test(editor): cover focused-title guard and destroyed-editor early-out

Add coverage for the two untested branches in useGeneratePageTitle's
post-generation write: suppressing setContent when the live title editor
is focused (DB write + broadcast still happen, only the visible field
write is skipped), and the early return when the page editor is
destroyed (model never called).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -42,6 +42,7 @@ lerna-debug.log*
 .nx/installation
 .nx/cache
 .claude/worktrees/
+.claude/tmp/
 
 # TypeScript incremental build artifacts
 *.tsbuildinfo

AGENTS.md

@@ -283,37 +283,46 @@ Vite SPA. Code is organized by feature under `apps/client/src/features/*` (mirro
 
 ### Cutting a release
 
-The git tag is the source of truth for the displayed version (UI reads `git describe --tags`); the `package.json` bump is metadata only. Steps:
+The git tag is the source of truth for the displayed version (the client UI reads `git describe --tags` via `vite.config.ts`); the `package.json` bump is metadata that backs the server `/version` endpoint (`version.service.ts`).
 
-1. Make sure `main` is clean and pushed (`git status`, `git push`).
+**Golden rule — tag on `develop` first, merge to `main` afterwards.** Cut the version-bump commit on `develop`, put the tag on *that* commit, and push it. Merge `develop` into `main` later (it does not block the tag or the release). Because the tag is in `develop`'s ancestry from the moment it is created, `git describe` on `develop` — and the `ghcr.io/vvzvlad/gitmost:develop` image — reports the new version immediately, with **no back-merge dance**. Do **not** tag `main`'s merge commit; that is the mistake described in the pitfall below (we hit it twice).
+
+Steps:
+
+1. Make sure `develop` is up to date, clean, and pushed to **both** remotes (`git status`; `git push gitea develop && git push github develop`).
 2. Pick `vX.Y.Z` (SemVer): **minor** bump for a batch of features, **patch** for fixes only. Review what landed with `git log <last-tag>..HEAD --no-merges`.
-3. Bump `"version"` to `X.Y.Z` in the **root** `package.json`, `apps/client/package.json`, and `apps/server/package.json` (keep all three in sync). Leave `packages/mcp` alone — it is versioned independently. Commit with the bare version as the subject, e.g. `0.91.0` (matches past bump commits).
-4. Update `CHANGELOG.md` (Keep a Changelog format): add a `## [X.Y.Z] - YYYY-MM-DD` section summarising `git log vPREV..HEAD --no-merges` grouped by type (Breaking / Added / Changed / Fixed / Removed), and add the `compare/vPREV...vX.Y.Z` link at the bottom. Fold the bump + changelog into the release commit.
-5. Tag the release commit with a **lightweight** tag (existing release tags are lightweight): `git tag vX.Y.Z`.
-6. Push commit and tag: `git push origin main && git push origin vX.Y.Z`. Pushing the `v*` tag triggers `release.yml` (multi-arch GHCR images + a draft GitHub Release).
-7. **Back-merge the release into `develop`** so develop builds report the new version: `git checkout develop && git merge --no-ff main && git push origin develop` (push to Gitea as well if that is the canonical remote).
+3. Bump `"version"` to `X.Y.Z` in the **root** `package.json`, `apps/client/package.json`, and `apps/server/package.json` (keep all three in sync). Leave `packages/mcp` alone — it is versioned independently. Commit **on `develop`** with the bare version as the subject, e.g. `0.94.1` (matches past bump commits).
+4. For a real release (skip for a bare hotfix tag), update `CHANGELOG.md` (Keep a Changelog format): add a `## [X.Y.Z] - YYYY-MM-DD` section summarising `git log vPREV..HEAD --no-merges` grouped by type (Breaking / Added / Changed / Fixed / Removed), and the `compare/vPREV...vX.Y.Z` link at the bottom. Fold it into the bump commit.
+5. Tag that develop commit with a **lightweight** tag (existing release tags are lightweight): `git tag vX.Y.Z`.
+6. Push the branch **and** the tag to **both** writable remotes — `git push <branch>` does **not** push tags, and tags are per-remote:
+   ```bash
+   git push gitea develop && git push gitea vX.Y.Z
+   git push github develop && git push github vX.Y.Z
+   ```
+   Pushing the `v*` tag to `github` triggers `release.yml` (multi-arch GHCR images + a draft GitHub Release). The tag *must* exist on `github`, because the `:develop` and release images are built there by GitHub Actions and `git describe` on the runner only sees the tags present on `github` (not your local clone or `gitea`).
+7. Merge `develop` into `main` when ready (commonly later — this does not gate the release):
+   ```bash
+   git checkout main
+   git merge --ff-only develop   # or a merge commit if fast-forward is not possible
+   git push gitea main && git push github main
+   ```
+   The tag is already reachable from `main` (it lives in the `develop` history that `main` now contains), so `main` reports `vX.Y.Z` too — no extra tagging needed.
 
-#### Why develop keeps showing the *previous* version (and why step 7 matters)
+#### Pitfall: tagging `main` instead of `develop` (the mistake to avoid)
 
-The UI version is `git describe --tags --always` (see `vite.config.ts`), which walks **backwards from the current commit** and picks the **nearest tag reachable in that commit's ancestry**, then appends `-<commits-since-tag>-g<short-hash>`.
+`git describe --tags --always` (see `vite.config.ts`) walks **backwards from the current commit** and picks the **nearest tag reachable in that commit's ancestry**, then appends `-<commits-since-tag>-g<short-hash>`.
 
-The release tag (`vX.Y.Z`) is created on **`main`'s release merge commit**, and that commit is **not** in `develop`'s history. So until the release is back-merged, `git describe` on `develop` cannot see the new tag and falls back to the *previous* reachable tag. Result: every develop build — and the `ghcr.io/vvzvlad/gitmost:develop` image — keeps reporting e.g. `v0.91.0-NNN-g<hash>` even though `main` is already tagged `v0.93.0`. This is the classic git-flow pitfall: the version on `develop` does **not** advance just because a release was tagged on `main`.
+The wrong flow we fell into twice: merge `develop` into `main` *first*, then tag `main`'s **release merge commit**. That merge commit is **not** in `develop`'s history, so `git describe` on `develop` cannot see the new tag and falls back to the *previous* reachable one. Result: every develop build — and the `ghcr.io/vvzvlad/gitmost:develop` image — keeps reporting e.g. `v0.93.0-NNN-g<hash>` even though a release was "cut". Tagging on `develop` (the golden rule above) avoids this entirely: the tag is in `develop`'s ancestry from the start, and `main` still gets it once `develop` is merged in.
 
-Back-merging `main → develop` (step 7) pulls the tagged release commit into `develop`'s ancestry, after which develop builds correctly show `vX.Y.Z-NNN-g<hash>`. If `develop` already drifted (release tagged but never back-merged), just run step 7 now — no new tag is needed.
+Second gotcha — the tag must exist on the remote CI builds from. `git describe` names a tag **ref**, not just a commit. The `:develop` and release images are built by GitHub Actions (`develop.yml` / `release.yml`, `actions/checkout` with `fetch-depth: 0`), so the version they print depends on which tags exist **on the `github` remote** — not on your local clone or on `gitea`. `git push <branch>` does **not** push tags; push them explicitly to **each** remote (`gitea` and `github`). A tag that only lives on `gitea` is invisible to the GitHub build.
 
-##### The tag must also exist on the remote that CI builds from (multi-remote gotcha)
+If you already tagged `main` (or `develop` still shows the old version), recover without re-tagging:
 
-`git describe` names a tag **ref**, not just a commit — so the back-merge is *necessary but not sufficient*. The develop image is built by GitHub Actions (`develop.yml`, `actions/checkout` with `fetch-depth: 0`, then `git describe --tags --always`), so the version it prints depends on which tags exist **on the `github` remote**, not on your local clone or on `gitea`.
+1. Make the tagged commit reachable from `develop` — either back-merge `main → develop` (`git checkout develop && git merge --no-ff main`), or confirm the tagged commit is already an ancestor of `develop`.
+2. Make sure the tag exists on `github`: compare `git ls-remote --tags github` with `gitea`, and push the missing one (`git push github vX.Y.Z` / `git push gitea vX.Y.Z`). Pushing a `v*` tag to `github` also fires `release.yml` — expected, just be aware.
+3. Re-run the develop build (`gh workflow run Develop`, or push any commit to `develop`) so `git describe` re-resolves with the tag now in scope.
 
-This repo has two writable remotes — `gitea` (canonical, where commits land) and `github` (where the `:develop` and release images are built) — plus `upstream` (docmost, never push). **`git push <branch>` does NOT push tags**; tags must be pushed explicitly and *to each remote separately*. A release tag that only lives on `gitea` is invisible to the GitHub Actions build: even with the tagged commit fully in `develop`'s history (step 7 done), `git describe` on the GitHub runner falls back to the previous tag it *does* have, so the develop image keeps showing e.g. `v0.91.0-NNN` while `git describe` locally already says `v0.93.0-NN`.
-
-Fix / checklist when develop still shows the old version after a back-merge:
-
-1. Confirm the tag is missing on github: `git ls-remote --tags github` (compare with `gitea`).
-2. Push it there: `git push github vX.Y.Z` (and `git push gitea vX.Y.Z` if it is missing on gitea too). Note: pushing a `v*` tag to `github` also triggers `release.yml` (multi-arch GHCR images + draft Release) — expected, but be aware.
-3. Re-run the develop build (`gh workflow run Develop`, or push any commit to `develop`) so `git describe` re-resolves with the tag now present.
-
-(The `git push origin ...` in steps 6–7 above is shorthand — there is no `origin` remote here; substitute `gitea` **and** `github` as appropriate, and always push release tags to both.)
+(There is no `origin` remote here — push to `gitea` **and** `github` explicitly, and always push release tags to both.)
 
 ## Planning docs
 

CHANGELOG.md

@@ -22,6 +22,16 @@ per-workspace rolling-day token budget.
 
 ### Added
 
+- **Custom pretty-links for shared pages (`/l/:alias`).** A page editor can give
+  any publicly shared page a short, memorable, workspace-scoped vanity address
+  backed by a new `share_aliases` table. Hitting `/l/<alias>` issues a `302`
+  (never `301`, since the target is retargetable) to the canonical
+  `/share/<key>/p/<slug>` page; an unknown, dangling, or no-longer-readable alias
+  serves the plain SPA index so that the existence of a name never leaks. An
+  alias can be moved to another page (with a confirm-reassign guard) and the
+  foreign key is `ON DELETE SET NULL`, so deleting the target leaves a dangling
+  alias any workspace member can reclaim. (#205)
+
 - **Persistent AI-chat history as the source of truth + server-side export.**
   An assistant turn is now persisted to the database step by step: the row is
   inserted upfront as `streaming` and updated as each agent step finishes, then
@@ -62,6 +72,12 @@ per-workspace rolling-day token budget.
 - **Footnote multi-backlinks.** A footnote referenced more than once now shows a
   back-link per reference (↩ a b c …), each scrolling to its own occurrence, like
   Pandoc/Wikipedia; a single-reference footnote keeps the plain ↩. (#168)
+- **Generate a page title from its content.** A "sparkles" button in the page
+  byline reads the live editor content (including unsaved edits), generates a
+  title via the workspace AI provider (`POST /ai-chat/generate-page-title`), and
+  applies it through the existing `/pages/update` route — reflecting it in the
+  title field and broadcasting to other clients. Gated by the `settings.ai.generative`
+  flag and throttled per user. (#199)
 
 ### Changed
 

apps/client/public/locales/en-US/translation.json

@@ -1318,5 +1318,23 @@
   "Protocol": "Protocol",
   "How chat requests are sent and how reasoning is surfaced": "How chat requests are sent and how reasoning is surfaced",
   "OpenAI-compatible (surfaces reasoning)": "OpenAI-compatible (surfaces reasoning)",
-  "OpenAI (official)": "OpenAI (official)"
+  "OpenAI (official)": "OpenAI (official)",
+  "Custom address": "Custom address",
+  "A short, memorable link you can point at any shared page.": "A short, memorable link you can point at any shared page.",
+  "Use 2-60 lowercase letters, digits and hyphens": "Use 2-60 lowercase letters, digits and hyphens",
+  "This address is already in use": "This address is already in use",
+  "Move custom address?": "Move custom address?",
+  "Move here": "Move here",
+  "The address \"{{alias}}\" currently points to \"{{title}}\". Move it to this page?": "The address \"{{alias}}\" currently points to \"{{title}}\". Move it to this page?",
+  "The address \"{{alias}}\" is already in use. Move it to this page?": "The address \"{{alias}}\" is already in use. Move it to this page?",
+  "Failed to set custom address": "Failed to set custom address",
+  "Failed to remove custom address": "Failed to remove custom address",
+  "Generate title with AI": "Generate title with AI",
+  "Title generated": "Title generated",
+  "Failed to generate title": "Failed to generate title",
+  "The note is empty": "The note is empty",
+  "Could not generate a title": "Could not generate a title",
+  "AI title generation is disabled": "AI title generation is disabled",
+  "AI is not configured": "AI is not configured",
+  "Too many requests, please try again later": "Too many requests, please try again later"
 }

apps/client/public/locales/ru-RU/translation.json

@@ -1175,5 +1175,23 @@
   "Protocol": "Протокол",
   "How chat requests are sent and how reasoning is surfaced": "Как отправляются запросы чата и как показывается reasoning",
   "OpenAI-compatible (surfaces reasoning)": "OpenAI-совместимый (показывает reasoning)",
-  "OpenAI (official)": "OpenAI (официальный)"
+  "OpenAI (official)": "OpenAI (официальный)",
+  "Custom address": "Пользовательский адрес",
+  "A short, memorable link you can point at any shared page.": "Короткая запоминающаяся ссылка, которую можно направить на любую опубликованную страницу.",
+  "Use 2-60 lowercase letters, digits and hyphens": "Используйте 2–60 строчных букв, цифр и дефисов",
+  "This address is already in use": "Этот адрес уже занят",
+  "Move custom address?": "Переместить пользовательский адрес?",
+  "Move here": "Переместить сюда",
+  "The address \"{{alias}}\" currently points to \"{{title}}\". Move it to this page?": "Адрес «{{alias}}» сейчас указывает на «{{title}}». Переместить его на эту страницу?",
+  "The address \"{{alias}}\" is already in use. Move it to this page?": "Адрес «{{alias}}» уже используется. Переместить его на эту страницу?",
+  "Failed to set custom address": "Не удалось задать пользовательский адрес",
+  "Failed to remove custom address": "Не удалось удалить пользовательский адрес",
+  "Generate title with AI": "Сгенерировать название через AI",
+  "Title generated": "Название сгенерировано",
+  "Failed to generate title": "Не удалось сгенерировать название",
+  "The note is empty": "Заметка пустая",
+  "Could not generate a title": "Не удалось придумать название",
+  "AI title generation is disabled": "Генерация названий через AI отключена",
+  "AI is not configured": "AI не настроен",
+  "Too many requests, please try again later": "Слишком много запросов, попробуйте позже"
 }

apps/client/src/features/ai-chat/services/ai-chat-service.ts

@@ -68,6 +68,19 @@ export async function exportAiChat(
   return req.data.markdown;
 }
 
+/**
+ * Generate a page title from note content (markdown). One-shot, non-streaming
+ * (#199): the server only summarizes the supplied text and returns a suggestion;
+ * it never writes the page. The caller applies the title via /pages/update.
+ */
+export async function generatePageTitle(content: string): Promise<string> {
+  const req = await api.post<{ title: string }>(
+    "/ai-chat/generate-page-title",
+    { content },
+  );
+  return req.data.title;
+}
+
 /**
  * Agent roles API (`/ai-chat/roles`). `list` is available to any workspace
  * member (for the chat-creation picker); create/update/delete are admin-only

apps/client/src/features/editor/components/fixed-toolbar/groups/generate-title-group.tsx

