fix(voice): recover empty failed lessons

docs/incidents/2026-07-22-miniprogram-voice-retry.md

@@ -103,6 +103,7 @@ API 当前只有通用 HTTP 请求日志。重试请求未到达服务端时，
 - 重试开始后立即锁定操作并显示处理中状态；请求结束后无论成功或失败都刷新活动会话并恢复轮询。
 - 生成请求结束后始终刷新活动会话；API 错误消息和 `X-Request-Id` 保存在页面错误区域，可复制查询。
 - 页面增加失败原因说明和“放弃失败录音”；放弃操作不会自动开始录音，后端删除失败片段时会重算课堂状态，空课堂会一并删除。
+- 失败课节在列表内直接提供恢复操作：保留失败音频时显示“重试转录 / 删除录音”；未保留任何音频的空失败课节显示“重新录制 / 删除记录”，避免提供无法执行的转录重试。
 - 语音记录区分“已加入输入框”“待生成反馈”和“已生成反馈”，避免把待汇总的长录音笼统显示为“已就绪”。
 - 语音记录进一步调整为可复用素材列表：每节可查看完整转写、展开或收起、按需加入或重新加入输入框；短录音转写完成后不再自动修改正文。
 - 反馈输入框支持确认后清空，语音记录仍保留；单节内容加入后若超过 2000 字会整体拒绝并提示，不再截断后写入。
@@ -119,6 +120,7 @@ API 当前只有通用 HTTP 请求日志。重试请求未到达服务端时，
 - 点击“重试转录”后，API 日志中能查询到对应 `/retry` 请求和业务事件。
 - 页面在重试期间显示明确的处理中状态，且不会重复提交生成请求。
 - 重试成功后，该节录音自动进入可选总结集合；再次失败时显示可理解的失败原因。
+- 未保留音频的失败课节显示“重新录制”和“删除记录”，不会显示无法生效的转录重试。
 - 所有已就绪录音默认被选中，可逐节取消或一键全选；总结完成后必须先显示预览，不能自动覆盖输入框。
 - 两万字级原始转录不写入输入框；配置 AI 后由分层总结压缩为不超过 2000 字的一份正文。
 - 所有 API 错误都能在页面上获得可复制的请求编号。

pages/feedback/index.ts

@@ -4,6 +4,7 @@ import {
   createFeedbackRecord,
   createFeedbackSummaryRun,
   createVoiceLesson,
+  discardEmptyVoiceLesson,
   discardVoiceSegment,
   ensureFeedbackSession,
   finishVoiceLesson,
@@ -27,9 +28,11 @@ import type {
   VoiceLessonFinished
 } from '../../utils/types'
 import { runWithSessionRefresh } from './voice-actions'
+import type { VoiceLessonRecoveryAction } from './voice-state'
 import {
   getFailedVoiceSegments,
   getVoiceFailureHint,
+  getVoiceLessonRecoveryAction,
   getVoiceLessonStatusText,
   getVoicePrimaryAction,
   getVoicePrimaryActionText
@@ -60,6 +63,9 @@ interface VoiceLessonView {
   summaryEligible: boolean
   summarySelected: boolean
   failedSegmentCount: number
+  failureRecoveryAction: VoiceLessonRecoveryAction
+  failureRecoveryText: string
+  failureDeleteText: string
   addActionText: string
   emptyText: string
 }
@@ -127,7 +133,7 @@ function formatRecordingTime(milliseconds: number): string {
 
 function formatVoiceDuration(milliseconds: number): string {
   const totalMinutes = Math.floor(milliseconds / 60000)
-  if (totalMinutes < 1) return `${Math.max(1, Math.round(milliseconds / 1000))}秒`
+  if (totalMinutes < 1) return `${Math.max(0, Math.round(milliseconds / 1000))}秒`
   return `${totalMinutes}分钟`
 }
 
