diff --git a/frontend/src/app/admin/ArticleManager.tsx b/frontend/src/app/admin/ArticleManager.tsx
index 9f8cd61..62dd69a 100644
--- a/frontend/src/app/admin/ArticleManager.tsx
+++ b/frontend/src/app/admin/ArticleManager.tsx
@@ -5,9 +5,9 @@ import { FormEvent, useEffect, useMemo, useState } from 'react';
 type Row = {
   content_id: string; title: string; publish_status: string; created_at: string; updated_at: string;
   category?: string | null; tags?: string | null; author?: string | null; published_at?: string | null;
-  source: 'content_system' | 'manual'; public_path: string;
+  source: 'content_system' | 'manual'; public_path: string; summary?: string | null;
 };
-type Draft = { content_id: string; title: string; body: string; publish_status: string; category: string; tags: string; author: string; published_at: string; source?: Row['source'] };
+type Draft = { content_id: string; title: string; body: string; publish_status: string; category: string; tags: string; author: string; published_at: string; summary: string; source?: Row['source'] };
 type Request = (path: string, options?: RequestInit) => Promise<any>;
 
 const STATUS: Record<string, string> = { published: '已发布', draft: '草稿', review: '审核中', unpublished: '已下线', historical: '历史版本' };
@@ -26,7 +26,7 @@ function toText(value?: string | null) {
   const date = new Date(value);
   return Number.isNaN(date.getTime()) ? value : date.toLocaleString('zh-CN', { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit' });
 }
-const empty = (): Draft => ({ content_id: '', title: '', body: '', publish_status: 'draft', category: '', tags: '', author: '阿美巴', published_at: '' });
+const empty = (): Draft => ({ content_id: '', title: '', body: '', publish_status: 'draft', category: '', tags: '', author: '阿美巴', published_at: '', summary: '' });
 
 /** Articles: search, filter, publish or take offline, edit, and delete one or many. */
 export function ArticleManager({ request, onMessage, onError }: { request: Request; onMessage: (text: string) => void; onError: (text: string) => void }) {
@@ -72,23 +72,24 @@ export function ArticleManager({ request, onMessage, onError }: { request: Reque
   function toggle(row: Row) {
     const next = row.publish_status === 'published' ? 'unpublished' : 'published';
     void run(() => request(`/api/admin/contents/article/${row.content_id}`, { method: 'PUT', body: JSON.stringify({ publish_status: next }) }),
-      next === 'published' ? '文章已上线。' : '文章已下线，网站上不再显示。');
+      next === 'published' ? '文章已上线，网站约 1 分钟内显示。' : '文章已下线，网站约 1 分钟内不再显示。');
   }
   async function edit(row: Row) {
     try {
       const full = await request(`/api/admin/contents/article/${row.content_id}`);
       setEditing({ content_id: row.content_id, title: full.title || '', body: full.body || '', publish_status: full.publish_status || 'draft',
-        category: full.category || '', tags: full.tags || '', author: full.author || '', published_at: toInput(full.published_at), source: row.source });
+        category: full.category || '', tags: full.tags || '', author: full.author || '', published_at: toInput(full.published_at), summary: row.summary || '', source: row.source });
     } catch (e: any) { onError(e.message); }
   }
   async function save(event: FormEvent) {
     event.preventDefault();
     if (!editing) return;
     const data = { title: editing.title.trim(), body: editing.body, publish_status: editing.publish_status, category: editing.category,
-      tags: editing.tags, author: editing.author, published_at: editing.published_at ? `${editing.published_at.replace('T', ' ')}:00` : '' };
+      tags: editing.tags, author: editing.author, published_at: editing.published_at ? `${editing.published_at.replace('T', ' ')}:00` : '',
+      ...(editing.source === 'content_system' ? { summary: editing.summary } : {}) };
     const path = editing.content_id ? `/api/admin/contents/article/${editing.content_id}` : '/api/admin/contents/article';
     await run(async () => { await request(path, { method: editing.content_id ? 'PUT' : 'POST', body: JSON.stringify(data) }); setEditing(null); },
-      editing.content_id ? '修改已保存，网站上立即生效。' : '文章已新增。');
+      editing.content_id ? '修改已保存，网站约 1 分钟内更新。' : '文章已新增。');
   }
 