@@ -0,0 +1,39 @@
+import { FC } from "react";
+import { ActionIcon, Tooltip } from "@mantine/core";
+import { IconSparkles } from "@tabler/icons-react";
+import { useTranslation } from "react-i18next";
+import { useGeneratePageTitle } from "@/features/editor/hooks/use-generate-page-title.ts";
+
+interface Props {
+  pageId: string;
+  color?: string;
+  iconSize?: number;
+}
+
+/**
+ * AI "generate title" button (#199). Reads the live editor content and applies a
+ * model-suggested title immediately. Rendered in the page byline, only in edit
+ * mode and when the workspace's generative AI flag is on.
+ */
+export const GenerateTitleGroup: FC<Props> = ({
+  pageId,
+  color = "gray",
+  iconSize = 20,
+}) => {
+  const { t } = useTranslation();
+  const gen = useGeneratePageTitle(pageId);
+
+  return (
+    <Tooltip label={t("Generate title with AI")} withArrow openDelay={250}>
+      <ActionIcon
+        variant="subtle"
+        color={color}
+        aria-label={t("Generate title with AI")}
+        loading={gen.isPending}
+        onClick={() => gen.mutate()}
+      >
+        <IconSparkles size={iconSize} stroke={1.5} />
+      </ActionIcon>
+    </Tooltip>
+  );
+};

apps/client/src/features/editor/full-editor.tsx

@@ -32,6 +32,7 @@ import {
   pageEditorAtom,
 } from "@/features/editor/atoms/editor-atoms.ts";
 import { DictationGroup } from "@/features/editor/components/fixed-toolbar/groups/dictation-group";
+import { GenerateTitleGroup } from "@/features/editor/components/fixed-toolbar/groups/generate-title-group";
 
 const MemoizedTitleEditor = React.memo(TitleEditor);
 const MemoizedPageEditor = React.memo(PageEditor);
@@ -74,6 +75,9 @@ export function FullEditor({
   const [user] = useAtom(userAtom);
   const workspace = useAtomValue(workspaceAtom);
   const isDictationEnabled = workspace?.settings?.ai?.dictation === true;
+  // AI title generation reuses the generative AI flag (same gate as the on-page
+  // generative menu); the server enforces it too (#199).
+  const isTitleGenEnabled = workspace?.settings?.ai?.generative === true;
   const fullPageWidth = user.settings?.preferences?.fullPageWidth;
   const editorToolbarEnabled =
     user.settings?.preferences?.editorToolbar ?? false;
@@ -111,11 +115,13 @@ export function FullEditor({
         editable={editable}
       />
       <PageByline
+        pageId={pageId}
         creator={creator}
         contributors={contributors}
         editable={editable}
         isEditMode={isEditMode}
         isDictationEnabled={isDictationEnabled}
+        isTitleGenEnabled={isTitleGenEnabled}
       />
       <MemoizedPageEditor
         pageId={pageId}
@@ -128,19 +134,23 @@ export function FullEditor({
 }
 
 type PageBylineProps = {
+  pageId: string;
   creator?: PageUser;
   contributors?: IContributor[];
   editable?: boolean;
   isEditMode?: boolean;
   isDictationEnabled?: boolean;
+  isTitleGenEnabled?: boolean;
 };
 
 function PageByline({
+  pageId,
   creator,
   contributors,
   editable,
   isEditMode,
   isDictationEnabled,
+  isTitleGenEnabled,
 }: PageBylineProps) {
   const { t } = useTranslation();
   const detailsTriggerProps = useAsideTriggerProps("details");
@@ -148,6 +158,9 @@ function PageByline({
   const showDictation = Boolean(
     isDictationEnabled && editable && isEditMode && editor,
   );
+  const showTitleGen = Boolean(
+    isTitleGenEnabled && editable && isEditMode && editor,
+  );
 
   const otherContributors = (contributors ?? []).filter(
     (c) => c.id !== creator?.id,
@@ -238,6 +251,11 @@ function PageByline({
         {showDictation && editor && (
           <DictationGroup editor={editor} color="gray" iconSize={20} />
         )}
+        {/* Shown only in edit mode when the workspace's generative AI flag is on,
+            so AI title generation stays reachable from the byline (#199). */}
+        {showTitleGen && (
+          <GenerateTitleGroup pageId={pageId} color="gray" iconSize={20} />
+        )}
       </Group>
     </Group>
   );

apps/client/src/features/editor/hooks/use-generate-page-title.test.tsx

@@ -0,0 +1,294 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { renderHook, act } from "@testing-library/react";
+import type { ReactNode } from "react";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { Provider, createStore } from "jotai";
+import type { Editor } from "@tiptap/core";
+import {
+  pageEditorAtom,
+  titleEditorAtom,
+} from "@/features/editor/atoms/editor-atoms.ts";
+
+// --- Mocks for the hook's collaborators ---------------------------------------
+
+const generatePageTitleMock = vi.fn();
+vi.mock("@/features/ai-chat/services/ai-chat-service.ts", () => ({
+  generatePageTitle: (content: string) => generatePageTitleMock(content),
+}));
+
+const updateTitleMock = vi.fn();
+const updatePageDataMock = vi.fn();
+vi.mock("@/features/page/queries/page-query.ts", () => ({
+  useUpdateTitlePageMutation: () => ({ mutateAsync: updateTitleMock }),
+  updatePageData: (page: unknown) => updatePageDataMock(page),
+}));
+
+const emitMock = vi.fn();
+vi.mock("@/features/websocket/use-query-emit.ts", () => ({
+  useQueryEmit: () => emitMock,
+}));
+
+const localEmitMock = vi.fn();
+vi.mock("@/lib/local-emitter.ts", () => ({
+  default: { emit: (...args: unknown[]) => localEmitMock(...args) },
+}));
+
+// htmlToMarkdown just echoes the editor HTML so each test controls the markdown
+// purely via the fake page editor's getHTML().
+vi.mock("@docmost/editor-ext", () => ({
+  htmlToMarkdown: (html: string) => html,
+}));
+
+const notificationsShowMock = vi.fn();
+vi.mock("@mantine/notifications", () => ({
+  notifications: { show: (opts: unknown) => notificationsShowMock(opts) },
+}));
+
+vi.mock("react-i18next", () => ({
+  useTranslation: () => ({ t: (key: string) => key }),
+}));
+
+// Import after mocks are registered.
+import { useGeneratePageTitle } from "./use-generate-page-title.ts";
+
+// --- Test helpers -------------------------------------------------------------
+
+function makePageEditor(pageId: string, html = "<p>content</p>"): Editor {
+  return {
+    isDestroyed: false,
+    getHTML: () => html,
+    storage: { pageId },
+  } as unknown as Editor;
+}
+
+function makeTitleEditor(): Editor & {
+  commands: { setContent: ReturnType<typeof vi.fn> };
+} {
+  return {
+    isDestroyed: false,
+    isFocused: false,
+    commands: { setContent: vi.fn() },
+  } as unknown as Editor & {
+    commands: { setContent: ReturnType<typeof vi.fn> };
+  };
+}
+
+function setup(pageId: string, store = createStore()) {
+  const queryClient = new QueryClient({
+    defaultOptions: { mutations: { retry: false } },
+  });
+  const wrapper = ({ children }: { children: ReactNode }) => (
+    <QueryClientProvider client={queryClient}>
+      <Provider store={store}>{children}</Provider>
+    </QueryClientProvider>
+  );
+  const { result } = renderHook(() => useGeneratePageTitle(pageId), {
+    wrapper,
+  });
+  return { result, store };
+}
+
+const PAGE_A = {
+  id: "pageA",
+  title: "Generated Title",
+  spaceId: "space1",
+  slugId: "slugA",
+  parentPageId: null,
+  icon: null,
+} as any;
+
+beforeEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("useGeneratePageTitle", () => {
+  it("shows a notice and bails when the editor content is empty", async () => {
+    const store = createStore();
+    store.set(pageEditorAtom as never, makePageEditor("pageA", "   "));
+    store.set(titleEditorAtom as never, makeTitleEditor());
+    const { result } = setup("pageA", store);
+
+    await act(async () => {
+      await result.current.mutateAsync();
+    });
+
+    expect(notificationsShowMock).toHaveBeenCalledWith(
+      expect.objectContaining({ message: "The note is empty", color: "yellow" }),
+    );
+    expect(generatePageTitleMock).not.toHaveBeenCalled();
+    expect(updateTitleMock).not.toHaveBeenCalled();
+  });
+
+  it("leaves the title untouched when the model returns nothing usable", async () => {
+    const store = createStore();
+    store.set(pageEditorAtom as never, makePageEditor("pageA"));
+    store.set(titleEditorAtom as never, makeTitleEditor());
+    generatePageTitleMock.mockResolvedValue("   ");
+    const { result } = setup("pageA", store);
+
+    await act(async () => {
+      await result.current.mutateAsync();
+    });
+
+    expect(updateTitleMock).not.toHaveBeenCalled();
+    expect(notificationsShowMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        message: "Could not generate a title",
+        color: "yellow",
+      }),
+    );
+  });
+
+  it("happy path: applies the title, refreshes cache, writes the field, broadcasts", async () => {
+    const store = createStore();
+    const titleEditor = makeTitleEditor();
+    store.set(pageEditorAtom as never, makePageEditor("pageA"));
+    store.set(titleEditorAtom as never, titleEditor);
+    generatePageTitleMock.mockResolvedValue("Generated Title");
+    updateTitleMock.mockResolvedValue(PAGE_A);
+    const { result } = setup("pageA", store);
+
+    await act(async () => {
+      await result.current.mutateAsync();
+    });
+
+    expect(updateTitleMock).toHaveBeenCalledWith({
+      pageId: "pageA",
+      title: "Generated Title",
+    });
+    expect(updatePageDataMock).toHaveBeenCalledWith(PAGE_A);
+    expect(titleEditor.commands.setContent).toHaveBeenCalledWith(
+      "Generated Title",
+    );
+    expect(localEmitMock).toHaveBeenCalled();
+    expect(emitMock).toHaveBeenCalled();
+    expect(notificationsShowMock).toHaveBeenCalledWith(
+      expect.objectContaining({ message: "Title generated" }),
+    );
+  });
+
+  it("does NOT write the visible title field when the user navigated away during generation", async () => {
+    const store = createStore();
+    const titleEditor = makeTitleEditor(); // persistent across navigation
+    store.set(pageEditorAtom as never, makePageEditor("pageA"));
+    store.set(titleEditorAtom as never, titleEditor);
+
+    // Control when generation resolves so we can navigate mid-flight.
+    let resolveTitle!: (t: string) => void;
+    generatePageTitleMock.mockReturnValue(
+      new Promise<string>((res) => {
+        resolveTitle = res;
+      }),
+    );
+    updateTitleMock.mockResolvedValue(PAGE_A);
+    const { result } = setup("pageA", store);
+
+    let pending!: Promise<void>;
+    act(() => {
+      pending = result.current.mutateAsync();
+    });
+
+    // User navigates to page B: the live page editor now belongs to pageB.
+    act(() => {
+      store.set(pageEditorAtom as never, makePageEditor("pageB"));
+    });
+
+    await act(async () => {
+      resolveTitle("Generated Title");
+      await pending;
+    });
+
+    // DB write is still correct (keyed by the captured pageId)...
+    expect(updateTitleMock).toHaveBeenCalledWith({
+      pageId: "pageA",
+      title: "Generated Title",
+    });
+    // ...but we must NOT stamp page A's title into page B's visible field.
+    expect(titleEditor.commands.setContent).not.toHaveBeenCalled();
+    // The change is still broadcast to other clients.
+    expect(emitMock).toHaveBeenCalled();
+  });
+
+  it("does NOT write the visible title field when the title editor is focused", async () => {
+    const store = createStore();
+    const titleEditor = makeTitleEditor();
+    store.set(pageEditorAtom as never, makePageEditor("pageA"));
+    store.set(titleEditorAtom as never, titleEditor);
+
+    // Resolve generation under our control so we can mark the live title editor
+    // as focused before the post-generation write runs.
+    let resolveTitle!: (t: string) => void;
+    generatePageTitleMock.mockReturnValue(
+      new Promise<string>((res) => {
+        resolveTitle = res;
+      }),
+    );
+    updateTitleMock.mockResolvedValue(PAGE_A);
+    const { result } = setup("pageA", store);
+
+    let pending!: Promise<void>;
+    act(() => {
+      pending = result.current.mutateAsync();
+    });
+
+    // The user clicked into the title field while the model ran — overwriting it
+    // now would clobber what they are actively typing.
+    act(() => {
+      (titleEditor as { isFocused: boolean }).isFocused = true;
+    });
+
+    await act(async () => {
+      resolveTitle("Generated Title");
+      await pending;
+    });
+
+    // The DB write still persists the value...
+    expect(updateTitleMock).toHaveBeenCalledWith({
+      pageId: "pageA",
+      title: "Generated Title",
+    });
+    expect(updatePageDataMock).toHaveBeenCalledWith(PAGE_A);
+    // ...but the visible field is left alone while it is focused.
+    expect(titleEditor.commands.setContent).not.toHaveBeenCalled();
+    // The change is still broadcast to other clients.
+    expect(localEmitMock).toHaveBeenCalled();
+    expect(emitMock).toHaveBeenCalled();
+  });
+
+  it("bails before calling the model when the page editor is destroyed", async () => {
+    const store = createStore();
+    const pageEditor = makePageEditor("pageA");
+    (pageEditor as { isDestroyed: boolean }).isDestroyed = true;
+    store.set(pageEditorAtom as never, pageEditor);
+    store.set(titleEditorAtom as never, makeTitleEditor());
+    const { result } = setup("pageA", store);
+
+    await act(async () => {
+      await result.current.mutateAsync();
+    });
+
+    expect(generatePageTitleMock).not.toHaveBeenCalled();
+    expect(updateTitleMock).not.toHaveBeenCalled();
+  });
+
+  it.each([
+    [403, "AI title generation is disabled"],
+    [503, "AI is not configured"],
+    [429, "Too many requests, please try again later"],
+    [500, "Failed to generate title"],
+  ])("maps HTTP %s onError to a friendly message", async (status, message) => {
+    const store = createStore();
+    store.set(pageEditorAtom as never, makePageEditor("pageA"));
+    store.set(titleEditorAtom as never, makeTitleEditor());
+    generatePageTitleMock.mockRejectedValue({ response: { status } });
+    const { result } = setup("pageA", store);
+
+    await act(async () => {
+      await expect(result.current.mutateAsync()).rejects.toBeTruthy();
+    });
+
+    expect(notificationsShowMock).toHaveBeenCalledWith(
+      expect.objectContaining({ message, color: "red" }),
+    );
+  });
+});

