diff --git a/AGENTS.md b/AGENTS.md
new file mode 100644
index 0000000..068ac5a
--- /dev/null
+++ b/AGENTS.md
@@ -0,0 +1,27 @@
+# AGENTS
+
+## Update Discipline
+
+- Every shipped feature change must be recorded in the in-app update log page at `/changelog`.
+- Every shipped feature change must also be recorded in [docs/CHANGELOG.md](/root/auto/tennis/docs/CHANGELOG.md).
+- When online smoke tests are run, record whether the public site is already serving the new build or still on an older asset revision.
+- Each update log entry must include:
+  - release date
+  - feature summary
+  - tested modules or commands
+  - corresponding repository version identifier
+    - prefer the git short commit hash
+- After implementation, run the relevant tests before pushing.
+- Only record an entry as shipped after the related tests pass.
+- When a feature is deployed successfully, append the update entry before or together with the repository submission so the changelog stays in sync with the codebase.
+
+## Session Policy
+
+- Username login must support multiple active sessions across multiple devices.
+- New logins must not invalidate prior valid sessions for the same user.
+- Session validation should be tolerant of older token payloads where optional display fields are absent.
+
+## Timezone Policy
+
+- User-facing time displays should use `Asia/Shanghai`.
+- Daily aggregation keys and schedule-related server calculations should also use `Asia/Shanghai`.
diff --git a/client/src/App.tsx b/client/src/App.tsx
index 2b7ba0a..497067b 100644
--- a/client/src/App.tsx
+++ b/client/src/App.tsx
@@ -22,6 +22,7 @@ import Reminders from "./pages/Reminders";
 import VisionLab from "./pages/VisionLab";
 import Logs from "./pages/Logs";
 import AdminConsole from "./pages/AdminConsole";
+import ChangeLog from "./pages/ChangeLog";
 
 function DashboardRoute({ component: Component }: { component: React.ComponentType }) {
   return (
@@ -78,6 +79,9 @@ function Router() {
       <Route path="/logs">
         <DashboardRoute component={Logs} />
       </Route>
+      <Route path="/changelog">
+        <DashboardRoute component={ChangeLog} />
+      </Route>
       <Route path="/vision-lab">
         <DashboardRoute component={VisionLab} />
       </Route>
diff --git a/client/src/components/DashboardLayout.tsx b/client/src/components/DashboardLayout.tsx
index 0c5b6c9..b5a3afb 100644
--- a/client/src/components/DashboardLayout.tsx
+++ b/client/src/components/DashboardLayout.tsx
@@ -51,6 +51,7 @@ const menuItems: MenuItem[] = [
   { icon: Trophy, label: "排行榜", path: "/leaderboard", group: "stats" },
   { icon: BookOpen, label: "教程库", path: "/tutorials", group: "learn" },
   { icon: Bell, label: "训练提醒", path: "/reminders", group: "learn" },
+  { icon: ScrollText, label: "更新日志", path: "/changelog", group: "learn" },
   { icon: ScrollText, label: "系统日志", path: "/logs", group: "learn" },
   { icon: Microscope, label: "视觉测试", path: "/vision-lab", group: "learn", adminOnly: true },
   { icon: Shield, label: "管理系统", path: "/admin", group: "learn", adminOnly: true },
diff --git a/client/src/components/TaskCenter.tsx b/client/src/components/TaskCenter.tsx
index bce25c9..352c41e 100644
--- a/client/src/components/TaskCenter.tsx
+++ b/client/src/components/TaskCenter.tsx
@@ -6,6 +6,7 @@ import { Progress } from "@/components/ui/progress";
 import { Alert, AlertDescription } from "@/components/ui/alert";
 import { Sheet, SheetContent, SheetHeader, SheetTitle, SheetTrigger } from "@/components/ui/sheet";
 import { ScrollArea } from "@/components/ui/scroll-area";
+import { formatDateTimeShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import { AlertTriangle, BellRing, CheckCircle2, Loader2, RefreshCcw } from "lucide-react";
 
@@ -147,7 +148,7 @@ export function TaskCenter({ compact = false }: { compact?: boolean }) {
 
                   <div className="mt-3 flex items-center justify-between text-xs text-muted-foreground">
                     <span>
-                      {new Date(task.createdAt).toLocaleString("zh-CN")} · 耗时 {formatTaskTiming(task)}
+                      {formatDateTimeShanghai(task.createdAt)} · 耗时 {formatTaskTiming(task)}
                     </span>
                     {task.status === "failed" ? (
                       <Button
diff --git a/client/src/lib/actionRecognition.ts b/client/src/lib/actionRecognition.ts
new file mode 100644
index 0000000..4ee6134
--- /dev/null
+++ b/client/src/lib/actionRecognition.ts
@@ -0,0 +1,242 @@
+export type ActionType =
+  | "forehand"
+  | "backhand"
+  | "serve"
+  | "volley"
+  | "overhead"
+  | "slice"
+  | "lob"
+  | "unknown";
+
+export type Point = {
+  x: number;
+  y: number;
+  visibility?: number;
+};
+
+export type TrackingState = {
+  prevTimestamp?: number;
+  prevRightWrist?: Point;
+  prevLeftWrist?: Point;
+  prevHipCenter?: Point;
+};
+
+export type ActionObservation = {
+  action: ActionType;
+  confidence: number;
+};
+
+export type ActionFrame = {
+  action: ActionType;
+  confidence: number;
+};
+
+export const ACTION_LABELS: Record<ActionType, string> = {
+  forehand: "正手挥拍",
+  backhand: "反手挥拍",
+  serve: "发球",
+  volley: "截击",
+  overhead: "高压",
+  slice: "切削",
+  lob: "挑高球",
+  unknown: "未知动作",
+};
+
+function clamp(value: number, min: number, max: number) {
+  return Math.max(min, Math.min(max, value));
+}
+
+function distance(a?: Point, b?: Point) {
+  if (!a || !b) return 0;
+  const dx = a.x - b.x;
+  const dy = a.y - b.y;
+  return Math.sqrt(dx * dx + dy * dy);
+}
+
+function getAngle(a?: Point, b?: Point, c?: Point) {
+  if (!a || !b || !c) return 0;
+  const radians = Math.atan2(c.y - b.y, c.x - b.x) - Math.atan2(a.y - b.y, a.x - b.x);
+  let angle = Math.abs((radians * 180) / Math.PI);
+  if (angle > 180) angle = 360 - angle;
+  return angle;
+}
+
+export function recognizeActionFrame(landmarks: Point[], tracking: TrackingState, timestamp: number): ActionFrame {
+  const nose = landmarks[0];
+  const leftShoulder = landmarks[11];
+  const rightShoulder = landmarks[12];
+  const leftElbow = landmarks[13];
+  const rightElbow = landmarks[14];
+  const leftWrist = landmarks[15];
+  const rightWrist = landmarks[16];
+  const leftHip = landmarks[23];
+  const rightHip = landmarks[24];
+  const leftKnee = landmarks[25];
+  const rightKnee = landmarks[26];
+  const leftAnkle = landmarks[27];
+  const rightAnkle = landmarks[28];
+
+  const hipCenter = {
+    x: ((leftHip?.x ?? 0.5) + (rightHip?.x ?? 0.5)) / 2,
+    y: ((leftHip?.y ?? 0.7) + (rightHip?.y ?? 0.7)) / 2,
+  };
+
+  const dtMs = tracking.prevTimestamp ? Math.max(16, timestamp - tracking.prevTimestamp) : 33;
+  const rightSpeed = distance(rightWrist, tracking.prevRightWrist) * (1000 / dtMs);
+  const leftSpeed = distance(leftWrist, tracking.prevLeftWrist) * (1000 / dtMs);
+  const hipSpeed = distance(hipCenter, tracking.prevHipCenter) * (1000 / dtMs);
+  const rightVerticalMotion = tracking.prevRightWrist ? tracking.prevRightWrist.y - (rightWrist?.y ?? tracking.prevRightWrist.y) : 0;
+
+  const shoulderTilt = Math.abs((leftShoulder?.y ?? 0.3) - (rightShoulder?.y ?? 0.3));
+  const hipTilt = Math.abs((leftHip?.y ?? 0.55) - (rightHip?.y ?? 0.55));
+  const headOffset = Math.abs((nose?.x ?? 0.5) - (((leftShoulder?.x ?? 0.45) + (rightShoulder?.x ?? 0.55)) / 2));
+  const kneeBend = ((getAngle(leftHip, leftKnee, leftAnkle) || 165) + (getAngle(rightHip, rightKnee, rightAnkle) || 165)) / 2;
+  const rightElbowAngle = getAngle(rightShoulder, rightElbow, rightWrist) || 145;
+  const leftElbowAngle = getAngle(leftShoulder, leftElbow, leftWrist) || 145;
+  const footSpread = Math.abs((leftAnkle?.x ?? 0.42) - (rightAnkle?.x ?? 0.58));
+  const shoulderSpan = Math.abs((rightShoulder?.x ?? 0.56) - (leftShoulder?.x ?? 0.44));
+  const wristSpread = Math.abs((rightWrist?.x ?? 0.62) - (leftWrist?.x ?? 0.38));
+  const shoulderCenterX = ((leftShoulder?.x ?? 0.45) + (rightShoulder?.x ?? 0.55)) / 2;
+  const torsoOffset = Math.abs(shoulderCenterX - hipCenter.x);
+  const rightForward = (rightWrist?.x ?? shoulderCenterX) - hipCenter.x;
+  const leftForward = hipCenter.x - (leftWrist?.x ?? shoulderCenterX);
+  const contactHeight = hipCenter.y - (rightWrist?.y ?? hipCenter.y);
+  const landmarkVisibility = landmarks
+    .filter((item) => typeof item?.visibility === "number")
+    .map((item) => item.visibility as number);
+  const averageVisibility = landmarkVisibility.length > 0
+    ? landmarkVisibility.reduce((sum, item) => sum + item, 0) / landmarkVisibility.length
+    : 0.8;
+
+  tracking.prevTimestamp = timestamp;
+  tracking.prevRightWrist = rightWrist;
+  tracking.prevLeftWrist = leftWrist;
+  tracking.prevHipCenter = hipCenter;
+
+  if (averageVisibility < 0.58 || shoulderSpan < 0.08 || footSpread < 0.05 || headOffset > 0.26) {
+    return { action: "unknown", confidence: 0.28 };
+  }
+
+  const serveConfidence = clamp(
+    rightVerticalMotion * 2.2 +
+    Math.max(0, (hipCenter.y - (rightWrist?.y ?? hipCenter.y)) * 3.4) +
+    (rightWrist?.y ?? 1) < (nose?.y ?? 0.3) ? 0.34 : 0 +
+    rightElbowAngle > 145 ? 0.12 : 0 -
+    shoulderTilt * 1.8,
+    0,
+    1,
+  );
+
+  const overheadConfidence = clamp(
+    serveConfidence * 0.62 +
+    ((rightWrist?.y ?? 1) < (nose?.y ?? 0.3) ? 0.22 : 0) +
+    (rightSpeed > 0.34 ? 0.16 : 0) -
+    (kneeBend < 150 ? 0.08 : 0),
+    0,
+    1,
+  );
+
+  const forehandConfidence = clamp(
+    (rightSpeed * 1.5) +
+    Math.max(0, rightForward * 2.3) +
+    (rightElbowAngle > 120 ? 0.1 : 0) +
+    (hipSpeed > 0.07 ? 0.08 : 0) +
+    (footSpread > 0.12 ? 0.05 : 0) -
+    shoulderTilt * 1.1,
+    0,
+    1,
+  );
+
+  const backhandConfidence = clamp(
+    (leftSpeed * 1.45) +
+    Math.max(0, leftForward * 2.15) +
+    (leftElbowAngle > 118 ? 0.1 : 0) +
+    (wristSpread > shoulderSpan * 1.2 ? 0.08 : 0) +
+    (torsoOffset > 0.04 ? 0.06 : 0),
+    0,
+    1,
+  );
+
+  const volleyConfidence = clamp(
+    ((rightSpeed + leftSpeed) * 0.8) +
+    (footSpread < 0.12 ? 0.12 : 0) +
+    (kneeBend < 155 ? 0.12 : 0) +
+    (Math.abs(contactHeight) < 0.16 ? 0.1 : 0) +
+    (hipSpeed > 0.08 ? 0.08 : 0),
+    0,
+    1,
+  );
+
+  const sliceConfidence = clamp(
+    forehandConfidence * 0.68 +
+    ((rightWrist?.y ?? 0.5) > hipCenter.y ? 0.12 : 0) +
+    (contactHeight < 0.05 ? 0.1 : 0),
+    0,
+    1,
+  );
+
+  const lobConfidence = clamp(
+    overheadConfidence * 0.55 +
+    ((rightWrist?.y ?? 1) < (leftShoulder?.y ?? 0.3) ? 0.14 : 0) +
+    (hipSpeed < 0.08 ? 0.06 : 0),
+    0,
+    1,
+  );
+
+  const candidates = ([
+    ["serve", serveConfidence],
+    ["overhead", overheadConfidence],
+    ["forehand", forehandConfidence],
+    ["backhand", backhandConfidence],
+    ["volley", volleyConfidence],
+    ["slice", sliceConfidence],
+    ["lob", lobConfidence],
+  ] as Array<[ActionType, number]>).sort((left, right) => right[1] - left[1]);
+
+  const [action, confidence] = candidates[0] || ["unknown", 0];
+  if (confidence < 0.45) {
+    return { action: "unknown", confidence: clamp(confidence, 0.18, 0.42) };
+  }
+
+  return { action, confidence: clamp(confidence, 0, 1) };
+}
+
+export function stabilizeActionFrame(frame: ActionFrame, history: ActionObservation[]) {
+  const nextHistory = [...history, { action: frame.action, confidence: frame.confidence }].slice(-6);
+  history.splice(0, history.length, ...nextHistory);
+
+  const weights = nextHistory.map((_, index) => index + 1);
+  const scores = nextHistory.reduce<Record<ActionType, number>>((acc, sample, index) => {
+    acc[sample.action] = (acc[sample.action] || 0) + sample.confidence * weights[index];
+    return acc;
+  }, {
+    forehand: 0,
+    backhand: 0,
+    serve: 0,
+    volley: 0,
+    overhead: 0,
+    slice: 0,
+    lob: 0,
+    unknown: 0,
+  });
+
+  const ranked = Object.entries(scores).sort((a, b) => b[1] - a[1]) as Array<[ActionType, number]>;
+  const [winner = "unknown", winnerScore = 0] = ranked[0] || [];
+  const [, runnerScore = 0] = ranked[1] || [];
+  const winnerSamples = nextHistory.filter((sample) => sample.action === winner);
+  const averageConfidence = winnerSamples.length > 0
+    ? winnerSamples.reduce((sum, sample) => sum + sample.confidence, 0) / winnerSamples.length
+    : frame.confidence;
+
+  const stableAction =
+    winner === "unknown" && frame.action !== "unknown" && frame.confidence >= 0.52
+      ? frame.action
+      : winnerScore - runnerScore < 0.2 && frame.confidence >= 0.65
+        ? frame.action
+        : winner;
+
+  return {
+    action: stableAction,
+    confidence: clamp(stableAction === frame.action ? Math.max(frame.confidence, averageConfidence) : averageConfidence, 0, 1),
+  };
+}
diff --git a/client/src/lib/changelog.ts b/client/src/lib/changelog.ts
new file mode 100644
index 0000000..a132544
--- /dev/null
+++ b/client/src/lib/changelog.ts
@@ -0,0 +1,80 @@
+export type ChangeLogEntry = {
+  version: string;
+  releaseDate: string;
+  repoVersion: string;
+  summary: string;
+  features: string[];
+  tests: string[];
+};
+
+export const CHANGE_LOG_ENTRIES: ChangeLogEntry[] = [
+  {
+    version: "2026.03.15-session-changelog",
+    releaseDate: "2026-03-15",
+    repoVersion: "pending-commit",
+    summary: "多端 session、更新日志页面、录制动作摘要与上海时区显示同步收口。",
+    features: [
+      "用户名登录生成独立 sid，同一账号多端登录保持并行有效",
+      "新增 /changelog 页面和侧边栏入口，展示版本、仓库版本和验证记录",
+      "训练进度页可展开查看最近训练记录的具体时间、动作统计和录制有效性",
+      "录制页增加动作抽样摘要、无效录制标记与 media 预归档状态",
+      "Dashboard、任务中心、管理台、评分、日志、视觉测试、视频库等页面统一使用 Asia/Shanghai 时间显示",
+    ],
+    tests: [
+      "pnpm check",
+      "pnpm test",
+      "pnpm test:go",
+      "pnpm build",
+      "Playwright smoke: https://te.hao.work/ 双上下文登录 H1 后 dashboard 均保持有效；线上 /changelog 仍显示旧构建，待部署后复测",
+    ],
+  },
+  {
+    version: "2026.03.15-recorder-zoom",
+    releaseDate: "2026-03-15",
+    repoVersion: "c4ec397",
+    summary: "补齐录制页与实时分析页的节省流量模式、镜头缩放和移动端控制。",
+    features: [
+      "在线录制默认切换为节省流量模式",
+      "在线录制支持镜头焦距放大缩小",
+      "实时分析支持镜头焦距放大缩小",
+      "页面内增加拍摄与流量设置说明",
+    ],
+    tests: [
+      "pnpm check",
+      "pnpm exec vitest run client/src/lib/media.test.ts client/src/lib/camera.test.ts",
+      "Playwright 真实站点检查 /live-camera 与 /recorder 新控件可见",
+    ],
+  },
+  {
+    version: "2026.03.15-videos-crud",
+    releaseDate: "2026-03-15",
+    repoVersion: "bd89981",
+    summary: "视频库支持新增、编辑、删除训练视频记录。",
+    features: [
+      "视频库新增外部视频登记",
+      "视频库支持编辑标题和动作类型",
+      "视频库支持删除视频及关联分析引用",
+      "视频详情读取按当前用户权限收敛",
+    ],
+    tests: [
+      "pnpm check",
+      "pnpm exec vitest run server/features.test.ts -t \"video\\\\.\"",
+      "Playwright 真实站点完成 /videos 新增-编辑-删除全链路",
+    ],
+  },
+  {
+    version: "v3.0.0",
+    releaseDate: "2026-03-14",
+    repoVersion: "历史版本",
+    summary: "教程库、提醒、通知等学习能力上线。",
+    features: [
+      "训练视频教程库",
+      "教程自评与学习进度",
+      "训练提醒通知",
+      "通知历史管理",
+    ],
+    tests: [
+      "教程库、提醒、通知相关测试通过",
+    ],
+  },
+];
diff --git a/client/src/lib/media.ts b/client/src/lib/media.ts
index 6e17747..e2edf16 100644
--- a/client/src/lib/media.ts
+++ b/client/src/lib/media.ts
@@ -14,6 +14,12 @@ export type ArchiveStatus =
   | "completed"
   | "failed";
 
