diff --git a/AGENTS.md b/AGENTS.md
index 07ea087..094f28f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -282,5 +282,6 @@ MVP 内所有单元任务通过后才能做 MVP 集成验收；MVP 通过后才
 - #4 独立阅读选择小样位于 `spikes/selection/`，`python spikes/selection/serve.py` 默认仅本机 5184。桌面鼠标/键盘与 11 项测试已验证，#4 已获用户验收并关闭；真实手机长按/手柄/滚动详细证据仍未提供；禁止把窄屏桌面当作真机验收。Intl.Segmenter 只用于 UI 范围验证，不替代 #3 NLP；释义保存只在内存。固定 LinguaCafe 源码对照和与 v1 的差异记录见架构 Wiki。
 - 2026-09-11 用户确认正式 NLP/词典采用全 Go。#5 已验收并合入 main；#6 使用 Go WordNet 解析和词形候选、Go Unicode 原文分片、schema v4 共享词典资源表，不调用 Python NLP。WordNet 3.0 ZIP 来源与摘要见 `server/wordnet-resource.json`，许可保留在 `server/WORDNET-LICENSE.txt`。词形候选不等于上下文消歧，不自动合并个人学习状态；#3 Python 小样只保留历史验证。当前词典仅英语释义，个人释义输入为临时草稿，持久化归 #7。
 - 2026-09-11 用户确认 #7 个人词条口径（三项由 Agent 定案）：身份为「学习者＋语言＋规范化词形」，大小写合并但**不按 lemma/候选合并**（`dog` 与 `dogs` 是两条记录）；首次保存默认「新词」；状态为 新词/学习中/已知/忽略，只有「学习中」带 1～7 级，对应原版 stage 2/1/0/-1～-7；例句只保存手输内容，不自动关联原文句子。schema v5 新增 `lexgo_terms`（唯一键加状态/等级检查约束），个人释义与共享词典分离且不进入审计日志；等级编辑 UI 归 #8/#12。
+- 2026-09-11 用户确认 #10 编辑与删除口径：可改名、改章节标题、编辑章节正文；**只有正文变化才重新处理**，重复保存或改回原内容不新建任务，只改标题不改状态。版本键是 `content_sha256`：任务只在与章节版本一致时才能影响章节，过期版本任务标为 `error_reason=superseded` 且**完全不触碰章节**（认领、恢复扫描、重试都按版本裁决）；存储文本重算 SHA 与存储 SHA 不一致时按 `content_changed` 失败。删除为事务内硬删除 + 外键级联，删章后重排序号；个人词条、复习排期与作答记录**不随删除清理**。回收站/撤销、批量操作、章节跨书移动与语言变更不在范围内。编辑器行尾归一为 LF 是已知边界。
 - 2026-09-11 用户确认 #9 TXT 导入口径：只接受 UTF-8（允许可选 BOM，解码时剥离且不进入原文），非法字节整体拒绝、不使用替换字符；UTF-16 按 BOM 识别后明确拒绝，GB18030 等按非法 UTF-8 拒绝。文件字节上限 2 MiB，之后仍套用单章 100000 码点上限；换行与空白不归一化。文件只在内存中解码、不创建临时文件，客户端文件名不参与任何路径也不入库。解码后交给既有 `PasteBook`/`PasteChapter`，分章（一次提交一章）、`requestId` 幂等与任务恢复与粘贴一致；不改 schema。EPUB/PDF/字幕、UTF-16 转码、按空行自动分章与断点续传不在范围内。
 - 2026-09-11 用户确认 #8 到期单词复习决策表：固定间隔表 1/2/4/7/15/30/60 天，答对升级封顶 7、答错降级最低 1、再学一次不改等级，答错与再学立即回队；已知/忽略不入队，新保存的词立即到期，显式「学习中 level N」排 now+间隔[N]；只有新建或状态/等级实际变化才移动复习时间，编辑释义或例句保留原排期，保存未提及等级时保留已获得等级。到期判定用 UTC 绝对时刻（`due_at ≤ now`），不引入本地日边界。作答按 `answerId` 去重并以 `expectedDueAt` 判定过期标签页，重复提交、网络重发与双标签页都不得重复更新次数与间隔（作答响应 `result` 只取 applied/stale，重放另用 `duplicate` 标记并返回首次结果）；`correct_count` 只计答对，`wrong_count` 计答错与再学。短语复习归 #11，进度统计归 #13，不做策略配置 UI（X11）、练习模式（X08）与 FSRS。
diff --git a/docs/02-architecture-and-code-map.md b/docs/02-architecture-and-code-map.md
index 024af27..155099d 100644
--- a/docs/02-architecture-and-code-map.md
+++ b/docs/02-architecture-and-code-map.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Architecture-and-Code-Map
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Architecture-and-Code-Map.-
-wiki_revision: 5e22c6023b065287ac47d92e6b8748e34d21763b
-synchronized_at: 2026-09-13T14:36:36Z
+wiki_revision: ce95236e4c8de27c1063448571cfc528c895f937
+synchronized_at: 2026-09-13T15:20:16Z
 <!-- gitea-wiki-mirror:end -->
 
 # 架构与代码地图
@@ -287,3 +287,21 @@ schema v6 新增 `lexgo_term_reviews`（每个个人词条一行排期：`due_at
 解码规则见业务规则页；实现上 `decodeTextUpload` 先按 UTF-16 BOM 识别并给出针对性提示，再剥离可选 UTF-8 BOM，然后用 `utf8.Valid` 整体校验，最后交给 `validatePaste`（非空、≤100000 码点）。因此上传与粘贴共享同一分章与任务规则：一次提交一章，`requestId` + 内容 SHA 幂等，worker 只发布已落库的原文。
 
 学习端 `ImportView.vue` 增加「粘贴文本 / TXT 文件」来源切换（沿用已验收 v1 的切换与状态行），`stores/library.ts` 增加 `upload()` 与 `fileProblem`/`fileSizeLabel`，`session.request` 支持 `FormData`（multipart 请求不再被 JSON 化，边界由浏览器提供）。客户端预检只提前反馈，服务端结论为最终结论。
+
+## #10 编辑与删除书籍章节（2026-09-11）
+
+`server/app/lexgo/edit.go` 提供改名、编辑与删除；`ingest.go` 增加版本门控。**schema 无变化**：`chapters.content_sha256` 与 `jobs.content_sha256` 就是版本键，新增的 `superseded` 复用现有 `error_reason` 列。
+
+| 接口 | 权限与输入/输出 |
+|---|---|
+| PATCH /api/v1/books/:id | 本人；`{title}`；返回 `{book}` |
+| GET /api/v1/chapters/:id/source | 本人任意状态；返回 `{source:{id,bookId,ordinal,title,text,status,contentSha256,charCount}}`，供编辑使用；不接受查询参数 |
+| PATCH /api/v1/chapters/:id | 本人；`{title?,text?}`；返回 `{chapter,job,versionChanged}`；正文变化才新建任务 |
+| DELETE /api/v1/books/:id | 本人；返回 `{deleted:{bookId,chapters}}`；FC 级联删除章节与任务 |
+| DELETE /api/v1/chapters/:id | 本人；返回 `{deleted:{chapterId,bookId,remaining}}`；删除后重排序号 |
+
+**版本门控**（本单修掉的缺陷）：任务只在 `job.content_sha256 == chapter.content_sha256` 时才能影响章节。认领任务时用 JOIN 只取版本匹配的行，并先把过期版本任务一次性标为 `failed/superseded`；发布前再比对一次，不匹配就只把任务标为 `superseded` 并**完全不触碰章节**；恢复扫描同样先作废过期版本任务、只重排版本匹配的中断任务；重试接口拒绝版本不匹配的任务（409）。删除期间在途任务找不到章节时视为无事可做（级联已删除其任务行）。
+
+`unprocessableReason` 保留一条内容一致性检查：存储的正文重新计算出的 SHA 必须等于该章节存储的 SHA，用于兜住绕过 API 的直接写入（`content_changed`），与版本门控互不重复。
+
+学习端 `BookView.vue` 增加书名编辑对话框、章节编辑对话框（标题 + 正文，正文来自 source 接口）与两处确认弹窗（`ElMessageBox`），章节行增加「编辑」入口；`LibraryView.vue` 在书库被删后显示「书籍已删除 · 已保存的生词和短语仍保留在生词本。」；`stores/library.ts` 增加 `renameBook`、`updateChapter`、`loadChapterSource`、`deleteBook`、`deleteChapter`。正文编辑通过浏览器 textarea 输入，因此该章的行尾统一为 LF（粘贴与 TXT 导入仍保留原始 CRLF）。
diff --git a/docs/03-business-rules-and-glossary.md b/docs/03-business-rules-and-glossary.md
index 50e085e..3be078f 100644
--- a/docs/03-business-rules-and-glossary.md
+++ b/docs/03-business-rules-and-glossary.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Business-Rules-and-Glossary
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Business-Rules-and-Glossary.-
-wiki_revision: 76289713c11902383031764c90ae9da90bd0ce07
-synchronized_at: 2026-09-11T15:36:44Z
+wiki_revision: 96eec89f74db744d8807baa24b1d1d611ff6bf8f
+synchronized_at: 2026-09-13T15:20:16Z
 <!-- gitea-wiki-mirror:end -->
 
 # 业务规则与术语
@@ -206,3 +206,23 @@ exact优先；未命中再按WordNet异常表/词尾规则查候选，词性顺
 **导入与幂等**：上传与粘贴共用同一套规则——一次提交一章，`requestId` + 内容 SHA 保证重复上传同一文件只产生一章（返回第一次的章节并标记 `duplicate`），同一 `requestId` 换成其他内容返回 409。任务状态、失败重试与崩溃恢复沿用 #5 的任务机制，不新增状态。标题规则与粘贴完全相同（去空白后非空、≤120 字符）；省略 `language` 时默认英语，与粘贴一致；追加章节不接受 `language`。
 
 **范围边界**：不包含 EPUB、PDF、字幕与其他文件格式；不做按空行自动分章；不做 UTF-16/GB18030 转码；不做断点续传；不把来源文件名持久化（若将来需要「导入来源」溯源，另立范围）。
+
+## #10 编辑、版本与删除规则（2026-09-11）
+
+**可编辑内容**：书名、章节标题、章节正文。只有正文变化才重新处理；只改标题不改变处理状态，也不新建任务。
+
+**版本规则**：`chapters.content_sha256` 是章节的版本键，`jobs.content_sha256` 是任务被创建时对应的版本。任务只能在版本匹配时影响章节：
+- 过期版本的任务被标为 `error_reason=superseded`（「章节内容已更新为新版本，本次处理已作废」），**不会**把章节标成失败、也不会发布旧文本；界面上失败章节的重试按钮只出现于当前版本的任务。
+- 任务重试要求版本匹配，否则 409，避免把当前章节拉回旧版本再失败一次。
+- 重复保存同一正文不是新版本：不新建任务、不改变状态。改回原内容（内容相同）同样不触发处理。
+- 编辑章节正文会保留章节编号与阅读入口（URL 不变），章节状态回到待处理，处理完成后原文即新版本。
+
+**存储文本与版本一致性**：章节存储的正文重新计算出的 SHA 必须等于存储的 SHA；出现不一致（绕过 API 的直接写入）时按 `content_changed` 失败，不发布不确定内容。
+
+**删除规则**：删除在事务内**硬删除**，并沿用现有外键级联清理：书籍 → 章节 → 任务。删除章节后剩余章节序号重排为连续（原型显示「剩余 N 章」，导航按序号取值）；并发删除同一章由书籍行锁序列化，结果是一个成功、一个 404。重复删除返回 404，不把「已经不存在」当成成功。恢复路径是数据库备份与完整恢复（#15 演练范围），产品不提供回收站或撤销。
+
+**个人学习记录保留**：删除书籍或章节**不删除**个人词条、复习排期与作答记录，因为它们按学习者归属、不引用章节；界面也没有「来自某章节」的引用（例句是学习者输入的副本）。所以删除只影响书籍、章节与处理任务，这一点在原型确认文案中就写明：「本章正文将被删除，已保存词条保留」「删除这本书及其章节？已保存的生词和短语将保留」。
+
+**归属与边界**：改名、编辑、删除、读取编辑用原文都严格按会话归属；他人资源与不存在资源统一 404，未登录 401，空标题/空正文/超长文本/未知字段 400。学习端正文编辑框的行尾会统一为 LF（浏览器 textarea 行为），粘贴与 TXT 导入路径仍然保留原始 CRLF 与空白。
+
+**范围边界**：不做封面与音频附件（#21）、不做回收站/撤销、不做批量操作、不做章节跨书移动、不做语言变更。
diff --git a/docs/04-local-development-and-verification.md b/docs/04-local-development-and-verification.md
index e586692..62ce6a9 100644
--- a/docs/04-local-development-and-verification.md
+++ b/docs/04-local-development-and-verification.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Local-Development-and-Verification
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Local-Development-and-Verification.-
-wiki_revision: 8c0886a74112ea7bff734c04775b56c571797c3d
-synchronized_at: 2026-09-11T15:36:44Z
+wiki_revision: 251fb5de71b8ba75da3cba6eee41454d5bbd22df
+synchronized_at: 2026-09-13T15:20:16Z
 <!-- gitea-wiki-mirror:end -->
 