apps/client/src/features/editor/hooks/use-generate-page-title.ts

@@ -0,0 +1,134 @@
+import { useRef } from "react";
+import { useMutation } from "@tanstack/react-query";
+import { useAtomValue } from "jotai";
+import { notifications } from "@mantine/notifications";
+import { useTranslation } from "react-i18next";
+import { htmlToMarkdown } from "@docmost/editor-ext";
+import {
+  pageEditorAtom,
+  titleEditorAtom,
+} from "@/features/editor/atoms/editor-atoms.ts";
+import {
+  updatePageData,
+  useUpdateTitlePageMutation,
+} from "@/features/page/queries/page-query.ts";
+import { generatePageTitle } from "@/features/ai-chat/services/ai-chat-service.ts";
+import { useQueryEmit } from "@/features/websocket/use-query-emit.ts";
+import { UpdateEvent } from "@/features/websocket/types";
+import localEmitter from "@/lib/local-emitter.ts";
+
+// Maximum length we send to the model. The server truncates again; this is a
+// cheap client-side bound so we never ship a huge body over the wire.
+const MAX_CONTENT_CHARS = 20000;
+
+/**
+ * Generate a title for the given page from the LIVE editor content (#199),
+ * including unsaved edits, then apply it IMMEDIATELY (per product decision). The
+ * server endpoint only summarizes the supplied markdown — it never writes the
+ * page; the actual title write goes through the existing /pages/update mutation
+ * (which enforces edit permission), and is mirrored to the title field + other
+ * clients exactly like TitleEditor.saveTitle. Returns a mutation-like API so the
+ * button can show a loading state via `isPending`.
+ */
+export function useGeneratePageTitle(pageId: string) {
+  const { t } = useTranslation();
+  const pageEditor = useAtomValue(pageEditorAtom);
+  const titleEditor = useAtomValue(titleEditorAtom);
+  const { mutateAsync: updateTitle } = useUpdateTitlePageMutation();
+  const emit = useQueryEmit();
+
+  // The page/title editors come from GLOBAL atoms that re-point when the user
+  // navigates to another page. The mutation below awaits the model for 1-3s, and
+  // its closure captures the editors from the render that started it. Keep a live
+  // reference so the post-generation write targets whatever page is on screen
+  // *now*, not the page the generation was started from.
+  const editorsRef = useRef({ pageEditor, titleEditor });
+  editorsRef.current = { pageEditor, titleEditor };
+
+  return useMutation<void, Error, void>({
+    mutationFn: async () => {
+      if (!pageEditor || pageEditor.isDestroyed) return;
+
+      const markdown = htmlToMarkdown(pageEditor.getHTML()).trim();
+      if (!markdown) {
+        notifications.show({ message: t("The note is empty"), color: "yellow" });
+        return;
+      }
+
+      const title = (
+        await generatePageTitle(markdown.slice(0, MAX_CONTENT_CHARS))
+      ).trim();
+      if (!title) {
+        // The model returned nothing usable — keep the existing title untouched.
+        notifications.show({
+          message: t("Could not generate a title"),
+          color: "yellow",
+        });
+        return;
+      }
+
+      const page = await updateTitle({ pageId, title }); // POST /pages/update
+      updatePageData(page); // refresh the react-query cache
+
+      // Reflect the new title in the field immediately. The button lives in the
+      // byline, so the title editor is not focused — setContent is safe and stays
+      // undoable through its History extension (Ctrl/Cmd+Z reverts the change).
+      //
+      // Guard against navigation during generation: if the user switched pages
+      // while the model ran, the (persistent) title editor now shows ANOTHER
+      // page, so writing here would drop page A's title into page B's visible
+      // field. page-editor.tsx stamps the live page editor with its pageId
+      // (`editor.storage.pageId`), mirroring TitleEditor's `activePageId !==
+      // pageId` guard — bail the visible write unless that live editor still
+      // belongs to the page this title was generated for. The DB write above is
+      // already correct (keyed by the captured `pageId`), and the broadcast below
+      // still propagates page A's change to other clients.
+      const livePageEditor = editorsRef.current.pageEditor;
+      const liveTitleEditor = editorsRef.current.titleEditor;
+      // `storage.pageId` is stamped untyped in page-editor.tsx's onCreate.
+      const livePageId = (livePageEditor?.storage as { pageId?: string })
+        ?.pageId;
+      const stillOnPage = livePageId === pageId;
+      if (
+        stillOnPage &&
+        liveTitleEditor &&
+        !liveTitleEditor.isDestroyed &&
+        !liveTitleEditor.isFocused
+      ) {
+        liveTitleEditor.commands.setContent(page.title);
+      }
+
+      // Broadcast to other clients, mirroring TitleEditor.saveTitle's event shape.
+      const event: UpdateEvent = {
+        operation: "updateOne",
+        spaceId: page.spaceId,
+        entity: ["pages"],
+        id: page.id,
+        payload: {
+          title: page.title,
+          slugId: page.slugId,
+          parentPageId: page.parentPageId,
+          icon: page.icon,
+        },
+      };
+      localEmitter.emit("message", event);
+      emit(event);
+
+      notifications.show({ message: t("Title generated") });
+    },
+    onError: (err) => {
+      // Map known HTTP statuses to friendly messages, falling back to generic.
+      const status = (err as { response?: { status?: number } })?.response
+        ?.status;
+      const message =
+        status === 403
+          ? t("AI title generation is disabled")
+          : status === 503
+            ? t("AI is not configured")
+            : status === 429
+              ? t("Too many requests, please try again later")
+              : t("Failed to generate title");
+      notifications.show({ message, color: "red" });
+    },
+  });
+}

apps/client/src/features/share/components/share-alias-section.tsx

@@ -0,0 +1,237 @@
+import {
+  ActionIcon,
+  Button,
+  Group,
+  Modal,
+  Text,
+  TextInput,
+} from "@mantine/core";
+import { IconExternalLink } from "@tabler/icons-react";
+import { useEffect, useMemo, useRef, useState } from "react";
+import { useTranslation } from "react-i18next";
+import CopyTextButton from "@/components/common/copy.tsx";
+import { getAppUrl } from "@/lib/config.ts";
+import {
+  useRemoveShareAliasMutation,
+  useSetShareAliasMutation,
+  useShareAliasForPageQuery,
+} from "@/features/share/queries/share-query.ts";
+import { checkShareAliasAvailability } from "@/features/share/services/share-service.ts";
+import {
+  isValidShareAlias,
+  normalizeShareAlias,
+} from "@/features/share/share-alias.util.ts";
+
+interface ShareAliasSectionProps {
+  pageId: string;
+  readOnly: boolean;
+}
+
+// The prefix label shown next to the slug input, e.g. "docs.example.com/l/".
+function aliasPrefixLabel(): string {
+  const url = getAppUrl();
+  const host = url.replace(/^https?:\/\//, "").replace(/\/+$/, "");
+  return `${host}/l/`;
+}
+
+export default function ShareAliasSection({
+  pageId,
+  readOnly,
+}: ShareAliasSectionProps) {
+  const { t } = useTranslation();
+  const { data: currentAlias } = useShareAliasForPageQuery(pageId);
+  const setAliasMutation = useSetShareAliasMutation();
+  const removeAliasMutation = useRemoveShareAliasMutation();
+
+  const [value, setValue] = useState("");
+  const [availability, setAvailability] = useState<{
+    valid: boolean;
+    available: boolean;
+    currentPageId: string | null;
+  } | null>(null);
+  const [reassign, setReassign] = useState<{
+    alias: string;
+    currentPageTitle: string | null;
+  } | null>(null);
+
+  // Seed the input from the page's current alias (if any).
+  useEffect(() => {
+    setValue(currentAlias?.alias ?? "");
+  }, [currentAlias?.alias, pageId]);
+
+  const normalized = useMemo(() => normalizeShareAlias(value), [value]);
+  const isValid = isValidShareAlias(normalized);
+  const unchanged = currentAlias?.alias === normalized;
+
+  // Debounced availability probe (skips when invalid or unchanged).
+  const debounceRef = useRef<ReturnType<typeof setTimeout>>();
+  useEffect(() => {
+    setAvailability(null);
+    if (!isValid || unchanged) return;
+    debounceRef.current && clearTimeout(debounceRef.current);
+    debounceRef.current = setTimeout(async () => {
+      try {
+        const res = await checkShareAliasAvailability(normalized);
+        setAvailability({
+          valid: res.valid,
+          available: res.available,
+          currentPageId: res.currentPageId,
+        });
+      } catch {
+        setAvailability(null);
+      }
+    }, 400);
+    return () => {
+      debounceRef.current && clearTimeout(debounceRef.current);
+    };
+  }, [normalized, isValid, unchanged]);
+
+  const prettyLink = currentAlias?.alias
+    ? `${getAppUrl()}/l/${currentAlias.alias}`
+    : null;
+
+  const handleSave = async (confirmReassign = false) => {
+    try {
+      await setAliasMutation.mutateAsync({
+        pageId,
+        alias: normalized,
+        confirmReassign,
+      });
+      setReassign(null);
+    } catch (error: any) {
+      // The address already points at another page: prompt to move it here.
+      if (error?.status === 409 || error?.response?.status === 409) {
+        const data = error?.response?.data;
+        if (data?.code === "ALIAS_REASSIGN_REQUIRED") {
+          setReassign({
+            alias: normalized,
+            currentPageTitle: data?.currentPageTitle ?? null,
+          });
+        }
+      }
+    }
+  };
+
+  const handleRemove = async () => {
+    if (!currentAlias?.id) return;
+    await removeAliasMutation.mutateAsync(currentAlias.id);
+    setValue("");
+  };
+
+  const showInvalid = normalized.length > 0 && !isValid;
+  const showTaken =
+    isValid && !unchanged && availability && !availability.available;
+
+  return (
+    <>
+      <Text size="sm" fw={500} mt="md">
+        {t("Custom address")}
+      </Text>
+      <Text size="xs" c="dimmed" mb={4}>
+        {t("A short, memorable link you can point at any shared page.")}
+      </Text>
+
+      {prettyLink && (
+        <Group my="xs" gap={4} wrap="nowrap">
+          <TextInput
+            variant="filled"
+            value={prettyLink}
+            readOnly
+            rightSection={<CopyTextButton text={prettyLink} />}
+            style={{ width: "100%" }}
+          />
+          <ActionIcon
+            component="a"
+            variant="default"
+            target="_blank"
+            href={prettyLink}
+            size="sm"
+          >
+            <IconExternalLink size={16} />
+          </ActionIcon>
+        </Group>
+      )}
+
+      <TextInput
+        value={value}
+        onChange={(e) => setValue(e.currentTarget.value)}
+        // Show the canonical form once the user pauses so what they type maps
+        // visibly to what gets stored.
+        onBlur={() => setValue(normalized)}
+        leftSection={
+          <Text size="xs" c="dimmed" pl={4} style={{ whiteSpace: "nowrap" }}>
+            {aliasPrefixLabel()}
+          </Text>
+        }
+        leftSectionWidth={Math.min(aliasPrefixLabel().length * 7 + 12, 180)}
+        placeholder={t("my-page")}
+        disabled={readOnly}
+        error={
+          showInvalid
+            ? t("Use 2-60 lowercase letters, digits and hyphens")
+            : showTaken
+              ? t("This address is already in use")
+              : undefined
+        }
+      />
+
+      <Group mt="xs" gap="xs">
+        <Button
+          size="compact-sm"
+          onClick={() => handleSave(false)}
+          loading={setAliasMutation.isPending}
+          disabled={readOnly || !isValid || unchanged}
+        >
+          {t("Save")}
+        </Button>
+        {currentAlias?.id && (
+          <Button
+            size="compact-sm"
+            variant="default"
+            color="red"
+            onClick={handleRemove}
+            loading={removeAliasMutation.isPending}
+            disabled={readOnly}
+          >
+            {t("Remove")}
+          </Button>
+        )}
+      </Group>
+
+      <Modal
+        opened={!!reassign}
+        onClose={() => setReassign(null)}
+        title={t("Move custom address?")}
+        centered
+        size="sm"
+      >
+        <Text size="sm">
+          {reassign?.currentPageTitle
+            ? t(
+                'The address "{{alias}}" currently points to "{{title}}". Move it to this page?',
+                {
+                  alias: reassign?.alias,
+                  title: reassign?.currentPageTitle,
+                },
+              )
+            : t(
+                'The address "{{alias}}" is already in use. Move it to this page?',
+                { alias: reassign?.alias },
+              )}
+        </Text>
+        <Group justify="flex-end" mt="md">
+          <Button variant="default" onClick={() => setReassign(null)}>
+            {t("Cancel")}
+          </Button>
+          <Button
+            color="red"
+            onClick={() => handleSave(true)}
+            loading={setAliasMutation.isPending}
+          >
+            {t("Move here")}
+          </Button>
+        </Group>
+      </Modal>
+    </>
+  );
+}

apps/client/src/features/share/components/share-modal.tsx

@@ -25,6 +25,7 @@ import CopyTextButton from "@/components/common/copy.tsx";
 import { getAppUrl } from "@/lib/config.ts";
 import { buildPageUrl } from "@/features/page/page.utils.ts";
 import classes from "@/features/share/components/share.module.css";
+import ShareAliasSection from "@/features/share/components/share-alias-section.tsx";
 import { useAtom } from "jotai";
 import { workspaceAtom } from "@/features/user/atoms/current-user-atom.ts";
 import { useSpaceQuery } from "@/features/space/queries/space-query.ts";
@@ -253,6 +254,9 @@ export default function ShareModal({ readOnly }: ShareModalProps) {
                     disabled={readOnly}
                   />
                 </Group>
+                {pageId && (
+                  <ShareAliasSection pageId={pageId} readOnly={readOnly} />
+                )}
               </>
             )}
           </>

apps/client/src/features/share/queries/share-query.ts

@@ -10,6 +10,8 @@ import { useTranslation } from "react-i18next";
 import {
   ICreateShare,
   IShare,
+  IShareAlias,
+  ISetShareAlias,
   ISharedItem,
   ISharedPage,
   ISharedPageTree,
@@ -20,11 +22,14 @@ import {
 import {
   createShare,
   deleteShare,
+  getShareAliasForPage,
   getSharedPageTree,
   getShareForPage,
   getShareInfo,
   getSharePageInfo,
   getShares,
+  removeShareAlias,
+  setShareAlias,
   updateShare,
 } from "@/features/share/services/share-service.ts";
 import { IPagination, QueryParams } from "@/lib/types.ts";
@@ -170,6 +175,72 @@ export function useDeleteShareMutation() {
   });
 }
 