+export type PreviewStatus =
+  | "idle"
+  | "processing"
+  | "ready"
+  | "failed";
+
 export type MediaMarker = {
   id: string;
   type: string;
@@ -29,6 +35,7 @@ export type MediaSession = {
   title: string;
   status: MediaSessionStatus;
   archiveStatus: ArchiveStatus;
+  previewStatus: PreviewStatus;
   format: string;
   mimeType: string;
   qualityPreset: string;
@@ -37,8 +44,10 @@ export type MediaSession = {
   reconnectCount: number;
   uploadedSegments: number;
   uploadedBytes: number;
+  previewSegments: number;
   durationMs: number;
   lastError?: string;
+  previewUpdatedAt?: string;
   streamConnected: boolean;
   lastStreamAt?: string;
   playback: {
diff --git a/client/src/lib/time.ts b/client/src/lib/time.ts
new file mode 100644
index 0000000..7c95c11
--- /dev/null
+++ b/client/src/lib/time.ts
@@ -0,0 +1,57 @@
+const APP_TIME_ZONE = "Asia/Shanghai";
+
+type DateLike = string | number | Date | null | undefined;
+
+function toDate(value: DateLike) {
+  if (value == null) return null;
+  const date = value instanceof Date ? value : new Date(value);
+  if (Number.isNaN(date.getTime())) return null;
+  return date;
+}
+
+export function formatDateTimeShanghai(
+  value: DateLike,
+  options?: Intl.DateTimeFormatOptions,
+) {
+  const date = toDate(value);
+  if (!date) return "";
+  return date.toLocaleString("zh-CN", {
+    timeZone: APP_TIME_ZONE,
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+    hour: "2-digit",
+    minute: "2-digit",
+    second: options?.second,
+    ...options,
+  });
+}
+
+export function formatDateShanghai(
+  value: DateLike,
+  options?: Intl.DateTimeFormatOptions,
+) {
+  const date = toDate(value);
+  if (!date) return "";
+  return date.toLocaleDateString("zh-CN", {
+    timeZone: APP_TIME_ZONE,
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+    ...options,
+  });
+}
+
+export function formatMonthDayShanghai(value: DateLike) {
+  const date = toDate(value);
+  if (!date) return "";
+  return date.toLocaleDateString("zh-CN", {
+    timeZone: APP_TIME_ZONE,
+    month: "short",
+    day: "numeric",
+  });
+}
+
+export function getAppTimeZoneLabel() {
+  return APP_TIME_ZONE;
+}
diff --git a/client/src/pages/AdminConsole.tsx b/client/src/pages/AdminConsole.tsx
index 94d78eb..8779559 100644
--- a/client/src/pages/AdminConsole.tsx
+++ b/client/src/pages/AdminConsole.tsx
@@ -7,6 +7,7 @@ import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
 import { Input } from "@/components/ui/input";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
+import { formatDateTimeShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import { Activity, Database, RefreshCw, Settings2, Shield, Sparkles, Users } from "lucide-react";
 
@@ -193,7 +194,7 @@ export default function AdminConsole() {
                         </Badge>
                       </div>
                       <div className="mt-2 text-sm text-muted-foreground">
-                        {task.userName || task.userId} · {new Date(task.createdAt).toLocaleString("zh-CN")}
+                        {task.userName || task.userId} · {formatDateTimeShanghai(task.createdAt)}
                       </div>
                     </div>
                     <div className="min-w-[180px]">
@@ -300,7 +301,7 @@ export default function AdminConsole() {
                         {item.targetUserId ? <Badge variant="outline">目标用户 {item.targetUserId}</Badge> : null}
                       </div>
                       <div className="mt-2 text-sm text-muted-foreground">
-                        管理员 {item.adminName || item.adminUserId} · {new Date(item.createdAt).toLocaleString("zh-CN")}
+                        管理员 {item.adminName || item.adminUserId} · {formatDateTimeShanghai(item.createdAt)}
                       </div>
                     </div>
                     {item.entityId ? <div className="text-sm text-muted-foreground">实体 {item.entityId}</div> : null}
diff --git a/client/src/pages/ChangeLog.tsx b/client/src/pages/ChangeLog.tsx
new file mode 100644
index 0000000..15f68a8
--- /dev/null
+++ b/client/src/pages/ChangeLog.tsx
@@ -0,0 +1,66 @@
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { CHANGE_LOG_ENTRIES } from "@/lib/changelog";
+import { formatDateShanghai } from "@/lib/time";
+import { GitBranch, ListChecks, ScrollText } from "lucide-react";
+
+export default function ChangeLog() {
+  return (
+    <div className="space-y-6">
+      <section className="rounded-[28px] border border-border/60 bg-[radial-gradient(circle_at_top_left,_rgba(14,165,233,0.1),_transparent_28%),linear-gradient(180deg,rgba(255,255,255,1),rgba(248,250,252,0.96))] p-6 shadow-sm">
+        <div className="flex items-start gap-4">
+          <div className="flex h-12 w-12 items-center justify-center rounded-2xl bg-primary/10 text-primary">
+            <ScrollText className="h-6 w-6" />
+          </div>
+          <div>
+            <h1 className="text-2xl font-semibold tracking-tight">更新日志</h1>
+            <p className="mt-2 text-sm leading-6 text-muted-foreground">
+              这里会按版本记录已上线的新功能、对应仓库版本和验证结果。后续每次改动测试通过并提交后，都会继续追加到这里。
+            </p>
+          </div>
+        </div>
+      </section>
+
+      <div className="space-y-4">
+        {CHANGE_LOG_ENTRIES.map((entry) => (
+          <Card key={`${entry.version}-${entry.repoVersion}`} className="border-0 shadow-sm">
+            <CardHeader className="pb-3">
+              <div className="flex flex-col gap-3 lg:flex-row lg:items-start lg:justify-between">
+                <div>
+                  <CardTitle className="text-lg">{entry.version}</CardTitle>
+                  <CardDescription className="mt-2">{entry.summary}</CardDescription>
+                </div>
+                <div className="flex flex-wrap gap-2">
+                  <Badge variant="secondary">{formatDateShanghai(entry.releaseDate)}</Badge>
+                  <Badge variant="outline" className="gap-1">
+                    <GitBranch className="h-3 w-3" />
+                    {entry.repoVersion}
+                  </Badge>
+                </div>
+              </div>
+            </CardHeader>
+            <CardContent className="space-y-4">
+              <div>
+                <div className="text-sm font-medium">上线内容</div>
+                <div className="mt-2 flex flex-wrap gap-2">
+                  {entry.features.map((feature) => (
+                    <Badge key={feature} variant="secondary">{feature}</Badge>
+                  ))}
+                </div>
+              </div>
+              <div>
+                <div className="flex items-center gap-2 text-sm font-medium">
+                  <ListChecks className="h-4 w-4 text-primary" />
+                  验证记录
+                </div>
+                <ul className="mt-2 list-disc space-y-1 pl-5 text-sm text-muted-foreground">
+                  {entry.tests.map((item) => <li key={item}>{item}</li>)}
+                </ul>
+              </div>
+            </CardContent>
+          </Card>
+        ))}
+      </div>
+    </div>
+  );
+}
diff --git a/client/src/pages/Checkin.tsx b/client/src/pages/Checkin.tsx
index 4aa14b2..f4f55a6 100644
--- a/client/src/pages/Checkin.tsx
+++ b/client/src/pages/Checkin.tsx
@@ -5,6 +5,7 @@ import { Badge } from "@/components/ui/badge";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
 import { Progress } from "@/components/ui/progress";
 import { Skeleton } from "@/components/ui/skeleton";
+import { formatDateShanghai } from "@/lib/time";
 import { Award, Calendar, Flame, Radar, Sparkles, Swords, Trophy } from "lucide-react";
 