 # 本地开发与验证
@@ -398,3 +398,21 @@ node --test spikes/english/view.test.mjs
 真实链路验证：真实 Go API＋真实 MySQL 共 26 项检查通过（凭据只从本机安全配置读入进程），覆盖有效文件与阅读器原文逐字节一致、BOM 不进入原文、五类无效文件、越权与未登录拒绝、两账号隔离、恶意文件名不泄漏；随后用临时 Playwright 用例在真实学习端完成「登录→切换 TXT→选择真实 UTF-8 文件→上传→处理中就绪→阅读器原文逐字符一致」的闭环，并复核 UTF-16 文件在浏览器预检阶段被拒。截图保存在本机 `.local/evidence/`（issue9-invalid-encoding.png、issue9-upload-processing.png、issue9-reader.png），临时用例运行后删除。
 
 未验证：真实手机触屏详细证据与完整备份恢复演练仍属既有缺口（#14/#15）；本单只用桌面浏览器检查。大文件并发上传只按单槽并发门设计，没有做多用户压力测试。UTF-16/GB18030 转码与按空行自动分章不在本单。
+
+## #10 验证与迁移（2026-09-11）
+
+仓库根执行；Go 工具链由 `python scripts/server.py` 固定 go1.26.5。本单使用专用测试库 lexgo_test_issue9（沿用上一单的库），不借用其他测试库。本单**不改动数据库结构**，没有迁移步骤，回退只需换回旧二进制。
+
+| 命令 | 结果 |
+|---|---|
+| `go vet ./...` | 通过 |
+| `LEXGO_TEST_DB_NAME=lexgo_test_issue9 python scripts/server.py test-integration` | 59 个顶层用例全部通过、0 跳过；含 #10 新增 9 个用例 |
+| `cd learner`：`npx vitest --run` / `npx vue-tsc --build` / `npx pnpm run build` / `npx playwright test` | 94 项单测、类型检查、构建、7 项 E2E 全部通过 |
+| `cd admin`：`npx pnpm test` / `npx pnpm lint` | 31 项与 lint 通过；管理端本单无代码改动 |
+| `python -m unittest discover -s tests` / `python dev_scripts/harness.py check --strict` | 56 项与严格检查通过 |
+
+覆盖内容：改名不改状态也不新建任务、标题/正文校验、正文变化产生新版本且保留章节编号、**处理中改正文后旧任务只标 `superseded` 且不触碰新版本**、旧版本任务重试 409、重复保存与改回原内容不新建任务、内容与版本不一致时按 `content_changed` 失败、恢复扫描作废过期版本且不重排新版本、编辑用原文对任意状态可读、删除章节后序号连续且导航正确、删除书籍级联清理章节与任务、删除期间在途任务不复活内容、并发删除同一章一个成功一个 404、重复删除 404、跨用户改名/编辑/删除/读原文一律 404、未登录 401、个人词条与复习排期在删除后完全保留。
+
+真实链路验证：真实 Go API＋真实 MySQL 共 36 项检查通过（凭据只从本机安全配置读入进程，脚本可重复运行并自行清理 fixture），覆盖改名、编辑产生新版本并重新处理、重复保存幂等、删除章节重排序号、删除书籍级联、个人词条与复习队列在删除后保留、越权与非法输入拒绝；随后用临时 Playwright 用例在真实学习端完成「导入→改名→编辑正文→新版就绪→删除章节→删除书籍→书库提示」的闭环，并核对阅读器原文等于新版本。截图保存在本机 `.local/evidence/`（issue10-book-after-edit.png、issue10-chapter-deleted.png、issue10-book-deleted.png），临时用例运行后删除。
+
+未验证：真实手机触屏详细证据与完整备份恢复演练仍属既有缺口（#14/#15）；本单只用桌面浏览器检查。并发只覆盖「同一章节并发删除」与「处理中编辑」两类，没有做多用户压力测试。浏览器 textarea 会把该章的 CRLF 归一为 LF，属已知边界，已记入业务规则页。
diff --git a/docs/09-product-requirements-overview.md b/docs/09-product-requirements-overview.md
index 5dbdacb..b5ba810 100644
--- a/docs/09-product-requirements-overview.md
+++ b/docs/09-product-requirements-overview.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Product-Requirements-Overview
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Product-Requirements-Overview.-
-wiki_revision: 9bb9f570044fb7c9e04c5f1bd04beeaf89840d86
-synchronized_at: 2026-09-13T14:36:37Z
+wiki_revision: 82d714b949d38f20586fbe42797b2dec6b0f19f1
+synchronized_at: 2026-09-13T15:20:17Z
 <!-- gitea-wiki-mirror:end -->
 
 # 产品需求总览
@@ -257,3 +257,9 @@ F10 的单词到期复习已于 2026-09-11 通过用户验收（包含独立审
 F03 的 TXT 文件导入已于 2026-09-13 通过用户验收：学习端导入页新增「粘贴文本 / TXT 文件」来源切换，选择 UTF-8 的 .txt 文件后经大小、空文件与编码校验进入与粘贴相同的处理与阅读流程，失败可重试。只支持 UTF-8（允许可选 BOM）且不替换损坏字符；UTF-16 与其他编码会被明确拒绝；文件只在内存中解码、不写临时文件，客户端文件名不参与任何路径也不入库；重复上传同一文件只产生一章。schema 无变化。
 
 仍未实现并留给后续工单：书籍与章节的编辑删除（#10）、短语选择与保存（#11）、词汇库搜索与编辑（#12）、阅读完成与进度（#13）、桌面与手机体验补齐（#14）、自托管试用交付与完整恢复（#15）。EPUB/PDF/字幕、UTF-16 转码、按空行自动分章与断点续传不在本单范围。
+
+## #10 交付范围更新（2026-09-11）
+
+F01 的编辑与删除已实现，待用户验收：学习端可改书名、改章节标题、编辑章节正文并按新版本重新处理，可用确认弹窗删除章节或整本书。编辑正文产生明确版本，旧处理结果被标为 `superseded` 而不覆盖新版本；删除在事务内完成并重排剩余章节序号，个人词条、复习排期与作答记录一律保留。本次没有数据库结构变化。
+
+仍未实现并留给后续工单：短语选择与保存（#11）、词汇库搜索与编辑（#12）、阅读完成与进度（#13）、桌面与手机体验补齐（#14）、自托管试用交付与完整恢复（#15）。封面与音频附件（#21）、回收站/撤销、批量操作、章节跨书移动与语言变更不在本单范围。
diff --git a/docs/README.md b/docs/README.md
index 7838094..4ccfb56 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: Home
 wiki_url: https://git.ilapage.cn/OPC/lexgo/wiki/Home
-wiki_revision: 03e9280eedbd7506ec567cef61a54745873d71e2
-synchronized_at: 2026-09-13T14:36:36Z
+wiki_revision: ea264da6747bd141ec2d67011830320452563415
+synchronized_at: 2026-09-13T15:20:16Z
 <!-- gitea-wiki-mirror:end -->
 
 # LexGo 文档入口
@@ -76,3 +76,5 @@ Quant-UX 原型 v1 已通过用户验收。[桌面预览](https://qux.ilapage.cn
 #8 单词到期复习已于 2026-09-11 通过用户验收（schema v6 新增 lexgo_term_reviews 与 lexgo_review_answers）：固定间隔表（1/2/4/7/15/30/60 天）、答对升级、答错或再学立即回队、已知与忽略不入队；重复提交、网络重发与双标签页都只记账一次，到期判定用 UTC 绝对时刻而不引入本地日边界。学习端新增「到期复习」入口，卡片正面显示词与挖空例句、答案面显示个人释义，并有完成页与空队列页。独立审核指出的并发同键 500、编辑文本重排复习与面板保存重置等级三项已整改并复测；PR #27 已 fast-forward-only 合入 main。第 3 阶段「首条学习闭环」#5～#8 全部验收。
 