   return <div className="article-manager">
@@ -134,8 +135,9 @@ export function ArticleManager({ request, onMessage, onError }: { request: Reque
     {editing && <div className="article-editor-backdrop" role="presentation" onMouseDown={(e) => { if (e.target === e.currentTarget) setEditing(null); }}>
       <form className="editor-form article-editor" onSubmit={save} role="dialog" aria-modal="true" aria-label={editing.content_id ? '编辑文章' : '新增文章'}>
         <header><h3>{editing.content_id ? '编辑文章' : '新增文章'}</h3><button type="button" className="admin-quiet-button" onClick={() => setEditing(null)}>关闭</button></header>
-        {editing.source === 'content_system' && <p className="article-note">这篇文章来自内容系统。这里的修改会立即生效，但内容系统再次发布同一篇文章时会覆盖这里的修改。</p>}
+        {editing.source === 'content_system' && <p className="article-note">这篇文章来自内容系统。这里的修改约 1 分钟内在网站生效，但内容系统再次发布同一篇文章时会覆盖这里的修改。</p>}
         <label>标题<input value={editing.title} onChange={(e) => setEditing({ ...editing, title: e.target.value })} required /></label>
+        {editing.source === 'content_system' && <label>摘要（知识中心列表里显示）<textarea rows={3} value={editing.summary} onChange={(e) => setEditing({ ...editing, summary: e.target.value })} /></label>}
         <label>正文<small>{editing.body.replace(/\s/g, '').length} 字</small><textarea rows={16} value={editing.body} onChange={(e) => setEditing({ ...editing, body: e.target.value })} /></label>
         <div className="article-editor-grid">
           <label>分类<input value={editing.category} onChange={(e) => setEditing({ ...editing, category: e.target.value })} /></label>
diff --git a/frontend/src/app/admin/page.tsx b/frontend/src/app/admin/page.tsx
index bcca9e1..391047a 100644
--- a/frontend/src/app/admin/page.tsx
+++ b/frontend/src/app/admin/page.tsx
@@ -129,7 +129,8 @@ type Setting = { setting_key: string; setting_value: string; setting_group: stri
 
 async function request(path: string, token: string, options: RequestInit = {}) {
   const response = await fetch(`${API_URL}${path}`, { ...options, headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${token}`, ...(options.headers || {}) } });
-  const data = response.status === 204 ? null : await response.json();
+  const data = response.status === 204 ? null : await response.json().catch(() => null);
+  if (response.status === 401 && path !== '/api/admin/login') { window.dispatchEvent(new Event('ameiba-admin-unauthorized')); throw new Error('登录已过期，请重新登录。'); }
   if (!response.ok) throw new Error(data?.error || '操作没有完成，请稍后重试');
   return data;
 }
@@ -143,6 +144,7 @@ export default function AdminPage() {
   const [editing, setEditing] = useState<ContentItem | null>(null); const [details, setDetails] = useState<Record<string, string>>({}); const [currentPassword, setCurrentPassword] = useState(''); const [newPassword, setNewPassword] = useState('');
 
   useEffect(() => { const saved = window.localStorage.getItem('ameiba_admin_token'); if (saved) { setToken(saved); loadSettings(saved); } }, []);
+  useEffect(() => { const expired = () => { window.localStorage.removeItem('ameiba_admin_token'); setToken(''); setMessage(''); setError('登录已过期，请重新登录。'); }; window.addEventListener('ameiba-admin-unauthorized', expired); return () => window.removeEventListener('ameiba-admin-unauthorized', expired); }, []);
   async function loadSettings(authToken = token) { try { setSettings(await request('/api/admin/settings', authToken)); } catch (e: any) { setError(e.message); } }
   async function loadContents(contentType = type, authToken = token) { try { setContents((await request(`/api/admin/contents/${contentType}?pageSize=100`, authToken)).list || []); } catch (e: any) { setError(e.message); } }
   async function login(event: FormEvent) { event.preventDefault(); setError(''); try { const response = await fetch(`${API_URL}/api/admin/login`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ username, password }) }); const data = await response.json(); if (!response.ok) throw new Error(data.error || '用户名或密码错误'); window.localStorage.setItem('ameiba_admin_token', data.token); setToken(data.token); setPassword(''); await loadSettings(data.token); } catch (e: any) { setError(e.message); } }
diff --git a/src/database/migrate.js b/src/database/migrate.js
index 04e2f61..49a8cd0 100644
--- a/src/database/migrate.js
+++ b/src/database/migrate.js
@@ -165,6 +165,18 @@ const createTables = () => {
     )
   `);
 