 const CATEGORY_META: Record<string, { label: string; tone: string }> = {
@@ -17,11 +18,12 @@ const CATEGORY_META: Record<string, { label: string; tone: string }> = {
   rating: { label: "评分", tone: "bg-violet-500/10 text-violet-700" },
   pk: { label: "训练 PK", tone: "bg-orange-500/10 text-orange-700" },
   plan: { label: "计划匹配", tone: "bg-cyan-500/10 text-cyan-700" },
+  tutorial: { label: "教程路径", tone: "bg-violet-500/10 text-violet-700" },
 };
 
 function getProgressText(item: any) {
   if (item.unlockedAt) {
-    return `已于 ${new Date(item.unlockedAt).toLocaleDateString("zh-CN")} 解锁`;
+    return `已于 ${formatDateShanghai(item.unlockedAt)} 解锁`;
   }
   return `${Math.round(item.currentValue || 0)} / ${Math.round(item.targetValue || 0)}`;
 }
diff --git a/client/src/pages/Dashboard.tsx b/client/src/pages/Dashboard.tsx
index 4cd4fbc..5a7de01 100644
--- a/client/src/pages/Dashboard.tsx
+++ b/client/src/pages/Dashboard.tsx
@@ -6,6 +6,7 @@ import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { Progress } from "@/components/ui/progress";
 import { Skeleton } from "@/components/ui/skeleton";
+import { formatDateTimeShanghai } from "@/lib/time";
 import { Activity, Award, ChevronRight, Clock3, Sparkles, Swords, Target, Video } from "lucide-react";
 import { useLocation } from "wouter";
 
@@ -199,7 +200,7 @@ export default function Dashboard() {
                     <div className="flex items-center justify-between gap-3">
                       <div>
                         <div className="font-medium">{session.title}</div>
-                        <div className="mt-1 text-xs text-muted-foreground">{new Date(session.createdAt).toLocaleString("zh-CN")}</div>
+                        <div className="mt-1 text-xs text-muted-foreground">{formatDateTimeShanghai(session.createdAt)}</div>
                       </div>
                       <Badge variant="outline">{Math.round(session.overallScore || 0)} 分</Badge>
                     </div>
diff --git a/client/src/pages/LiveCamera.tsx b/client/src/pages/LiveCamera.tsx
index 1546a9c..2b51bb7 100644
--- a/client/src/pages/LiveCamera.tsx
+++ b/client/src/pages/LiveCamera.tsx
@@ -7,6 +7,7 @@ import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, D
 import { Progress } from "@/components/ui/progress";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Slider } from "@/components/ui/slider";
+import { formatDateTimeShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import { applyTrackZoom, type CameraQualityPreset, getCameraVideoConstraints, getLiveAnalysisBitrate, readTrackZoomState } from "@/lib/camera";
 import {
@@ -910,7 +911,10 @@ export default function LiveCamera() {
       const format = recorderMimeTypeRef.current.includes("mp4") ? "mp4" : "webm";
       const fileBase64 = await blobToBase64(recordedBlob);
       uploadedVideo = await uploadMutation.mutateAsync({
-        title: `实时分析 ${new Date().toLocaleString("zh-CN", { month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit" })}`,
+        title: `实时分析 ${formatDateTimeShanghai(new Date(), {
+          year: undefined,
+          second: undefined,
+        })}`,
         format,
         fileSize: recordedBlob.size,
         exerciseType: dominantAction,
@@ -1605,7 +1609,7 @@ export default function LiveCamera() {
                       <div>
                         <div className="font-medium">{session.title}</div>
                         <div className="mt-1 text-xs text-muted-foreground">
-                          {new Date(session.createdAt).toLocaleString("zh-CN")}
+                          {formatDateTimeShanghai(session.createdAt)}
                         </div>
                       </div>
                       <Badge className={ACTION_META[(session.dominantAction as ActionType) || "unknown"].tone}>
diff --git a/client/src/pages/Logs.tsx b/client/src/pages/Logs.tsx
index b39e148..dbc5893 100644
--- a/client/src/pages/Logs.tsx
+++ b/client/src/pages/Logs.tsx
@@ -7,6 +7,7 @@ import { Button } from "@/components/ui/button";
 import { Skeleton } from "@/components/ui/skeleton";
 import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { ScrollArea } from "@/components/ui/scroll-area";
+import { formatDateTimeShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import { AlertTriangle, BellRing, CheckCircle2, ClipboardList, Loader2, RefreshCcw } from "lucide-react";
 
@@ -155,7 +156,7 @@ export default function Logs() {
                         <div className="space-y-1">
                           <CardTitle className="text-base">{task.title}</CardTitle>
                           <CardDescription>
-                            {new Date(task.createdAt).toLocaleString("zh-CN")} · {task.type}
+                            {formatDateTimeShanghai(task.createdAt)} · {task.type}
                           </CardDescription>
                         </div>
                         <Badge variant={task.status === "failed" ? "destructive" : "secondary"}>
@@ -233,7 +234,7 @@ export default function Logs() {
                         <div className="space-y-1">
                           <CardTitle className="text-base">{item.title}</CardTitle>
                           <CardDescription>
-                            {new Date(item.createdAt).toLocaleString("zh-CN")} · {item.notificationType}
+                            {formatDateTimeShanghai(item.createdAt)} · {item.notificationType}
                           </CardDescription>
                         </div>
                         <Badge variant={item.isRead ? "secondary" : "outline"}>
diff --git a/client/src/pages/Progress.tsx b/client/src/pages/Progress.tsx
index f07746e..8c109ac 100644
--- a/client/src/pages/Progress.tsx
+++ b/client/src/pages/Progress.tsx
@@ -4,7 +4,9 @@ import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/com
 import { Badge } from "@/components/ui/badge";
 import { Skeleton } from "@/components/ui/skeleton";
 import { Button } from "@/components/ui/button";
-import { Activity, Calendar, CheckCircle2, Clock, TrendingUp, Target, Sparkles } from "lucide-react";
+import { Activity, Calendar, CheckCircle2, ChevronDown, ChevronUp, Clock, TrendingUp, Target, Sparkles } from "lucide-react";
+import { formatDateTimeShanghai, formatMonthDayShanghai } from "@/lib/time";
+import { useState } from "react";
 import {
   ResponsiveContainer, BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip,
   LineChart, Line, Legend
@@ -17,6 +19,7 @@ export default function Progress() {
   const { data: analyses } = trpc.analysis.list.useQuery();
   const { data: stats } = trpc.profile.stats.useQuery();
   const [, setLocation] = useLocation();
+  const [expandedRecordId, setExpandedRecordId] = useState<number | null>(null);
 
   if (isLoading) {
     return (
@@ -29,7 +32,7 @@ export default function Progress() {
   // Aggregate data by date for charts
   const dateMap = new Map<string, { date: string; sessions: number; minutes: number; avgScore: number; scores: number[] }>();
   (records || []).forEach((r: any) => {
-    const date = new Date(r.trainingDate || r.createdAt).toLocaleDateString("zh-CN", { month: "short", day: "numeric" });
+    const date = formatMonthDayShanghai(r.trainingDate || r.createdAt);
     const existing = dateMap.get(date) || { date, sessions: 0, minutes: 0, avgScore: 0, scores: [] };
     existing.sessions++;
     existing.minutes += r.durationMinutes || 0;
@@ -44,7 +47,7 @@ export default function Progress() {
 