 #9 TXT 文件导入已于 2026-09-13 通过用户验收：导入页新增「粘贴文本 / TXT 文件」来源切换，只接受 UTF-8（允许可选 BOM）且不替换损坏字符，UTF-16 与其他编码会被明确拒绝；文件只在内存中解码、不写临时文件，客户端文件名不参与任何路径也不入库；上传与粘贴共用同一分章、任务与幂等规则，重复上传同一文件只产生一章。本次没有数据库结构变化；PR #28 已 fast-forward-only 合入 main。
+
+#10 编辑与删除书籍章节已实现，待用户验收：可改书名、改章节标题、编辑章节正文并按新版本重新处理，也可用确认弹窗删除章节或整本书。编辑正文产生明确版本，旧处理结果会被标为 superseded 而不覆盖新版本；删除在事务内完成并重排剩余章节序号，已保存的个人词条、复习排期与作答记录一律保留。本次没有数据库结构变化。
diff --git a/learner/e2e/edit.spec.ts b/learner/e2e/edit.spec.ts
new file mode 100644
index 0000000..3b66f64
--- /dev/null
+++ b/learner/e2e/edit.spec.ts
@@ -0,0 +1,106 @@
+import { expect, test, type Page } from '@playwright/test'
+
+// Renaming, editing and deleting through the real dialogs of the accepted prototype, against
+// a mocked API.
+test('rename the book, edit a chapter into a new version and delete both', async ({ page }) => {
+  const user = { id: 42, username: 'fictional-editor', role: 'learner' }
+  const timestamps = { createdAt: '2026-01-01T00:00:00Z', updatedAt: '2026-01-01T00:00:00Z' }
+  const first = { id: 9, bookId: 1, ordinal: 1, title: 'First chapter', status: 'ready', charCount: 24, errorReason: '', errorMessage: '', jobId: 5, ...timestamps }
+  const second = { id: 10, bookId: 1, ordinal: 2, title: 'Second chapter', status: 'ready', charCount: 12, errorReason: '', errorMessage: '', jobId: 6, ...timestamps }
+  let bookTitle = 'A small step'
+  let chapters = [first, second]
+  let firstText = 'Mira opened the workshop.\n'
+  let processing = false
+  const requests: string[] = []
+
+  const listBook = () => ({
+    book: { id: 1, title: bookTitle, language: 'en' },
+    chapters: chapters.map(item => (item.id === 9 && processing ? { ...item, status: 'processing' } : item)),
+  })
+
+  await page.route('**/api/v1/**', async route => {
+    const path = new URL(route.request().url()).pathname
+    const method = route.request().method()
+    requests.push(`${method} ${path}`)
+    let data: unknown = null
+    let status = 200
+    if (path === '/api/v1/login') data = { token: 'fictional-session', user }
+    else if (path === '/api/v1/me') data = user
+    else if (path === '/api/v1/space') data = { ownerId: user.id, language: 'en' }
+    else if (path === '/api/v1/books' && method === 'GET') {
+      data = { items: bookTitle === '' ? [] : [{ id: 1, title: bookTitle, language: 'en', chapterCount: chapters.length, pendingCount: 0, processingCount: 0, readyCount: chapters.length, failedCount: 0, ...timestamps }] }
+    } else if (path === '/api/v1/books/1' && method === 'PATCH') {
+      bookTitle = (route.request().postDataJSON() as { title: string }).title
+      data = { book: { id: 1, title: bookTitle, language: 'en' } }
+    } else if (path === '/api/v1/books/1' && method === 'DELETE') {
+      chapters = []
+      bookTitle = ''
+      data = { deleted: { bookId: 1, chapters: 2, remaining: 0 } }
+    } else if (path === '/api/v1/books/1') data = listBook()
+    else if (path === '/api/v1/chapters/9/source') data = { source: { id: 9, bookId: 1, ordinal: 1, title: first.title, text: firstText, status: 'ready', contentSha256: 'sha-a', charCount: [...firstText].length } }
+    else if (path === '/api/v1/chapters/9' && method === 'PATCH') {
+      const body = route.request().postDataJSON() as { title?: string; text?: string }
+      const changed = body.text !== undefined && body.text !== firstText
+      if (body.title !== undefined) first.title = body.title
+      if (changed) {
+        firstText = body.text as string
+        processing = true
+        first.status = 'pending'
+        setTimeout(() => { processing = false; first.status = 'ready' }, 400)
+      }
+      status = 200
+      data = { chapter: first, job: changed ? { id: 7, bookId: 1, chapterId: 9, status: 'pending', attempts: 0, errorReason: '', errorMessage: '', ...timestamps } : null, versionChanged: changed }
+    } else if (path === '/api/v1/chapters/9' && method === 'DELETE') {
+      chapters = chapters.filter(item => item.id !== 9).map((item, index) => ({ ...item, ordinal: index + 1 }))
+      data = { deleted: { chapterId: 9, bookId: 1, remaining: chapters.length } }
+    }
+    await route.fulfill({ status, json: { code: 200, data } })
+  })
+
+  await page.goto('/')
+  await page.getByLabel('账号').fill(user.username)
+  await page.getByLabel('密码', { exact: true }).fill('fictional-password')
+  await page.getByRole('button', { name: '登录', exact: true }).click()
+  await page.getByRole('link', { name: 'A small step' }).click()
+  await expect(page.getByRole('heading', { name: 'A small step' })).toBeVisible()
+  await expect(page.getByText('封面使用系统默认样式')).toBeVisible()
+
+  // Rename the book through the dialog.
+  await page.getByTestId('edit-book').click()
+  await expect(page.getByLabel('书名', { exact: true })).toHaveValue('A small step')
+  await page.getByLabel('书名', { exact: true }).fill('A long step')
+  await page.getByTestId('save-book').click()
+  await expect(page.getByTestId('book-notice')).toContainText('书名已更新')
+  await expect(page.getByRole('heading', { name: 'A long step' })).toBeVisible()
+
+  // Edit the chapter text: the new version re-processes and later becomes ready again.
+  await page.getByTestId('edit-chapter-9').click()
+  await expect(page.getByLabel('章节标题', { exact: true })).toHaveValue('First chapter')
+  await expect(page.getByLabel('正文', { exact: true })).toHaveValue(firstText)
+  await page.getByLabel('正文', { exact: true }).fill('A replacement body.\n')
+  await page.getByTestId('save-chapter').click()
+  await expect(page.getByTestId('book-notice')).toContainText('已保存为新版本，正在重新处理')
+  // The saved version is queued first and becomes readable again when the worker finishes.
+  await expect(page.locator('.chapter-row').first()).toContainText('待处理')
+  await expect(page.locator('.chapter-row').first()).toContainText('已就绪', { timeout: 10000 })
+
+  // Deleting a chapter asks first, then reports the remaining count.
+  await page.getByTestId('edit-chapter-9').click()
+  await page.getByTestId('delete-chapter').click()
+  await expect(page.locator('.el-message-box__message').last()).toContainText('本章正文将被删除，已保存词条保留')
+  await page.locator('.el-message-box').last().getByRole('button', { name: '取消' }).click()
+  expect(requests.filter(entry => entry === 'DELETE /api/v1/chapters/9')).toHaveLength(0)
+  await page.getByTestId('delete-chapter').click()
+  await page.locator('.el-message-box').last().getByRole('button', { name: '确认删除章节' }).click()
+  await expect(page.getByTestId('book-notice')).toContainText('章节已删除 · 剩余 1 章')
+  await expect(page.locator('.chapter-row')).toHaveCount(1)
+
+  // Deleting the book asks first and returns to the library without it.
+  await page.getByTestId('delete-book').click()
+  await expect(page.locator('.el-message-box__message').last()).toContainText('已保存的生词和短语将保留')
+  await page.locator('.el-message-box').last().getByRole('button', { name: '确认删除' }).click()
+  await expect(page).toHaveURL(/\?deleted=\d+$/)
+  await expect(page.getByRole('heading', { name: '我的书库' })).toBeVisible()
+  await expect(page.getByTestId('library-notice')).toContainText('书籍已删除 · 已保存的生词和短语仍保留在生词本')
+  await expect(page.getByRole('link', { name: 'A long step' })).toHaveCount(0)
+})
diff --git a/learner/src/__tests__/edit.spec.ts b/learner/src/__tests__/edit.spec.ts
new file mode 100644
index 0000000..d9b10ff
--- /dev/null
+++ b/learner/src/__tests__/edit.spec.ts
@@ -0,0 +1,237 @@
+import { afterEach, beforeEach, describe, expect, it, vi, type MockInstance } from 'vitest'
+import { flushPromises, mount, type VueWrapper } from '@vue/test-utils'
+import { createPinia, setActivePinia } from 'pinia'
+import { createRouter, createMemoryHistory, type Router } from 'vue-router'
+import { ElMessageBox } from 'element-plus'
+import BookView from '../views/BookView.vue'
+import { useLibraryStore, type ChapterSource, type ChapterSummary } from '../stores/library'
+import { useSessionStore } from '../stores/session'
+
+const user = { id: 42, username: 'fictional-editor', role: 'learner' as const }
+const book = { id: 1, title: 'A small step', language: 'en' }
+const timestamps = { createdAt: '2026-01-01T00:00:00Z', updatedAt: '2026-01-01T00:00:00Z' }
+const chapter = (overrides: Partial<ChapterSummary> = {}): ChapterSummary => ({
+  id: 9, bookId: 1, ordinal: 1, title: 'First chapter', status: 'ready', charCount: 12,
+  errorReason: '', errorMessage: '', jobId: 5, ...timestamps, ...overrides,
+})
+const source: ChapterSource = { id: 9, bookId: 1, ordinal: 1, title: 'First chapter', text: 'Mira opened the workshop.\n', status: 'ready', contentSha256: 'sha-a', charCount: 24 }
+const ok = (data: unknown) => new Response(JSON.stringify({ code: 200, data }))
+const fail = (msg: string, status = 400) => new Response(JSON.stringify({ code: status, msg }), { status })
+let wrapper: VueWrapper | undefined
+
+function stub(name: string) {
+  return { template: `<div>${name}</div>` }
+}
+
+async function viewAt(path: string): Promise<Router> {
+  const router = createRouter({
+    history: createMemoryHistory(),
+    routes: [
+      { path: '/', component: stub('LibraryStub') },
+      { path: '/books/:id', component: stub('BookStub') },
+      { path: '/import', component: stub('ImportStub') },
+    ],
+  })
+  await router.push(path)
+  await router.isReady()
+  return router
+}
+
+/** Routes the book page's own calls; a test can override any of them. */
+function mockApi(overrides: Record<string, (init?: RequestInit) => Response | Promise<Response>> = {}): MockInstance {
+  return vi.spyOn(globalThis, 'fetch').mockImplementation(async (input, init) => {
+    const url = String(input)
+    const method = String((init as RequestInit | undefined)?.method ?? 'GET')
+    for (const [key, handler] of Object.entries(overrides)) {
+      if (url.includes(key)) return handler(init as RequestInit)
+    }
+    if (url.endsWith('/books/1') && method === 'GET') return ok({ book, chapters: [chapter()] })
+    if (url.includes('/chapters/9/source')) return ok({ source })
+    // A rename answers with the stored book, and a delete reports what it removed.
+    if (url.endsWith('/books/1') && method === 'PATCH') {
+      const body = JSON.parse(String((init as RequestInit | undefined)?.body ?? '{}')) as { title?: string }
+      return ok({ book: { ...book, title: body.title ?? book.title } })
+    }
+    if (url.endsWith('/books/1') && method === 'DELETE') return ok({ deleted: { bookId: 1, chapters: 3 } })
+    if (url.endsWith('/books/1')) return ok({ book })
+    if (url.includes('/chapters/9')) return ok({ chapter: chapter(), job: null, versionChanged: false })
+    return ok({})
+  })
+}
+
+async function openBook() {
+  useSessionStore().user = { ...user }
+  const router = await viewAt('/books/1')
+  wrapper = mount(BookView, { attachTo: document.body, global: { plugins: [router] } })
+  await flushPromises()
+  return { view: wrapper, router }
+}
+
+describe('book editing store', () => {
+  beforeEach(() => { setActivePinia(createPinia()); sessionStorage.clear() })
+  afterEach(() => { vi.restoreAllMocks() })
+
+  it('renames a book and keeps the list entry in step', async () => {
+    const fetchMock = mockApi()
+    const library = useLibraryStore()
+    library.books = [{ ...book, chapterCount: 1, pendingCount: 0, processingCount: 0, readyCount: 1, failedCount: 0, ...timestamps }]
+    library.book = { ...book }
+    const renamed = await library.renameBook(1, '  New name  ')
+    expect(renamed.title).toBe('New name')
+    expect(library.book?.title).toBe('New name')
+    expect(library.books[0]?.title).toBe('New name')
+    const call = fetchMock.mock.calls.find(([, init]) => (init as RequestInit | undefined)?.method === 'PATCH')!
+    expect(String(call[0])).toBe('/api/v1/books/1')
+    expect(JSON.parse(String((call[1] as RequestInit).body))).toEqual({ title: 'New name' })
+  })
+
+  it('refuses an invalid title before calling the API', async () => {
+    const fetchMock = mockApi()
+    const library = useLibraryStore()
+    await expect(library.renameBook(1, '   ')).rejects.toThrow('请填写标题')
+    expect(fetchMock).not.toHaveBeenCalled()
+  })
+
+  it('applies a new chapter version and drops the stale reader text', async () => {
+    mockApi({ '/chapters/9': () => ok({ chapter: chapter({ status: 'pending', title: 'Edited' }), job: { id: 6, bookId: 1, chapterId: 9, status: 'pending', attempts: 0, errorReason: '', errorMessage: '', ...timestamps }, versionChanged: true }) })
+    const library = useLibraryStore()
+    library.chapters = [chapter()]
+    library.chapter = { ...chapter(), contentSha256: 'sha-a', originalText: 'old text' }
+    const result = await library.updateChapter(9, { title: 'Edited', text: 'new text' })
+    expect(result.versionChanged).toBe(true)
+    expect(library.chapters[0]).toMatchObject({ status: 'pending', title: 'Edited', jobId: 6 })
+    // The reader must not keep showing text that is no longer the stored version.
+    expect(library.chapter?.originalText).toBeUndefined()
+  })
+
+  it('keeps the reader text when only the title changed', async () => {
+    mockApi({ '/chapters/9': () => ok({ chapter: chapter({ title: 'Renamed' }), job: null, versionChanged: false }) })
+    const library = useLibraryStore()
+    library.chapters = [chapter()]
+    library.chapter = { ...chapter(), contentSha256: 'sha-a', originalText: 'kept text' }
+    await library.updateChapter(9, { title: 'Renamed' })
+    expect(library.chapter?.originalText).toBe('kept text')
+    expect(library.chapter?.title).toBe('Renamed')
+  })
+
+  it('deletes a chapter, reloads the book and removes a deleted book from the list', async () => {
+    mockApi({
+      '/chapters/9': () => ok({ deleted: { chapterId: 9, bookId: 1, remaining: 2 } }),
+      '/books/1': (init) => (init?.method === 'DELETE'
+        ? ok({ deleted: { bookId: 1, chapters: 3 } })
+        : ok({ book, chapters: [] })),
+    })
+    const library = useLibraryStore()
+    library.books = [{ ...book, chapterCount: 3, pendingCount: 0, processingCount: 0, readyCount: 3, failedCount: 0, ...timestamps }]
+    library.book = { ...book }
+    library.chapters = [chapter(), chapter({ id: 10, ordinal: 2 }), chapter({ id: 11, ordinal: 3 })]
+    const deleted = await library.deleteChapter(9)
+    expect(deleted.remaining).toBe(2)
+    expect(library.chapters.map(item => item.id)).toEqual([])
+    expect(library.book?.id).toBe(1)
+    const removed = await library.deleteBook(1)
+    expect(removed.chapters).toBe(3)
+    expect(library.books).toHaveLength(0)
+    expect(library.book).toBeNull()
+  })
+
+  it('reads the editable source of any chapter state', async () => {
+    mockApi({ '/chapters/9/source': () => ok({ source: { ...source, status: 'failed' } }) })
+    const library = useLibraryStore()
+    const loaded = await library.loadChapterSource(9)
+    expect(loaded.text).toBe(source.text)
+    expect(loaded.status).toBe('failed')
+  })
+})
+
+describe('book editing view', () => {
+  beforeEach(() => { setActivePinia(createPinia()); sessionStorage.clear(); vi.restoreAllMocks() })
+  afterEach(() => { wrapper?.unmount(); wrapper = undefined; useLibraryStore().stopPolling() })
+
+  it('renames the book through the dialog and reports it', async () => {
+    const fetchMock = mockApi()
+    const { view } = await openBook()
+    await view.get('[data-testid="edit-book"]').trigger('click'); await flushPromises()
+    const input = view.get('#book-title')
+    expect((input.element as HTMLInputElement).value).toBe('A small step')
+    await input.setValue('  Edited name  ')
+    await view.get('[data-testid="save-book"]').trigger('click'); await flushPromises()
+    const patch = fetchMock.mock.calls.find(([, init]) => (init as RequestInit | undefined)?.method === 'PATCH')!
+    expect(JSON.parse(String((patch[1] as RequestInit).body))).toEqual({ title: 'Edited name' })
+    expect(view.get('[data-testid="book-notice"]').text()).toContain('书名已更新')
+  })
+
+  it('keeps the dialog open with the server message when renaming fails', async () => {
+    mockApi({ '/books/1': (init) => (init?.method === 'PATCH' ? fail('书名已存在') : ok({ book, chapters: [chapter()] })) })
+    const { view } = await openBook()
+    await view.get('[data-testid="edit-book"]').trigger('click'); await flushPromises()
+    await view.get('#book-title').setValue('Rejected')
+    await view.get('[data-testid="save-book"]').trigger('click'); await flushPromises()
+    expect(view.text()).toContain('书名已存在')
+    expect(view.get('#book-title')).toBeTruthy()
+  })
+
+  it('asks before deleting the book and does nothing when the learner cancels', async () => {
+    const fetchMock = mockApi()
+    const confirm = vi.spyOn(ElMessageBox, 'confirm').mockRejectedValue('cancel')
+    const { view } = await openBook()
+    await view.get('[data-testid="delete-book"]').trigger('click'); await flushPromises()
+    expect(confirm).toHaveBeenCalledWith(expect.stringContaining('已保存的生词和短语将保留'), '删除书籍', expect.anything())
+    expect(fetchMock.mock.calls.some(([, init]) => (init as RequestInit | undefined)?.method === 'DELETE')).toBe(false)
+  })
+
+  it('deletes the book after confirmation and returns to the library', async () => {
+    const fetchMock = mockApi()
+    vi.spyOn(ElMessageBox, 'confirm').mockResolvedValue('confirm' as never)
+    const { view, router } = await openBook()
+    await view.get('[data-testid="delete-book"]').trigger('click'); await flushPromises()
+    expect(fetchMock.mock.calls.some(([url, init]) => String(url).endsWith('/books/1') && (init as RequestInit | undefined)?.method === 'DELETE')).toBe(true)
+    expect(router.currentRoute.value.path).toBe('/')
+    expect(router.currentRoute.value.query.deleted).toBe('3')
+  })
+
+  it('edits a chapter: loads the source, saves title and text and reports the new version', async () => {
+    const fetchMock = mockApi({ '/chapters/9': (init) => (init?.method === 'PATCH'
+      ? ok({ chapter: chapter({ status: 'pending', title: 'Edited chapter' }), job: { id: 6, bookId: 1, chapterId: 9, status: 'pending', attempts: 0, errorReason: '', errorMessage: '', ...timestamps }, versionChanged: true })
+      : ok({ source })) })
+    const { view } = await openBook()
+    await view.get('[data-testid="edit-chapter-9"]').trigger('click'); await flushPromises()
+    expect((view.get('#chapter-title').element as HTMLInputElement).value).toBe('First chapter')
+    expect((view.get('#chapter-text').element as HTMLTextAreaElement).value).toBe(source.text)
+    await view.get('#chapter-title').setValue('Edited chapter')
+    await view.get('#chapter-text').setValue('A new body.\n')
+    await view.get('[data-testid="save-chapter"]').trigger('click'); await flushPromises()
+    const patch = fetchMock.mock.calls.find(([url, init]) => String(url).endsWith('/chapters/9') && (init as RequestInit | undefined)?.method === 'PATCH')!
+    expect(JSON.parse(String((patch[1] as RequestInit).body))).toEqual({ title: 'Edited chapter', text: 'A new body.\n' })
+    expect(view.get('[data-testid="book-notice"]').text()).toContain('已保存为新版本，正在重新处理')
+  })
+
+  it('refuses an empty chapter body locally and keeps the dialog', async () => {
+    const fetchMock = mockApi()
+    const { view } = await openBook()
+    await view.get('[data-testid="edit-chapter-9"]').trigger('click'); await flushPromises()
+    await view.get('#chapter-text').setValue('   \n\t ')
+    await view.get('[data-testid="save-chapter"]').trigger('click'); await flushPromises()
+    expect(view.text()).toContain('请粘贴要导入的英文正文。')
+    expect(fetchMock.mock.calls.some(([, init]) => (init as RequestInit | undefined)?.method === 'PATCH')).toBe(false)
+  })
+
+  it('deletes a chapter after confirmation and reports the remaining count', async () => {
+    const fetchMock = mockApi({ '/chapters/9': (init) => (init?.method === 'DELETE' ? ok({ deleted: { chapterId: 9, bookId: 1, remaining: 2 } }) : ok({ source })) })
+    vi.spyOn(ElMessageBox, 'confirm').mockResolvedValue('confirm' as never)
+    const { view } = await openBook()
+    await view.get('[data-testid="edit-chapter-9"]').trigger('click'); await flushPromises()
+    await view.get('[data-testid="delete-chapter"]').trigger('click'); await flushPromises()
+    expect(fetchMock.mock.calls.some(([url, init]) => String(url).endsWith('/chapters/9') && (init as RequestInit | undefined)?.method === 'DELETE')).toBe(true)
+    expect(view.get('[data-testid="book-notice"]').text()).toContain('章节已删除 · 剩余 2 章')
+    // Element Plus keeps a closed dialog in the DOM, so the closed state is what matters.
+    expect(view.get('[data-testid="chapter-dialog"]').isVisible()).toBe(false)
+  })
+
+  it('shows an empty chapter list with the import hint', async () => {
+    mockApi({ '/books/1': () => ok({ book, chapters: [] }) })
+    const { view } = await openBook()
+    expect(view.get('[data-testid="empty-chapters"]').text()).toContain('这一本书还没有章节')
+    expect(view.get('[data-testid="delete-book"]')).toBeTruthy()
+  })
+})
diff --git a/learner/src/stores/library.ts b/learner/src/stores/library.ts
index ac27d76..de0c738 100644
--- a/learner/src/stores/library.ts
+++ b/learner/src/stores/library.ts
@@ -51,6 +51,21 @@ export interface Job {
 