@@ -147,6 +153,7 @@ function buildVoiceLessonViews(
     const isInDraft = Boolean(transcript) && content.includes(transcript)
     const summaryEligible = lesson.status === 'ready' && Boolean(transcript)
     const failedSegmentCount = lesson.segments.filter((segment) => segment.status === 'failed').length
+    const failureRecoveryAction = getVoiceLessonRecoveryAction(lesson)
     let emptyText = '转录完成后可查看内容'
     if (lesson.status === 'failed') {
       emptyText = lesson.segments.find((segment) => segment.status === 'failed')?.errorMessage
@@ -166,6 +173,9 @@ function buildVoiceLessonViews(
       summaryEligible,
       summarySelected: summaryEligible && !excluded.has(lesson.id),
       failedSegmentCount,
+      failureRecoveryAction,
+      failureRecoveryText: failureRecoveryAction === 'retry' ? '重试转录' : '重新录制',
+      failureDeleteText: failureRecoveryAction === 'retry' ? '删除录音' : '删除记录',
       addActionText: isInDraft
         ? '已在输入框'
         : lesson.appliedDirectly
@@ -387,8 +397,12 @@ Page({
     }
 
     const prefix = `语音记录 · ${session.lessonCount}节 · ${formatVoiceDuration(session.totalDurationMs)}`
+    const emptyFailedLessonCount = session.lessons.filter((lesson) =>
+      lesson.status === 'failed' && lesson.segments.length === 0
+    ).length
     let suffix = '已就绪'
     if (session.failedSegmentCount > 0) suffix = `${session.failedSegmentCount}段转录失败`
+    else if (emptyFailedLessonCount > 0) suffix = `${emptyFailedLessonCount}节未保留录音`
     else if (session.processingSegmentCount > 0) suffix = '正在处理'
     else if (session.needsGeneration) suffix = '可生成总结'
     const primaryAction = getVoicePrimaryAction(session)
@@ -683,8 +697,13 @@ Page({
       return
     }
 
+    await this.startVoiceRecording()
+  },
+
+  async startVoiceRecording(permissionGranted = false) {
     this.setData({ voiceBusy: true, voiceStatus: '正在开启麦克风' })
-    const authorized = await this.ensureRecordPermission()
+    let authorized = permissionGranted
+    if (!authorized) authorized = await this.ensureRecordPermission()
     if (!authorized) {
       this.setData({ voiceBusy: false })
       this.syncVoicePresentation(this.data.session)
@@ -1063,13 +1082,57 @@ Page({
     await this.retryVoiceSegments(failedSegments)
   },
 
-  async retryVoiceLesson(event: LessonActionEvent) {
+  async recoverVoiceLesson(event: LessonActionEvent) {
     const session = this.data.session
     const lesson = session?.lessons.find((item) => item.id === event.currentTarget.dataset.lessonId)
     if (!lesson) return
     const failedSegments = lesson.segments.filter((segment) => segment.status === 'failed')
-    if (failedSegments.length === 0) return
+    if (failedSegments.length > 0) {
-    await this.retryVoiceSegments(failedSegments, lesson.sequence)
+      await this.retryVoiceSegments(failedSegments, lesson.sequence)
+      return
+    }
+    if (lesson.status === 'failed') await this.rerecordVoiceLesson(lesson)
+  },
+
+  confirmRerecordVoiceLesson(lessonSequence: number): Promise<boolean> {
+    return new Promise((resolve) => {
+      wx.showModal({
+        title: `重新录制第${lessonSequence}节`,
+        content: '该节没有保留可重试的音频。重新录制将删除这条失败记录并开启麦克风。',
+        confirmText: '重新录制',
+        success: (result) => resolve(result.confirm),
+        fail: () => resolve(false)
+      })
+    })
+  },
+
+  async rerecordVoiceLesson(lesson: VoiceLesson) {
+    if (
+      this.data.recording
+      || this.data.voiceBusy
+      || !(await this.confirmRerecordVoiceLesson(lesson.sequence))
+    ) return
+    this.setData({ voiceBusy: true, voiceStatus: `正在准备重新录制第${lesson.sequence}节` })
+    const authorized = await this.ensureRecordPermission()
+    if (!authorized) {
+      this.setData({ voiceBusy: false })
+      this.syncVoicePresentation(this.data.session)
+      return
+    }
+    try {
+      await discardEmptyVoiceLesson(lesson.id)
+      logVoiceOperation('empty_failed_lesson_rerecord_started', {
+        feedbackSessionId: this.data.session?.id || null,
+        lessonId: lesson.id,
+        lessonSequence: lesson.sequence
+      })
+      await this.startVoiceRecording(true)
+    } catch (error) {
+      this.setData({ voiceBusy: false })
+      await this.loadActiveSession()
+      this.syncVoicePresentation(this.data.session)
+      this.showApiError(error)
+    }
   },
 