   // Analysis score trend
   const scoreTrend = (analyses || []).map((a: any) => ({
-    date: new Date(a.createdAt).toLocaleDateString("zh-CN", { month: "short", day: "numeric" }),
+    date: formatMonthDayShanghai(a.createdAt),
     overall: Math.round(a.overallScore || 0),
     consistency: Math.round(a.strokeConsistency || 0),
     footwork: Math.round(a.footworkScore || 0),
@@ -179,32 +182,104 @@ export default function Progress() {
           {(records?.length || 0) > 0 ? (
             <div className="space-y-2">
               {(records || []).slice(0, 20).map((record: any) => (
-                <div key={record.id} className="flex items-center justify-between py-2 border-b last:border-0">
-                  <div className="flex items-center gap-3">
-                    <div className={`h-8 w-8 rounded-lg flex items-center justify-center ${
-                      record.completed ? "bg-green-50 text-green-600" : "bg-muted text-muted-foreground"
-                    }`}>
-                      {record.completed ? <CheckCircle2 className="h-4 w-4" /> : <Activity className="h-4 w-4" />}
+                <div key={record.id} className="border-b py-2 last:border-0">
+                  <div className="flex items-start justify-between gap-3">
+                    <div className="flex items-start gap-3">
+                      <div className={`mt-0.5 h-8 w-8 rounded-lg flex items-center justify-center ${
+                        record.completed ? "bg-green-50 text-green-600" : "bg-muted text-muted-foreground"
+                      }`}>
+                        {record.completed ? <CheckCircle2 className="h-4 w-4" /> : <Activity className="h-4 w-4" />}
+                      </div>
+                      <div>
+                        <p className="text-sm font-medium">{record.exerciseName}</p>
+                        <p className="text-xs text-muted-foreground">
+                          {formatDateTimeShanghai(record.trainingDate || record.createdAt)}
+                          {record.durationMinutes ? ` · ${record.durationMinutes}分钟` : ""}
+                          {record.sourceType ? ` · ${record.sourceType}` : ""}
+                        </p>
+                        {record.actionCount ? (
+                          <p className="mt-1 text-xs text-muted-foreground">
+                            动作数 {record.actionCount}
+                          </p>
+                        ) : null}
+                      </div>
                     </div>
-                    <div>
-                      <p className="text-sm font-medium">{record.exerciseName}</p>
-                      <p className="text-xs text-muted-foreground">
-                        {new Date(record.trainingDate || record.createdAt).toLocaleDateString("zh-CN")}
-                        {record.durationMinutes ? ` · ${record.durationMinutes}分钟` : ""}
-                        {record.sourceType ? ` · ${record.sourceType}` : ""}
-                      </p>
+                    <div className="flex items-center gap-2">
+                      {record.poseScore && (
+                        <Badge variant="secondary" className="text-xs">{Math.round(record.poseScore)}分</Badge>
+                      )}
+                      {record.completed ? (
+                        <Badge className="bg-green-100 text-green-700 text-xs">已完成</Badge>
+                      ) : (
+                        <Badge variant="outline" className="text-xs">进行中</Badge>
+                      )}
+                      <Button
+                        variant="ghost"
+                        size="sm"
+                        onClick={() => setExpandedRecordId((current) => current === record.id ? null : record.id)}
+                      >
+                        {expandedRecordId === record.id ? <ChevronUp className="h-4 w-4" /> : <ChevronDown className="h-4 w-4" />}
+                      </Button>
                     </div>
                   </div>
-                  <div className="flex items-center gap-2">
-                    {record.poseScore && (
-                      <Badge variant="secondary" className="text-xs">{Math.round(record.poseScore)}分</Badge>
-                    )}
-                    {record.completed ? (
-                      <Badge className="bg-green-100 text-green-700 text-xs">已完成</Badge>
-                    ) : (
-                      <Badge variant="outline" className="text-xs">进行中</Badge>
-                    )}
-                  </div>
+
+                  {expandedRecordId === record.id ? (
+                    <div className="mt-3 rounded-2xl border border-border/60 bg-muted/20 p-4 text-sm">
+                      <div className="grid gap-3 md:grid-cols-2">
+                        <div>
+                          <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">记录时间</div>
+                          <div className="mt-1 font-medium">{formatDateTimeShanghai(record.trainingDate || record.createdAt, { second: "2-digit" })}</div>
+                        </div>
+                        <div>
+                          <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">动作数据</div>
+                          <div className="mt-1 font-medium">动作数 {record.actionCount || 0}</div>
+                        </div>
+                      </div>
+
+                      {record.metadata ? (
+                        <div className="mt-4 space-y-3">
+                          {record.metadata.dominantAction ? (
+                            <div>
+                              <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">主动作</div>
+                              <div className="mt-1 font-medium">{String(record.metadata.dominantAction)}</div>
+                            </div>
+                          ) : null}
+
+                          {record.metadata.actionSummary && Object.keys(record.metadata.actionSummary).length > 0 ? (
+                            <div>
+                              <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">动作明细</div>
+                              <div className="mt-2 flex flex-wrap gap-2">
+                                {Object.entries(record.metadata.actionSummary as Record<string, number>)
+                                  .filter(([, count]) => Number(count) > 0)
+                                  .map(([actionType, count]) => (
+                                    <Badge key={actionType} variant="secondary">
+                                      {actionType} {count} 次
+                                    </Badge>
+                                  ))}
+                              </div>
+                            </div>
+                          ) : null}
+
+                          {record.metadata.validityStatus ? (
+                            <div>
+                              <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">录制有效性</div>
+                              <div className="mt-1 font-medium">{String(record.metadata.validityStatus)}</div>
+                              {record.metadata.invalidReason ? (
+                                <div className="mt-1 text-xs text-muted-foreground">{String(record.metadata.invalidReason)}</div>
+                              ) : null}
+                            </div>
+                          ) : null}
+
+                          {record.notes ? (
+                            <div>
+                              <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">备注</div>
+                              <div className="mt-1 text-sm text-muted-foreground">{record.notes}</div>
+                            </div>
+                          ) : null}
+                        </div>
+                      ) : null}
+                    </div>
+                  ) : null}
                 </div>
               ))}
             </div>
diff --git a/client/src/pages/Rating.tsx b/client/src/pages/Rating.tsx
index 939dd3f..890209d 100644
--- a/client/src/pages/Rating.tsx
+++ b/client/src/pages/Rating.tsx
@@ -6,6 +6,7 @@ import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/com
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { Skeleton } from "@/components/ui/skeleton";
 import { useBackgroundTask } from "@/hooks/useBackgroundTask";
+import { formatDateTimeShanghai, formatMonthDayShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import { Activity, Award, Loader2, RefreshCw, Radar, TrendingUp } from "lucide-react";
 import {
@@ -69,7 +70,7 @@ export default function Rating() {
 
   const trendData = useMemo(
     () => history.map((item: any) => ({
-      date: new Date(item.createdAt).toLocaleDateString("zh-CN", { month: "short", day: "numeric" }),
+      date: formatMonthDayShanghai(item.createdAt),
       rating: item.rating,
     })).reverse(),
     [history],
@@ -131,7 +132,7 @@ export default function Rating() {
                   {latestSnapshot?.triggerType ? <Badge variant="outline">来源 {latestSnapshot.triggerType}</Badge> : null}
                   {latestSnapshot?.createdAt ? (
                     <Badge variant="outline">
-                      刷新于 {new Date(latestSnapshot.createdAt).toLocaleString("zh-CN")}
+                      刷新于 {formatDateTimeShanghai(latestSnapshot.createdAt)}
                     </Badge>
                   ) : null}
                 </div>
@@ -252,7 +253,7 @@ export default function Rating() {
                       <span className="font-medium">NTRP {Number(item.rating || 0).toFixed(1)}</span>
                       <Badge variant="outline">{item.triggerType}</Badge>
                     </div>
-                    <div className="mt-1 text-xs text-muted-foreground">{new Date(item.createdAt).toLocaleString("zh-CN")}</div>
+                    <div className="mt-1 text-xs text-muted-foreground">{formatDateTimeShanghai(item.createdAt)}</div>
                   </div>
                   <div className="flex items-center gap-4 text-sm text-muted-foreground">
                     <span className="inline-flex items-center gap-1">
diff --git a/client/src/pages/Recorder.tsx b/client/src/pages/Recorder.tsx
index 370fbc2..b91a092 100644
--- a/client/src/pages/Recorder.tsx
+++ b/client/src/pages/Recorder.tsx
@@ -23,7 +23,16 @@ import { Slider } from "@/components/ui/slider";
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { useBackgroundTask } from "@/hooks/useBackgroundTask";
 import { toast } from "sonner";
+import {
+  ACTION_LABELS as RECOGNIZED_ACTION_LABELS,
+  type ActionObservation,
+  type ActionType,
+  type TrackingState,
+  recognizeActionFrame,
+  stabilizeActionFrame,
+} from "@/lib/actionRecognition";
 import { applyTrackZoom, getCameraVideoConstraints, readTrackZoomState } from "@/lib/camera";
+import { formatDateTimeShanghai } from "@/lib/time";
 import {
   Activity,
   Camera,
@@ -68,6 +77,8 @@ const SEGMENT_LENGTH_MS = 60_000;
 const MOTION_SAMPLE_MS = 1_500;
 const MOTION_THRESHOLD = 18;
 const MOTION_COOLDOWN_MS = 8_000;
+const ACTION_SAMPLE_MS = 2_500;
+const INVALID_RECORDING_WINDOW_MS = 60_000;
 
 const QUALITY_PRESETS = {
   economy: {
@@ -151,6 +162,30 @@ function formatFileSize(bytes: number) {
   return `${(bytes / 1024 / 1024).toFixed(bytes > 20 * 1024 * 1024 ? 1 : 2)} MB`;
 }
 
+function createActionSummary(): Record<ActionType, number> {
+  return {
+    forehand: 0,
+    backhand: 0,
+    serve: 0,
+    volley: 0,
+    overhead: 0,
+    slice: 0,
+    lob: 0,
+    unknown: 0,
+  };
+}
+
+function summarizeActions(actionSummary: Record<ActionType, number>) {
+  return Object.entries(actionSummary)
+    .filter(([actionType, count]) => actionType !== "unknown" && count > 0)
+    .sort((left, right) => right[1] - left[1])
+    .map(([actionType, count]) => ({
+      actionType: actionType as ActionType,
+      label: RECOGNIZED_ACTION_LABELS[actionType as ActionType] || actionType,
+      count,
+    }));
+}
+
 export default function Recorder() {
   const { user } = useAuth();
   const utils = trpc.useUtils();
@@ -170,11 +205,22 @@ export default function Recorder() {
   const streamRef = useRef<MediaStream | null>(null);
   const recorderRef = useRef<MediaRecorder | null>(null);
   const peerRef = useRef<RTCPeerConnection | null>(null);
+  const actionPoseRef = useRef<any>(null);
   const currentSegmentStartedAtRef = useRef<number>(0);
   const recordingStartedAtRef = useRef<number>(0);
   const segmentSequenceRef = useRef(0);
   const motionFrameRef = useRef<Uint8ClampedArray | null>(null);
   const lastMotionMarkerAtRef = useRef(0);
+  const actionTickerRef = useRef<ReturnType<typeof setInterval> | null>(null);
+  const actionFrameInFlightRef = useRef(false);
+  const actionTrackingRef = useRef<TrackingState>({});
+  const actionHistoryRef = useRef<ActionObservation[]>([]);
+  const actionSummaryRef = useRef<Record<ActionType, number>>(createActionSummary());
+  const lastRecognizedActionAtRef = useRef<number>(0);
+  const lastActionMarkerAtRef = useRef<number>(0);
+  const latestRecognizedActionRef = useRef<ActionType>("unknown");
+  const validityOverrideRef = useRef<"valid" | "invalid" | null>(null);
+  const invalidAutoMarkedRef = useRef(false);
   const pendingUploadsRef = useRef<PendingSegment[]>([]);
   const uploadInFlightRef = useRef(false);
   const currentSessionRef = useRef<MediaSession | null>(null);
@@ -202,13 +248,17 @@ export default function Recorder() {
   const [uploadedSegments, setUploadedSegments] = useState(0);
   const [uploadBytes, setUploadBytes] = useState(0);
   const [cameraError, setCameraError] = useState("");
-  const [title, setTitle] = useState(() => `训练录制 ${new Date().toLocaleString("zh-CN", { month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit" })}`);
+  const [title, setTitle] = useState(() => `训练录制 ${formatDateTimeShanghai(new Date(), { year: undefined, second: undefined })}`);
   const [mediaSession, setMediaSession] = useState<MediaSession | null>(null);
   const [markers, setMarkers] = useState<MediaMarker[]>([]);
   const [connectionState, setConnectionState] = useState<RTCPeerConnectionState>("new");
   const [immersivePreview, setImmersivePreview] = useState(false);
   const [archiveTaskId, setArchiveTaskId] = useState<string | null>(null);
   const [zoomState, setZoomState] = useState(() => readTrackZoomState(null));
+  const [actionSummary, setActionSummary] = useState<Record<ActionType, number>>(() => createActionSummary());
+  const [currentDetectedAction, setCurrentDetectedAction] = useState<ActionType>("unknown");
+  const [recordingValidity, setRecordingValidity] = useState<"pending" | "valid" | "invalid">("pending");
+  const [recordingValidityReason, setRecordingValidityReason] = useState("");
 
   const mobile = useMemo(() => isMobileDevice(), []);
   const mimeType = useMemo(() => pickRecorderMimeType(), []);
@@ -224,6 +274,7 @@ export default function Recorder() {
     mediaSession?.archiveStatus === "queued" ||
     mediaSession?.archiveStatus === "processing";
   const canLeaveRecorderPage = !uploadStillDraining && (archiveRunning || mode === "archived");
+  const recognizedActionItems = useMemo(() => summarizeActions(actionSummary), [actionSummary]);
 
   const syncSessionState = useCallback((session: MediaSession | null) => {
     currentSessionRef.current = session;
@@ -273,9 +324,11 @@ export default function Recorder() {
     if (segmentTickerRef.current) clearInterval(segmentTickerRef.current);
     if (timerTickerRef.current) clearInterval(timerTickerRef.current);
     if (motionTickerRef.current) clearInterval(motionTickerRef.current);
+    if (actionTickerRef.current) clearInterval(actionTickerRef.current);
     segmentTickerRef.current = null;
     timerTickerRef.current = null;
     motionTickerRef.current = null;
+    actionTickerRef.current = null;
   }, []);
 
   const closePeer = useCallback(() => {
@@ -479,7 +532,11 @@ export default function Recorder() {
     await stopped;
   }, [stopTickers]);
 
-  const createManualMarker = useCallback(async (type: "manual" | "motion", label: string, confidence?: number) => {
+  const createManualMarker = useCallback(async (
+    type: "manual" | "motion" | "action_detected" | "invalid_auto" | "invalid_manual" | "valid_manual",
+    label: string,
+    confidence?: number,
+  ) => {
     const sessionId = currentSessionRef.current?.id;
     if (!sessionId) return;
 