+export function useShareAliasForPageQuery(
+  pageId: string,
+): UseQueryResult<IShareAlias | null, Error> {
+  return useQuery({
+    // The endpoint resolves to null when the page has no alias; normalize the
+    // absence so React Query never sees `undefined`.
+    queryKey: ["share-alias-for-page", pageId],
+    queryFn: async () => (await getShareAliasForPage(pageId)) ?? null,
+    enabled: !!pageId,
+    staleTime: 60 * 1000,
+    retry: false,
+  });
+}
+
+export function useSetShareAliasMutation() {
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
+
+  return useMutation<IShareAlias, Error, ISetShareAlias>({
+    mutationFn: (data) => setShareAlias(data),
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        predicate: (item) =>
+          ["share-alias-for-page", "share-list"].includes(
+            item.queryKey[0] as string,
+          ),
+      });
+    },
+    onError: (error) => {
+      // A 409 reassign-required is handled inline by the modal (it shows the
+      // "move address here?" confirmation), so don't surface a generic toast.
+      if (error?.["status"] === 409) return;
+      notifications.show({
+        message:
+          error?.["response"]?.data?.message || t("Failed to set custom address"),
+        color: "red",
+      });
+    },
+  });
+}
+
+export function useRemoveShareAliasMutation() {
+  const { t } = useTranslation();
+  const queryClient = useQueryClient();
+
+  return useMutation<void, Error, string>({
+    mutationFn: (aliasId) => removeShareAlias(aliasId),
+    onSuccess: () => {
+      queryClient.invalidateQueries({
+        predicate: (item) =>
+          ["share-alias-for-page", "share-list"].includes(
+            item.queryKey[0] as string,
+          ),
+      });
+    },
+    onError: (error) => {
+      notifications.show({
+        message:
+          error?.["response"]?.data?.message ||
+          t("Failed to remove custom address"),
+        color: "red",
+      });
+    },
+  });
+}
+
 export function useGetSharedPageTreeQuery(
   shareId: string,
 ): UseQueryResult<ISharedPageTree, Error> {

apps/client/src/features/share/services/share-service.ts

@@ -4,6 +4,9 @@ import { IPage } from "@/features/page/types/page.types";
 import {
   ICreateShare,
   IShare,
+  IShareAlias,
+  IShareAliasAvailability,
+  ISetShareAlias,
   ISharedItem,
   ISharedPage,
   ISharedPageTree,
@@ -57,3 +60,33 @@ export async function getSharedPageTree(
   const req = await api.post<ISharedPageTree>("/shares/tree", { shareId });
   return req.data;
 }
+
+export async function getShareAliasForPage(
+  pageId: string,
+): Promise<IShareAlias | null> {
+  const req = await api.post<IShareAlias | null>("/share-aliases/for-page", {
+    pageId,
+  });
+  return req.data;
+}
+
+export async function setShareAlias(
+  data: ISetShareAlias,
+): Promise<IShareAlias> {
+  const req = await api.post<IShareAlias>("/share-aliases/set", data);
+  return req.data;
+}
+
+export async function removeShareAlias(aliasId: string): Promise<void> {
+  await api.post("/share-aliases/remove", { aliasId });
+}
+
+export async function checkShareAliasAvailability(
+  alias: string,
+): Promise<IShareAliasAvailability> {
+  const req = await api.post<IShareAliasAvailability>(
+    "/share-aliases/availability",
+    { alias },
+  );
+  return req.data;
+}

apps/client/src/features/share/share-alias.util.test.ts

@@ -0,0 +1,32 @@
+import { describe, it, expect } from "vitest";
+import {
+  isValidShareAlias,
+  normalizeShareAlias,
+} from "@/features/share/share-alias.util.ts";
+
+// Mirrors the server-side util so the modal's live feedback matches what the
+// server will accept/store.
+describe("normalizeShareAlias", () => {
+  it("lowercases, trims and maps separators to single hyphens", () => {
+    expect(normalizeShareAlias("  My  Cool_Page ")).toBe("my-cool-page");
+  });
+
+  it("collapses repeated hyphens and trims edges", () => {
+    expect(normalizeShareAlias("--a---b--")).toBe("a-b");
+  });
+});
+
+describe("isValidShareAlias", () => {
+  it("accepts ascii hyphen-separated slugs of length 2..60", () => {
+    expect(isValidShareAlias("hello-world")).toBe(true);
+    expect(isValidShareAlias("a".repeat(60))).toBe(true);
+  });
+
+  it("rejects too short, edge/double hyphens, uppercase and non-ascii", () => {
+    expect(isValidShareAlias("a")).toBe(false);
+    expect(isValidShareAlias("-a")).toBe(false);
+    expect(isValidShareAlias("a--b")).toBe(false);
+    expect(isValidShareAlias("Hello")).toBe(false);
+    expect(isValidShareAlias("привет")).toBe(false);
+  });
+});

apps/client/src/features/share/share-alias.util.ts

@@ -0,0 +1,26 @@
+/**
+ * Client copy of the vanity share-alias helpers. Kept in sync with the server
+ * (`apps/server/src/core/share/share-alias.util.ts`) so live input feedback
+ * matches what the server will store/accept. ASCII-only, lowercase, hyphen
+ * separated, length 2..60.
+ */
+
+// Normalize a user-provided vanity alias into canonical ASCII storage form.
+export function normalizeShareAlias(raw: string): string {
+  return (raw ?? "")
+    .trim()
+    .toLowerCase()
+    .replace(/[\s_]+/g, "-")
+    .replace(/-{2,}/g, "-")
+    .replace(/^-+|-+$/g, "");
+}
+
+const ALIAS_RE = /^[a-z0-9]+(?:-[a-z0-9]+)*$/;
+export function isValidShareAlias(alias: string): boolean {
+  return (
+    typeof alias === "string" &&
+    alias.length >= 2 &&
+    alias.length <= 60 &&
+    ALIAS_RE.test(alias)
+  );
+}

apps/client/src/features/share/types/share.types.ts

@@ -75,6 +75,30 @@ export interface IShareInfoInput {
   pageId: string;
 }
 
+// Vanity /l/:alias pointer.
+export interface IShareAlias {
+  id: string;
+  workspaceId: string;
+  alias: string;
+  pageId: string | null;
+  creatorId: string | null;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface ISetShareAlias {
+  pageId: string;
+  alias: string;
+  confirmReassign?: boolean;
+}
+
+export interface IShareAliasAvailability {
+  alias: string;
+  valid: boolean;
+  available: boolean;
+  currentPageId: string | null;
+}
+
 export interface ISharedPageTree {
   share: IShare;
   pageTree: Partial<IPage[]>;

apps/server/src/core/ai-chat/ai-chat.controller.ts

@@ -32,6 +32,7 @@ import { AiTranscriptionService } from './ai-transcription.service';
 import {
   ChatIdDto,
   ExportChatDto,
+  GeneratePageTitleDto,
   GetChatMessagesDto,
   RenameChatDto,
 } from './dto/ai-chat.dto';
@@ -316,6 +317,43 @@ export class AiChatController {
     return { text };
   }
 
+  /**
+   * Generate a page title from supplied note content (#199). One-shot,
+   * non-streaming. Gated by the workspace AI flag (reusing settings.ai.generative,
+   * the same flag that gates the on-page generative AI menu); returns { title }.
+   * The endpoint NEVER writes the page — the client applies the title via the
+   * existing /pages/update route (which enforces edit permission), so access
+   * checks are not duplicated here. Throttled per user via AI_CHAT_THROTTLER.
+   */
+  @HttpCode(HttpStatus.OK)
+  @UseGuards(JwtAuthGuard, UserThrottlerGuard)
+  @Throttle({ [AI_CHAT_THROTTLER]: { limit: 20, ttl: 60000 } })
+  @Post('generate-page-title')
+  async generatePageTitle(
+    @Body() dto: GeneratePageTitleDto,
+    @AuthWorkspace() workspace: Workspace,
+  ): Promise<{ title: string }> {
+    const settings = (workspace.settings ?? {}) as {
+      ai?: { generative?: boolean };
+    };
+    if (settings.ai?.generative !== true) {
+      throw new ForbiddenException('AI title generation is disabled');
+    }
+    try {
+      const title = await this.aiChatService.generatePageTitle(
+        workspace.id,
+        dto.content,
+      );
+      return { title };
+    } catch (err) {
+      // Preserve meaningful HTTP errors (e.g. AiNotConfiguredException -> 503).
+      if (err instanceof HttpException) throw err;
+      // Surface the real provider/transport reason instead of an opaque 500.
+      this.logger.error('AI title generation failed', err as Error);
+      throw new ServiceUnavailableException(describeProviderError(err));
+    }
+  }
+
   /**
    * Ensure the chat exists, belongs to this workspace, AND was created by the
    * requesting user (per-user isolation). Throws ForbiddenException otherwise.

apps/server/src/core/ai-chat/ai-chat.generate-page-title.spec.ts

@@ -0,0 +1,122 @@
+import {
+  ForbiddenException,
+  HttpException,
+  ServiceUnavailableException,
+} from '@nestjs/common';
+import { AiChatController } from './ai-chat.controller';
+import { cleanGeneratedTitle } from './ai-chat.service';
+import type { Workspace } from '@docmost/db/types/entity.types';
+
+/**
+ * Pure post-processing of a model-generated title (#199): trims, strips a single
+ * pair of surrounding quotes, drops a trailing period, and hard-caps the length.
+ */
+describe('cleanGeneratedTitle', () => {
+  it('trims surrounding whitespace', () => {
+    expect(cleanGeneratedTitle('  Hello world  ')).toBe('Hello world');
+  });
+
+  it('strips a single pair of surrounding double quotes', () => {
+    expect(cleanGeneratedTitle('"My note"')).toBe('My note');
+  });
+
+  it('strips surrounding single quotes', () => {
+    expect(cleanGeneratedTitle("'My note'")).toBe('My note');
+  });
+
+  it('drops a trailing period', () => {
+    expect(cleanGeneratedTitle('A complete sentence.')).toBe(
+      'A complete sentence',
+    );
+  });
+
+  it('caps the result at 255 characters (the page-title column bound)', () => {
+    expect(cleanGeneratedTitle('x'.repeat(400))).toHaveLength(255);
+  });
+
+  it('returns an empty string for blank/garbage input', () => {
+    expect(cleanGeneratedTitle('   ')).toBe('');
+    expect(cleanGeneratedTitle('""')).toBe('');
+  });
+});
+
+/**
+ * Wiring spec for the #199 `POST /ai-chat/generate-page-title` endpoint. It must:
+ * gate on settings.ai.generative (403 when off), delegate to the service when on,
+ * rethrow HttpExceptions verbatim (e.g. AiNotConfiguredException -> 503), and map
+ * any other provider/transport fault to a 503. Exercised by instantiating the
+ * controller with hand-rolled mocks — no Nest graph, no DB.
+ */
+describe('AiChatController.generatePageTitle', () => {
+  const enabledWorkspace = {
+    id: 'ws1',
+    settings: { ai: { generative: true } },
+  } as unknown as Workspace;
+
+  function makeController(generate: jest.Mock) {
+    const aiChatService = { generatePageTitle: generate };
+    const controller = new AiChatController(
+      aiChatService as never,
+      {} as never,
+      {} as never,
+      {} as never,
+    );
+    return { controller, aiChatService };
+  }
+
+  it('forbids when the generative AI flag is off', async () => {
+    const generate = jest.fn();
+    const { controller } = makeController(generate);
+    const disabled = { id: 'ws1', settings: {} } as unknown as Workspace;
+    await expect(
+      controller.generatePageTitle({ content: 'body' }, disabled),
+    ).rejects.toBeInstanceOf(ForbiddenException);
+    expect(generate).not.toHaveBeenCalled();
+  });
+
+  it('forbids when settings.ai.generative is anything but exactly true', async () => {
+    const generate = jest.fn();
+    const { controller } = makeController(generate);
+    const ws = {
+      id: 'ws1',
+      settings: { ai: { generative: 'yes' } },
+    } as unknown as Workspace;
+    await expect(
+      controller.generatePageTitle({ content: 'body' }, ws),
+    ).rejects.toBeInstanceOf(ForbiddenException);
+  });
+
+  it('returns { title } from the service when enabled', async () => {
+    const generate = jest.fn().mockResolvedValue('Generated Title');
+    const { controller } = makeController(generate);
+    const res = await controller.generatePageTitle(
+      { content: 'some markdown body' },
+      enabledWorkspace,
+    );
+    expect(generate).toHaveBeenCalledWith('ws1', 'some markdown body');
+    expect(res).toEqual({ title: 'Generated Title' });
+  });
+
+  it('rethrows an HttpException from the service verbatim (e.g. 503 not configured)', async () => {
+    const notConfigured = new ServiceUnavailableException('AI not configured');
+    const generate = jest.fn().mockRejectedValue(notConfigured);
+    const { controller } = makeController(generate);
+    await expect(
+      controller.generatePageTitle({ content: 'body' }, enabledWorkspace),
+    ).rejects.toBe(notConfigured);
+  });
+
+  it('maps a non-HTTP provider error to a 503', async () => {
+    const generate = jest.fn().mockRejectedValue(new Error('socket hang up'));
+    const { controller } = makeController(generate);
+    // Silence the expected error log.
+    jest
+      .spyOn((controller as unknown as { logger: { error: () => void } }).logger, 'error')
+      .mockImplementation(() => undefined);
+    const err = await controller
+      .generatePageTitle({ content: 'body' }, enabledWorkspace)
+      .catch((e) => e);
+    expect(err).toBeInstanceOf(ServiceUnavailableException);
+    expect(err).toBeInstanceOf(HttpException);
+  });
+});

apps/server/src/core/ai-chat/ai-chat.service.ts

@@ -75,6 +75,18 @@ export function prepareAgentStep(
 
 export { MAX_AGENT_STEPS, FINAL_STEP_INSTRUCTION };
 
+// Pure, unit-testable post-processing for a model-generated title (#199): trim
+// whitespace, strip a single pair of surrounding quotes the model often adds,
+// drop a trailing period, and hard-cap the length to the page-title column.
+export function cleanGeneratedTitle(text: string): string {
+  return text
+    .trim()
+    .replace(/^["']|["']$/g, '')
+    .replace(/\.+$/, '')
+    .trim()
+    .slice(0, 255);
+}
+
 /**
  * Payload accepted from the client `useChat` POST body. We do NOT bind a strict
  * DTO (the global ValidationPipe whitelist would strip the useChat-specific
@@ -793,6 +805,27 @@ export class AiChatService implements OnModuleInit {
     }
   }
 
+  /**
+   * One-shot page-title generation from a note's content (#199). No tools, no
+   * streaming — mirrors generateTitle() but for an arbitrary note body supplied
+   * by the client, and RETURNS the title instead of writing it (the client
+   * applies it via the existing /pages/update route, which enforces edit
+   * permission). The content is truncated to keep the prompt cheap and within
+   * context limits. Throws AiNotConfiguredException (503) if AI is unconfigured.
+   */
+  async generatePageTitle(workspaceId: string, content: string): Promise<string> {
+    const model = await this.ai.getChatModel(workspaceId);
+    const { text } = await generateText({
+      model,
+      system:
+        'You generate a single concise, descriptive title for a note based on ' +
+        'its content. Reply with the title only — at most 8 words, no quotes, ' +
+        'no trailing punctuation, written in the same language as the note.',
+      prompt: content.slice(0, 8000),
+    });
+    return cleanGeneratedTitle(text);
+  }
+
   /**
    * Cheap, non-blocking title generation from the first user message. Uses
    * generateText (async) and writes the result back onto the chat row. Any

apps/server/src/core/ai-chat/dto/ai-chat.dto.ts

@@ -17,6 +17,16 @@ export class RenameChatDto {
   title: string;
 }
 
+/** One-shot page-title generation from note content (#199). */
+export class GeneratePageTitleDto {
+  // Note body as markdown/plain text. Capped to bound the prompt cost and
+  // reject abusive payloads; the service truncates again before the model call.
+  @IsString()
+  @MinLength(1)
+  @MaxLength(20000)
+  content: string;
+}
+
 /** Optional chat id for listing messages of a specific chat. */
 export class GetChatMessagesDto {
   @IsString()

apps/server/src/core/share/dto/share-alias.dto.ts

@@ -0,0 +1,44 @@
+import {
+  IsBoolean,
+  IsNotEmpty,
+  IsOptional,
+  IsString,
+} from 'class-validator';
+
+/**
+ * Create/retarget a vanity alias for a page. `confirmReassign` is the
+ * two-step guard for the "address already points at another page" case: the
+ * first call without it gets a 409 carrying the current target, the client
+ * confirms, and retries with `confirmReassign: true`.
+ */
+export class SetShareAliasDto {
+  @IsString()
+  @IsNotEmpty()
+  pageId: string;
+
+  @IsString()
+  @IsNotEmpty()
+  alias: string;
+
+  @IsBoolean()
+  @IsOptional()
+  confirmReassign?: boolean;
+}
+
+export class RemoveShareAliasDto {
+  @IsString()
+  @IsNotEmpty()
+  aliasId: string;
+}
+
+export class ShareAliasAvailabilityDto {
+  @IsString()
+  @IsNotEmpty()
+  alias: string;
+}
+
+export class ShareAliasForPageDto {
+  @IsString()
+  @IsNotEmpty()
+  pageId: string;
+}