 export interface ChapterNavigation { previousChapterId: number | null; nextChapterId: number | null }
 
+/** The editable text of one owned chapter; separate from the ready-only reader payload. */
+export interface ChapterSource {
+  id: number
+  bookId: number
+  ordinal: number
+  title: string
+  text: string
+  status: ChapterStatus
+  contentSha256: string
+  charCount: number
+}
+
+export interface ChapterEdit { chapter: ChapterSummary; job: Job | null; versionChanged: boolean }
+export interface DeletionResult { bookId?: number; chapterId?: number; chapters?: number; remaining: number }
+
 export type SubmitTarget = { mode: 'new' } | { mode: 'append'; bookId: number }
 
 export interface SubmitInput { title: string; text: string; target: SubmitTarget }
@@ -429,6 +444,80 @@ export const useLibraryStore = defineStore('library', () => {
     }
   }
 
+  /** Renames one owned book; the reply is the stored book. */
+  async function renameBook(id: number, title: string): Promise<BookRef> {
+    const version = generation
+    const owner = ownerId()
+    const problem = titleProblem(title)
+    if (problem) throw new Error(problem)
+    const result = await session.request<{ book: BookRef }>(`books/${id}`, 'PATCH', { title: title.trim() })
+    if (!isStale(version, owner)) {
+      book.value = result.book
+      const listed = books.value.find(item => item.id === id)
+      if (listed) listed.title = result.book.title
+    }
+    return result.book
+  }
+
+  /**
+   * Saves a chapter title and/or text. A changed text becomes a new version and re-processes;
+   * the same text answered again changes nothing.
+   */
+  async function updateChapter(id: number, input: { title?: string; text?: string }): Promise<ChapterEdit> {
+    const version = generation
+    const owner = ownerId()
+    if (input.title !== undefined) {
+      const problem = titleProblem(input.title)
+      if (problem) throw new Error(problem)
+    }
+    if (input.text !== undefined) {
+      const problem = textProblem(input.text)
+      if (problem) throw new Error(problem)
+    }
+    const body: { title?: string; text?: string } = {}
+    if (input.title !== undefined) body.title = input.title.trim()
+    if (input.text !== undefined) body.text = input.text
+    const result = await session.request<ChapterEdit>(`chapters/${id}`, 'PATCH', body)
+    if (isStale(version, owner)) return result
+    const merged = { ...result.chapter, jobId: result.job?.id ?? result.chapter.jobId }
+    applyChapterSummary(merged)
+    if (chapter.value !== null && chapter.value.id === id && result.versionChanged) {
+      // The new version is not readable yet, so the reader must drop the previous text.
+      chapter.value = { ...chapter.value, ...merged, originalText: undefined }
+    }
+    schedulePolling()
+    return result
+  }
+
+  /** Reads the editable text of one owned chapter, in any processing state. */
+  async function loadChapterSource(id: number): Promise<ChapterSource> {
+    const result = await session.request<{ source: ChapterSource }>(`chapters/${id}/source`)
+    return result.source
+  }
+
+  /** Deletes one owned book with its chapters and jobs; personal records stay. */
+  async function deleteBook(id: number): Promise<DeletionResult> {
+    const version = generation
+    const owner = ownerId()
+    const result = await session.request<{ deleted: DeletionResult }>(`books/${id}`, 'DELETE')
+    if (!isStale(version, owner)) {
+      books.value = books.value.filter(item => item.id !== id)
+      if (book.value?.id === id) closeBook()
+    }
+    return result.deleted
+  }
+
+  /** Deletes one owned chapter and closes the gap in the chapter order. */
+  async function deleteChapter(id: number): Promise<DeletionResult> {
+    const version = generation
+    const owner = ownerId()
+    const result = await session.request<{ deleted: DeletionResult }>(`chapters/${id}`, 'DELETE')
+    if (isStale(version, owner)) return result.deleted
+    chapters.value = chapters.value.filter(item => item.id !== id)
+    if (book.value !== null) await loadBook(book.value.id, { silent: true })
+    return result.deleted
+  }
+
   /** The job id comes from the chapter itself, wherever that chapter was loaded from. */
   function jobIdOf(chapterId: number): number | null {
     const target = chapters.value.find(item => item.id === chapterId)
@@ -526,6 +615,7 @@ export const useLibraryStore = defineStore('library', () => {
     chapter, chapterBook, navigation, chapterLoading, chapterError,
     submitting, submitError, retryingChapterId, readerText,
     loadBooks, loadBook, loadChapter, submit, upload, retryChapter,
+    renameBook, updateChapter, loadChapterSource, deleteBook, deleteChapter,
     stopPolling, closeBook, closeChapter, reset,
   }
 })
diff --git a/learner/src/style.css b/learner/src/style.css
index d7fe386..27eafc5 100644
--- a/learner/src/style.css
+++ b/learner/src/style.css
@@ -128,6 +128,8 @@ a.chapter-name:hover { color: #315c43; text-decoration: underline; }
 .lookup-saved { color: #2f6b45; font-size: 14px; margin: 12px 0 0; }
 .lookup-actions { display: flex; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
 .review-page { max-width: 680px; }
+.chapter-notice { margin: 12px 0 0; padding: 10px 14px; border: 1px solid #d9decf; border-radius: 8px; background: #fbf7ee; color: #6b5b3e; }
+.chapter-list .chapter-row { flex-wrap: wrap; }
 .review-notice { margin: 10px 0 0; padding: 10px 14px; border: 1px solid #d9decf; border-radius: 8px; background: #fbf7ee; color: #6b5b3e; }
 .review-card, .review-summary { margin-top: 26px; padding: 28px; border: 1px solid #d9decf; border-radius: 14px; background: #fffdf8; }
 .review-summary h2 { margin-top: 0; font-family: Georgia, serif; font-size: 24px; }
diff --git a/learner/src/views/BookView.vue b/learner/src/views/BookView.vue
index 6a7902f..d70f3e5 100644
--- a/learner/src/views/BookView.vue
+++ b/learner/src/views/BookView.vue
@@ -1,8 +1,8 @@
 <script setup lang="ts">
 import { computed, onMounted, onUnmounted, ref, watch } from 'vue'
 import { RouterLink, useRoute, useRouter } from 'vue-router'
-import { ElButton } from 'element-plus'
-import { canRetry, statusLabel, useLibraryStore } from '../stores/library'
+import { ElButton, ElDialog, ElInput, ElMessageBox } from 'element-plus'
+import { canRetry, statusLabel, TEXT_MAX_CODE_POINTS, textProblem, titleProblem, useLibraryStore, type ChapterSource } from '../stores/library'
 import { useSessionStore } from '../stores/session'
 
 const session = useSessionStore()
@@ -10,8 +10,23 @@ const library = useLibraryStore()
 const route = useRoute()
 const router = useRouter()
 const retryError = ref('')
+const notice = ref('')
+
+// Renaming the book.
+const bookDialog = ref(false)
+const bookTitle = ref('')
+const bookError = ref('')
+// Editing one chapter: title and text, loaded from the source endpoint.
+const chapterDialog = ref(false)
+const chapterSource = ref<ChapterSource | null>(null)
+const chapterTitle = ref('')
+const chapterText = ref('')
+const chapterError = ref('')
+const chapterLoading = ref(false)
+const saving = ref(false)
 
 const bookId = computed(() => Number(route.params.id))
+const chapterLength = computed(() => [...chapterText.value].length)
 
 async function load() {
   retryError.value = ''
@@ -24,6 +39,95 @@ async function retry(chapterId: number) {
   catch (reason) { retryError.value = reason instanceof Error ? reason.message : '重试失败，请稍后重试。' }
 }
 