   async retryVoiceSegments(
@@ -1141,6 +1204,19 @@ Page({
     })
   },
 
+  confirmDiscardEmptyVoiceLesson(lessonSequence: number): Promise<boolean> {
+    return new Promise((resolve) => {
+      wx.showModal({
+        title: `删除第${lessonSequence}节记录`,
+        content: '该节没有保留可用录音，删除后不会影响其他语音记录。此操作无法撤销。',
+        confirmText: '确认删除',
+        confirmColor: '#d13f3a',
+        success: (result) => resolve(result.confirm),
+        fail: () => resolve(false)
+      })
+    })
+  },
+
   async discardFailedSegments() {
     if (this.data.recording || this.data.voiceBusy) return
     const session = this.data.session
@@ -1159,13 +1235,50 @@ Page({
     const lesson = session?.lessons.find((item) => item.id === event.currentTarget.dataset.lessonId)
     if (!session || !lesson) return
     const failedSegments = lesson.segments.filter((segment) => segment.status === 'failed')
+    if (failedSegments.length === 0) {
+      if (
+        lesson.status === 'failed'
+        && await this.confirmDiscardEmptyVoiceLesson(lesson.sequence)
+      ) await this.discardEmptyFailedVoiceLesson(lesson)
+      return
+    }
     if (
-      failedSegments.length === 0
+      !(await this.confirmDiscardVoiceSegments(failedSegments.length, lesson.sequence))
-      || !(await this.confirmDiscardVoiceSegments(failedSegments.length, lesson.sequence))
     ) return
     await this.discardVoiceSegments(failedSegments, lesson.sequence)
   },
 
+  async discardEmptyFailedVoiceLesson(lesson: VoiceLesson) {
+    const session = this.data.session
+    if (!session) return
+    this.setData({
+      voiceBusy: true,
+      voiceStatus: `正在删除第${lesson.sequence}节失败记录`,
+      primaryActionText: '正在处理',
+      errorMessage: '',
+      errorRequestId: ''
+    })
+    try {
+      await runWithSessionRefresh(
+        async () => discardEmptyVoiceLesson(lesson.id),
+        async () => {
+          await this.loadActiveSession()
+        }
+      )
+      logVoiceOperation('empty_failed_lesson_discarded', {
+        feedbackSessionId: session.id,
+        lessonId: lesson.id,
+        lessonSequence: lesson.sequence
+      })
+      wx.showToast({ title: `第${lesson.sequence}节失败记录已删除`, icon: 'none' })
+    } catch (error) {
+      this.showApiError(error)
+    } finally {
+      this.setData({ voiceBusy: false })
+      this.syncVoicePresentation(this.data.session)
+    }
+  },
+
   async discardVoiceSegments(
     failedSegments: VoiceAudioSegment[],
     lessonSequence?: number