apps/server/src/core/share/share-alias-redirect.controller.spec.ts

@@ -0,0 +1,252 @@
+import * as fs from 'node:fs';
+
+// `@sindresorhus/slugify` is ESM-only and not in jest's transformIgnorePatterns,
+// so the real module fails to parse under ts-jest. Stub it with a minimal,
+// deterministic slugifier — this spec asserts the controller's slug *assembly*
+// (`<title-slug>-<slugId>`, 70-char clamp, `untitled` fallback), not the upstream
+// slug algorithm. The factory keeps the real ESM module from ever being loaded.
+jest.mock('@sindresorhus/slugify', () => ({
+  __esModule: true,
+  default: (input: string) =>
+    String(input)
+      .toLowerCase()
+      .trim()
+      .replace(/[^a-z0-9]+/g, '-')
+      .replace(/^-+|-+$/g, ''),
+}));
+
+import { ShareAliasRedirectController } from './share-alias-redirect.controller';
+
+/**
+ * Routing/leak guard for the PUBLIC `GET /l/:alias` resolver.
+ *
+ * This is the most security-sensitive surface of the alias feature: an
+ * unauthenticated route that MUST serve the plain SPA index (exactly like any
+ * unknown path) for an unknown / dangling / no-longer-readable alias so that the
+ * existence of a name never leaks. Only a resolvable, still-readable alias may
+ * 302 to the canonical `/share/<key>/p/<title-slug>-<slugId>` page (302 — never
+ * 301 — because the target is retargetable). These tests pin that routing and
+ * the defensive percent-decoding, mirroring `share-seo.controller.routing.spec`.
+ */
+
+const STREAM_SENTINEL = { __isStream: true } as unknown as fs.ReadStream;
+
+// Stub fs at CALL time (jest.spyOn), NOT module load (jest.mock): the controller
+// transitively pulls bcrypt, whose native module is located by node-gyp-build
+// reading the filesystem at import time — a module-level fs mock breaks that.
+beforeEach(() => {
+  jest.spyOn(fs, 'existsSync').mockReturnValue(true);
+  jest.spyOn(fs, 'createReadStream').mockReturnValue(STREAM_SENTINEL);
+});
+afterEach(() => jest.restoreAllMocks());
+
+function makeRes() {
+  const res: any = {
+    sent: undefined as unknown,
+    statusCode: undefined as number | undefined,
+    redirectUrl: undefined as string | undefined,
+    type: jest.fn(() => res),
+    status: jest.fn((code: number) => {
+      res.statusCode = code;
+      return res;
+    }),
+    send: jest.fn((v: unknown) => {
+      res.sent = v;
+      return res;
+    }),
+    redirect: jest.fn((url: string, code: number) => {
+      res.redirectUrl = url;
+      res.statusCode = code;
+      return res;
+    }),
+  };
+  return res;
+}
+
+function makeController(opts: {
+  resolved?: { share: any; page: any } | null;
+  selfHosted?: boolean;
+}) {
+  const shareAliasService = {
+    resolveReadableTarget: jest.fn(async () => opts.resolved ?? null),
+  };
+  const workspaceRepo = {
+    findFirst: jest.fn(async () => ({ id: 'ws-self' })),
+    findByHostname: jest.fn(async (sub: string) =>
+      sub === 'acme' ? { id: 'ws-acme' } : null,
+    ),
+  };
+  const environmentService = {
+    isSelfHosted: jest.fn(() => opts.selfHosted ?? true),
+  };
+  const controller = new ShareAliasRedirectController(
+    shareAliasService as any,
+    workspaceRepo as any,
+    environmentService as any,
+  );
+  return { controller, shareAliasService, workspaceRepo, environmentService };
+}
+
+const selfReq: any = { raw: { headers: { host: 'self' } } };
+
+describe('ShareAliasRedirectController.resolve', () => {
+  it('302-redirects a resolvable alias to the canonical share page', async () => {
+    const { controller, shareAliasService } = makeController({
+      resolved: {
+        share: { key: 'SHAREKEY' },
+        page: { slugId: 'abc123', title: 'Quarterly Report' },
+      },
+    });
+    const res = makeRes();
+
+    await controller.resolve('promo', selfReq, res);
+
+    expect(shareAliasService.resolveReadableTarget).toHaveBeenCalledWith(
+      'promo',
+      'ws-self',
+    );
+    expect(res.redirect).toHaveBeenCalledWith(
+      '/share/SHAREKEY/p/quarterly-report-abc123',
+      302,
+    );
+    // No index stream was served on a hit.
+    expect(res.sent).toBeUndefined();
+  });
+
+  it('falls back to "untitled" in the slug when the target has no title', async () => {
+    const { controller } = makeController({
+      resolved: { share: { key: 'K' }, page: { slugId: 'sid', title: '' } },
+    });
+    const res = makeRes();
+
+    await controller.resolve('promo', selfReq, res);
+
+    expect(res.redirect).toHaveBeenCalledWith('/share/K/p/untitled-sid', 302);
+  });
+
+  it('clamps the title-slug to the first 70 characters of the page title', async () => {
+    // 119-char title; only the first 70 chars must reach the slug. The 70-char
+    // boundary deliberately falls mid-word ("Entire" -> "entir") so the clamp is
+    // unambiguous: anything past char 70 ("...e Fiscal Year...") must be dropped.
+    const longTitle =
+      'The Comprehensive Quarterly Financial Performance Report For The Entire Fiscal Year Two Thousand Twenty Five And Beyond';
+    const { controller } = makeController({
+      resolved: {
+        share: { key: 'K' },
+        page: { slugId: 'sid', title: longTitle },
+      },
+    });
+    const res = makeRes();
+
+    await controller.resolve('promo', selfReq, res);
+
+    expect(res.redirect).toHaveBeenCalledWith(
+      '/share/K/p/the-comprehensive-quarterly-financial-performance-report-for-the-entir-sid',
+      302,
+    );
+  });
+
+  it('streams the SPA index WITHOUT a 302 for an unknown/dangling/unreadable alias (no leak)', async () => {
+    const { controller, shareAliasService } = makeController({ resolved: null });
+    const res = makeRes();
+
+    await controller.resolve('does-not-exist', selfReq, res);
+
+    expect(shareAliasService.resolveReadableTarget).toHaveBeenCalled();
+    // The plain index stream was served and no redirect leaked alias existence.
+    expect(res.redirect).not.toHaveBeenCalled();
+    expect(res.sent).toBe(STREAM_SENTINEL);
+    expect(res.type).toHaveBeenCalledWith('text/html');
+  });
+
+  it('streams the SPA index without even resolving when the workspace is null', async () => {
+    // Subdomain host that maps to no workspace => workspace === null.
+    const { controller, shareAliasService, workspaceRepo } = makeController({
+      selfHosted: false,
+    });
+    const res = makeRes();
+    const req: any = { raw: { headers: { host: 'unknown.example.com' } } };
+
+    await controller.resolve('promo', req, res);
+
+    expect(workspaceRepo.findByHostname).toHaveBeenCalledWith('unknown');
+    // Never even attempts to resolve (alias existence cannot leak per-host).
+    expect(shareAliasService.resolveReadableTarget).not.toHaveBeenCalled();
+    expect(res.redirect).not.toHaveBeenCalled();
+    expect(res.sent).toBe(STREAM_SENTINEL);
+  });
+
+  it('defensively decodes broken percent-encoding and treats it as unknown', async () => {
+    const { controller, shareAliasService } = makeController({ resolved: null });
+    const res = makeRes();
+
+    // '%E0%A4%A' is invalid -> decodeURIComponent throws -> raw value is used,
+    // and the alias resolves to nothing (no crash, served as index).
+    await controller.resolve('%E0%A4%A', selfReq, res);
+
+    expect(shareAliasService.resolveReadableTarget).toHaveBeenCalledWith(
+      '%E0%A4%A',
+      'ws-self',
+    );
+    expect(res.redirect).not.toHaveBeenCalled();
+    expect(res.sent).toBe(STREAM_SENTINEL);
+  });
+
+  it('decodes a valid percent-encoded alias before resolving', async () => {
+    const { controller, shareAliasService } = makeController({ resolved: null });
+    const res = makeRes();
+
+    await controller.resolve('my%2Dlink', selfReq, res);
+
+    expect(shareAliasService.resolveReadableTarget).toHaveBeenCalledWith(
+      'my-link',
+      'ws-self',
+    );
+  });
+
+  it('resolves the workspace via findFirst on the self-hosted path', async () => {
+    const { controller, workspaceRepo, shareAliasService } = makeController({
+      selfHosted: true,
+      resolved: null,
+    });
+    const res = makeRes();
+
+    await controller.resolve('promo', selfReq, res);
+
+    expect(workspaceRepo.findFirst).toHaveBeenCalled();
+    expect(workspaceRepo.findByHostname).not.toHaveBeenCalled();
+    expect(shareAliasService.resolveReadableTarget).toHaveBeenCalledWith(
+      'promo',
+      'ws-self',
+    );
+  });
+
+  it('resolves the workspace via findByHostname (subdomain) on the cloud path', async () => {
+    const { controller, workspaceRepo, shareAliasService } = makeController({
+      selfHosted: false,
+      resolved: null,
+    });
+    const res = makeRes();
+    const req: any = { raw: { headers: { host: 'acme.example.com' } } };
+
+    await controller.resolve('promo', req, res);
+
+    expect(workspaceRepo.findByHostname).toHaveBeenCalledWith('acme');
+    expect(workspaceRepo.findFirst).not.toHaveBeenCalled();
+    expect(shareAliasService.resolveReadableTarget).toHaveBeenCalledWith(
+      'promo',
+      'ws-acme',
+    );
+  });
+
+  it('serves a 404 when no built client index exists', async () => {
+    jest.spyOn(fs, 'existsSync').mockReturnValue(false);
+    const { controller } = makeController({ resolved: null });
+    const res = makeRes();
+
+    await controller.resolve('promo', selfReq, res);
+
+    expect(res.status).toHaveBeenCalledWith(404);
+    expect(res.redirect).not.toHaveBeenCalled();
+  });
+});

apps/server/src/core/share/share-alias-redirect.controller.ts

@@ -0,0 +1,95 @@
+import { Controller, Get, Param, Req, Res } from '@nestjs/common';
+import { FastifyReply, FastifyRequest } from 'fastify';
+import { join } from 'path';
+import * as fs from 'node:fs';
+import slugify from '@sindresorhus/slugify';
+import { WorkspaceRepo } from '@docmost/db/repos/workspace/workspace.repo';
+import { EnvironmentService } from '../../integrations/environment/environment.service';
+import { Workspace } from '@docmost/db/types/entity.types';
+import { ShareAliasService } from './share-alias.service';
+
+/**
+ * Public resolver for vanity links `GET /l/:alias`. Excluded from the global
+ * `/api` prefix (see main.ts) and parallel to ShareSeoController.
+ *
+ * On a hit it issues a 302 (NEVER 301) to the canonical
+ * `/share/:key/p/:slug` page, so:
+ *   - the existing share render + SSR meta is reused verbatim (crawlers follow
+ *     the 302 and get the correct preview);
+ *   - because the alias target is mutable, a temporary redirect is always
+ *     re-resolved — a cached 301 would pin clients to the pre-swap page.
+ *
+ * Any unknown / dangling / no-longer-readable alias serves the plain SPA index
+ * (same as any unknown path) so the existence of a name never leaks.
+ */
+@Controller('l')
+export class ShareAliasRedirectController {
+  constructor(
+    private readonly shareAliasService: ShareAliasService,
+    private readonly workspaceRepo: WorkspaceRepo,
+    private readonly environmentService: EnvironmentService,
+  ) {}
+
+  @Get(':alias')
+  async resolve(
+    @Param('alias') rawAlias: string,
+    @Req() req: FastifyRequest,
+    @Res({ passthrough: false }) res: FastifyReply,
+  ) {
+    // NestJS does not apply middlewares to paths excluded from the global /api
+    // prefix, so the DomainMiddleware workspace resolution is duplicated here
+    // (same workaround as ShareSeoController).
+    let workspace: Workspace = null;
+    if (this.environmentService.isSelfHosted()) {
+      workspace = await this.workspaceRepo.findFirst();
+    } else {
+      const header = req.raw.headers.host;
+      const subdomain = header?.split('.')[0];
+      workspace = subdomain
+        ? await this.workspaceRepo.findByHostname(subdomain)
+        : null;
+    }
+
+    const clientDistPath = join(__dirname, '..', '..', '..', '..', 'client/dist');
+    const indexFilePath = join(clientDistPath, 'index.html');
+
+    let decoded = rawAlias;
+    try {
+      decoded = decodeURIComponent(rawAlias);
+    } catch {
+      // Malformed percent-encoding -> treat as unknown alias.
+    }
+
+    const resolved = workspace
+      ? await this.shareAliasService.resolveReadableTarget(
+          decoded,
+          workspace.id,
+        )
+      : null;
+
+    if (!resolved) {
+      return this.sendIndex(indexFilePath, res);
+    }
+
+    const slug = buildPageSlug(resolved.page.slugId, resolved.page.title);
+    // 302, NOT 301: the alias is retargetable, so the redirect must always be
+    // re-resolved by clients/crawlers.
+    return res.redirect(`/share/${resolved.share.key}/p/${slug}`, 302);
+  }
+
+  private sendIndex(indexFilePath: string, res: FastifyReply) {
+    if (!fs.existsSync(indexFilePath)) {
+      // No built client (e.g. API-only dev): nothing to serve.
+      res.status(404).send('Not found');
+      return;
+    }
+    const stream = fs.createReadStream(indexFilePath);
+    res.type('text/html').send(stream);
+  }
+}
+
+/** Canonical share page slug: `<title-slug>-<slugId>` (mirrors the client). */
+function buildPageSlug(slugId: string, title?: string): string {
+  const titleSlug = slugify(title?.substring(0, 70) || 'untitled');
+  return `${titleSlug}-${slugId}`;
+}