+function openBookDialog() {
+  bookTitle.value = library.book?.title ?? ''
+  bookError.value = ''
+  bookDialog.value = true
+}
+
+async function saveBookTitle() {
+  if (saving.value || library.book === null) return
+  bookError.value = titleProblem(bookTitle.value)
+  if (bookError.value) return
+  saving.value = true
+  try {
+    await library.renameBook(library.book.id, bookTitle.value)
+    bookDialog.value = false
+    notice.value = '书名已更新。'
+  } catch (reason) {
+    bookError.value = reason instanceof Error ? reason.message : '保存失败，请稍后重试。'
+  } finally {
+    saving.value = false
+  }
+}
+
+async function openChapterDialog(chapterId: number) {
+  chapterDialog.value = true
+  chapterLoading.value = true
+  chapterError.value = ''
+  chapterSource.value = null
+  try {
+    const source = await library.loadChapterSource(chapterId)
+    chapterSource.value = source
+    chapterTitle.value = source.title
+    chapterText.value = source.text
+  } catch (reason) {
+    chapterError.value = reason instanceof Error ? reason.message : '章节内容暂时无法加载，请稍后重试。'
+  } finally {
+    chapterLoading.value = false
+  }
+}
+
+async function saveChapter() {
+  const source = chapterSource.value
+  if (saving.value || source === null) return
+  chapterError.value = titleProblem(chapterTitle.value) || textProblem(chapterText.value)
+  if (chapterError.value) return
+  saving.value = true
+  try {
+    const edited = await library.updateChapter(source.id, { title: chapterTitle.value, text: chapterText.value })
+    chapterDialog.value = false
+    notice.value = edited.versionChanged ? '章节已保存为新版本，正在重新处理。' : '章节已保存。'
+  } catch (reason) {
+    chapterError.value = reason instanceof Error ? reason.message : '保存失败，请稍后重试。'
+  } finally {
+    saving.value = false
+  }
+}
+
+async function confirmDeleteBook() {
+  if (library.book === null) return
+  const id = library.book.id
+  try {
+    await ElMessageBox.confirm('删除这本书及其章节？已保存的生词和短语将保留。', '删除书籍', {
+      confirmButtonText: '确认删除', cancelButtonText: '取消，保留书籍', type: 'warning',
+    })
+  } catch { return }
+  try {
+    const deleted = await library.deleteBook(id)
+    await router.replace(`/?deleted=${deleted.chapters ?? 0}`)
+  } catch (reason) {
+    retryError.value = reason instanceof Error ? reason.message : '删除失败，请稍后重试。'
+  }
+}
+
+async function confirmDeleteChapter(chapterId: number, ordinal: number) {
+  try {
+    await ElMessageBox.confirm(`删除第 ${ordinal} 章？本章正文将被删除，已保存词条保留。`, '删除章节', {
+      confirmButtonText: '确认删除章节', cancelButtonText: '取消', type: 'warning',
+    })
+  } catch { return }
+  try {
+    const deleted = await library.deleteChapter(chapterId)
+    // The chapter no longer exists, so the dialog closes and the list reports the remainder.
+    chapterDialog.value = false
+    chapterSource.value = null
+    notice.value = `章节已删除 · 剩余 ${deleted.remaining} 章`
+  } catch (reason) {
+    retryError.value = reason instanceof Error ? reason.message : '删除失败，请稍后重试。'
+  }
+}
+
 async function logout() {
   try { await session.logout() }
   catch { session.notice = '已退出此设备。服务器暂时无法连接，请稍后重试。' }
@@ -57,12 +161,15 @@ onUnmounted(() => library.closeBook())
         <div class="page-title">
           <div>
             <h1>{{ library.book.title }}</h1>
-            <p class="subtle">{{ library.chapters.length }} 个章节 · 语言 英语</p>
+            <p class="subtle">{{ library.chapters.length }} 个章节 · 语言 英语 · 封面使用系统默认样式</p>
           </div>
           <div class="page-actions">
+            <ElButton data-testid="edit-book" @click="openBookDialog">编辑书名</ElButton>
             <RouterLink :to="`/import?book=${library.book.id}`" class="link-button">追加章节</RouterLink>
+            <ElButton type="danger" plain data-testid="delete-book" @click="confirmDeleteBook">删除书籍</ElButton>
           </div>
         </div>
+        <p v-if="notice" role="status" class="chapter-notice" data-testid="book-notice">{{ notice }}</p>
         <p v-if="retryError" role="alert" class="notice">{{ retryError }}</p>
         <ul v-if="library.chapters.length" class="chapter-list" aria-label="章节列表">
           <li v-for="item in library.chapters" :key="item.id" class="chapter-row">
@@ -82,13 +189,50 @@ onUnmounted(() => library.closeBook())
               :loading="library.retryingChapterId === item.id"
               @click="retry(item.id)"
             >重试</ElButton>
+            <ElButton size="small" :data-testid="`edit-chapter-${item.id}`" @click="openChapterDialog(item.id)">编辑</ElButton>
           </li>
         </ul>
-        <section v-else class="empty-library" aria-label="章节列表">
+        <section v-else class="empty-library" aria-label="章节列表" data-testid="empty-chapters">
           <h2>这一本书还没有章节</h2>
           <p class="subtle">粘贴一段英文即可生成第一章。</p>
         </section>
       </template>
+
+      <ElDialog v-model="bookDialog" title="编辑书名" width="420" data-testid="book-dialog">
+        <label for="book-title">书名</label>
+        <ElInput id="book-title" v-model="bookTitle" type="text" maxlength="200" :disabled="saving" />
+        <p class="subtle">封面使用系统默认样式。</p>
+        <p v-if="bookError" role="alert" class="field-error">{{ bookError }}</p>
+        <template #footer>
+          <ElButton @click="bookDialog = false">取消</ElButton>
+          <ElButton type="primary" :loading="saving" data-testid="save-book" @click="saveBookTitle">保存修改</ElButton>
+        </template>
+      </ElDialog>
+
+      <ElDialog v-model="chapterDialog" title="编辑章节" width="620" data-testid="chapter-dialog">
+        <p v-if="chapterLoading" role="status" class="loading">正在加载…</p>
+        <template v-else-if="chapterSource">
+          <label for="chapter-title">章节标题</label>
+          <ElInput id="chapter-title" v-model="chapterTitle" type="text" maxlength="200" :disabled="saving" />
+          <label for="chapter-text">正文</label>
+          <ElInput id="chapter-text" v-model="chapterText" type="textarea" :rows="12" :disabled="saving" />
+          <p class="counter">{{ chapterLength }} / {{ TEXT_MAX_CODE_POINTS }} 字符</p>
+          <p class="subtle">保存后会重新处理这一章；只改标题不会重新处理。</p>
+        </template>
+        <p v-if="chapterError" role="alert" class="field-error">{{ chapterError }}</p>
+        <template #footer>
+          <ElButton data-testid="cancel-chapter" @click="chapterDialog = false">取消</ElButton>
+          <ElButton
+            v-if="chapterSource"
+            type="danger"
+            plain
+            :disabled="saving"
+            data-testid="delete-chapter"
+            @click="confirmDeleteChapter(chapterSource.id, chapterSource.ordinal)"
+          >删除章节</ElButton>
+          <ElButton type="primary" :loading="saving" :disabled="chapterLoading || !chapterSource" data-testid="save-chapter" @click="saveChapter">保存章节</ElButton>
+        </template>
+      </ElDialog>
     </main>
   </div>
 </template>
diff --git a/learner/src/views/LibraryView.vue b/learner/src/views/LibraryView.vue
index aab8e77..a0d90f7 100644
--- a/learner/src/views/LibraryView.vue
+++ b/learner/src/views/LibraryView.vue
@@ -1,6 +1,6 @@
 <script setup lang="ts">
-import { onMounted, ref } from 'vue'
-import { RouterLink, useRouter } from 'vue-router'
+import { computed, onMounted, ref } from 'vue'
+import { RouterLink, useRoute, useRouter } from 'vue-router'
 import { ElButton } from 'element-plus'
 import BookMark from '../components/BookMark.vue'
 import { statusSummary, useLibraryStore } from '../stores/library'
@@ -8,8 +8,15 @@ import { useSessionStore } from '../stores/session'
 const session = useSessionStore()
 const library = useLibraryStore()
 const router = useRouter()
+const route = useRoute()
 const loading = ref(true)
 const error = ref('')
+// A deletion returns here with the count it removed, so the learner sees what happened.
+const deletedNotice = computed(() => {
+  const raw = Array.isArray(route.query.deleted) ? route.query.deleted[0] : route.query.deleted
+  if (typeof raw !== 'string' || !/^\d+$/.test(raw)) return ''
+  return '书籍已删除 · 已保存的生词和短语仍保留在生词本。'
+})
 async function load() {
   loading.value = true
   error.value = ''
@@ -45,6 +52,7 @@ onMounted(load)
           <ElButton type="primary" @click="router.push('/import')">导入内容</ElButton>
         </div>
       </div>
+      <p v-if="deletedNotice" role="status" class="chapter-notice" data-testid="library-notice">{{ deletedNotice }}</p>
       <p v-if="loading" role="status" class="loading">正在加载…</p>
       <div v-else-if="error || library.booksError" class="notice">
         <p role="alert">{{ error || library.booksError }}</p>
diff --git a/server/app/lexgo/edit.go b/server/app/lexgo/edit.go
new file mode 100644
index 0000000..4f3eb90
--- /dev/null
+++ b/server/app/lexgo/edit.go
@@ -0,0 +1,286 @@
+package lexgo
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"github.com/gin-gonic/gin"
+	admin "go-admin/app/admin/models"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// Editing and deleting are strictly owner scoped. Nothing here touches personal terms,
+// review rows or answers: those belong to the learner, not to a book or a chapter.
+
+type BookUpdateInput struct {
+	Title string `json:"title"`
+}
+
+type ChapterUpdateInput struct {
+	Title *string `json:"title"`
+	Text  *string `json:"text"`
+}
+
+// ChapterSource is the editable text of one owned chapter. It is separate from the reader
+// contract, which only exposes text once a chapter is ready, so a failed chapter can be
+// corrected and submitted again.
+type ChapterSource struct {
+	ID            int64  `json:"id"`
+	BookID        int64  `json:"bookId"`
+	Ordinal       int    `json:"ordinal"`
+	Title         string `json:"title"`
+	Text          string `json:"text"`
+	Status        string `json:"status"`
+	ContentSHA256 string `json:"contentSha256"`
+	CharCount     int    `json:"charCount"`
+}
+
+type ChapterEdit struct {
+	Chapter        ChapterSummary `json:"chapter"`
+	Job            *JobView       `json:"job"`
+	VersionChanged bool           `json:"versionChanged"`
+}
+
+type DeletionResult struct {
+	BookID    int64 `json:"bookId,omitempty"`
+	ChapterID int64 `json:"chapterId,omitempty"`
+	Chapters  int   `json:"chapters,omitempty"`
+	Remaining int   `json:"remaining"`
+}
+
+// editTitle validates a title with the same rules a paste uses, so a renamed book or chapter
+// stays within the limits the list and reader already rely on.
+func editTitle(raw string) (string, error) {
+	title := strings.TrimSpace(raw)
+	if title == "" {
+		return "", failure(400, "请填写标题")
+	}
+	if utf8.RuneCountInString(title) > maxTitleRunes {
+		return "", failure(400, "标题最多 120 个字符")
+	}
+	return title, nil
+}
+
+// lockOwnedChapter returns the caller's chapter or reports it as missing, so another
+// account's chapter id is never confirmed to exist.
+func lockOwnedChapter(tx *gorm.DB, owner int, chapterID int64, chapter *Chapter) error {
+	err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).
+		Where("id = ? AND owner_id = ?", chapterID, owner).First(chapter).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return failure(404, "章节不存在")
+	}
+	return err
+}
+
+func RenameBook(tx *gorm.DB, owner int, bookID int64, input BookUpdateInput, now time.Time) (BookRef, error) {
+	title, err := editTitle(input.Title)
+	if err != nil {
+		return BookRef{}, err
+	}
+	var book Book
+	if err = lockOwnedBook(tx, owner, bookID, &book); err != nil {
+		return BookRef{}, err
+	}
+	book.Title = title
+	book.UpdatedAt = stamp(now)
+	if err = tx.Model(&Book{}).Where("id = ? AND owner_id = ?", book.ID, owner).
+		Updates(map[string]any{"title": title, "updated_at": book.UpdatedAt}).Error; err != nil {
+		return BookRef{}, err
+	}
+	return bookRef(book), nil
+}
+
+func ChapterEditSource(tx *gorm.DB, owner int, chapterID int64) (ChapterSource, error) {
+	var chapter Chapter
+	if err := tx.Where("id = ? AND owner_id = ?", chapterID, owner).First(&chapter).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ChapterSource{}, failure(404, "章节不存在")
+		}
+		return ChapterSource{}, err
+	}
+	return ChapterSource{
+		ID: chapter.ID, BookID: chapter.BookID, Ordinal: chapter.Ordinal, Title: chapter.Title,
+		Text: chapter.OriginalText, Status: chapter.Status, ContentSHA256: chapter.ContentSHA256,
+		CharCount: chapter.CharCount,
+	}, nil
+}
+
+// UpdateChapter renames a chapter and, when the text really changed, stores it as a new
+// version and queues a job for it. Only a changed version re-processes: a repeated save of
+// the same text is idempotent, and a title-only edit never touches the processing state.
+func UpdateChapter(tx *gorm.DB, owner int, chapterID int64, input ChapterUpdateInput, now time.Time) (ChapterEdit, error) {
+	if input.Title == nil && input.Text == nil {
+		return ChapterEdit{}, failure(400, "请选择要修改的内容")
+	}
+	var chapter Chapter
+	if err := lockOwnedChapter(tx, owner, chapterID, &chapter); err != nil {
+		return ChapterEdit{}, err
+	}
+	ts := stamp(now)
+	updates := map[string]any{"updated_at": ts}
+	if input.Title != nil {
+		title, err := editTitle(*input.Title)
+		if err != nil {
+			return ChapterEdit{}, err
+		}
+		chapter.Title = title
+		updates["title"] = title
+	}
+	var job *IngestJob
+	if input.Text != nil {
+		text := *input.Text
+		if _, sha, count, err := validatePaste(chapter.Title, text); err != nil {
+			return ChapterEdit{}, err
+		} else if sha != chapter.ContentSHA256 {
+			// A new version replaces the text and owns the chapter's state from here on.
+			chapter.OriginalText, chapter.ContentSHA256, chapter.CharCount = text, sha, count
+			chapter.Status, chapter.ErrorReason = statusPending, ""
+			updates["original_text"] = text
+			updates["content_sha256"] = sha
+			updates["char_count"] = count
+			updates["status"] = statusPending
+			updates["error_reason"] = ""
+			// The request key is derived from chapter and version, so one version has one job.
+			key := contentSHA(fmt.Sprintf("edit:%d:%s", chapter.ID, sha))
+			created := IngestJob{OwnerID: owner, BookID: chapter.BookID, ChapterID: chapter.ID,
+				RequestKey: key, ContentSHA256: sha, Status: statusPending, CreatedAt: ts, UpdatedAt: ts}
+			if err := tx.Create(&created).Error; err != nil {
+				return ChapterEdit{}, err
+			}
+			job = &created
+		}
+	}
+	if err := tx.Model(&Chapter{}).Where("id = ? AND owner_id = ?", chapter.ID, owner).Updates(updates).Error; err != nil {
+		return ChapterEdit{}, err
+	}
+	result := ChapterEdit{VersionChanged: job != nil}
+	if job != nil {
+		view := jobView(*job)
+		result.Job = &view
+	}
+	jobID := int64(0)
+	if job != nil {
+		jobID = job.ID
+	}
+	result.Chapter = chapterSummaryWithJob(chapter, &jobID)
+	return result, nil
+}
+
+// DeleteBook removes the caller's book with its chapters and their jobs in one transaction.
+// Personal terms, review schedules and answers are not touched: they belong to the learner.
+func DeleteBook(tx *gorm.DB, owner int, bookID int64) (DeletionResult, error) {
+	var book Book
+	if err := lockOwnedBook(tx, owner, bookID, &book); err != nil {
+		return DeletionResult{}, err
+	}
+	var chapters int64
+	if err := tx.Model(&Chapter{}).Where("book_id = ? AND owner_id = ?", book.ID, owner).Count(&chapters).Error; err != nil {
+		return DeletionResult{}, err
+	}
+	// Chapters and their jobs go with the book through the foreign keys.
+	if err := tx.Where("id = ? AND owner_id = ?", book.ID, owner).Delete(&Book{}).Error; err != nil {
+		return DeletionResult{}, err
+	}
+	return DeletionResult{BookID: book.ID, Chapters: int(chapters)}, nil
+}
+
+// DeleteChapter removes one owned chapter with its jobs and closes the gap in the chapter
+// order, so "剩余 N 章" and the reader navigation stay contiguous.
+func DeleteChapter(tx *gorm.DB, owner int, chapterID int64) (DeletionResult, error) {
+	var chapter Chapter
+	if err := lockOwnedChapter(tx, owner, chapterID, &chapter); err != nil {
+		return DeletionResult{}, err
+	}
+	// Lock the book too: two concurrent deletions in one book must not renumber each other.
+	var book Book
+	if err := lockOwnedBook(tx, owner, chapter.BookID, &book); err != nil {
+		return DeletionResult{}, err
+	}
+	if err := tx.Where("id = ? AND owner_id = ?", chapter.ID, owner).Delete(&Chapter{}).Error; err != nil {
+		return DeletionResult{}, err
+	}
+	// Ordering ascending decrements each row into a slot the previous row just freed, which
+	// keeps the unique (book_id, ordinal) key satisfied throughout.
+	if err := tx.Exec("UPDATE lexgo_chapters SET ordinal = ordinal - 1 WHERE book_id = ? AND owner_id = ? AND ordinal > ? ORDER BY ordinal ASC",
+		chapter.BookID, owner, chapter.Ordinal).Error; err != nil {
+		return DeletionResult{}, err
+	}
+	var remaining int64
+	if err := tx.Model(&Chapter{}).Where("book_id = ? AND owner_id = ?", chapter.BookID, owner).Count(&remaining).Error; err != nil {
+		return DeletionResult{}, err
+	}
+	return DeletionResult{ChapterID: chapter.ID, BookID: chapter.BookID, Remaining: int(remaining)}, nil
+}
+
+func registerEditRoutes(v *gin.RouterGroup, protect func(bool, func(*gin.Context, *gorm.DB, admin.SysUser) (any, error)) gin.HandlerFunc, now func() time.Time) {
+	v.PATCH("/books/:id", protect(false, func(c *gin.Context, tx *gorm.DB, u admin.SysUser) (any, error) {
+		id, err := pathID(c, "书籍不存在")
+		if err != nil {
+			return nil, err
+		}
+		var input BookUpdateInput
+		if err = decode(c, &input); err != nil {
+			return nil, err
+		}
+		book, err := RenameBook(tx, u.UserId, id, input, now())
+		if err != nil {
+			return nil, err
+		}
+		return gin.H{"book": book}, nil
+	}))
+	v.DELETE("/books/:id", protect(false, func(c *gin.Context, tx *gorm.DB, u admin.SysUser) (any, error) {
+		id, err := pathID(c, "书籍不存在")
+		if err != nil {
+			return nil, err
+		}
+		result, err := DeleteBook(tx, u.UserId, id)
+		if err != nil {
+			return nil, err
+		}
+		return gin.H{"deleted": result}, nil
+	}))
+	v.GET("/chapters/:id/source", protect(false, func(c *gin.Context, tx *gorm.DB, u admin.SysUser) (any, error) {
+		if c.Request.URL.RawQuery != "" {
+			return nil, failure(400, "正文接口不接受查询参数")
+		}
+		id, err := pathID(c, "章节不存在")
+		if err != nil {
+			return nil, err
+		}
+		source, err := ChapterEditSource(tx, u.UserId, id)
+		if err != nil {
+			return nil, err
+		}
+		return gin.H{"source": source}, nil
+	}))
+	v.PATCH("/chapters/:id", protect(false, func(c *gin.Context, tx *gorm.DB, u admin.SysUser) (any, error) {
+		id, err := pathID(c, "章节不存在")
+		if err != nil {
+			return nil, err
+		}
+		var input ChapterUpdateInput
+		if err = decode(c, &input); err != nil {
+			return nil, err
+		}
+		edited, err := UpdateChapter(tx, u.UserId, id, input, now())
+		if err != nil {
+			return nil, err
+		}
+		return edited, nil
+	}))
+	v.DELETE("/chapters/:id", protect(false, func(c *gin.Context, tx *gorm.DB, u admin.SysUser) (any, error) {
+		id, err := pathID(c, "章节不存在")
+		if err != nil {
+			return nil, err
+		}
+		result, err := DeleteChapter(tx, u.UserId, id)
+		if err != nil {
+			return nil, err
+		}
+		return gin.H{"deleted": result}, nil
+	}))
+}
diff --git a/server/app/lexgo/edit_test.go b/server/app/lexgo/edit_test.go
new file mode 100644
index 0000000..5a8e4d6
--- /dev/null
+++ b/server/app/lexgo/edit_test.go
@@ -0,0 +1,543 @@
+package lexgo
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+const editFixtureText = "Mira opened the workshop.\nThe sign read “A small step…”\n"
+
+func TestEditTitleRules(t *testing.T) {
+	if title, err := editTitle("  A small step  "); err != nil || title != "A small step" {
+		t.Fatalf("trimmed title: %q %v", title, err)
+	}
+	if _, err := editTitle("   "); err == nil {
+		t.Fatal("an empty title must be rejected")
+	}
+	if _, err := editTitle(strings.Repeat("a", maxTitleRunes+1)); err == nil {
+		t.Fatal("a title over the limit must be rejected")
+	}
+	if _, err := editTitle(strings.Repeat("a", maxTitleRunes)); err != nil {
+		t.Fatalf("the exact title limit must be accepted: %v", err)
+	}
+}
+
+func patchResource(t *testing.T, r *gin.Engine, token, path string, body any) (int, string, json.RawMessage) {
+	t.Helper()
+	return callRaw(t, r, "PATCH", path, token, body)
+}
+
+func existingTitle(t *testing.T, r *gin.Engine, token string, bookID int64) string {
+	t.Helper()
+	code, detail := bookDetail(t, r, token, bookID)
+	if code != 200 {
+		t.Fatalf("book detail status %d", code)
+	}
+	return detail.Book.Title
+}
+
+// TestMySQLRenameBookAndChapter covers renaming only: the text and the processing state stay
+// exactly as they were.
+func TestMySQLRenameBookAndChapter(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	other := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, pasted := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "rename-fixture-0001", "title": "Before Rename", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste status %d", code)
+	}
+	drainIngest(t, db)
+	before := chapterRow(t, db, pasted.Chapter.ID)
+
+	code, msg, data := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/books/%d", pasted.Book.ID), map[string]string{"title": "  After Rename  "})
+	if code != 200 {
+		t.Fatalf("rename book status %d (%s)", code, msg)
+	}
+	var renamed struct {
+		Book struct {
+			ID    int64
+			Title string
+		}
+	}
+	json.Unmarshal(data, &renamed)
+	if renamed.Book.Title != "After Rename" || existingTitle(t, r, learner.Token, pasted.Book.ID) != "After Rename" {
+		t.Fatalf("renamed book %+v", renamed.Book)
+	}
+
+	code, msg, data = patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]string{"title": "Chapter Two"})
+	if code != 200 {
+		t.Fatalf("rename chapter status %d (%s)", code, msg)
+	}
+	var edited ChapterEdit
+	json.Unmarshal(data, &edited)
+	if edited.Chapter.Title != "Chapter Two" || edited.VersionChanged || edited.Job != nil {
+		t.Fatalf("rename must not re-process: %+v", edited)
+	}
+	after := chapterRow(t, db, pasted.Chapter.ID)
+	if after.Title != "Chapter Two" || after.Status != statusReady || after.ContentSHA256 != before.ContentSHA256 || after.OriginalText != before.OriginalText {
+		t.Fatalf("rename changed the content state: %+v", after)
+	}
+	var jobs int64
+	db.Model(&IngestJob{}).Where("chapter_id = ?", pasted.Chapter.ID).Count(&jobs)
+	if jobs != 1 {
+		t.Fatalf("a rename created %d jobs", jobs)
+	}
+
+	// Validation and ownership.
+	for _, body := range []map[string]string{{"title": "   "}, {"title": strings.Repeat("a", maxTitleRunes+1)}} {
+		if code, _, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/books/%d", pasted.Book.ID), body); code != 400 {
+			t.Fatalf("invalid rename %v accepted", body)
+		}
+	}
+	if code, _, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/books/%d", pasted.Book.ID), map[string]any{"title": "x", "ownerId": 9}); code != 400 {
+		t.Fatal("an unknown field must be rejected")
+	}
+	if code, _, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/books/%d", pasted.Book.ID), map[string]any{"name": "x"}); code != 400 {