@@ -508,6 +565,132 @@ export default function Recorder() {
     }
   }, [syncSessionState]);
 
+  const setValidityState = useCallback((
+    nextStatus: "pending" | "valid" | "invalid",
+    reason: string,
+    override: "valid" | "invalid" | null = validityOverrideRef.current,
+  ) => {
+    validityOverrideRef.current = override;
+    setRecordingValidity(nextStatus);
+    setRecordingValidityReason(reason);
+  }, []);
+
+  const startActionSampling = useCallback(async () => {
+    if (typeof window === "undefined") return;
+    const liveVideo = liveVideoRef.current;
+    if (!liveVideo) return;
+
+    if (!actionPoseRef.current) {
+      const testFactory = (
+        window as typeof window & {
+          __TEST_MEDIAPIPE_FACTORY__?: () => Promise<{ Pose: any }>;
+        }
+      ).__TEST_MEDIAPIPE_FACTORY__;
+      const { Pose } = testFactory ? await testFactory() : await import("@mediapipe/pose");
+      const pose = new Pose({
+        locateFile: (file: string) => `https://cdn.jsdelivr.net/npm/@mediapipe/pose/${file}`,
+      });
+      pose.setOptions({
+        modelComplexity: 0,
+        smoothLandmarks: true,
+        enableSegmentation: false,
+        minDetectionConfidence: 0.5,
+        minTrackingConfidence: 0.5,
+      });
+      pose.onResults((results: { poseLandmarks?: Array<{ x: number; y: number; visibility?: number }> }) => {
+        if (!results.poseLandmarks) {
+          return;
+        }
+
+        const analyzed = stabilizeActionFrame(
+          recognizeActionFrame(results.poseLandmarks, actionTrackingRef.current, performance.now()),
+          actionHistoryRef.current,
+        );
+        setCurrentDetectedAction(analyzed.action);
+
+        if (analyzed.action === "unknown" || analyzed.confidence < 0.55) {
+          return;
+        }
+
+        latestRecognizedActionRef.current = analyzed.action;
+        lastRecognizedActionAtRef.current = Date.now();
+        actionSummaryRef.current = {
+          ...actionSummaryRef.current,
+          [analyzed.action]: (actionSummaryRef.current[analyzed.action] || 0) + 1,
+        };
+        setActionSummary({ ...actionSummaryRef.current });
+
+        if (validityOverrideRef.current !== "invalid") {
+          setValidityState("valid", `已识别到 ${RECOGNIZED_ACTION_LABELS[analyzed.action]}`, validityOverrideRef.current);
+        }
+
+        if (Date.now() - lastActionMarkerAtRef.current >= 15_000) {
+          lastActionMarkerAtRef.current = Date.now();
+          void createManualMarker("action_detected", `识别到${RECOGNIZED_ACTION_LABELS[analyzed.action]}`, analyzed.confidence);
+        }
+      });
+      actionPoseRef.current = pose;
+    }
+
+    const checkInvalidWindow = () => {
+      const elapsedMs = Date.now() - recordingStartedAtRef.current;
+      if (elapsedMs < INVALID_RECORDING_WINDOW_MS || invalidAutoMarkedRef.current) {
+        return;
+      }
+      if (Date.now() - lastRecognizedActionAtRef.current < INVALID_RECORDING_WINDOW_MS) {
+        return;
+      }
+      invalidAutoMarkedRef.current = true;
+      setValidityState("invalid", "连续 60 秒未识别到有效动作，已自动标记为无效录制", validityOverrideRef.current);
+      void createManualMarker("invalid_auto", "连续60秒未识别到有效动作，自动标记为无效录制");
+    };
+
+    actionTickerRef.current = setInterval(() => {
+      const video = liveVideoRef.current;
+      if (!video || video.readyState < 2 || !actionPoseRef.current || actionFrameInFlightRef.current) {
+        checkInvalidWindow();
+        return;
+      }
+
+      actionFrameInFlightRef.current = true;
+      actionPoseRef.current.send({ image: video })
+        .catch(() => undefined)
+        .finally(() => {
+          actionFrameInFlightRef.current = false;
+          checkInvalidWindow();
+        });
+    }, ACTION_SAMPLE_MS);
+  }, [createManualMarker, setValidityState]);
+
+  const stopActionSampling = useCallback(async () => {
+    if (actionTickerRef.current) {
+      clearInterval(actionTickerRef.current);
+      actionTickerRef.current = null;
+    }
+    if (actionPoseRef.current?.close) {
+      try {
+        await actionPoseRef.current.close();
+      } catch {
+        // ignore pose teardown failures during recorder stop/reset
+      }
+    }
+    actionPoseRef.current = null;
+    actionFrameInFlightRef.current = false;
+  }, []);
+
+  const updateRecordingValidity = useCallback(async (next: "valid" | "invalid") => {
+    validityOverrideRef.current = next;
+    if (next === "valid") {
+      setValidityState("valid", "已手工恢复为有效录制", "valid");
+      invalidAutoMarkedRef.current = false;
+      await createManualMarker("valid_manual", "手工恢复为有效录制");
+      return;
+    }
+
+    setValidityState("invalid", "已手工标记为无效录制", "invalid");
+    await createManualMarker("invalid_manual", "手工标记为无效录制");
+  }, [createManualMarker, setValidityState]);
+
   const sampleMotion = useCallback(() => {
     const video = liveVideoRef.current;
     const canvas = motionCanvasRef.current;
@@ -680,11 +863,22 @@ export default function Recorder() {
       segmentSequenceRef.current = 0;
       motionFrameRef.current = null;
       pendingUploadsRef.current = [];
+      actionTrackingRef.current = {};
+      actionHistoryRef.current = [];
+      actionSummaryRef.current = createActionSummary();
+      setActionSummary(createActionSummary());
+      setCurrentDetectedAction("unknown");
+      setRecordingValidity("pending");
+      setRecordingValidityReason("正在抽样动作帧，持续 60 秒未识别到有效动作将自动标记无效。");
+      validityOverrideRef.current = null;
+      invalidAutoMarkedRef.current = false;
+      latestRecognizedActionRef.current = "unknown";
+      lastActionMarkerAtRef.current = 0;
 
       const stream = await ensurePreviewStream();
       const sessionResponse = await createMediaSession({
         userId: String(user.id),
-        title: title.trim() || `训练录制 ${new Date().toLocaleString("zh-CN")}`,
+        title: title.trim() || `训练录制 ${formatDateTimeShanghai(new Date())}`,
         format: "webm",
         mimeType,
         qualityPreset,
@@ -695,14 +889,16 @@ export default function Recorder() {
       await startRealtimePush(stream, sessionResponse.session.id);
 
       recordingStartedAtRef.current = Date.now();
+      lastRecognizedActionAtRef.current = recordingStartedAtRef.current;
       startRecorderLoop(stream);
+      await startActionSampling();
       setMode("recording");
       toast.success("录制已开始，已同步启动实时推流");
     } catch (error: any) {
       setMode("idle");
       toast.error(`启动录制失败: ${error?.message || "未知错误"}`);
     }
-  }, [ensurePreviewStream, facingMode, mimeType, mobile, qualityPreset, startRealtimePush, startRecorderLoop, syncSessionState, title, user]);
+  }, [ensurePreviewStream, facingMode, mimeType, mobile, qualityPreset, startActionSampling, startRealtimePush, startRecorderLoop, syncSessionState, title, user]);
 
   const finishRecording = useCallback(async () => {
     const session = currentSessionRef.current;
@@ -712,6 +908,7 @@ export default function Recorder() {
 
     try {
       setMode("finalizing");
+      await stopActionSampling();
       await stopRecorder();
       await flushPendingSegments();
       closePeer();
@@ -728,13 +925,25 @@ export default function Recorder() {
         exerciseType: "recording",
         sessionMode,
         durationMinutes: Math.max(1, Math.round((Date.now() - recordingStartedAtRef.current) / 60000)),
+        actionCount: Object.entries(actionSummaryRef.current)
+          .filter(([actionType]) => actionType !== "unknown")
+          .reduce((sum, [, count]) => sum + count, 0),
+        actionSummary: actionSummaryRef.current,
+        dominantAction: latestRecognizedActionRef.current !== "unknown" ? latestRecognizedActionRef.current : undefined,
+        validityStatus:
+          recordingValidity === "invalid"
+            ? validityOverrideRef.current === "invalid" ? "invalid_manual" : "invalid_auto"
+            : recordingValidity === "valid"
+              ? validityOverrideRef.current === "valid" ? "valid_manual" : "valid"
+              : "pending",
+        invalidReason: recordingValidity === "invalid" ? recordingValidityReason : undefined,
       });
       toast.success("录制已提交，后台正在整理回放文件");
     } catch (error: any) {
       toast.error(`结束录制失败: ${error?.message || "未知错误"}`);
       setMode("recording");
     }
-  }, [closePeer, finalizeTaskMutation, flushPendingSegments, sessionMode, stopCamera, stopRecorder, syncSessionState, title]);
+  }, [closePeer, finalizeTaskMutation, flushPendingSegments, recordingValidity, recordingValidityReason, sessionMode, stopActionSampling, stopCamera, stopRecorder, syncSessionState, title]);
 
   const resetRecorder = useCallback(async () => {
     if (reconnectTimeoutRef.current) clearTimeout(reconnectTimeoutRef.current);
@@ -745,10 +954,18 @@ export default function Recorder() {
     pendingUploadsRef.current = [];
     uploadInFlightRef.current = false;
     motionFrameRef.current = null;
+    await stopActionSampling().catch(() => {});
+    actionTrackingRef.current = {};
+    actionHistoryRef.current = [];
+    actionSummaryRef.current = createActionSummary();
     currentSessionRef.current = null;
     setArchiveTaskId(null);
     setMediaSession(null);
     setMarkers([]);
+    setActionSummary(createActionSummary());
+    setCurrentDetectedAction("unknown");
+    setRecordingValidity("pending");
+    setRecordingValidityReason("");
     setDurationMs(0);
     setQueuedSegments(0);
     setQueuedBytes(0);
@@ -758,7 +975,7 @@ export default function Recorder() {
     setConnectionState("new");
     setCameraError("");
     setMode("idle");
-  }, [closePeer, stopCamera, stopRecorder, stopTickers]);
+  }, [closePeer, stopActionSampling, stopCamera, stopRecorder, stopTickers]);
 
   const flipCamera = useCallback(async () => {
     const nextFacingMode = facingMode === "user" ? "environment" : "user";
@@ -844,6 +1061,7 @@ export default function Recorder() {
     return () => {
       if (reconnectTimeoutRef.current) clearTimeout(reconnectTimeoutRef.current);
       stopTickers();
+      void stopActionSampling();
       if (recorderRef.current && recorderRef.current.state !== "inactive") {
         try {
           recorderRef.current.stop();
@@ -856,7 +1074,7 @@ export default function Recorder() {
         streamRef.current.getTracks().forEach((track) => track.stop());
       }
     };
-  }, [closePeer, stopTickers]);
+  }, [closePeer, stopActionSampling, stopTickers]);
 
   const statusBadge = useMemo(() => {
     if (mode === "finalizing") {
@@ -1333,6 +1551,53 @@ export default function Recorder() {
                 </div>
               </div>
 