apps/server/src/core/share/share-alias.controller.spec.ts

@@ -0,0 +1,260 @@
+import {
+  BadRequestException,
+  ForbiddenException,
+  NotFoundException,
+} from '@nestjs/common';
+import { ShareAliasController } from './share-alias.controller';
+
+/**
+ * Authz-gate tests for the authenticated alias management controller. The access
+ * decisions for creating/retargeting/removing an alias live in THIS controller
+ * (the service spec delegates authorization to the caller), so each gate is
+ * pinned here against mocked PageRepo / ShareService / ShareAliasService /
+ * PageAccessService. A regression that drops any gate must fail here.
+ */
+describe('ShareAliasController authz gates', () => {
+  function makeController() {
+    const shareAliasService = {
+      setAlias: jest.fn(async () => ({ id: 'alias-1' })),
+      removeAlias: jest.fn(async () => undefined),
+      getAliasById: jest.fn(),
+      getAliasForPage: jest.fn(),
+      checkAvailability: jest.fn(),
+    };
+    const shareService = {
+      resolveReadableSharePage: jest.fn(),
+      isSharingAllowed: jest.fn(),
+    };
+    const pageRepo = { findById: jest.fn() };
+    const pageAccessService = {
+      validateCanEdit: jest.fn(async () => undefined),
+      validateCanView: jest.fn(async () => undefined),
+    };
+    const controller = new ShareAliasController(
+      shareAliasService as any,
+      shareService as any,
+      pageRepo as any,
+      pageAccessService as any,
+    );
+    return {
+      controller,
+      shareAliasService,
+      shareService,
+      pageRepo,
+      pageAccessService,
+    };
+  }
+
+  const user: any = { id: 'u-1' };
+  const workspace: any = { id: 'ws-1' };
+
+  describe('set', () => {
+    it('throws NotFoundException for a nonexistent page', async () => {
+      const { controller, pageRepo, pageAccessService } = makeController();
+      pageRepo.findById.mockResolvedValue(null);
+
+      await expect(
+        controller.set({ pageId: 'p-x', alias: 'promo' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(NotFoundException);
+      expect(pageAccessService.validateCanEdit).not.toHaveBeenCalled();
+    });
+
+    it('throws NotFoundException for a page in another workspace', async () => {
+      const { controller, pageRepo } = makeController();
+      pageRepo.findById.mockResolvedValue({
+        id: 'p-1',
+        workspaceId: 'ws-OTHER',
+      });
+
+      await expect(
+        controller.set({ pageId: 'p-1', alias: 'promo' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(NotFoundException);
+    });
+
+    it('enforces validateCanEdit before setting the alias', async () => {
+      const { controller, pageRepo, pageAccessService, shareService } =
+        makeController();
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      pageAccessService.validateCanEdit.mockRejectedValue(
+        new ForbiddenException('no edit'),
+      );
+
+      await expect(
+        controller.set({ pageId: 'p-1', alias: 'promo' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(ForbiddenException);
+      // Gate short-circuits before any share resolution.
+      expect(shareService.resolveReadableSharePage).not.toHaveBeenCalled();
+    });
+
+    it('throws BadRequestException when the page is not publicly shared', async () => {
+      const { controller, pageRepo, shareService } = makeController();
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      shareService.resolveReadableSharePage.mockResolvedValue(null);
+
+      await expect(
+        controller.set({ pageId: 'p-1', alias: 'promo' } as any, user, workspace),
+      ).rejects.toThrow('Page is not publicly shared');
+      await expect(
+        controller.set({ pageId: 'p-1', alias: 'promo' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(BadRequestException);
+    });
+
+    it('throws ForbiddenException when public sharing is disabled', async () => {
+      const { controller, pageRepo, shareService } = makeController();
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      shareService.resolveReadableSharePage.mockResolvedValue({
+        share: { spaceId: 'sp-1' },
+      });
+      shareService.isSharingAllowed.mockResolvedValue(false);
+
+      await expect(
+        controller.set({ pageId: 'p-1', alias: 'promo' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(ForbiddenException);
+    });
+
+    it('delegates to setAlias on the happy path with all gates passed', async () => {
+      const { controller, pageRepo, shareService, shareAliasService } =
+        makeController();
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      shareService.resolveReadableSharePage.mockResolvedValue({
+        share: { spaceId: 'sp-1' },
+      });
+      shareService.isSharingAllowed.mockResolvedValue(true);
+
+      const result = await controller.set(
+        { pageId: 'p-1', alias: 'promo', confirmReassign: true } as any,
+        user,
+        workspace,
+      );
+
+      expect(shareAliasService.setAlias).toHaveBeenCalledWith({
+        workspaceId: 'ws-1',
+        pageId: 'p-1',
+        creatorId: 'u-1',
+        alias: 'promo',
+        confirmReassign: true,
+      });
+      expect(result).toEqual({ id: 'alias-1' });
+    });
+  });
+
+  describe('remove', () => {
+    it('throws NotFoundException for an unknown alias', async () => {
+      const { controller, shareAliasService } = makeController();
+      shareAliasService.getAliasById.mockResolvedValue(null);
+
+      await expect(
+        controller.remove({ aliasId: 'a-x' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(NotFoundException);
+      expect(shareAliasService.removeAlias).not.toHaveBeenCalled();
+    });
+
+    it('requires validateCanEdit on the current target before removing', async () => {
+      const { controller, shareAliasService, pageRepo, pageAccessService } =
+        makeController();
+      shareAliasService.getAliasById.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-1',
+      });
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      pageAccessService.validateCanEdit.mockRejectedValue(
+        new ForbiddenException('no edit'),
+      );
+
+      await expect(
+        controller.remove({ aliasId: 'a-1' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(ForbiddenException);
+      expect(shareAliasService.removeAlias).not.toHaveBeenCalled();
+    });
+
+    it('removes a dangling alias (pageId null) WITHOUT an edit check', async () => {
+      const { controller, shareAliasService, pageRepo, pageAccessService } =
+        makeController();
+      shareAliasService.getAliasById.mockResolvedValue({
+        id: 'a-1',
+        pageId: null,
+      });
+
+      await controller.remove({ aliasId: 'a-1' } as any, user, workspace);
+
+      expect(pageRepo.findById).not.toHaveBeenCalled();
+      expect(pageAccessService.validateCanEdit).not.toHaveBeenCalled();
+      expect(shareAliasService.removeAlias).toHaveBeenCalledWith('a-1', 'ws-1');
+    });
+
+    it('removes when the editor can edit the current target', async () => {
+      const { controller, shareAliasService, pageRepo, pageAccessService } =
+        makeController();
+      shareAliasService.getAliasById.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-1',
+      });
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+
+      await controller.remove({ aliasId: 'a-1' } as any, user, workspace);
+
+      expect(pageAccessService.validateCanEdit).toHaveBeenCalled();
+      expect(shareAliasService.removeAlias).toHaveBeenCalledWith('a-1', 'ws-1');
+    });
+
+    it('removes even if the recorded target page no longer exists', async () => {
+      const { controller, shareAliasService, pageRepo, pageAccessService } =
+        makeController();
+      shareAliasService.getAliasById.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-gone',
+      });
+      pageRepo.findById.mockResolvedValue(null);
+
+      await controller.remove({ aliasId: 'a-1' } as any, user, workspace);
+
+      expect(pageAccessService.validateCanEdit).not.toHaveBeenCalled();
+      expect(shareAliasService.removeAlias).toHaveBeenCalledWith('a-1', 'ws-1');
+    });
+  });
+
+  describe('forPage', () => {
+    it('throws NotFoundException for a cross-workspace/nonexistent page', async () => {
+      const { controller, pageRepo, pageAccessService } = makeController();
+      pageRepo.findById.mockResolvedValue({
+        id: 'p-1',
+        workspaceId: 'ws-OTHER',
+      });
+
+      await expect(
+        controller.forPage({ pageId: 'p-1' } as any, user, workspace),
+      ).rejects.toBeInstanceOf(NotFoundException);
+      expect(pageAccessService.validateCanView).not.toHaveBeenCalled();
+    });
+
+    it('requires validateCanView and returns the alias (or null)', async () => {
+      const { controller, pageRepo, pageAccessService, shareAliasService } =
+        makeController();
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      shareAliasService.getAliasForPage.mockResolvedValue({ id: 'a-1' });
+
+      const result = await controller.forPage(
+        { pageId: 'p-1' } as any,
+        user,
+        workspace,
+      );
+
+      expect(pageAccessService.validateCanView).toHaveBeenCalled();
+      expect(result).toEqual({ id: 'a-1' });
+    });
+
+    it('returns null when the page has no alias', async () => {
+      const { controller, pageRepo, shareAliasService } = makeController();
+      pageRepo.findById.mockResolvedValue({ id: 'p-1', workspaceId: 'ws-1' });
+      shareAliasService.getAliasForPage.mockResolvedValue(undefined);
+
+      const result = await controller.forPage(
+        { pageId: 'p-1' } as any,
+        user,
+        workspace,
+      );
+
+      expect(result).toBeNull();
+    });
+  });
+});

apps/server/src/core/share/share-alias.controller.ts

@@ -0,0 +1,139 @@
+import {
+  BadRequestException,
+  Body,
+  Controller,
+  ForbiddenException,
+  HttpCode,
+  HttpStatus,
+  NotFoundException,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
+import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
+import { AuthUser } from '../../common/decorators/auth-user.decorator';
+import { AuthWorkspace } from '../../common/decorators/auth-workspace.decorator';
+import { User, Workspace } from '@docmost/db/types/entity.types';
+import { PageRepo } from '@docmost/db/repos/page/page.repo';
+import { PageAccessService } from '../page/page-access/page-access.service';
+import { ShareService } from './share.service';
+import { ShareAliasService } from './share-alias.service';
+import {
+  RemoveShareAliasDto,
+  SetShareAliasDto,
+  ShareAliasAvailabilityDto,
+  ShareAliasForPageDto,
+} from './dto/share-alias.dto';
+
+/**
+ * Authenticated management of vanity `/l/:alias` links. The PUBLIC resolve path
+ * lives in `ShareAliasRedirectController` (`/l/:alias`); this controller only
+ * creates/retargets/removes/looks-up aliases for editors.
+ */
+@UseGuards(JwtAuthGuard)
+@Controller('share-aliases')
+export class ShareAliasController {
+  constructor(
+    private readonly shareAliasService: ShareAliasService,
+    private readonly shareService: ShareService,
+    private readonly pageRepo: PageRepo,
+    private readonly pageAccessService: PageAccessService,
+  ) {}
+
+  @HttpCode(HttpStatus.OK)
+  @Post('set')
+  async set(
+    @Body() dto: SetShareAliasDto,
+    @AuthUser() user: User,
+    @AuthWorkspace() workspace: Workspace,
+  ) {
+    const page = await this.pageRepo.findById(dto.pageId);
+    if (!page || page.workspaceId !== workspace.id) {
+      throw new NotFoundException('Page not found');
+    }
+
+    // Editing the page is required to point an address at it.
+    await this.pageAccessService.validateCanEdit(page, user);
+
+    // The page must currently be publicly readable through the share graph; an
+    // alias to a non-shared page would only ever 404.
+    const resolved = await this.shareService.resolveReadableSharePage(
+      undefined,
+      page.id,
+      workspace.id,
+    );
+    if (!resolved) {
+      throw new BadRequestException('Page is not publicly shared');
+    }
+
+    const sharingAllowed = await this.shareService.isSharingAllowed(
+      workspace.id,
+      resolved.share.spaceId,
+    );
+    if (!sharingAllowed) {
+      throw new ForbiddenException('Public sharing is disabled');
+    }
+
+    return this.shareAliasService.setAlias({
+      workspaceId: workspace.id,
+      pageId: page.id,
+      creatorId: user.id,
+      alias: dto.alias,
+      confirmReassign: dto.confirmReassign,
+    });
+  }
+
+  @HttpCode(HttpStatus.OK)
+  @Post('remove')
+  async remove(
+    @Body() dto: RemoveShareAliasDto,
+    @AuthUser() user: User,
+    @AuthWorkspace() workspace: Workspace,
+  ) {
+    const alias = await this.shareAliasService.getAliasById(
+      dto.aliasId,
+      workspace.id,
+    );
+    if (!alias) {
+      throw new NotFoundException('Alias not found');
+    }
+
+    // Only someone who can edit the (current) target page may free the address.
+    // A dangling alias (page deleted) can be removed by any workspace member.
+    if (alias.pageId) {
+      const page = await this.pageRepo.findById(alias.pageId);
+      if (page) {
+        await this.pageAccessService.validateCanEdit(page, user);
+      }
+    }
+
+    await this.shareAliasService.removeAlias(alias.id, workspace.id);
+  }
+
+  @HttpCode(HttpStatus.OK)
+  @Post('availability')
+  async availability(
+    @Body() dto: ShareAliasAvailabilityDto,
+    @AuthWorkspace() workspace: Workspace,
+  ) {
+    return this.shareAliasService.checkAvailability(dto.alias, workspace.id);
+  }
+
+  @HttpCode(HttpStatus.OK)
+  @Post('for-page')
+  async forPage(
+    @Body() dto: ShareAliasForPageDto,
+    @AuthUser() user: User,
+    @AuthWorkspace() workspace: Workspace,
+  ) {
+    const page = await this.pageRepo.findById(dto.pageId);
+    if (!page || page.workspaceId !== workspace.id) {
+      throw new NotFoundException('Page not found');
+    }
+    await this.pageAccessService.validateCanView(page, user);
+
+    return (
+      (await this.shareAliasService.getAliasForPage(page.id, workspace.id)) ??
+      null
+    );
+  }
+}