+		t.Fatal("a missing title must be rejected")
+	}
+	if code, _, _ := patchResource(t, r, other.Token, fmt.Sprintf("/api/v1/books/%d", pasted.Book.ID), map[string]string{"title": "Stolen"}); code != 404 {
+		t.Fatal("another account must not rename this book")
+	}
+	if code, _, _ := patchResource(t, r, other.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]string{"title": "Stolen"}); code != 404 {
+		t.Fatal("another account must not rename this chapter")
+	}
+	if code, _, _ := patchResource(t, r, "", fmt.Sprintf("/api/v1/books/%d", pasted.Book.ID), map[string]string{"title": "Anonymous"}); code != 401 {
+		t.Fatal("renaming requires a session")
+	}
+	if title := existingTitle(t, r, learner.Token, pasted.Book.ID); title != "After Rename" {
+		t.Fatalf("a rejected rename changed the book: %q", title)
+	}
+}
+
+// TestMySQLChapterEditVersioning is the core of the ticket: an edit creates a new version, and
+// the older run must not fail or publish over it.
+func TestMySQLChapterEditVersioning(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, pasted := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "edit-fixture-0001", "title": "Editable", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste status %d", code)
+	}
+	// The first run is claimed but not finished, so the edit lands while it is in flight.
+	clock := time.Now().UTC().Truncate(time.Millisecond)
+	job, claimed, err := ClaimNextIngestJob(db, clock)
+	if err != nil || !claimed || job.ChapterID != pasted.Chapter.ID {
+		t.Fatalf("claim (claimed=%v): %v", claimed, err)
+	}
+
+	newText := "Mira reopened the workshop.\r\n\r\nA newer version of the text.\n"
+	code, msg, data := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]string{"text": newText})
+	if code != 200 {
+		t.Fatalf("edit status %d (%s)", code, msg)
+	}
+	var edited ChapterEdit
+	json.Unmarshal(data, &edited)
+	if !edited.VersionChanged || edited.Job == nil || edited.Chapter.Status != statusPending {
+		t.Fatalf("edit must queue a new version: %+v", edited)
+	}
+	row := chapterRow(t, db, pasted.Chapter.ID)
+	if row.OriginalText != newText || row.ContentSHA256 != contentSHA(newText) || row.Status != statusPending || row.CharCount != len([]rune(newText)) {
+		t.Fatalf("stored version: %+v", row)
+	}
+	if row.ID != pasted.Chapter.ID {
+		t.Fatal("an edit must keep the chapter id, so the reading entry stays the same")
+	}
+
+	// The in-flight run belongs to the previous version: it must not touch the chapter.
+	if err := FinishIngestJob(t.Context(), db, job, clock.Add(time.Second)); err != nil {
+		t.Fatalf("finishing the older run must not fail: %v", err)
+	}
+	var stale IngestJob
+	if err := db.First(&stale, job.ID).Error; err != nil {
+		t.Fatal(err)
+	}
+	if stale.Status != statusFailed || stale.ErrorReason != reasonSuperseded {
+		t.Fatalf("the older run must be marked superseded: %+v", stale)
+	}
+	if row = chapterRow(t, db, pasted.Chapter.ID); row.Status != statusPending || row.ErrorReason != "" || row.OriginalText != newText {
+		t.Fatalf("the older run changed the newer version: %+v", row)
+	}
+	// Retrying the superseded job is refused instead of reprocessing old text.
+	code, _, _ = callRaw(t, r, "POST", fmt.Sprintf("/api/v1/jobs/%d/retry", stale.ID), learner.Token, nil)
+	if code != 409 {
+		t.Fatalf("retrying a superseded job: %d", code)
+	}
+
+	// The new version publishes normally and the reader shows the new text.
+	drainIngest(t, db)
+	code, reader := readChapter(t, r, learner.Token, pasted.Chapter.ID)
+	if code != 200 || reader.Chapter.Status != statusReady || reader.Chapter.OriginalText != newText {
+		t.Fatalf("new version: status %d, %+v", code, reader.Chapter)
+	}
+
+	// Saving the same text again is not a new version.
+	var jobsBefore int64
+	db.Model(&IngestJob{}).Where("chapter_id = ?", pasted.Chapter.ID).Count(&jobsBefore)
+	code, _, data = patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]string{"text": newText})
+	json.Unmarshal(data, &edited)
+	if code != 200 || edited.VersionChanged || edited.Job != nil {
+		t.Fatalf("an unchanged text must not create a version: %+v", edited)
+	}
+	var jobsAfter int64
+	db.Model(&IngestJob{}).Where("chapter_id = ?", pasted.Chapter.ID).Count(&jobsAfter)
+	if jobsAfter != jobsBefore {
+		t.Fatalf("an unchanged text created a job: %d -> %d", jobsBefore, jobsAfter)
+	}
+	if row = chapterRow(t, db, pasted.Chapter.ID); row.Status != statusReady {
+		t.Fatalf("an unchanged save changed the status: %+v", row)
+	}
+
+	// Text rules match a paste, and an empty body is refused.
+	for _, body := range []map[string]string{{"text": "   \n\t "}, {"text": strings.Repeat("a", maxChapterRunes+1)}} {
+		if code, _, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), body); code != 400 {
+			t.Fatalf("invalid text %v accepted", body)
+		}
+	}
+	if code, _, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]string{}); code != 400 {
+		t.Fatal("an empty edit must be rejected")
+	}
+	if code, _, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]any{"text": "Body.\n", "ownerId": 9}); code != 400 {
+		t.Fatal("an unknown field must be rejected")
+	}
+}
+
+func TestMySQLChapterSourceAnyStatus(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	other := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, pasted := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "source-fixture-0001", "title": "Source", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste status %d", code)
+	}
+	readSource := func(token string, chapterID int64) (int, ChapterSource) {
+		code, _, data := callRaw(t, r, "GET", fmt.Sprintf("/api/v1/chapters/%d/source", chapterID), token, nil)
+		var payload struct {
+			Source ChapterSource
+		}
+		if len(data) > 0 {
+			json.Unmarshal(data, &payload)
+		}
+		return code, payload.Source
+	}
+	// A pending chapter has no reading text, but its edit source is available to its owner.
+	if code, source := readSource(learner.Token, pasted.Chapter.ID); code != 200 || source.Text != editFixtureText || source.Status != statusPending || source.ContentSHA256 != contentSHA(editFixtureText) {
+		t.Fatalf("pending source: %d %+v", code, source)
+	}
+	drainIngest(t, db)
+	if code, source := readSource(learner.Token, pasted.Chapter.ID); code != 200 || source.Status != statusReady || source.CharCount != len([]rune(editFixtureText)) {
+		t.Fatalf("ready source: %d %+v", code, source)
+	}
+	if code, _ := readSource(other.Token, pasted.Chapter.ID); code != 404 {
+		t.Fatal("another account must not read this source")
+	}
+	if code, _, _ := callRaw(t, r, "GET", fmt.Sprintf("/api/v1/chapters/%d/source?id=1", pasted.Chapter.ID), learner.Token, nil); code != 400 {
+		t.Fatal("the source endpoint must reject query parameters")
+	}
+	if code, _ := readSource(learner.Token, 999999); code != 404 {
+		t.Fatal("an unknown chapter must be 404")
+	}
+}
+
+// TestMySQLDeleteChapterRenumbers closes the gap in the order and keeps personal records.
+func TestMySQLDeleteChapterRenumbers(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	other := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, first := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "delete-fixture-0001", "title": "Three Chapters", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("first paste %d", code)
+	}
+	second := pasteInto(t, r, learner.Token, first.Book.ID, "delete-fixture-0002", "Second", "Second chapter body.\n")
+	third := pasteInto(t, r, learner.Token, first.Book.ID, "delete-fixture-0003", "Third", "Third chapter body.\n")
+	drainIngest(t, db)
+	// One personal word in the chapter that will be deleted, plus one in a surviving chapter.
+	saved := saveWord(t, r, learner.Token, second.Chapter.ID, 0, 6, termStatusNew, nil)
+	survivor := saveWord(t, r, learner.Token, first.Chapter.ID, 0, 4, termStatusNew, nil)
+	before := termReviewRow(t, db, saved.Term.ID)
+
+	code, msg, data := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/chapters/%d", second.Chapter.ID), learner.Token, nil)
+	if code != 200 {
+		t.Fatalf("delete chapter status %d (%s)", code, msg)
+	}
+	var deleted struct {
+		Deleted DeletionResult
+	}
+	json.Unmarshal(data, &deleted)
+	if deleted.Deleted.ChapterID != second.Chapter.ID || deleted.Deleted.Remaining != 2 || deleted.Deleted.BookID != first.Book.ID {
+		t.Fatalf("delete result: %+v", deleted.Deleted)
+	}
+	// The remaining chapters are contiguous and in the original order.
+	code, detail := bookDetail(t, r, learner.Token, first.Book.ID)
+	if code != 200 || len(detail.Chapters) != 2 {
+		t.Fatalf("book detail after delete: %d %+v", code, detail.Chapters)
+	}
+	if detail.Chapters[0].ID != first.Chapter.ID || detail.Chapters[0].Ordinal != 1 || detail.Chapters[1].ID != third.Chapter.ID || detail.Chapters[1].Ordinal != 2 {
+		t.Fatalf("renumbered chapters: %+v", detail.Chapters)
+	}
+	// Navigation follows the new order, and the deleted chapter is gone with its job.
+	code, reader := readChapter(t, r, learner.Token, first.Chapter.ID)
+	if code != 200 || reader.Navigation.NextChapterID == nil || *reader.Navigation.NextChapterID != third.Chapter.ID {
+		t.Fatalf("navigation after delete: %d %+v", code, reader.Navigation)
+	}
+	if code, _ := readChapter(t, r, learner.Token, second.Chapter.ID); code != 404 {
+		t.Fatal("a deleted chapter must be gone")
+	}
+	var jobs int64
+	db.Model(&IngestJob{}).Where("chapter_id = ?", second.Chapter.ID).Count(&jobs)
+	if jobs != 0 {
+		t.Fatalf("the deleted chapter kept %d jobs", jobs)
+	}
+	// Personal records survive the deletion, including the schedule.
+	var terms int64
+	db.Model(&Term{}).Where("id IN ?", []int64{saved.Term.ID, survivor.Term.ID}).Count(&terms)
+	var reviews int64
+	db.Model(&TermReview{}).Where("term_id = ?", saved.Term.ID).Count(&reviews)
+	if terms != 2 || reviews != 1 {
+		t.Fatalf("deleting a chapter changed personal records: terms=%d reviews=%d", terms, reviews)
+	}
+	if after := termReviewRow(t, db, saved.Term.ID); !after.DueAt.Equal(before.DueAt) || after.ReviewCount != before.ReviewCount {
+		t.Fatalf("the review schedule changed: %+v -> %+v", before, after)
+	}
+	// Repeated and foreign deletions.
+	if code, _, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/chapters/%d", second.Chapter.ID), learner.Token, nil); code != 404 {
+		t.Fatal("a repeated delete must be 404")
+	}
+	if code, _, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/chapters/%d", first.Chapter.ID), other.Token, nil); code != 404 {
+		t.Fatal("another account must not delete this chapter")
+	}
+	if code, _, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/chapters/%d", first.Chapter.ID), "", nil); code != 401 {
+		t.Fatal("deleting requires a session")
+	}
+	if code, detail := bookDetail(t, r, learner.Token, first.Book.ID); code != 200 || len(detail.Chapters) != 2 {
+		t.Fatalf("a rejected delete changed the book: %+v", detail.Chapters)
+	}
+}
+
+// pasteInto appends one chapter to an owned book.
+func pasteInto(t *testing.T, r *gin.Engine, token string, bookID int64, requestID, title, text string) pasteResponse {
+	t.Helper()
+	code, pasted := pasteChapter(t, r, token, bookID, map[string]string{"requestId": requestID, "title": title, "text": text})
+	if code != 201 {
+		t.Fatalf("append %s status %d", title, code)
+	}
+	return pasted
+}
+
+func TestMySQLDeleteBookKeepsPersonalRecords(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	other := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, first := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "delete-book-0001", "title": "Doomed Book", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste %d", code)
+	}
+	pasteInto(t, r, learner.Token, first.Book.ID, "delete-book-0002", "Second", "Second chapter body.\n")
+	drainIngest(t, db)
+	saved := saveWord(t, r, learner.Token, first.Chapter.ID, 0, 4, termStatusNew, nil)
+	survivorBook := pasteInto(t, r, learner.Token, first.Book.ID, "delete-book-0003", "Third", "Third body.\n")
+	otherBook := func() int64 {
+		code, kept := pasteBook(t, r, learner.Token, map[string]string{
+			"requestId": "delete-book-keep", "title": "Kept Book", "text": "Kept body.\n", "language": "en"})
+		if code != 201 {
+			t.Fatalf("kept book %d", code)
+		}
+		return kept.Book.ID
+	}()
+	drainIngest(t, db)
+
+	code, msg, data := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/books/%d", first.Book.ID), learner.Token, nil)
+	if code != 200 {
+		t.Fatalf("delete book status %d (%s)", code, msg)
+	}
+	var deleted struct {
+		Deleted DeletionResult
+	}
+	json.Unmarshal(data, &deleted)
+	if deleted.Deleted.BookID != first.Book.ID || deleted.Deleted.Chapters != 3 {
+		t.Fatalf("delete result: %+v", deleted.Deleted)
+	}
+	var books, chapters, jobs int64
+	db.Model(&Book{}).Where("id = ?", first.Book.ID).Count(&books)
+	db.Model(&Chapter{}).Where("book_id = ?", first.Book.ID).Count(&chapters)
+	db.Model(&IngestJob{}).Where("book_id = ?", first.Book.ID).Count(&jobs)
+	if books != 0 || chapters != 0 || jobs != 0 {
+		t.Fatalf("the deleted book left rows: books=%d chapters=%d jobs=%d", books, chapters, jobs)
+	}
+	// The other book of the same account is untouched.
+	if code, detail := bookDetail(t, r, learner.Token, otherBook); code != 200 || len(detail.Chapters) != 1 {
+		t.Fatalf("the other book changed: %d %+v", code, detail.Chapters)
+	}
+	// Personal records and their schedule survive.
+	var terms, reviews int64
+	db.Model(&Term{}).Where("owner_id = ?", learner.ID).Count(&terms)
+	db.Model(&TermReview{}).Where("term_id = ?", saved.Term.ID).Count(&reviews)
+	if terms != 1 || reviews != 1 {
+		t.Fatalf("deleting a book changed personal records: terms=%d reviews=%d", terms, reviews)
+	}
+	code, queue := reviewQueue(t, r, learner.Token)
+	if code != 200 || len(queue.Items) != 1 || queue.Items[0].ID != saved.Term.ID {
+		t.Fatalf("the saved word left the review queue: %d %+v", code, queue.Items)
+	}
+	// The deleted chapter and book are no longer readable, and repeats are 404.
+	if code, _ := readChapter(t, r, learner.Token, survivorBook.Chapter.ID); code != 404 {
+		t.Fatal("a chapter of the deleted book must be gone")
+	}
+	if code, _, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/books/%d", first.Book.ID), learner.Token, nil); code != 404 {
+		t.Fatal("a repeated delete must be 404")
+	}
+	if code, _, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/books/%d", otherBook), other.Token, nil); code != 404 {
+		t.Fatal("another account must not delete this book")
+	}
+	_, list := bookList(t, r, other.Token)
+	if len(list.Items) != 0 {
+		t.Fatalf("the other account must not see this library: %+v", list.Items)
+	}
+}
+
+// TestMySQLDeleteDuringProcessing proves a deleted chapter cannot come back through a run
+// that was already in flight.
+func TestMySQLDeleteDuringProcessing(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, pasted := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "delete-processing-01", "title": "In Flight", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste %d", code)
+	}
+	clock := time.Now().UTC().Truncate(time.Millisecond)
+	job, claimed, err := ClaimNextIngestJob(db, clock)
+	if err != nil || !claimed {
+		t.Fatalf("claim: %v", err)
+	}
+	if code, msg, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), learner.Token, nil); code != 200 {
+		t.Fatalf("deleting a processing chapter: %d (%s)", code, msg)
+	}
+	// The in-flight run finds nothing to publish and reports no error.
+	if err := FinishIngestJob(t.Context(), db, job, clock.Add(time.Second)); err != nil {
+		t.Fatalf("finishing a run for a deleted chapter: %v", err)
+	}
+	var chapters, jobs int64
+	db.Model(&Chapter{}).Where("id = ?", pasted.Chapter.ID).Count(&chapters)
+	db.Model(&IngestJob{}).Where("id = ?", job.ID).Count(&jobs)
+	if chapters != 0 || jobs != 0 {
+		t.Fatalf("a deleted chapter came back: chapters=%d jobs=%d", chapters, jobs)
+	}
+	// The book stays, with no chapters and a clear empty state for the client.
+	code, detail := bookDetail(t, r, learner.Token, pasted.Book.ID)
+	if code != 200 || len(detail.Chapters) != 0 {
+		t.Fatalf("book after deleting its only chapter: %d %+v", code, detail.Chapters)
+	}
+}
+
+// TestMySQLConcurrentChapterDelete checks two deletions of one chapter in one book.
+func TestMySQLConcurrentChapterDelete(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, first := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "race-delete-0001", "title": "Race", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste %d", code)
+	}
+	pasteInto(t, r, learner.Token, first.Book.ID, "race-delete-0002", "Second", "Second body.\n")
+	drainIngest(t, db)
+
+	var wg sync.WaitGroup
+	codes := make(chan int, 2)
+	for i := 0; i < 2; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			c, _, _ := callRaw(t, r, "DELETE", fmt.Sprintf("/api/v1/chapters/%d", first.Chapter.ID), learner.Token, nil)
+			codes <- c
+		}()
+	}
+	wg.Wait()
+	close(codes)
+	ok, missing := 0, 0
+	for c := range codes {
+		switch c {
+		case 200:
+			ok++
+		case 404:
+			missing++
+		}
+	}
+	if ok != 1 || missing != 1 {
+		t.Fatalf("concurrent deletes: ok=%d missing=%d", ok, missing)
+	}
+	// The single surviving chapter keeps ordinal 1.
+	var remaining []Chapter
+	db.Where("book_id = ?", first.Book.ID).Order("ordinal ASC").Find(&remaining)
+	if len(remaining) != 1 || remaining[0].Ordinal != 1 {
+		t.Fatalf("ordinals after concurrent delete: %+v", remaining)
+	}
+}
+
+// TestMySQLRecoverySkipsSupersededJobs proves the recovery sweep leaves a newer version alone.
+func TestMySQLRecoverySkipsSupersededJobs(t *testing.T) {
+	db, r, owner := libraryFixture(t)
+	learner := newLearner(t, r, owner.Token)
+	drainIngest(t, db)
+
+	code, pasted := pasteBook(t, r, learner.Token, map[string]string{
+		"requestId": "recovery-fix-0001", "title": "Recovery", "text": editFixtureText, "language": "en"})
+	if code != 201 {
+		t.Fatalf("paste %d", code)
+	}
+	clock := time.Now().UTC().Truncate(time.Millisecond)
+	job, claimed, err := ClaimNextIngestJob(db, clock)
+	if err != nil || !claimed {
+		t.Fatalf("claim: %v", err)
+	}
+	newText := "A replacement body.\n"
+	if code, msg, _ := patchResource(t, r, learner.Token, fmt.Sprintf("/api/v1/chapters/%d", pasted.Chapter.ID), map[string]string{"text": newText}); code != 200 {
+		t.Fatalf("edit status %d (%s)", code, msg)
+	}
+	// The old job looks stale to the sweep; it must be abandoned, not requeued.
+	requeued, err := RequeueStaleIngestJobs(db, clock.Add(ingestStaleAfter+time.Second))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if requeued != 0 {
+		t.Fatalf("the sweep requeued %d superseded job(s)", requeued)
+	}
+	var stale IngestJob
+	if err := db.First(&stale, job.ID).Error; err != nil {
+		t.Fatal(err)
+	}
+	if stale.Status != statusFailed || stale.ErrorReason != reasonSuperseded {
+		t.Fatalf("the sweep left the old job %+v", stale)
+	}
+	if row := chapterRow(t, db, pasted.Chapter.ID); row.Status != statusPending || row.OriginalText != newText {
+		t.Fatalf("the sweep changed the new version: %+v", row)
+	}
+	drainIngest(t, db)
+	if row := chapterRow(t, db, pasted.Chapter.ID); row.Status != statusReady || row.OriginalText != newText {
+		t.Fatalf("the new version did not publish: %+v", row)
+	}
+}
diff --git a/server/app/lexgo/ingest.go b/server/app/lexgo/ingest.go
index dd485a3..96306e4 100644
--- a/server/app/lexgo/ingest.go
+++ b/server/app/lexgo/ingest.go
@@ -47,13 +47,19 @@ func requeueStaleIngestJobs(db *gorm.DB, now time.Time, staleAfter time.Duration
 	cutoff := stamp(now.Add(-staleAfter))
 	var requeued int64
 	err := db.Transaction(func(tx *gorm.DB) error {
+		if err := abandonSupersededJobs(tx, ts); err != nil {
+			return err
+		}
 		if err := exhaustIngestJobs(tx, ts); err != nil {
 			return err
 		}
 		stale := []int64{}
-		if err := tx.Model(&IngestJob{}).
-			Where("status = ? AND attempts < ? AND updated_at <= ?", statusProcessing, maxIngestAttempts, cutoff).
-			Pluck("id", &stale).Error; err != nil {
+		// Only jobs that still describe the chapter's current version may be requeued: an
+		// interrupted run of an older version must not pull the newer text back into processing.
+		if err := tx.Table("lexgo_ingest_jobs AS j").
+			Joins("JOIN lexgo_chapters AS c ON c.id = j.chapter_id AND c.content_sha256 = j.content_sha256").
+			Where("j.status = ? AND j.attempts < ? AND j.updated_at <= ?", statusProcessing, maxIngestAttempts, cutoff).
+			Pluck("j.id", &stale).Error; err != nil {
 			return err
 		}
 		if len(stale) == 0 {
@@ -111,10 +117,21 @@ func ClaimNextIngestJob(db *gorm.DB, now time.Time) (IngestJob, bool, error) {
 	ts := stamp(now)
 	var job IngestJob
 	err := db.Transaction(func(tx *gorm.DB) error {
-		if err := tx.Where("status = ? AND attempts < ?", statusPending, maxIngestAttempts).
-			Order("id ASC").First(&job).Error; err != nil {
+		if err := abandonSupersededJobs(tx, ts); err != nil {
 			return err
 		}
+		// A job may only process the version it was created for, so the chapter join is part
+		// of the claim and an edited chapter is never dragged back to processing.
+		if err := tx.Table("lexgo_ingest_jobs AS j").
+			Select("j.id, j.owner_id, j.book_id, j.chapter_id, j.request_key, j.content_sha256, j.status, j.attempts, j.error_reason, j.created_at, j.updated_at, j.finished_at").
+			Joins("JOIN lexgo_chapters AS c ON c.id = j.chapter_id AND c.content_sha256 = j.content_sha256").
+			Where("j.status = ? AND j.attempts < ?", statusPending, maxIngestAttempts).
+			Order("j.id ASC").Limit(1).Find(&job).Error; err != nil {
+			return err
+		}
+		if job.ID == 0 {
+			return errNoIngestJob
+		}
 		claim := tx.Model(&IngestJob{}).Where("id = ? AND status = ?", job.ID, statusPending).
 			Updates(map[string]any{"status": statusProcessing, "attempts": gorm.Expr("attempts + 1"), "updated_at": ts})
 		if claim.Error != nil {
@@ -123,7 +140,7 @@ func ClaimNextIngestJob(db *gorm.DB, now time.Time) (IngestJob, bool, error) {
 		if claim.RowsAffected != 1 {
 			return errJobTaken
 		}
-		if err := tx.Model(&Chapter{}).Where("id = ? AND owner_id = ?", job.ChapterID, job.OwnerID).
+		if err := tx.Model(&Chapter{}).Where("id = ? AND owner_id = ? AND content_sha256 = ?", job.ChapterID, job.OwnerID, job.ContentSHA256).
 			Updates(map[string]any{"status": statusProcessing, "updated_at": ts}).Error; err != nil {
 			return err
 		}
@@ -132,7 +149,7 @@ func ClaimNextIngestJob(db *gorm.DB, now time.Time) (IngestJob, bool, error) {
 		job.UpdatedAt = ts
 		return nil
 	})
-	if errors.Is(err, gorm.ErrRecordNotFound) || errors.Is(err, errJobTaken) {
+	if errors.Is(err, gorm.ErrRecordNotFound) || errors.Is(err, errJobTaken) || errors.Is(err, errNoIngestJob) {
 		return IngestJob{}, false, nil
 	}
 	if err != nil {
@@ -143,6 +160,9 @@ func ClaimNextIngestJob(db *gorm.DB, now time.Time) (IngestJob, bool, error) {
 