pages/feedback/index.wxml

@@ -101,7 +101,7 @@
                     <text class="voice-record-duration">{{lesson.durationText}} · {{lesson.transcriptLength}}字</text>
                   </view>
                 </view>
-                <text class="voice-record-status {{lesson.failedSegmentCount > 0 ? 'voice-record-status-failed' : ''}}">{{lesson.statusText}}</text>
+                <text class="voice-record-status {{lesson.failureRecoveryAction ? 'voice-record-status-failed' : ''}}">{{lesson.statusText}}</text>
               </view>
               <text
                 wx:if="{{lesson.transcript}}"
@@ -123,19 +123,19 @@
                   bindtap="addVoiceLessonToDraft"
                 >{{lesson.addActionText}}</button>
               </view>
-              <view wx:if="{{lesson.failedSegmentCount > 0}}" class="voice-record-failure-actions">
+              <view wx:if="{{lesson.failureRecoveryAction}}" class="voice-record-failure-actions">
                 <button
                   class="voice-record-retry-button"
                   data-lesson-id="{{lesson.id}}"
                   disabled="{{recording || voiceBusy}}"
-                  catchtap="retryVoiceLesson"
+                  catchtap="recoverVoiceLesson"
-                >重试转录</button>
+                >{{lesson.failureRecoveryText}}</button>
                 <button
                   class="voice-record-delete-button"
                   data-lesson-id="{{lesson.id}}"
                   disabled="{{recording || voiceBusy}}"
                   catchtap="discardVoiceLesson"
-                >删除录音</button>
+                >{{lesson.failureDeleteText}}</button>
               </view>
             </view>
           </checkbox-group>

pages/feedback/voice-state.ts

@@ -1,6 +1,7 @@
 import type { FeedbackSession, VoiceAudioSegment, VoiceLesson } from '../../utils/types'
 
 export type VoicePrimaryAction = 'save' | 'retry' | 'processing'
+export type VoiceLessonRecoveryAction = 'retry' | 'rerecord' | null
 
 export function getVoicePrimaryAction(session: FeedbackSession | null): VoicePrimaryAction {
   if (!session || session.lessonCount === 0) return 'save'
@@ -24,6 +25,15 @@ export function getFailedVoiceSegments(session: FeedbackSession): VoiceAudioSegm
   )
 }
 
+export function getVoiceLessonRecoveryAction(
+  lesson: VoiceLesson
+): VoiceLessonRecoveryAction {
+  if (lesson.status !== 'failed') return null
+  return lesson.segments.some((segment) => segment.status === 'failed')
+    ? 'retry'
+    : 'rerecord'
+}
+
 export function getVoiceLessonStatusText(lesson: VoiceLesson, isInDraft = false): string {
   if (lesson.status === 'failed') return '转录失败'
   if (lesson.status === 'recording') return '录音中'

server/src/recording_routes.rs

@@ -38,6 +38,7 @@ pub fn router() -> OpenApiRouter<SharedState> {
         .routes(routes!(finish_lesson_session))
         .routes(routes!(mark_lesson_applied))
         .routes(routes!(retry_audio_segment))
+        .routes(routes!(discard_empty_failed_lesson))
         .routes(routes!(discard_audio_segment))
         .routes(routes!(create_feedback_summary_run))
         .routes(routes!(get_feedback_summary_run))
@@ -796,6 +797,67 @@ async fn retry_audio_segment(
     }))
 }
 