apps/server/src/core/share/share-alias.service.spec.ts

@@ -0,0 +1,252 @@
+import { BadRequestException, ConflictException } from '@nestjs/common';
+import { ShareAliasService } from './share-alias.service';
+
+/**
+ * Behaviour tests for the alias write/resolve semantics: create vs no-op vs the
+ * 409 reassign guard, uniqueness-race handling, availability probe, and the
+ * request-time readable-target resolution (which re-runs the share boundary).
+ */
+describe('ShareAliasService', () => {
+  function makeService() {
+    const shareAliasRepo = {
+      findByAliasAndWorkspace: jest.fn(),
+      findByPageId: jest.fn(),
+      findById: jest.fn(),
+      insert: jest.fn(),
+      updatePageId: jest.fn(),
+      delete: jest.fn(),
+    };
+    const pageRepo = { findById: jest.fn() };
+    const shareService = {
+      resolveReadableSharePage: jest.fn(),
+      isSharingAllowed: jest.fn(),
+    };
+    const service = new ShareAliasService(
+      shareAliasRepo as any,
+      pageRepo as any,
+      shareService as any,
+    );
+    return { service, shareAliasRepo, pageRepo, shareService };
+  }
+
+  describe('setAlias', () => {
+    it('rejects an invalid alias before touching the db', async () => {
+      const { service, shareAliasRepo } = makeService();
+      await expect(
+        service.setAlias({
+          workspaceId: 'ws-1',
+          pageId: 'p-1',
+          creatorId: 'u-1',
+          alias: 'A', // too short + uppercase
+        }),
+      ).rejects.toBeInstanceOf(BadRequestException);
+      expect(shareAliasRepo.findByAliasAndWorkspace).not.toHaveBeenCalled();
+    });
+
+    it('normalizes then inserts a brand-new alias', async () => {
+      const { service, shareAliasRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue(undefined);
+      shareAliasRepo.insert.mockResolvedValue({ id: 'a-1', alias: 'my-page' });
+
+      const res = await service.setAlias({
+        workspaceId: 'ws-1',
+        pageId: 'p-1',
+        creatorId: 'u-1',
+        alias: '  My Page ',
+      });
+
+      expect(shareAliasRepo.findByAliasAndWorkspace).toHaveBeenCalledWith(
+        'my-page',
+        'ws-1',
+      );
+      expect(shareAliasRepo.insert).toHaveBeenCalledWith({
+        workspaceId: 'ws-1',
+        alias: 'my-page',
+        pageId: 'p-1',
+        creatorId: 'u-1',
+      });
+      expect(res).toMatchObject({ id: 'a-1' });
+    });
+
+    it('is a no-op when the alias already points at the same page', async () => {
+      const { service, shareAliasRepo } = makeService();
+      const existing = { id: 'a-1', alias: 'foo', pageId: 'p-1' };
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue(existing);
+
+      const res = await service.setAlias({
+        workspaceId: 'ws-1',
+        pageId: 'p-1',
+        creatorId: 'u-1',
+        alias: 'foo',
+      });
+
+      expect(res).toBe(existing);
+      expect(shareAliasRepo.insert).not.toHaveBeenCalled();
+      expect(shareAliasRepo.updatePageId).not.toHaveBeenCalled();
+    });
+
+    it('throws 409 with current target when name is taken and not confirmed', async () => {
+      const { service, shareAliasRepo, pageRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue({
+        id: 'a-1',
+        alias: 'foo',
+        pageId: 'p-other',
+      });
+      pageRepo.findById.mockResolvedValue({ id: 'p-other', title: 'Other' });
+
+      try {
+        await service.setAlias({
+          workspaceId: 'ws-1',
+          pageId: 'p-1',
+          creatorId: 'u-1',
+          alias: 'foo',
+        });
+        fail('expected ConflictException');
+      } catch (err) {
+        expect(err).toBeInstanceOf(ConflictException);
+        expect((err as ConflictException).getResponse()).toMatchObject({
+          code: 'ALIAS_REASSIGN_REQUIRED',
+          currentPageId: 'p-other',
+          currentPageTitle: 'Other',
+        });
+      }
+      expect(shareAliasRepo.updatePageId).not.toHaveBeenCalled();
+    });
+
+    it('retargets (UPDATE page_id) when confirmReassign is set', async () => {
+      const { service, shareAliasRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue({
+        id: 'a-1',
+        alias: 'foo',
+        pageId: 'p-other',
+      });
+      shareAliasRepo.updatePageId.mockResolvedValue({ id: 'a-1', pageId: 'p-1' });
+
+      const res = await service.setAlias({
+        workspaceId: 'ws-1',
+        pageId: 'p-1',
+        creatorId: 'u-1',
+        alias: 'foo',
+        confirmReassign: true,
+      });
+
+      expect(shareAliasRepo.updatePageId).toHaveBeenCalledWith(
+        'a-1',
+        'p-1',
+        'ws-1',
+      );
+      expect(res).toMatchObject({ pageId: 'p-1' });
+    });
+
+    it('maps a unique-violation race to 409', async () => {
+      const { service, shareAliasRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue(undefined);
+      shareAliasRepo.insert.mockRejectedValue({ code: '23505' });
+
+      await expect(
+        service.setAlias({
+          workspaceId: 'ws-1',
+          pageId: 'p-1',
+          creatorId: 'u-1',
+          alias: 'foo',
+        }),
+      ).rejects.toBeInstanceOf(ConflictException);
+    });
+  });
+
+  describe('checkAvailability', () => {
+    it('reports invalid for a bad slug without a db hit', async () => {
+      const { service, shareAliasRepo } = makeService();
+      const res = await service.checkAvailability('Bad Slug!', 'ws-1');
+      expect(res).toMatchObject({ valid: false, available: false });
+      expect(shareAliasRepo.findByAliasAndWorkspace).not.toHaveBeenCalled();
+    });
+
+    it('reports available when no row exists', async () => {
+      const { service, shareAliasRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue(undefined);
+      const res = await service.checkAvailability('free-name', 'ws-1');
+      expect(res).toMatchObject({
+        alias: 'free-name',
+        valid: true,
+        available: true,
+        currentPageId: null,
+      });
+    });
+
+    it('reports taken with the current target page', async () => {
+      const { service, shareAliasRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-9',
+      });
+      const res = await service.checkAvailability('taken', 'ws-1');
+      expect(res).toMatchObject({ available: false, currentPageId: 'p-9' });
+    });
+  });
+
+  describe('resolveReadableTarget', () => {
+    it('returns null for an invalid alias', async () => {
+      const { service } = makeService();
+      expect(await service.resolveReadableTarget('!!', 'ws-1')).toBeNull();
+    });
+
+    it('returns null for an unknown or dangling alias', async () => {
+      const { service, shareAliasRepo } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValueOnce(undefined);
+      expect(await service.resolveReadableTarget('foo', 'ws-1')).toBeNull();
+
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValueOnce({
+        id: 'a-1',
+        pageId: null,
+      });
+      expect(await service.resolveReadableTarget('foo', 'ws-1')).toBeNull();
+    });
+
+    it('returns null when the page is no longer publicly readable', async () => {
+      const { service, shareAliasRepo, shareService } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-1',
+      });
+      shareService.resolveReadableSharePage.mockResolvedValue(null);
+      expect(await service.resolveReadableTarget('foo', 'ws-1')).toBeNull();
+    });
+
+    it('returns null when sharing is disabled for the space', async () => {
+      const { service, shareAliasRepo, shareService } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-1',
+      });
+      shareService.resolveReadableSharePage.mockResolvedValue({
+        share: { key: 'k', spaceId: 's-1' },
+        page: { slugId: 'sid', title: 'T' },
+      });
+      shareService.isSharingAllowed.mockResolvedValue(false);
+      expect(await service.resolveReadableTarget('foo', 'ws-1')).toBeNull();
+    });
+
+    it('returns the resolved share+page on success', async () => {
+      const { service, shareAliasRepo, shareService } = makeService();
+      shareAliasRepo.findByAliasAndWorkspace.mockResolvedValue({
+        id: 'a-1',
+        pageId: 'p-1',
+      });
+      const resolved = {
+        share: { key: 'k', spaceId: 's-1' },
+        page: { slugId: 'sid', title: 'T' },
+      };
+      shareService.resolveReadableSharePage.mockResolvedValue(resolved);
+      shareService.isSharingAllowed.mockResolvedValue(true);
+
+      const res = await service.resolveReadableTarget('FOO', 'ws-1');
+      expect(res).toBe(resolved);
+      // alias was normalized to lowercase before lookup
+      expect(shareAliasRepo.findByAliasAndWorkspace).toHaveBeenCalledWith(
+        'foo',
+        'ws-1',
+      );
+    });
+  });
+});

apps/server/src/core/share/share-alias.service.ts

@@ -0,0 +1,187 @@
+import {
+  BadRequestException,
+  ConflictException,
+  Injectable,
+  Logger,
+} from '@nestjs/common';
+import { ShareAliasRepo } from '@docmost/db/repos/share-alias/share-alias.repo';
+import { PageRepo } from '@docmost/db/repos/page/page.repo';
+import { ShareService } from './share.service';
+import { Page, ShareAlias } from '@docmost/db/types/entity.types';
+import { isValidShareAlias, normalizeShareAlias } from './share-alias.util';
+
+/** Postgres unique_violation; the (workspace_id, alias) constraint races here. */
+const PG_UNIQUE_VIOLATION = '23505';
+
+export interface ResolvedAliasTarget {
+  share: NonNullable<
+    Awaited<ReturnType<ShareService['resolveReadableSharePage']>>
+  >['share'];
+  page: Page;
+}
+
+@Injectable()
+export class ShareAliasService {
+  private readonly logger = new Logger(ShareAliasService.name);
+
+  constructor(
+    private readonly shareAliasRepo: ShareAliasRepo,
+    private readonly pageRepo: PageRepo,
+    private readonly shareService: ShareService,
+  ) {}
+
+  /**
+   * Create or retarget a vanity alias. The alias is workspace-scoped:
+   *   - no row for this name        -> INSERT a new pointer
+   *   - row already points at pageId -> no-op (idempotent)
+   *   - row points elsewhere         -> the "swap". Without confirmReassign we
+   *     throw 409 carrying the current target so the client can confirm; with
+   *     it we UPDATE the single row's page_id (every /l/<alias> link follows the
+   *     302 to the new page instantly — no stale 301 cache).
+   *
+   * Caller is responsible for authorizing the page (edit rights + public
+   * readability); this method owns only the alias-name semantics.
+   */
+  async setAlias(opts: {
+    workspaceId: string;
+    pageId: string;
+    creatorId: string;
+    alias: string;
+    confirmReassign?: boolean;
+  }): Promise<ShareAlias> {
+    const { workspaceId, pageId, creatorId, confirmReassign } = opts;
+    const alias = normalizeShareAlias(opts.alias);
+    if (!isValidShareAlias(alias)) {
+      throw new BadRequestException(
+        'Invalid alias. Use 2-60 lowercase letters, digits and hyphens.',
+      );
+    }
+
+    const existing = await this.shareAliasRepo.findByAliasAndWorkspace(
+      alias,
+      workspaceId,
+    );
+
+    if (!existing) {
+      try {
+        return await this.shareAliasRepo.insert({
+          workspaceId,
+          alias,
+          pageId,
+          creatorId,
+        });
+      } catch (err: any) {
+        // Lost a uniqueness race: another request claimed the name first.
+        if (err?.code === PG_UNIQUE_VIOLATION) {
+          throw new ConflictException({ message: 'Alias already taken' });
+        }
+        this.logger.error(err);
+        throw new BadRequestException('Failed to set alias');
+      }
+    }
+
+    // Already points at this page -> nothing to do.
+    if (existing.pageId === pageId) {
+      return existing;
+    }
+
+    // Name occupied by a different (or dangling) target: require confirmation.
+    if (!confirmReassign) {
+      const currentPage = existing.pageId
+        ? await this.pageRepo.findById(existing.pageId)
+        : null;
+      throw new ConflictException({
+        message: 'Alias already in use',
+        code: 'ALIAS_REASSIGN_REQUIRED',
+        currentPageId: existing.pageId,
+        currentPageTitle: currentPage?.title ?? null,
+      });
+    }
+
+    return this.shareAliasRepo.updatePageId(existing.id, pageId, workspaceId);
+  }
+
+  /** Free a vanity name (no history kept). */
+  async removeAlias(aliasId: string, workspaceId: string): Promise<void> {
+    await this.shareAliasRepo.delete(aliasId, workspaceId);
+  }
+
+  /** Debounced availability probe for the modal. */
+  async checkAvailability(
+    rawAlias: string,
+    workspaceId: string,
+  ): Promise<{
+    alias: string;
+    valid: boolean;
+    available: boolean;
+    currentPageId: string | null;
+  }> {
+    const alias = normalizeShareAlias(rawAlias);
+    if (!isValidShareAlias(alias)) {
+      return { alias, valid: false, available: false, currentPageId: null };
+    }
+    const existing = await this.shareAliasRepo.findByAliasAndWorkspace(
+      alias,
+      workspaceId,
+    );
+    return {
+      alias,
+      valid: true,
+      available: !existing,
+      currentPageId: existing?.pageId ?? null,
+    };
+  }
+
+  /** A single alias row scoped to the workspace, or undefined. */
+  getAliasById(
+    aliasId: string,
+    workspaceId: string,
+  ): Promise<ShareAlias | undefined> {
+    return this.shareAliasRepo.findById(aliasId, workspaceId);
+  }
+
+  /** The alias currently targeting a page (modal display), or undefined. */
+  getAliasForPage(
+    pageId: string,
+    workspaceId: string,
+  ): Promise<ShareAlias | undefined> {
+    return this.shareAliasRepo.findByPageId(pageId, workspaceId);
+  }
+
+  /**
+   * Resolve a vanity alias to the canonical, publicly-READABLE share page, or
+   * null. This re-runs the authoritative share boundary at request time (so a
+   * later-unshared / restricted / sharing-disabled target collapses to null and
+   * the caller serves the generic SPA 404 — no existence leak). The alias row
+   * itself is just a pointer; this is where access is actually decided.
+   */
+  async resolveReadableTarget(
+    rawAlias: string,
+    workspaceId: string,
+  ): Promise<ResolvedAliasTarget | null> {
+    const alias = normalizeShareAlias(rawAlias);
+    if (!isValidShareAlias(alias)) return null;
+
+    const aliasRow = await this.shareAliasRepo.findByAliasAndWorkspace(
+      alias,
+      workspaceId,
+    );
+    // Unknown name or a dangling alias (target page deleted) -> not resolvable.
+    if (!aliasRow?.pageId) return null;
+
+    const resolved = await this.shareService.resolveReadableSharePage(
+      undefined,
+      aliasRow.pageId,
+      workspaceId,
+    );
+    if (!resolved) return null;
+
+    const sharingAllowed = await this.shareService.isSharingAllowed(
+      workspaceId,
+      resolved.share.spaceId,
+    );
+    if (!sharingAllowed) return null;
+
+    return resolved;
+  }
+}

apps/server/src/core/share/share-alias.util.spec.ts

@@ -0,0 +1,60 @@
+import { isValidShareAlias, normalizeShareAlias } from './share-alias.util';
+
+describe('normalizeShareAlias', () => {
+  it('lowercases and trims', () => {
+    expect(normalizeShareAlias('  HelloWorld  ')).toBe('helloworld');
+  });
+
+  it('converts spaces and underscores to single hyphens', () => {
+    expect(normalizeShareAlias('my cool   page')).toBe('my-cool-page');
+    expect(normalizeShareAlias('my_cool_page')).toBe('my-cool-page');
+  });
+
+  it('collapses repeated hyphens and trims edge hyphens', () => {
+    expect(normalizeShareAlias('--a---b--')).toBe('a-b');
+  });
+
+  it('handles null/undefined defensively', () => {
+    expect(normalizeShareAlias(undefined as unknown as string)).toBe('');
+  });
+});
+
+describe('isValidShareAlias', () => {
+  it('accepts ascii lowercase hyphen-separated slugs', () => {
+    expect(isValidShareAlias('hello')).toBe(true);
+    expect(isValidShareAlias('hello-world-2')).toBe(true);
+    expect(isValidShareAlias('a1')).toBe(true);
+  });
+
+  it('rejects too short / too long', () => {
+    expect(isValidShareAlias('a')).toBe(false);
+    expect(isValidShareAlias('a'.repeat(61))).toBe(false);
+    expect(isValidShareAlias('a'.repeat(60))).toBe(true);
+  });
+
+  it('rejects leading/trailing/double hyphens', () => {
+    expect(isValidShareAlias('-abc')).toBe(false);
+    expect(isValidShareAlias('abc-')).toBe(false);
+    expect(isValidShareAlias('a--b')).toBe(false);
+  });
+
+  it('rejects uppercase, cyrillic and other non-ascii', () => {
+    expect(isValidShareAlias('Hello')).toBe(false);
+    expect(isValidShareAlias('привет')).toBe(false);
+    expect(isValidShareAlias('a b')).toBe(false);
+    expect(isValidShareAlias('a_b')).toBe(false);
+    expect(isValidShareAlias('a.b')).toBe(false);
+  });
+
+  it('normalize + validate round-trips a messy input to a valid slug', () => {
+    const alias = normalizeShareAlias('  My  Cool_Page!! ');
+    // "!!" is not stripped by normalize (only case/separators), so the result
+    // still fails validation — the charset gate is intentionally separate.
+    expect(alias).toBe('my-cool-page!!');
+    expect(isValidShareAlias(alias)).toBe(false);
+
+    const ok = normalizeShareAlias('  My  Cool Page ');
+    expect(ok).toBe('my-cool-page');
+    expect(isValidShareAlias(ok)).toBe(true);
+  });
+});

apps/server/src/core/share/share-alias.util.ts

@@ -0,0 +1,30 @@
+/**
+ * Vanity share-alias helpers shared by the write path (set/availability) and the
+ * `/l/:alias` resolve path. Aliases are ASCII-only, lowercase, hyphen-separated
+ * slugs — deliberately no Cyrillic / transliteration: the user types the exact
+ * canonical form. Keep this in sync with the client copy in
+ * `apps/client/src/features/share/share-alias.util.ts`.
+ */
+
+// Normalize a user-provided vanity alias into canonical ASCII storage form.
+// This only canonicalizes shape (case, separators); it does NOT enforce the
+// charset — call isValidShareAlias afterwards to reject anything illegal.
+export function normalizeShareAlias(raw: string): string {
+  return (raw ?? '')
+    .trim()
+    .toLowerCase()
+    .replace(/[\s_]+/g, '-') // spaces/underscores -> single hyphen
+    .replace(/-{2,}/g, '-') // collapse repeated hyphens
+    .replace(/^-+|-+$/g, ''); // trim leading/trailing hyphens
+}
+
+// ASCII only: lowercase letters/digits in hyphen-separated groups, length 2..60.
+const ALIAS_RE = /^[a-z0-9]+(?:-[a-z0-9]+)*$/;
+export function isValidShareAlias(alias: string): boolean {
+  return (
+    typeof alias === 'string' &&
+    alias.length >= 2 &&
+    alias.length <= 60 &&
+    ALIAS_RE.test(alias)
+  );
+}

apps/server/src/core/share/share.module.ts

@@ -5,13 +5,22 @@ import { TokenModule } from '../auth/token.module';
 import { ShareSeoController } from './share-seo.controller';
 import { TransclusionModule } from '../page/transclusion/transclusion.module';
 import { AiModule } from '../../integrations/ai/ai.module';
+import { ShareAliasService } from './share-alias.service';
+import { ShareAliasController } from './share-alias.controller';
+import { ShareAliasRedirectController } from './share-alias-redirect.controller';
 