 var errJobTaken = errors.New("ingestion job already claimed")
 
+// errNoIngestJob reports an empty queue, which is not a failure.
+var errNoIngestJob = errors.New("no ingestion job to claim")
+
 // FinishIngestJob validates the persisted chapter and publishes it, or records a fixed
 // failure reason. The check runs again here because a worker must not trust that content
 // reached the table through the paste API.
@@ -150,12 +170,27 @@ func FinishIngestJob(ctx context.Context, db *gorm.DB, job IngestJob, now time.T
 	ts := stamp(now)
 	return db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		var chapter Chapter
-		if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).
-			Where("id = ? AND owner_id = ?", job.ChapterID, job.OwnerID).First(&chapter).Error; err != nil {
+		err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).
+			Where("id = ? AND owner_id = ?", job.ChapterID, job.OwnerID).First(&chapter).Error
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			// The chapter was deleted while this run was in flight; the cascade removed its
+			// jobs too, so there is nothing left to publish.
+			return nil
+		}
+		if err != nil {
 			return err
 		}
+		if chapter.ContentSHA256 != job.ContentSHA256 {
+			// The chapter moved to a newer version: publish nothing and leave its state, which
+			// belongs to the newer job, untouched.
+			return tx.Model(&IngestJob{}).Where("id = ?", job.ID).Updates(map[string]any{
+				"status": statusFailed, "error_reason": reasonSuperseded, "updated_at": ts, "finished_at": ts}).Error
+		}
 		var book Book
 		if err := tx.Where("id = ? AND owner_id = ?", job.BookID, job.OwnerID).First(&book).Error; err != nil {
+			if errors.Is(err, gorm.ErrRecordNotFound) {
+				return nil
+			}
 			return err
 		}
 		if reason := unprocessableReason(book, chapter, job); reason != "" {
@@ -185,14 +220,25 @@ func unprocessableReason(book Book, chapter Chapter, job IngestJob) string {
 	if utf8.RuneCountInString(chapter.OriginalText) > maxChapterRunes {
 		return reasonTooLong
 	}
-	// The job accepted a specific content version; a chapter changed after submission is a
-	// different paste and must be submitted again rather than silently processed.
-	if contentSHA(chapter.OriginalText) != job.ContentSHA256 {
+	// The stored text and its stored version must agree. The job-versus-chapter version check
+	// ran before this function, so a direct write that changed the text without updating its
+	// version is the remaining case, and it is a different paste rather than this version.
+	if contentSHA(chapter.OriginalText) != chapter.ContentSHA256 {
 		return reasonContentChanged
 	}
 	return ""
 }
 
