫描
- 训练完成设 _lb_force_refresh 标志,下次打开排行榜强刷,新数据立即可见
- 下拉刷新带 force=true,拉取最新数据
- 平时常规打开仍走 5min 缓存 + 客户端乐观缓存,不增加无谓扫描

Co-Authored-By: Claude <noreply@anthropic.com>

cloudfunctions/leaderboard/index.js

@@ -43,11 +43,11 @@ const tsOf = (d) => {
 // per openid. Uses cursor pagination (_id > lastId) instead of skip(N):
 // skip is O(N) and degrades as the collection grows; a cursor is constant
 // cost per page, and default get() order (_id ascending) won't drop/dup.
-const _fetchLatestByOpenid = async () => {
-  if (_docsCache && (Date.now() - _docsCache.ts) < CACHE_TTL) {
+const _fetchLatestByOpenid = async (force) => {
+  if (!force && _docsCache && (Date.now() - _docsCache.ts) < CACHE_TTL) {
     return _docsCache.latestByOpenid
   }
-  // 缓存过期:复用 in-flight promise,避免并发请求各自全表扫描(缓存击穿)
+  // 缓存过期或强刷(force):复用 in-flight promise,避免并发请求各自全表扫描(缓存击穿)
   if (_docsCachePromise) return _docsCachePromise
   _docsCachePromise = (async () => {
   const latestByOpenid = new Map()
@@ -81,7 +81,7 @@ const _fetchLatestByOpenid = async () => {
 }
 
 exports.main = async (event) => {
-  const { period, maxRank } = event || {}
+  const { period, maxRank, force } = event || {}
   const limit = Math.max(1, Math.min(parseInt(maxRank) || DEFAULT_MAX_RANK, 500))
   if (!period) return { err: 'missing period' }
 
@@ -107,7 +107,7 @@ exports.main = async (event) => {
   // start add() bug; only the latest updatedAt counts, else we'd sum the
   // same records N times and inflate the board. Latest (not first) also
   // gives the freshest profile.nickname before admin-dedupe runs.
-  const latestByOpenid = await _fetchLatestByOpenid()
+  const latestByOpenid = await _fetchLatestByOpenid(force)
 
   // Second pass: each openid appears exactly once, so the accumulation
   // logic doesn't need any dedup guards.

config.js

@@ -7,7 +7,7 @@ module.exports = {
   version: 'v3.01',
 
   /** 最后更新日期，外显在设置页「关于」 */
-  updatedAt: '2026-07-27',
+  updatedAt: '2026-07-28',
 
   /** 开发者名称 / 微信号，设置页点击可复制 */
   developer: '刘承',

pages/leaderboard/leaderboard.js

@@ -35,16 +35,20 @@ Page({
       const tb = this.getTabBar()
       if (tb) tb.setData({ selected: 2 })
     } catch (e) {}
-    if (this._firstShow) {
-      this._firstShow = false
-      this.fetchRank()
-      return
+    // 训练完设的强刷标志:下次进排行榜跳过云函数缓存,立刻拿到含新记录的数据
+    let force = false
+    try {
+      if (wx.getStorageSync('_lb_force_refresh')) {
+        force = true
+        wx.removeStorageSync('_lb_force_refresh')
       }
-    this.fetchRank()
+    } catch (e) {}
+    this._firstShow = false
+    this.fetchRank(undefined, force)
   },
 
   onPullDownRefresh() {
-    this.fetchRank(() => wx.stopPullDownRefresh())
+    this.fetchRank(() => wx.stopPullDownRefresh(), true)
   },
 
   switchPeriod(e) {
@@ -54,7 +58,7 @@ Page({
     this.fetchRank()
   },
 
-  fetchRank(cb) {
+  fetchRank(cb, force) {
     // 序列号:快速切换周期时丢弃旧响应,避免旧 period 的数据覆盖新 period
     this._fetchSeq = (this._fetchSeq || 0) + 1
     const seq = this._fetchSeq
@@ -81,7 +85,8 @@ Page({
       name: 'leaderboard',
       data: {
         period,
-        maxRank: config.leaderboardMaxRank
+        maxRank: config.leaderboardMaxRank,
+        force: !!force
       }
     }).then(res => {
       if (seq !== this._fetchSeq) { if (cb) cb(); return }  // 过期响应,丢弃

pages/timer/timer.js

@@ -403,6 +403,8 @@ Page({
 
     // Flag for the index page's "训练完成" highlight
     try { wx.setStorageSync('_last_train_at', Date.now()) } catch (e) {}
+    // 标记排行榜强刷:下次打开排行榜跳过云函数缓存,让刚训练的数据立即可见
+    try { wx.setStorageSync('_lb_force_refresh', true) } catch (e) {}
 
     const finalStreak = storage.getStreak().count