+  // 管理员登录状态（存库，服务重启后不用重新登录）
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS admin_sessions (
+      token_hash CHAR(64) PRIMARY KEY,
+      user_id VARCHAR(36) NOT NULL,
+      username VARCHAR(64) NOT NULL,
+      expires_at BIGINT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      INDEX idx_admin_sessions_username (username)
+    )
+  `);
+
   // 前台可编辑站点配置
   db.exec(`
     CREATE TABLE IF NOT EXISTS site_settings (
diff --git a/src/models/Article.js b/src/models/Article.js
index 531ad0c..e3dbccb 100644
--- a/src/models/Article.js
+++ b/src/models/Article.js
@@ -86,6 +86,7 @@ class Article extends Content {
       const setClause = Object.keys(articleData).map(key => `${key} = ?`).join(', ');
       const values = Object.values(articleData);
       
+      db.prepare('INSERT IGNORE INTO articles (article_id) VALUES (?)').run(contentId);
       const stmt = db.prepare(`UPDATE articles SET ${setClause} WHERE article_id = ?`);
       stmt.run(...values, contentId);
     }
diff --git a/src/routes/adminRoutes.js b/src/routes/adminRoutes.js
index 1107124..49a002a 100644
--- a/src/routes/adminRoutes.js
+++ b/src/routes/adminRoutes.js
@@ -68,7 +68,7 @@ router.get('/articles', (req, res) => {
     const rows = db.prepare(`
       SELECT c.content_id, c.title, c.publish_status, c.created_at, c.updated_at,
         a.category, a.tags, a.author, a.published_at,
-        p.publication_id, p.slug, p.source_system
+        p.publication_id, p.slug, p.source_system, p.summary
       FROM contents c
       LEFT JOIN articles a ON a.article_id = c.content_id
       LEFT JOIN integration_publications p ON p.content_id = c.content_id
@@ -124,6 +124,9 @@ router.post('/contents/:type', (req, res) => {
 router.put('/contents/:type/:id', (req, res) => {
   try {
     const data = { ...req.body };
+    // The summary shown in the knowledge list belongs to the content system's publication record.
+    const summary = req.params.type === 'article' && typeof data.summary === 'string' ? data.summary.trim() : undefined;
+    delete data.summary;
     if (req.params.type === 'article') {
       // The admin form sends "2026-10-19T15:30" (local time); MySQL wants "2026-10-19 15:30:00".
       if (typeof data.published_at === 'string') {
@@ -137,7 +140,11 @@ router.put('/contents/:type/:id', (req, res) => {
         else delete data.published_at;
       }
     }
-    res.json(ContentService.update(req.params.id, data, req.params.type));
+    const updated = ContentService.update(req.params.id, data, req.params.type);
+    if (summary !== undefined) {
+      getDb().prepare('UPDATE integration_publications SET summary = ? WHERE content_id = ?').run(summary, req.params.id);
+    }
+    res.json(updated);
   } catch (error) {
     res.status(400).json({ error: error.message });
   }
diff --git a/src/services/AdminAuthService.js b/src/services/AdminAuthService.js
index 3e9fdc0..c753ae7 100644
--- a/src/services/AdminAuthService.js
+++ b/src/services/AdminAuthService.js
@@ -2,7 +2,9 @@ const crypto = require('crypto');
 const { v4: uuidv4 } = require('uuid');
 const { getDb } = require('../config/database');
 