+// abandonSupersededJobs fails jobs whose version is no longer the chapter's version. They
+// must never publish or fail the chapter, because another job owns its current state. It is
+// one multi-table statement: GORM's Updates does not carry a Joins clause into an UPDATE.
+func abandonSupersededJobs(tx *gorm.DB, ts time.Time) error {
+	return tx.Exec(`UPDATE lexgo_ingest_jobs j JOIN lexgo_chapters c ON c.id = j.chapter_id
+		SET j.status = ?, j.error_reason = ?, j.updated_at = ?, j.finished_at = ?
+		WHERE j.status IN (?, ?) AND j.content_sha256 <> c.content_sha256`,
+		statusFailed, reasonSuperseded, ts, ts, statusPending, statusProcessing).Error
+}
+
 // ProcessIngestJobs drains up to limit pending jobs. Claiming and finishing each use their
 // own transaction, so an interrupted run simply leaves a job for recovery.
 func ProcessIngestJobs(ctx context.Context, db *gorm.DB, now func() time.Time, limit int) (int, error) {
diff --git a/server/app/lexgo/library.go b/server/app/lexgo/library.go
index 956f75d..1ac731a 100644
--- a/server/app/lexgo/library.go
+++ b/server/app/lexgo/library.go
@@ -30,7 +30,9 @@ const (
 	reasonTooLong             = "too_long"
 	reasonEmptyText           = "empty_text"
 	reasonContentChanged      = "content_changed"
-	reasonAttemptsExhausted   = "attempts_exhausted"
+	// reasonSuperseded marks a job whose chapter already moved to a newer content version.
+	reasonSuperseded        = "superseded"
+	reasonAttemptsExhausted = "attempts_exhausted"
 )
 
 const (
@@ -53,6 +55,8 @@ func reasonMessage(reason string) string {
 		return "内容超过单章上限（100000 个字符）"
 	case reasonEmptyText:
 		return "章节内容为空"
+	case reasonSuperseded:
+		return "章节内容已更新为新版本，本次处理已作废"
 	case reasonContentChanged:
 		return "内容在处理前发生变化，请重新提交"
 	case reasonAttemptsExhausted:
@@ -640,6 +644,11 @@ func RetryIngestJob(db *gorm.DB, owner int, jobID int64, now time.Time) (JobView
 			Where("id = ? AND owner_id = ?", job.ChapterID, owner).First(&chapter).Error; err != nil {
 			return err
 		}
+		// A job of an older content version is gone for good: retrying it would process text
+		// the chapter no longer holds, so the newer job owns the chapter instead.
+		if chapter.ContentSHA256 != job.ContentSHA256 {
+			return failure(409, "该任务对应的是旧版本，请刷新后重试当前版本")
+		}
 		if err := tx.Model(&IngestJob{}).Where("id = ?", job.ID).
 			Updates(map[string]any{"status": statusPending, "error_reason": "", "attempts": 0,
 				"updated_at": ts, "finished_at": nil}).Error; err != nil {
diff --git a/server/app/lexgo/router.go b/server/app/lexgo/router.go
index a568399..8a39adb 100644
--- a/server/app/lexgo/router.go
+++ b/server/app/lexgo/router.go
@@ -305,6 +305,7 @@ func Router(db *gorm.DB, now func() time.Time) *gin.Engine {
 	registerTermRoutes(v, protect, now)
 	registerReviewRoutes(v, protect, now)
 	registerUploadRoutes(v, protect, now)
+	registerEditRoutes(v, protect, now)
 	r.NoRoute(func(c *gin.Context) { respond(c, 404, nil, failure(404, "页面或接口不存在")) })
 	return r
 }