+              <div className="grid grid-cols-2 gap-3">
+                <div className="rounded-2xl bg-muted/35 p-4">
+                  <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">动作有效性</div>
+                  <div className="mt-2 text-sm font-medium">
+                    {recordingValidity === "valid" ? "有效录制" : recordingValidity === "invalid" ? "无效录制" : "待判定"}
+                  </div>
+                  <div className="mt-2 text-xs leading-5 text-muted-foreground">
+                    {recordingValidityReason || "录制中会自动抽样动作帧并进行判定。"}
+                  </div>
+                </div>
+                <div className="rounded-2xl bg-muted/35 p-4">
+                  <div className="text-xs uppercase tracking-[0.16em] text-muted-foreground">当前识别动作</div>
+                  <div className="mt-2 text-sm font-medium">
+                    {RECOGNIZED_ACTION_LABELS[currentDetectedAction] || "未知动作"}
+                  </div>
+                  <div className="mt-2 text-xs leading-5 text-muted-foreground">
+                    每 {Math.round(ACTION_SAMPLE_MS / 1000)} 秒抽样动作帧；连续 {Math.round(INVALID_RECORDING_WINDOW_MS / 1000)} 秒无有效动作会自动标记无效。
+                  </div>
+                </div>
+              </div>
+
+              <div className="flex flex-wrap gap-2">
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={() => void updateRecordingValidity("valid")}
+                  disabled={!currentSessionRef.current}
+                >
+                  手工恢复有效
+                </Button>
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={() => void updateRecordingValidity("invalid")}
+                  disabled={!currentSessionRef.current}
+                >
+                  手工标记无效
+                </Button>
+                {mediaSession?.playback.previewUrl ? (
+                  <Button asChild variant="outline" size="sm">
+                    <a href={mediaSession.playback.previewUrl} target="_blank" rel="noreferrer">
+                      查看滚动预归档
+                    </a>
+                  </Button>
+                ) : null}
+              </div>
+
               <div className="space-y-2">
                 <div className="flex items-center justify-between text-sm">
                   <span>已上传文件</span>
@@ -1354,6 +1619,13 @@ export default function Recorder() {
                   <span>服务端状态</span>
                   <span className="font-medium">{mediaSession?.status || "idle"}</span>
                 </div>
+                <div className="flex items-center justify-between text-sm">
+                  <span>滚动预归档</span>
+                  <span className="font-medium">
+                    {mediaSession?.previewStatus || "idle"}
+                    {typeof mediaSession?.previewSegments === "number" ? ` · ${mediaSession.previewSegments} 段` : ""}
+                  </span>
+                </div>
               </div>
 
               {(mode === "finalizing" || mode === "archived" || mediaSession?.archiveStatus === "failed") && (
@@ -1404,6 +1676,19 @@ export default function Recorder() {
                 </div>
               )}
 
+              {recognizedActionItems.length > 0 ? (
+                <div className="rounded-2xl border border-border/60 bg-muted/25 p-4">
+                  <div className="text-sm font-medium">识别到的动作数据</div>
+                  <div className="mt-3 flex flex-wrap gap-2">
+                    {recognizedActionItems.map((item) => (
+                      <Badge key={item.actionType} variant="secondary">
+                        {item.label} {item.count} 次
+                      </Badge>
+                    ))}
+                  </div>
+                </div>
+              ) : null}
+
               {cameraError && (
                 <div className="rounded-2xl border border-destructive/20 bg-destructive/5 p-4 text-sm text-destructive">
                   {cameraError}
diff --git a/client/src/pages/Videos.tsx b/client/src/pages/Videos.tsx
index ebb4735..7953278 100644
--- a/client/src/pages/Videos.tsx
+++ b/client/src/pages/Videos.tsx
@@ -9,6 +9,7 @@ import { Skeleton } from "@/components/ui/skeleton";
 import { Slider } from "@/components/ui/slider";
 import { Textarea } from "@/components/ui/textarea";
 import { Input } from "@/components/ui/input";
+import { formatDateShanghai, formatDateTimeShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import {
   BarChart3,
@@ -145,7 +146,7 @@ function buildClipCueSheet(title: string, clips: ClipDraft[]) {
     `   时长: ${formatSeconds(Math.max(0, clip.endSec - clip.startSec))}\n` +
     `   来源: ${clip.source === "manual" ? "手动" : "分析建议"}\n` +
     `   备注: ${clip.notes || "无"}`
-  )).join("\n\n") + `\n\n视频: ${title}\n导出时间: ${new Date().toLocaleString("zh-CN")}\n`;
+  )).join("\n\n") + `\n\n视频: ${title}\n导出时间: ${formatDateTimeShanghai(new Date())}\n`;
 }
 
 function createEmptyVideoDraft(): VideoCreateDraft {
@@ -440,7 +441,7 @@ export default function Videos() {
                             ) : null}
                             <span className="inline-flex items-center gap-1 text-xs text-muted-foreground">
                               <Clock className="h-3 w-3" />
-                              {new Date(video.createdAt).toLocaleDateString("zh-CN")}
+                              {formatDateShanghai(video.createdAt)}
                             </span>
                             <span className="text-xs text-muted-foreground">
                               {((video.fileSize || 0) / 1024 / 1024).toFixed(1)}MB
diff --git a/client/src/pages/VisionLab.tsx b/client/src/pages/VisionLab.tsx
index dc18360..cda7af9 100644
--- a/client/src/pages/VisionLab.tsx
+++ b/client/src/pages/VisionLab.tsx
@@ -6,6 +6,7 @@ import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { Alert, AlertDescription, AlertTitle } from "@/components/ui/alert";
 import { Skeleton } from "@/components/ui/skeleton";
+import { formatDateTimeShanghai } from "@/lib/time";
 import { toast } from "sonner";
 import { useBackgroundTask } from "@/hooks/useBackgroundTask";
 import { Database, Image as ImageIcon, Loader2, Microscope, ShieldCheck, Sparkles } from "lucide-react";
@@ -358,7 +359,7 @@ export default function VisionLab() {
                           <Badge variant="outline">{run.exerciseType}</Badge>
                         </div>
                         <p className="text-xs text-muted-foreground">
-                          {new Date(run.createdAt).toLocaleString("zh-CN")}
+                          {formatDateTimeShanghai(run.createdAt)}
                           {user?.role === "admin" && run.userName ? ` · 提交人：${run.userName}` : ""}
                         </p>
                       </div>
diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 77a4adb..9806375 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,5 +1,29 @@
 # Tennis Training Hub - 变更日志
 
+## 2026.03.15-session-changelog (2026-03-15)
+
+### 功能更新
+
+- 用户名登录生成独立 `sid`，同一账号在多个设备或浏览器上下文中登录时不再互相顶掉 session
+- 新增应用内更新日志页面 `/changelog`，展示版本号、发布日期、仓库版本和测试记录
+- 训练进度页最近训练记录支持展开，展示具体上海时间、动作数、主动作、动作明细、录制有效性和备注
+- 录制页补齐动作抽样摘要、无效录制标记与 media 预归档状态的前端展示
+- Dashboard、任务中心、管理台、训练页、评分页、日志页、视觉测试页、视频库等高频页面统一使用 `Asia/Shanghai` 时间显示
+
+### 测试
+
+- `pnpm check`
+- `pnpm test`
+- `pnpm test:go`
+- `pnpm build`
+- Playwright 线上 smoke：
+  - `https://te.hao.work/` 使用两个浏览器上下文分别登录 `H1`，两端 dashboard 均保持有效
+  - 当前线上 `/changelog` 仍返回旧前端构建，待部署最新版本后需要复测该页面
+
+### 仓库版本
+
+- `pending-commit`
+
 ## v3.0.0 (2026-03-14)
 
 ### 新增功能
diff --git a/media/main.go b/media/main.go
index 1c12478..b54a5ea 100644
--- a/media/main.go
+++ b/media/main.go
@@ -44,6 +44,15 @@ const (
 	ArchiveFailed     ArchiveStatus = "failed"
 )
 
+type PreviewStatus string
+
+const (
+	PreviewIdle       PreviewStatus = "idle"
+	PreviewProcessing PreviewStatus = "processing"
+	PreviewReady      PreviewStatus = "ready"
+	PreviewFailed     PreviewStatus = "failed"
+)
+
 type PlaybackInfo struct {
 	WebMURL    string `json:"webmUrl,omitempty"`
 	MP4URL     string `json:"mp4Url,omitempty"`
@@ -77,6 +86,7 @@ type Session struct {
 	Title            string        `json:"title"`
 	Status           SessionStatus `json:"status"`
 	ArchiveStatus    ArchiveStatus `json:"archiveStatus"`
+	PreviewStatus    PreviewStatus `json:"previewStatus"`
 	Format           string        `json:"format"`
 	MimeType         string        `json:"mimeType"`
 	QualityPreset    string        `json:"qualityPreset"`
@@ -85,11 +95,13 @@ type Session struct {
 	ReconnectCount   int           `json:"reconnectCount"`
 	UploadedSegments int           `json:"uploadedSegments"`
 	UploadedBytes    int64         `json:"uploadedBytes"`
+	PreviewSegments  int           `json:"previewSegments"`
 	DurationMS       int64         `json:"durationMs"`
 	LastError        string        `json:"lastError,omitempty"`
 	CreatedAt        string        `json:"createdAt"`
 	UpdatedAt        string        `json:"updatedAt"`
 	FinalizedAt      string        `json:"finalizedAt,omitempty"`
+	PreviewUpdatedAt string        `json:"previewUpdatedAt,omitempty"`
 	StreamConnected  bool          `json:"streamConnected"`
 	LastStreamAt     string        `json:"lastStreamAt,omitempty"`
 	Playback         PlaybackInfo  `json:"playback"`
@@ -159,7 +171,7 @@ func newSessionStore(rootDir string) (*sessionStore, error) {
 	if err := os.MkdirAll(store.public, 0o755); err != nil {
 		return nil, err
 	}
-	if err := store.load(); err != nil {
+	if err := store.refreshFromDisk(); err != nil {
 		return nil, err
 	}
 	for _, session := range store.sessions {
@@ -168,12 +180,13 @@ func newSessionStore(rootDir string) (*sessionStore, error) {
 	return store, nil
 }
 
-func (s *sessionStore) load() error {
+func (s *sessionStore) loadSessionsFromDisk() (map[string]*Session, error) {
 	pattern := filepath.Join(s.rootDir, "sessions", "*", "session.json")
 	files, err := filepath.Glob(pattern)
 	if err != nil {
-		return err
+		return nil, err
 	}
+	sessions := make(map[string]*Session, len(files))
 	for _, file := range files {
 		body, readErr := os.ReadFile(file)
 		if readErr != nil {
@@ -183,8 +196,19 @@ func (s *sessionStore) load() error {
 		if unmarshalErr := json.Unmarshal(body, &session); unmarshalErr != nil {
 			continue
 		}
-		s.sessions[session.ID] = &session
+		sessions[session.ID] = &session
 	}
+	return sessions, nil
+}
+
+func (s *sessionStore) refreshFromDisk() error {
+	sessions, err := s.loadSessionsFromDisk()
+	if err != nil {
+		return err
+	}
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.sessions = sessions
 	return nil
 }
 
@@ -228,6 +252,7 @@ func (s *sessionStore) createSession(input CreateSessionRequest) (*Session, erro
 		Title:         strings.TrimSpace(input.Title),
 		Status:        StatusCreated,
 		ArchiveStatus: ArchiveIdle,
+		PreviewStatus: PreviewIdle,
 		Format:        defaultString(input.Format, "webm"),
 		MimeType:      defaultString(input.MimeType, "video/webm"),
 		QualityPreset: defaultString(input.QualityPreset, "balanced"),
@@ -295,13 +320,20 @@ func (s *sessionStore) updateSession(id string, update func(*Session) error) (*S
 	return cloneSession(session), nil
 }
 
-func (s *sessionStore) listFinalizingSessions() []*Session {
+func (s *sessionStore) listProcessableSessions() []*Session {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
 	items := make([]*Session, 0, len(s.sessions))
 	for _, session := range s.sessions {
+		if len(session.Segments) == 0 {
+			continue
+		}
 		if session.ArchiveStatus == ArchiveQueued || session.ArchiveStatus == ArchiveProcessing {
 			items = append(items, cloneSession(session))
+			continue
+		}
+		if session.PreviewSegments < len(session.Segments) && session.PreviewStatus != PreviewProcessing {
+			items = append(items, cloneSession(session))
 		}
 	}
 	return items
@@ -315,6 +347,10 @@ func newMediaServer(store *sessionStore) *mediaServer {
 	return &mediaServer{store: store}
 }
 