+#[utoipa::path(
+    delete,
+    path = "/api/v1/feedback-lessons/{lesson_id}",
+    tag = "语音反馈",
+    summary = "删除未保留音频的失败课堂",
+    description = "删除没有任何录音片段、因而无法重试转录的失败课堂记录。",
+    params(
+        ("Authorization" = String, Header, description = "Bearer 会话令牌", example = "Bearer <access-token>"),
+        ("lesson_id" = Uuid, Path, description = "失败课堂录音 ID")
+    ),
+    responses(
+        (status = 204, description = "空失败课堂已删除"),
+        (status = 404, description = "课堂不存在、不属于当前用户或仍包含录音片段", body = ErrorBody),
+        CommonApiErrors
+    )
+)]
+async fn discard_empty_failed_lesson(
+    State(state): State<SharedState>,
+    headers: HeaderMap,
+    Path(lesson_id): Path<Uuid>,
+) -> Result<StatusCode, ApiError> {
+    let owner_id = state
+        .auth
+        .authenticate(state.pool.as_ref(), &headers)
+        .await?
+        .user_id;
+    let mut transaction = pool(&state)?.begin().await?;
+    let session_id = sqlx::query_scalar::<_, Uuid>(
+        "SELECT f.id FROM lesson_sessions l \
+         JOIN feedback_sessions f ON f.id = l.feedback_session_id \
+         WHERE l.id = $1 AND f.owner_id = $2 AND f.status = 'active' \
+           AND l.status = 'failed' \
+           AND NOT EXISTS (SELECT 1 FROM audio_segments s WHERE s.lesson_session_id = l.id) \
+         FOR UPDATE OF l",
+    )
+    .bind(lesson_id)
+    .bind(owner_id)
+    .fetch_optional(&mut *transaction)
+    .await?
+    .ok_or(ApiError::NotFound)?;
+
+    sqlx::query("DELETE FROM lesson_sessions WHERE id = $1")
+        .bind(lesson_id)
+        .execute(&mut *transaction)
+        .await?;
+    sqlx::query("UPDATE feedback_sessions SET updated_at = now() WHERE id = $1")
+        .bind(session_id)
+        .execute(&mut *transaction)
+        .await?;
+    transaction.commit().await?;
+
+    tracing::info!(
+        event = "empty_failed_lesson_discarded",
+        feedback_session_id = %session_id,
+        lesson_id = %lesson_id,
+        status = "discarded",
+        "empty failed lesson discarded"
+    );
+    Ok(StatusCode::NO_CONTENT)
+}
+
 #[utoipa::path(
     delete,
     path = "/api/v1/audio-segments/{segment_id}",

server/src/routes.rs

@@ -924,7 +924,8 @@ mod tests {
             .filter(|operation| operation.get("responses").is_some())
             .collect::<Vec<_>>();
 
-        assert_eq!(operations.len(), 27);
+        assert_eq!(operations.len(), 28);
+        assert!(paths.contains_key("/api/v1/feedback-lessons/{lesson_id}"));
         assert!(paths.contains_key("/api/v1/feedback-sessions/{session_id}/summary-runs"));
         assert!(paths.contains_key("/api/v1/feedback-summary-runs/{run_id}"));
         assert!(paths.contains_key("/api/v1/feedback-summary-runs/{run_id}/apply"));

tests/voice-state.test.js

@@ -3,6 +3,7 @@ const test = require('node:test')
 
 const {
   getVoiceFailureHint,
+  getVoiceLessonRecoveryAction,
   getVoiceLessonStatusText,
   getVoicePrimaryAction,
   getVoicePrimaryActionText
@@ -83,6 +84,23 @@ test('ready lessons explain whether their transcript can be added again', () =>
   assert.equal(getVoiceLessonStatusText({ ...lesson, includedInGeneration: true }), '已生成反馈')
 })
 
+test('failed lessons distinguish retryable audio from empty failed records', () => {
+  const failedLesson = {
+    status: 'failed',
+    segments: []
+  }
+
+  assert.equal(getVoiceLessonRecoveryAction(failedLesson), 'rerecord')
+  assert.equal(getVoiceLessonRecoveryAction({
+    ...failedLesson,
+    segments: [{ status: 'failed' }]
+  }), 'retry')
+  assert.equal(getVoiceLessonRecoveryAction({
+    ...failedLesson,
+    status: 'ready'
+  }), null)
+})
+
 test('session refresh runs after a failed API action', async () => {
   const expected = new Error('generation rejected')
   let refreshCount = 0

utils/api.ts

@@ -641,6 +641,13 @@ export async function discardVoiceSegment(segmentId: string): Promise<void> {
   )
 }
 
+export async function discardEmptyVoiceLesson(lessonId: string): Promise<void> {
+  await request<unknown>(
+    `/api/v1/feedback-lessons/${encodeURIComponent(lessonId)}`,
+    'DELETE'
+  )
+}
+
 export async function generateFeedbackFromVoice(
   sessionId: string,
   existingContent: string