-const sessions = new Map();
+const SESSION_MS = 8 * 60 * 60 * 1000;
+// Only a hash of the token is stored, so the table never holds a usable login.
+const tokenHash = (token) => crypto.createHash('sha256').update(String(token)).digest('hex');
 
 const hashPassword = (password, salt = crypto.randomBytes(16).toString('hex')) => {
   const hash = crypto.scryptSync(password, salt, 64).toString('hex');
@@ -23,17 +25,18 @@ class AdminAuthService {
       throw new Error('用户名或密码错误');
     }
     const token = crypto.randomBytes(32).toString('hex');
-    sessions.set(token, { userId: user.user_id, username: user.username, expiresAt: Date.now() + 8 * 60 * 60 * 1000 });
-    return { token, username: user.username, expiresIn: 8 * 60 * 60 };
+    const db = getDb();
+    db.prepare('DELETE FROM admin_sessions WHERE expires_at < ?').run(Date.now());
+    db.prepare('INSERT INTO admin_sessions (token_hash, user_id, username, expires_at) VALUES (?, ?, ?, ?)')
+      .run(tokenHash(token), user.user_id, user.username, Date.now() + SESSION_MS);
+    return { token, username: user.username, expiresIn: SESSION_MS / 1000 };
   }
 
   static verify(token) {
-    const session = sessions.get(token);
-    if (!session || session.expiresAt < Date.now()) {
-      if (token) sessions.delete(token);
-      return null;
-    }
-    return session;
+    if (!token) return null;
+    const row = getDb().prepare('SELECT user_id, username, expires_at FROM admin_sessions WHERE token_hash = ?').get(tokenHash(token));
+    if (!row || Number(row.expires_at) < Date.now()) return null;
+    return { userId: row.user_id, username: row.username, expiresAt: Number(row.expires_at) };
   }
 
   static changePassword(username, currentPassword, newPassword) {
@@ -43,14 +46,12 @@ class AdminAuthService {
     if (!user || !verifyPassword(currentPassword, user.password_hash)) throw new Error('当前密码错误');
     db.prepare('UPDATE admin_users SET password_hash = ?, updated_at = CURRENT_TIMESTAMP WHERE username = ?')
       .run(hashPassword(newPassword), username);
-    for (const [token, session] of sessions.entries()) {
-      if (session.username === username) sessions.delete(token);
-    }
+    db.prepare('DELETE FROM admin_sessions WHERE username = ?').run(username);
     return { success: true };
   }
 
   static logout(token) {
-    sessions.delete(token);
+    if (token) getDb().prepare('DELETE FROM admin_sessions WHERE token_hash = ?').run(tokenHash(token));
   }
 }
 
diff --git a/src/services/ContentService.js b/src/services/ContentService.js
index 377362f..f754091 100644
--- a/src/services/ContentService.js
+++ b/src/services/ContentService.js
@@ -175,10 +175,21 @@ class ContentService {
     }
     
     const Model = this.getModelByType(content.content_type);
-    const result = Model.delete(contentId);
-    // A deleted article published by the content system must be publishable again: forget its publication record.
-    getDb().prepare('DELETE FROM integration_publications WHERE content_id = ?').run(contentId);
-    return result;
+    // MySQL refuses to delete content that other rows still point at, so those go first: the content system's
+    // publication record (which also lets the content system publish the article again) and entity links.
+    // One transaction, so a failure leaves the article whole instead of half deleted.
+    const db = getDb();
+    db.prepare('START TRANSACTION').run();
+    try {
+      db.prepare('DELETE FROM integration_publications WHERE content_id = ?').run(contentId);
+      db.prepare('DELETE FROM entity_content_joins WHERE content_id = ?').run(contentId);
+      const result = Model.delete(contentId);
+      db.prepare('COMMIT').run();
+      return result;
+    } catch (error) {
+      db.prepare('ROLLBACK').run();
+      throw error;
+    }
   }
   