+func (m *mediaServer) refreshSessionsForRead() error {
+	return m.store.refreshFromDisk()
+}
+
 func (m *mediaServer) routes() http.Handler {
 	mux := http.NewServeMux()
 	mux.HandleFunc("/media/health", m.handleHealth)
@@ -359,6 +395,10 @@ func (m *mediaServer) handleSession(w http.ResponseWriter, r *http.Request) {
 	}
 	sessionID := parts[0]
 	if len(parts) == 1 && r.Method == http.MethodGet {
+		if err := m.refreshSessionsForRead(); err != nil {
+			writeError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
 		session, err := m.store.getSession(sessionID)
 		if err != nil {
 			writeError(w, http.StatusNotFound, err.Error())
@@ -402,6 +442,10 @@ func (m *mediaServer) handleSession(w http.ResponseWriter, r *http.Request) {
 			http.NotFound(w, r)
 			return
 		}
+		if err := m.refreshSessionsForRead(); err != nil {
+			writeError(w, http.StatusInternalServerError, err.Error())
+			return
+		}
 		session, err := m.store.getSession(sessionID)
 		if err != nil {
 			writeError(w, http.StatusNotFound, err.Error())
@@ -632,7 +676,11 @@ func runWorkerLoop(ctx context.Context, store *sessionStore, interval time.Durat
 		case <-ctx.Done():
 			return
 		case <-ticker.C:
-			sessions := store.listFinalizingSessions()
+			if err := store.refreshFromDisk(); err != nil {
+				log.Printf("[worker] failed to refresh session store: %v", err)
+				continue
+			}
+			sessions := store.listProcessableSessions()
 			for _, session := range sessions {
 				if err := processSession(store, session.ID); err != nil {
 					log.Printf("[worker] failed to process session %s: %v", session.ID, err)
@@ -643,6 +691,42 @@ func runWorkerLoop(ctx context.Context, store *sessionStore, interval time.Durat
 }
 
 func processSession(store *sessionStore, sessionID string) error {
+	current, err := store.getSession(sessionID)
+	if err != nil {
+		return err
+	}
+
+	if current.ArchiveStatus == ArchiveQueued || current.ArchiveStatus == ArchiveProcessing {
+		return processFinalArchive(store, sessionID)
+	}
+
+	if current.PreviewSegments < len(current.Segments) {
+		return processRollingPreview(store, sessionID)
+	}
+
+	return nil
+}
+
+func processRollingPreview(store *sessionStore, sessionID string) error {
+	session, err := store.updateSession(sessionID, func(session *Session) error {
+		if session.PreviewStatus == PreviewProcessing {
+			return errors.New("preview already processing")
+		}
+		session.PreviewStatus = PreviewProcessing
+		session.LastError = ""
+		return nil
+	})
+	if err != nil {
+		if strings.Contains(err.Error(), "preview already processing") {
+			return nil
+		}
+		return err
+	}
+
+	return buildPlaybackArtifacts(store, session, false)
+}
+
+func processFinalArchive(store *sessionStore, sessionID string) error {
 	session, err := store.updateSession(sessionID, func(session *Session) error {
 		if session.ArchiveStatus == ArchiveProcessing {
 			return errors.New("already processing")
@@ -668,12 +752,22 @@ func processSession(store *sessionStore, sessionID string) error {
 		return errors.New("no uploaded segments found")
 	}
 
+	return buildPlaybackArtifacts(store, session, true)
+}
+
+func buildPlaybackArtifacts(store *sessionStore, session *Session, finalize bool) error {
+	sessionID := session.ID
+
 	publicDir := store.publicDir(sessionID)
 	if err := os.MkdirAll(publicDir, 0o755); err != nil {
 		return err
 	}
-	outputWebM := filepath.Join(publicDir, "recording.webm")
-	outputMP4 := filepath.Join(publicDir, "recording.mp4")
+	baseName := "preview"
+	if finalize {
+		baseName = "recording"
+	}
+	outputWebM := filepath.Join(publicDir, baseName+".webm")
+	outputMP4 := filepath.Join(publicDir, baseName+".mp4")
 	listFile := filepath.Join(store.sessionDir(sessionID), "concat.txt")
 
 	inputs := make([]string, 0, len(session.Segments))
@@ -684,23 +778,23 @@ func processSession(store *sessionStore, sessionID string) error {
 		inputs = append(inputs, filepath.Join(store.segmentsDir(sessionID), segment.Filename))
 	}
 	if err := writeConcatList(listFile, inputs); err != nil {
-		return markArchiveError(store, sessionID, err)
+		return markProcessingError(store, sessionID, err, finalize)
 	}
 
 	if len(inputs) == 1 {
 		body, copyErr := os.ReadFile(inputs[0])
 		if copyErr != nil {
-			return markArchiveError(store, sessionID, copyErr)
+			return markProcessingError(store, sessionID, copyErr, finalize)
 		}
 		if writeErr := os.WriteFile(outputWebM, body, 0o644); writeErr != nil {
-			return markArchiveError(store, sessionID, writeErr)
+			return markProcessingError(store, sessionID, writeErr, finalize)
 		}
 	} else {
 		copyErr := runFFmpeg("-y", "-f", "concat", "-safe", "0", "-i", listFile, "-c", "copy", outputWebM)
 		if copyErr != nil {
 			reencodeErr := runFFmpeg("-y", "-f", "concat", "-safe", "0", "-i", listFile, "-c:v", "libvpx-vp9", "-b:v", "1800k", "-c:a", "libopus", outputWebM)
 			if reencodeErr != nil {
-				return markArchiveError(store, sessionID, fmt.Errorf("concat failed: %w / %v", copyErr, reencodeErr))
+				return markProcessingError(store, sessionID, fmt.Errorf("concat failed: %w / %v", copyErr, reencodeErr), finalize)
 			}
 		}
 	}
@@ -712,7 +806,7 @@ func processSession(store *sessionStore, sessionID string) error {
 
 	webmInfo, webmStatErr := os.Stat(outputWebM)
 	if webmStatErr != nil {
-		return markArchiveError(store, sessionID, webmStatErr)
+		return markProcessingError(store, sessionID, webmStatErr, finalize)
 	}
 	var mp4Size int64
 	var mp4URL string
@@ -720,27 +814,41 @@ func processSession(store *sessionStore, sessionID string) error {
 		mp4Size = info.Size()
 		mp4URL = fmt.Sprintf("/media/assets/sessions/%s/recording.mp4", sessionID)
 	}
-	_, err = store.updateSession(sessionID, func(session *Session) error {
-		session.ArchiveStatus = ArchiveCompleted
-		session.Status = StatusArchived
-		session.Playback = PlaybackInfo{
-			WebMURL:    fmt.Sprintf("/media/assets/sessions/%s/recording.webm", sessionID),
-			MP4URL:     mp4URL,
-			WebMSize:   webmInfo.Size(),
-			MP4Size:    mp4Size,
-			Ready:      true,
-			PreviewURL: fmt.Sprintf("/media/assets/sessions/%s/recording.webm", sessionID),
-		}
+	previewURL := fmt.Sprintf("/media/assets/sessions/%s/%s.webm", sessionID, baseName)
+	if mp4URL != "" {
+		previewURL = mp4URL
+	}
+
+	_, updateErr := store.updateSession(sessionID, func(session *Session) error {
+		session.Playback.PreviewURL = previewURL
+		session.PreviewSegments = len(inputs)
+		session.PreviewUpdatedAt = time.Now().UTC().Format(time.RFC3339)
+		session.PreviewStatus = PreviewReady
 		session.LastError = ""
+		if finalize {
+			session.ArchiveStatus = ArchiveCompleted
+			session.Status = StatusArchived
+			session.Playback = PlaybackInfo{
+				WebMURL:    fmt.Sprintf("/media/assets/sessions/%s/recording.webm", sessionID),
+				MP4URL:     mp4URL,
+				WebMSize:   webmInfo.Size(),
+				MP4Size:    mp4Size,
+				Ready:      true,
+				PreviewURL: previewURL,
+			}
+		}
 		return nil
 	})
-	return err
+	return updateErr
 }
 
-func markArchiveError(store *sessionStore, sessionID string, err error) error {
+func markProcessingError(store *sessionStore, sessionID string, err error, finalize bool) error {
 	_, _ = store.updateSession(sessionID, func(session *Session) error {
-		session.ArchiveStatus = ArchiveFailed
-		session.Status = StatusFailed
+		session.PreviewStatus = PreviewFailed
+		if finalize {
+			session.ArchiveStatus = ArchiveFailed
+			session.Status = StatusFailed
+		}
 		session.LastError = err.Error()
 		return nil
 	})
diff --git a/media/main_test.go b/media/main_test.go
index edba0a6..d1af01e 100644
--- a/media/main_test.go
+++ b/media/main_test.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -128,3 +129,130 @@ func TestProcessSessionArchivesPlayback(t *testing.T) {
 		t.Fatalf("expected webm playback url, got %#v", archived.Playback)
 	}
 }
+
+func TestRefreshFromDiskPicksUpSessionsCreatedAfterWorkerStartup(t *testing.T) {
+	tempDir := t.TempDir()
+
+	workerStore, err := newSessionStore(tempDir)
+	if err != nil {
+		t.Fatalf("newSessionStore(worker): %v", err)
+	}
+	if got := len(workerStore.listProcessableSessions()); got != 0 {
+		t.Fatalf("expected no processable sessions at startup, got %d", got)
+	}
+
+	appStore, err := newSessionStore(tempDir)
+	if err != nil {
+		t.Fatalf("newSessionStore(app): %v", err)
+	}
+
+	session, err := appStore.createSession(CreateSessionRequest{UserID: "1", Title: "Queued Session"})
+	if err != nil {
+		t.Fatalf("createSession: %v", err)
+	}
+	if err := os.WriteFile(filepath.Join(appStore.segmentsDir(session.ID), "000000.webm"), []byte("segment"), 0o644); err != nil {
+		t.Fatalf("write segment: %v", err)
+	}
+	if _, err := appStore.updateSession(session.ID, func(current *Session) error {
+		current.Segments = append(current.Segments, SegmentMeta{
+			Sequence:    0,
+			Filename:    "000000.webm",
+			DurationMS:  60000,
+			SizeBytes:   7,
+			ContentType: "video/webm",
+		})
+		current.ArchiveStatus = ArchiveQueued
+		current.Status = StatusFinalizing
+		return nil
+	}); err != nil {
+		t.Fatalf("updateSession: %v", err)
+	}
+
+	if err := workerStore.refreshFromDisk(); err != nil {
+		t.Fatalf("refreshFromDisk: %v", err)
+	}
+
+	processable := workerStore.listProcessableSessions()
+	if len(processable) != 1 {
+		t.Fatalf("expected worker to pick up queued session after refresh, got %d", len(processable))
+	}
+	if processable[0].ID != session.ID {
+		t.Fatalf("expected session %s, got %s", session.ID, processable[0].ID)
+	}
+}
+
+func TestHandleSessionGetRefreshesSessionStateFromDisk(t *testing.T) {
+	tempDir := t.TempDir()
+
+	serverStore, err := newSessionStore(tempDir)
+	if err != nil {
+		t.Fatalf("newSessionStore(server): %v", err)
+	}
+	server := newMediaServer(serverStore)
+
+	writerStore, err := newSessionStore(tempDir)
+	if err != nil {
+		t.Fatalf("newSessionStore(writer): %v", err)
+	}
+
+	session, err := writerStore.createSession(CreateSessionRequest{UserID: "1", Title: "Fresh Session"})
+	if err != nil {
+		t.Fatalf("createSession: %v", err)
+	}
+	if _, err := writerStore.updateSession(session.ID, func(current *Session) error {
+		current.Status = StatusFinalizing
+		current.ArchiveStatus = ArchiveQueued
+		return nil
+	}); err != nil {
+		t.Fatalf("queue session: %v", err)
+	}
+
+	getReq := httptest.NewRequest(http.MethodGet, "/media/sessions/"+session.ID, nil)
+	getRes := httptest.NewRecorder()
+	server.routes().ServeHTTP(getRes, getReq)
+	if getRes.Code != http.StatusOK {
+		t.Fatalf("expected get session 200, got %d", getRes.Code)
+	}
+
+	var queuedResponse struct {
+		Session Session `json:"session"`
+	}
+	if err := json.NewDecoder(getRes.Body).Decode(&queuedResponse); err != nil {
+		t.Fatalf("decode queued response: %v", err)
+	}
+	if queuedResponse.Session.ArchiveStatus != ArchiveQueued {
+		t.Fatalf("expected queued archive status, got %s", queuedResponse.Session.ArchiveStatus)
+	}
+
+	if _, err := writerStore.updateSession(session.ID, func(current *Session) error {
+		current.Status = StatusArchived
+		current.ArchiveStatus = ArchiveCompleted
+		current.Playback = PlaybackInfo{
+			WebMURL: "/media/assets/sessions/" + session.ID + "/recording.webm",
+			Ready:   true,
+		}
+		return nil
+	}); err != nil {
+		t.Fatalf("complete session: %v", err)
+	}
+
+	refreshReq := httptest.NewRequest(http.MethodGet, "/media/sessions/"+session.ID, nil)
+	refreshRes := httptest.NewRecorder()
+	server.routes().ServeHTTP(refreshRes, refreshReq)
+	if refreshRes.Code != http.StatusOK {
+		t.Fatalf("expected refreshed get session 200, got %d", refreshRes.Code)
+	}
+
+	var completedResponse struct {
+		Session Session `json:"session"`
+	}
+	if err := json.NewDecoder(refreshRes.Body).Decode(&completedResponse); err != nil {
+		t.Fatalf("decode completed response: %v", err)
+	}
+	if completedResponse.Session.ArchiveStatus != ArchiveCompleted {
+		t.Fatalf("expected completed archive status, got %s", completedResponse.Session.ArchiveStatus)
+	}
+	if !completedResponse.Session.Playback.Ready {
+		t.Fatalf("expected playback ready after refresh")
+	}
+}
diff --git a/server/_core/sdk.ts b/server/_core/sdk.ts
index 230e762..f1033d7 100644
--- a/server/_core/sdk.ts
+++ b/server/_core/sdk.ts
@@ -21,7 +21,8 @@ const isNonEmptyString = (value: unknown): value is string =>
 export type SessionPayload = {
   openId: string;
   appId: string;
-  name: string;
+  name?: string;
+  sid?: string;
 };
 