   // 内容状态流转
diff --git a/tests/adminFixes.unit.test.js b/tests/adminFixes.unit.test.js
new file mode 100644
index 0000000..0e2b72d
--- /dev/null
+++ b/tests/adminFixes.unit.test.js
@@ -0,0 +1,81 @@
+// Unit tests with the database replaced by a fake: the other suites in this folder write to the database in
+// .env, which is the production one, so these must never touch it.
+const statements = [];
+let rows = {};
+let failOn = null;
+
+const fakeDb = {
+  prepare(sql) {
+    return {
+      run: (...params) => {
+        statements.push(sql);
+        if (failOn && sql.startsWith(failOn)) throw new Error(`fake failure: ${failOn}`);
+        // Like MySQL's foreign keys: content still referenced by a publication cannot be deleted.
+        if (sql.startsWith('DELETE FROM contents') && rows.publication) throw new Error('ER_ROW_IS_REFERENCED_2');
+        if (sql.startsWith('DELETE FROM integration_publications')) rows.publication = null;
+        if (sql.startsWith('INSERT INTO admin_sessions')) rows.session = { token_hash: params[0], user_id: params[1], username: params[2], expires_at: params[3] };
+        if (sql.startsWith('DELETE FROM admin_sessions WHERE token_hash')) rows.session = null;
+        return { changes: 1 };
+      },
+      get: (...params) => {
+        statements.push(sql);
+        if (sql.includes('FROM contents')) return rows.content;
+        if (sql.includes('FROM admin_users')) return rows.user;
+        if (sql.includes('FROM admin_sessions')) return rows.session && rows.session.token_hash === params[0] ? rows.session : undefined;
+        return undefined;
+      },
+      all: () => [],
+    };
+  },
+};
+
+jest.mock('../src/config/database', () => ({ getDb: () => fakeDb, closeDb: () => {}, toMySqlParam: (v) => v }));
+
+const crypto = require('crypto');
+const ContentService = require('../src/services/ContentService');
+const AdminAuthService = require('../src/services/AdminAuthService');
+
+beforeEach(() => {
+  statements.length = 0;
+  failOn = null;
+  rows = { content: { content_id: 'c1', content_type: 'article' }, publication: { content_id: 'c1' } };
+});
+
+test('deleting a content-system article removes what points at it first, in one transaction', () => {
+  ContentService.delete('c1');
+  expect(statements.filter((sql) => !sql.startsWith('SELECT'))).toEqual([
+    'START TRANSACTION',
+    'DELETE FROM integration_publications WHERE content_id = ?',
+    'DELETE FROM entity_content_joins WHERE content_id = ?',
+    'DELETE FROM articles WHERE article_id = ?',
+    'DELETE FROM contents WHERE content_id = ?',
+    'COMMIT',
+  ]);
+});
+
+test('a failed delete is rolled back instead of leaving half an article', () => {
+  failOn = 'DELETE FROM contents';
+  expect(() => ContentService.delete('c1')).toThrow('fake failure');
+  expect(statements[statements.length - 1]).toBe('ROLLBACK');
+  expect(statements).not.toContain('COMMIT');
+});
+
+test('admin logins are kept in the database, so a restart does not log the admin out', () => {
+  const salt = 'ab'.repeat(16);
+  rows.user = { user_id: 'u1', username: 'admin', password_hash: `${salt}:${crypto.scryptSync('secret-pass', salt, 64).toString('hex')}` };
+  const { token } = AdminAuthService.login('admin', 'secret-pass');
+  expect(rows.session.token_hash).not.toBe(token);
+  jest.isolateModules(() => {
+    // A fresh copy of the service stands in for the restarted server.
+    const Restarted = require('../src/services/AdminAuthService');
+    expect(Restarted.verify(token)).toMatchObject({ username: 'admin' });
+    expect(Restarted.verify('wrong-token')).toBeNull();
+  });
+  AdminAuthService.logout(token);
+  expect(AdminAuthService.verify(token)).toBeNull();
+});
+
+test('an expired login is refused', () => {
+  rows.session = { token_hash: crypto.createHash('sha256').update('t').digest('hex'), user_id: 'u1', username: 'admin', expires_at: Date.now() - 1 };
+  expect(AdminAuthService.verify('t')).toBeNull();
+});