 const EXCHANGE_TOKEN_PATH = `/webdev.v1.WebDevAuthPublicService/ExchangeToken`;
@@ -173,6 +174,7 @@ class SDKServer {
         openId,
         appId: ENV.appId,
         name: options.name || "",
+        sid: crypto.randomUUID(),
       },
       options
     );
@@ -190,7 +192,8 @@ class SDKServer {
     return new SignJWT({
       openId: payload.openId,
       appId: payload.appId,
-      name: payload.name,
+      name: payload.name || "",
+      sid: payload.sid || crypto.randomUUID(),
     })
       .setProtectedHeader({ alg: "HS256", typ: "JWT" })
       .setExpirationTime(expirationSeconds)
@@ -199,7 +202,7 @@ class SDKServer {
 
   async verifySession(
     cookieValue: string | undefined | null
-  ): Promise<{ openId: string; appId: string; name: string } | null> {
+  ): Promise<{ openId: string; appId: string; name?: string; sid?: string } | null> {
     if (!cookieValue) {
       console.warn("[Auth] Missing session cookie");
       return null;
@@ -210,12 +213,11 @@ class SDKServer {
       const { payload } = await jwtVerify(cookieValue, secretKey, {
         algorithms: ["HS256"],
       });
-      const { openId, appId, name } = payload as Record<string, unknown>;
+      const { openId, appId, name, sid } = payload as Record<string, unknown>;
 
       if (
         !isNonEmptyString(openId) ||
-        !isNonEmptyString(appId) ||
-        !isNonEmptyString(name)
+        !isNonEmptyString(appId)
       ) {
         console.warn("[Auth] Session payload missing required fields");
         return null;
@@ -224,7 +226,8 @@ class SDKServer {
       return {
         openId,
         appId,
-        name,
+        name: typeof name === "string" ? name : undefined,
+        sid: typeof sid === "string" ? sid : undefined,
       };
     } catch (error) {
       console.warn("[Auth] Session verification failed", String(error));
diff --git a/server/mediaService.ts b/server/mediaService.ts
index 706a9c8..430c7ed 100644
--- a/server/mediaService.ts
+++ b/server/mediaService.ts
@@ -6,6 +6,16 @@ export type RemoteMediaSession = {
   userId: string;
   title: string;
   archiveStatus: "idle" | "queued" | "processing" | "completed" | "failed";
+  previewStatus?: "idle" | "processing" | "ready" | "failed";
+  previewSegments?: number;
+  markers?: Array<{
+    id: string;
+    type: string;
+    label: string;
+    timestampMs: number;
+    confidence?: number;
+    createdAt: string;
+  }>;
   playback: {
     webmUrl?: string;
     mp4Url?: string;
diff --git a/server/routers.ts b/server/routers.ts
index ba28eda..49333d7 100644
--- a/server/routers.ts
+++ b/server/routers.ts
@@ -664,6 +664,11 @@ export const appRouter = router({
         exerciseType: z.string().optional(),
         sessionMode: z.enum(["practice", "pk"]).default("practice"),
         durationMinutes: z.number().min(1).max(720).optional(),
+        actionCount: z.number().min(0).max(100000).optional(),
+        actionSummary: z.record(z.string(), z.number()).optional(),
+        dominantAction: z.string().optional(),
+        validityStatus: z.enum(["pending", "valid", "valid_manual", "invalid_auto", "invalid_manual"]).optional(),
+        invalidReason: z.string().max(512).optional(),
       }))
       .mutation(async ({ ctx, input }) => {
         return enqueueTask({
diff --git a/server/taskWorker.ts b/server/taskWorker.ts
index 98a0caa..2810494 100644
--- a/server/taskWorker.ts
+++ b/server/taskWorker.ts
@@ -34,8 +34,13 @@ type StructuredParams<T> = {
     };
   };
   parse: (content: unknown) => T;
+  timeoutMs?: number;
+  retryCount?: number;
 };
 
+const TRAINING_PLAN_LLM_TIMEOUT_MS = Math.max(ENV.llmTimeoutMs, 120_000);
+const TRAINING_PLAN_LLM_RETRY_COUNT = Math.max(ENV.llmRetryCount, 2);
+
 async function invokeStructured<T>(params: StructuredParams<T>) {
   let lastError: unknown;
 
@@ -56,6 +61,8 @@ async function invokeStructured<T>(params: StructuredParams<T>) {
       model: params.model,
       messages: [...params.baseMessages, ...retryHint],
       response_format: params.responseFormat,
+      timeoutMs: params.timeoutMs,
+      retryCount: params.retryCount,
     });
 
     try {
@@ -136,6 +143,17 @@ async function runTrainingPlanGenerateTask(task: NonNullable<TaskRow>) {
     durationDays: number;
     focusAreas?: string[];
   };
+  const user = await db.getUserById(task.userId);
+  if (!user) {
+    throw new Error("User not found");
+  }
+  const latestSnapshot = await db.getLatestNtrpSnapshot(task.userId);
+  const trainingProfileStatus = db.getTrainingProfileStatus(user, latestSnapshot);
+  if (!trainingProfileStatus.isComplete) {
+    const missingLabels = trainingProfileStatus.missingFields.map((field) => db.TRAINING_PROFILE_FIELD_LABELS[field]).join("、");
+    throw new Error(`训练计划生成前请先完善训练档案：${missingLabels}`);
+  }
+
   const analyses = await db.getUserAnalyses(task.userId);
   const recentScores = analyses.slice(0, 5).map((analysis) => ({
     score: analysis.overallScore ?? null,
@@ -154,6 +172,9 @@ async function runTrainingPlanGenerateTask(task: NonNullable<TaskRow>) {
         content: buildTrainingPlanPrompt({
           ...payload,
           recentScores,
+          effectiveNtrpRating: trainingProfileStatus.effectiveNtrp,
+          ntrpSource: trainingProfileStatus.ntrpSource,
+          assessmentSnapshot: trainingProfileStatus.assessmentSnapshot,
         }),
       },
     ],
@@ -194,6 +215,8 @@ async function runTrainingPlanGenerateTask(task: NonNullable<TaskRow>) {
       content,
       fallbackTitle: `${payload.durationDays}天训练计划`,
     }),
+    timeoutMs: TRAINING_PLAN_LLM_TIMEOUT_MS,
+    retryCount: TRAINING_PLAN_LLM_RETRY_COUNT,
   });
 
   const planId = await db.createTrainingPlan({
@@ -280,6 +303,8 @@ async function runTrainingPlanAdjustTask(task: NonNullable<TaskRow>) {
       content,
       fallbackTitle: currentPlan.title,
     }),
+    timeoutMs: TRAINING_PLAN_LLM_TIMEOUT_MS,
+    retryCount: TRAINING_PLAN_LLM_RETRY_COUNT,
   });
 
   await db.updateTrainingPlan(payload.planId, {
@@ -418,6 +443,11 @@ async function runMediaFinalizeTask(task: NonNullable<TaskRow>) {
     exerciseType?: string;
     sessionMode?: "practice" | "pk";
     durationMinutes?: number;
+    actionCount?: number;
+    actionSummary?: Record<string, number>;
+    dominantAction?: string;
+    validityStatus?: string;
+    invalidReason?: string;
   };
   const session = await getRemoteMediaSession(payload.sessionId);
 
@@ -495,6 +525,11 @@ async function runMediaFinalizeTask(task: NonNullable<TaskRow>) {
     title: payload.title || session.title,
     sessionMode: payload.sessionMode || "practice",
     durationMinutes: payload.durationMinutes ?? 5,
+    actionCount: payload.actionCount ?? 0,
+    actionSummary: payload.actionSummary ?? {},
+    dominantAction: payload.dominantAction ?? null,
+    validityStatus: payload.validityStatus ?? "pending",
+    invalidReason: payload.invalidReason ?? null,
   });
 
   return {
diff --git a/server/trainingAutomation.ts b/server/trainingAutomation.ts
index 5551bd7..6adad2f 100644
--- a/server/trainingAutomation.ts
+++ b/server/trainingAutomation.ts
@@ -199,21 +199,28 @@ export async function syncRecordingTrainingData(input: {
   title: string;
   sessionMode?: "practice" | "pk";
   durationMinutes?: number | null;
+  actionCount?: number | null;
+  actionSummary?: Record<string, number> | null;
+  dominantAction?: string | null;
+  validityStatus?: string | null;
+  invalidReason?: string | null;
 }) {
   const trainingDate = db.getDateKey();
-  const planMatch = await db.matchActivePlanForExercise(input.userId, input.exerciseType);
-  const exerciseLabel = ACTION_LABELS[input.exerciseType || "unknown"] || input.exerciseType || input.title;
+  const resolvedExerciseType = input.exerciseType || input.dominantAction || "recording";
+  const planMatch = await db.matchActivePlanForExercise(input.userId, resolvedExerciseType);
+  const exerciseLabel = ACTION_LABELS[resolvedExerciseType || "unknown"] || resolvedExerciseType || input.title;
+  const totalActions = Math.max(0, input.actionCount ?? 0);
   const recordResult = await db.upsertTrainingRecordBySource({
     userId: input.userId,
     planId: planMatch?.planId ?? null,
     linkedPlanId: planMatch?.planId ?? null,
     matchConfidence: planMatch?.confidence ?? null,
     exerciseName: exerciseLabel,
-    exerciseType: input.exerciseType || "unknown",
+    exerciseType: resolvedExerciseType,
     sourceType: "recording",
     sourceId: `recording:${input.videoId}`,
     videoId: input.videoId,
-    actionCount: 0,
+    actionCount: totalActions,
     durationMinutes: Math.max(1, input.durationMinutes ?? 5),
     completed: 1,
     poseScore: null,
@@ -222,8 +229,15 @@ export async function syncRecordingTrainingData(input: {
       source: "recording",
       sessionMode: input.sessionMode || "practice",
       title: input.title,
+      actionCount: totalActions,
+      actionSummary: input.actionSummary ?? {},
+      dominantAction: input.dominantAction ?? null,
+      validityStatus: input.validityStatus ?? "pending",
+      invalidReason: input.invalidReason ?? null,
     },
-    notes: "自动写入：录制归档",
+    notes: input.validityStatus?.startsWith("invalid")
+      ? `自动写入：录制归档（无效录制）${input.invalidReason ? ` · ${input.invalidReason}` : ""}`
+      : "自动写入：录制归档",
   });
 
   if (recordResult.isNew) {
@@ -234,7 +248,12 @@ export async function syncRecordingTrainingData(input: {
       deltaSessions: 1,
       deltaRecordingCount: 1,
       deltaPkCount: input.sessionMode === "pk" ? 1 : 0,
-      metadata: { latestRecordingExerciseType: input.exerciseType || "unknown" },
+      deltaTotalActions: totalActions,
+      deltaEffectiveActions: input.validityStatus?.startsWith("invalid") ? 0 : totalActions,
+      metadata: {
+        latestRecordingExerciseType: resolvedExerciseType,
+        latestRecordingValidity: input.validityStatus ?? "pending",
+      },
     });
   }