 @Module({
   // AiModule (AiSettingsService) is used by the page-info route to surface
   // whether the anonymous public-share assistant is enabled for the workspace.
   imports: [TokenModule, TransclusionModule, AiModule],
-  controllers: [ShareController, ShareSeoController],
-  providers: [ShareService],
-  exports: [ShareService],
+  controllers: [
+    ShareController,
+    ShareSeoController,
+    // Vanity /l/:alias: authenticated management + public 302 resolver.
+    ShareAliasController,
+    ShareAliasRedirectController,
+  ],
+  providers: [ShareService, ShareAliasService],
+  exports: [ShareService, ShareAliasService],
 })
 export class ShareModule {}

apps/server/src/database/database.module.ts

@@ -23,6 +23,7 @@ import { UserTokenRepo } from './repos/user-token/user-token.repo';
 import { UserSessionRepo } from '@docmost/db/repos/session/user-session.repo';
 import { BacklinkRepo } from '@docmost/db/repos/backlink/backlink.repo';
 import { ShareRepo } from '@docmost/db/repos/share/share.repo';
+import { ShareAliasRepo } from '@docmost/db/repos/share-alias/share-alias.repo';
 import { NotificationRepo } from '@docmost/db/repos/notification/notification.repo';
 import { WatcherRepo } from '@docmost/db/repos/watcher/watcher.repo';
 import { LabelRepo } from '@docmost/db/repos/label/label.repo';
@@ -96,6 +97,7 @@ import { normalizePostgresUrl } from '../common/helpers';
     UserSessionRepo,
     BacklinkRepo,
     ShareRepo,
+    ShareAliasRepo,
     NotificationRepo,
     WatcherRepo,
     LabelRepo,
@@ -128,6 +130,7 @@ import { normalizePostgresUrl } from '../common/helpers';
     UserSessionRepo,
     BacklinkRepo,
     ShareRepo,
+    ShareAliasRepo,
     NotificationRepo,
     WatcherRepo,
     LabelRepo,

apps/server/src/database/migrations/20260626T130000-share-aliases.ts

@@ -0,0 +1,54 @@
+import { type Kysely, sql } from 'kysely';
+
+/**
+ * Vanity share aliases: a retargetable, human-readable pointer (`/l/<alias>`)
+ * that lives independently of any single `shares` row. The alias belongs to the
+ * WORKSPACE (stable address), and `page_id` is nullable with ON DELETE SET NULL
+ * so the address survives deletion of its current target (it 404s until
+ * retargeted) rather than disappearing with the page.
+ */
+export async function up(db: Kysely<any>): Promise<void> {
+  await db.schema
+    .createTable('share_aliases')
+    .addColumn('id', 'uuid', (col) =>
+      col.primaryKey().defaultTo(sql`gen_uuid_v7()`),
+    )
+    .addColumn('workspace_id', 'uuid', (col) =>
+      col.references('workspaces.id').onDelete('cascade').notNull(),
+    )
+    // Normalized ASCII, lowercase. Uniqueness is enforced per-workspace below.
+    .addColumn('alias', 'varchar', (col) => col.notNull())
+    // Nullable + SET NULL: the address outlives its target page.
+    .addColumn('page_id', 'uuid', (col) =>
+      col.references('pages.id').onDelete('set null'),
+    )
+    .addColumn('creator_id', 'uuid', (col) =>
+      col.references('users.id').onDelete('set null'),
+    )
+    .addColumn('created_at', 'timestamptz', (col) =>
+      col.notNull().defaultTo(sql`now()`),
+    )
+    .addColumn('updated_at', 'timestamptz', (col) =>
+      col.notNull().defaultTo(sql`now()`),
+    )
+    .execute();
+
+  // The vanity name is unique within a workspace (mirrors shares.key scoping).
+  await db.schema
+    .createIndex('share_aliases_workspace_id_alias_unique')
+    .on('share_aliases')
+    .columns(['workspace_id', 'alias'])
+    .unique()
+    .execute();
+
+  // "Which alias targets this page?" lookup for the share modal.
+  await db.schema
+    .createIndex('share_aliases_page_id_idx')
+    .on('share_aliases')
+    .column('page_id')
+    .execute();
+}
+
+export async function down(db: Kysely<any>): Promise<void> {
+  await db.schema.dropTable('share_aliases').execute();
+}

apps/server/src/database/repos/share-alias/share-alias.repo.spec.ts

@@ -0,0 +1,120 @@
+import { ShareAliasRepo } from './share-alias.repo';
+import type { KyselyDB } from '../../types/kysely.types';
+
+/**
+ * SQL-shape unit tests for ShareAliasRepo. A live Postgres is out of scope;
+ * instead we spy on the Kysely builder to assert each method pins the
+ * workspace scope (so a name in one workspace can never resolve another's
+ * page) and threads the right columns.
+ */
+describe('ShareAliasRepo', () => {
+  function makeSelectRepo(result: unknown) {
+    const where = jest.fn();
+    const builder: any = {
+      select: jest.fn(() => builder),
+      where: jest.fn((...args: unknown[]) => {
+        where(...args);
+        return builder;
+      }),
+      executeTakeFirst: jest.fn().mockResolvedValue(result),
+    };
+    const db = { selectFrom: jest.fn(() => builder) } as unknown as KyselyDB;
+    return { repo: new ShareAliasRepo(db), db, where, builder };
+  }
+
+  it('findByAliasAndWorkspace scopes by alias AND workspace', async () => {
+    const row = { id: 'a-1', alias: 'foo', workspaceId: 'ws-1' };
+    const { repo, db, where } = makeSelectRepo(row);
+
+    const res = await repo.findByAliasAndWorkspace('foo', 'ws-1');
+
+    expect(res).toBe(row);
+    expect(db.selectFrom).toHaveBeenCalledWith('shareAliases');
+    expect(where).toHaveBeenCalledWith('alias', '=', 'foo');
+    expect(where).toHaveBeenCalledWith('workspaceId', '=', 'ws-1');
+  });
+
+  it('findByPageId scopes by page AND workspace', async () => {
+    const { repo, where } = makeSelectRepo(undefined);
+    await repo.findByPageId('p-1', 'ws-1');
+    expect(where).toHaveBeenCalledWith('pageId', '=', 'p-1');
+    expect(where).toHaveBeenCalledWith('workspaceId', '=', 'ws-1');
+  });
+
+  it('insert writes the provided columns and returns the row', async () => {
+    const values = jest.fn();
+    const inserted = { id: 'a-1' };
+    const builder: any = {
+      values: jest.fn((v: unknown) => {
+        values(v);
+        return builder;
+      }),
+      returning: jest.fn(() => builder),
+      executeTakeFirst: jest.fn().mockResolvedValue(inserted),
+    };
+    const db = { insertInto: jest.fn(() => builder) } as unknown as KyselyDB;
+    const repo = new ShareAliasRepo(db);
+
+    const res = await repo.insert({
+      workspaceId: 'ws-1',
+      alias: 'foo',
+      pageId: 'p-1',
+      creatorId: 'u-1',
+    });
+
+    expect(db.insertInto).toHaveBeenCalledWith('shareAliases');
+    expect(values).toHaveBeenCalledWith({
+      workspaceId: 'ws-1',
+      alias: 'foo',
+      pageId: 'p-1',
+      creatorId: 'u-1',
+    });
+    expect(res).toBe(inserted);
+  });
+
+  it('updatePageId retargets a single row scoped by id + workspace', async () => {
+    const set = jest.fn();
+    const where = jest.fn();
+    const builder: any = {
+      set: jest.fn((s: unknown) => {
+        set(s);
+        return builder;
+      }),
+      where: jest.fn((...args: unknown[]) => {
+        where(...args);
+        return builder;
+      }),
+      returning: jest.fn(() => builder),
+      executeTakeFirst: jest.fn().mockResolvedValue({ id: 'a-1' }),
+    };
+    const db = { updateTable: jest.fn(() => builder) } as unknown as KyselyDB;
+    const repo = new ShareAliasRepo(db);
+
+    await repo.updatePageId('a-1', 'p-2', 'ws-1');
+
+    expect(db.updateTable).toHaveBeenCalledWith('shareAliases');
+    expect(set.mock.calls[0][0].pageId).toBe('p-2');
+    expect(set.mock.calls[0][0].updatedAt).toBeInstanceOf(Date);
+    expect(where).toHaveBeenCalledWith('id', '=', 'a-1');
+    expect(where).toHaveBeenCalledWith('workspaceId', '=', 'ws-1');
+  });
+
+  it('delete scopes by id + workspace', async () => {
+    const where = jest.fn();
+    const builder: any = {
+      where: jest.fn((...args: unknown[]) => {
+        where(...args);
+        return builder;
+      }),
+      execute: jest.fn().mockResolvedValue(undefined),
+    };
+    const db = { deleteFrom: jest.fn(() => builder) } as unknown as KyselyDB;
+    const repo = new ShareAliasRepo(db);
+
+    await repo.delete('a-1', 'ws-1');
+
+    expect(db.deleteFrom).toHaveBeenCalledWith('shareAliases');
+    expect(where).toHaveBeenCalledWith('id', '=', 'a-1');
+    expect(where).toHaveBeenCalledWith('workspaceId', '=', 'ws-1');
+  });
+});

apps/server/src/database/repos/share-alias/share-alias.repo.ts

@@ -0,0 +1,109 @@
+import { Injectable } from '@nestjs/common';
+import { InjectKysely } from 'nestjs-kysely';
+import { KyselyDB, KyselyTransaction } from '../../types/kysely.types';
+import { dbOrTx } from '../../utils';
+import {
+  InsertableShareAlias,
+  ShareAlias,
+} from '@docmost/db/types/entity.types';
+
+/**
+ * Repository for vanity share aliases (`/l/:alias`). An alias is a long-lived,
+ * workspace-scoped pointer to a page; retargeting is a single UPDATE of
+ * `page_id`. All lookups are workspace-scoped so a name in one workspace can
+ * never resolve a page in another.
+ */
+@Injectable()
+export class ShareAliasRepo {
+  constructor(@InjectKysely() private readonly db: KyselyDB) {}
+
+  private baseFields: Array<keyof ShareAlias> = [
+    'id',
+    'workspaceId',
+    'alias',
+    'pageId',
+    'creatorId',
+    'createdAt',
+    'updatedAt',
+  ];
+
+  /** Resolve a (normalized) alias within a workspace, or undefined. */
+  async findByAliasAndWorkspace(
+    alias: string,
+    workspaceId: string,
+    trx?: KyselyTransaction,
+  ): Promise<ShareAlias | undefined> {
+    return dbOrTx(this.db, trx)
+      .selectFrom('shareAliases')
+      .select(this.baseFields)
+      .where('alias', '=', alias)
+      .where('workspaceId', '=', workspaceId)
+      .executeTakeFirst();
+  }
+
+  /** The alias currently pointing at a page (for the share modal). */
+  async findByPageId(
+    pageId: string,
+    workspaceId: string,
+    trx?: KyselyTransaction,
+  ): Promise<ShareAlias | undefined> {
+    return dbOrTx(this.db, trx)
+      .selectFrom('shareAliases')
+      .select(this.baseFields)
+      .where('pageId', '=', pageId)
+      .where('workspaceId', '=', workspaceId)
+      .executeTakeFirst();
+  }
+
+  async findById(
+    id: string,
+    workspaceId: string,
+    trx?: KyselyTransaction,
+  ): Promise<ShareAlias | undefined> {
+    return dbOrTx(this.db, trx)
+      .selectFrom('shareAliases')
+      .select(this.baseFields)
+      .where('id', '=', id)
+      .where('workspaceId', '=', workspaceId)
+      .executeTakeFirst();
+  }
+
+  async insert(
+    insertable: InsertableShareAlias,
+    trx?: KyselyTransaction,
+  ): Promise<ShareAlias> {
+    return dbOrTx(this.db, trx)
+      .insertInto('shareAliases')
+      .values(insertable)
+      .returning(this.baseFields)
+      .executeTakeFirst();
+  }
+
+  /** Retarget an existing alias to a new page (the "swap" operation). */
+  async updatePageId(
+    id: string,
+    pageId: string,
+    workspaceId: string,
+    trx?: KyselyTransaction,
+  ): Promise<ShareAlias> {
+    return dbOrTx(this.db, trx)
+      .updateTable('shareAliases')
+      .set({ pageId, updatedAt: new Date() })
+      .where('id', '=', id)
+      .where('workspaceId', '=', workspaceId)
+      .returning(this.baseFields)
+      .executeTakeFirst();
+  }
+
+  async delete(
+    id: string,
+    workspaceId: string,
+    trx?: KyselyTransaction,
+  ): Promise<void> {
+    await dbOrTx(this.db, trx)
+      .deleteFrom('shareAliases')
+      .where('id', '=', id)
+      .where('workspaceId', '=', workspaceId)
+      .execute();
+  }
+}

apps/server/src/database/share-aliases.migration.spec.ts

@@ -0,0 +1,94 @@
+import * as migration from './migrations/20260626T130000-share-aliases';
+import type {
+  InsertableShareAlias,
+  ShareAlias,
+  UpdatableShareAlias,
+} from './types/entity.types';
+
+/**
+ * Sanity checks for the share_aliases migration + entity types. We don't run a
+ * live Postgres here (that's the integration suite); instead we assert the
+ * migration exposes the expected up/down contract and creates the table with
+ * the unique (workspace_id, alias) constraint and the page_id index, and that
+ * the generated entity types line up with the column set.
+ */
+describe('share-aliases migration', () => {
+  it('up creates the table, the unique index and the page_id index', async () => {
+    const calls: string[] = [];
+
+    const tableBuilder: any = new Proxy(
+      {},
+      {
+        get(_t, prop: string) {
+          if (prop === 'execute') return async () => undefined;
+          // addColumn/addConstraint/etc. are chainable no-ops.
+          return () => tableBuilder;
+        },
+      },
+    );
+
+    const indexBuilder: any = new Proxy(
+      {},
+      {
+        get(_t, prop: string) {
+          if (prop === 'execute') return async () => undefined;
+          return () => indexBuilder;
+        },
+      },
+    );
+
+    const schema = {
+      createTable: (name: string) => {
+        calls.push(`createTable:${name}`);
+        return tableBuilder;
+      },
+      createIndex: (name: string) => {
+        calls.push(`createIndex:${name}`);
+        return indexBuilder;
+      },
+    };
+
+    await migration.up({ schema } as any);
+
+    expect(calls).toContain('createTable:share_aliases');
+    expect(calls).toContain(
+      'createIndex:share_aliases_workspace_id_alias_unique',
+    );
+    expect(calls).toContain('createIndex:share_aliases_page_id_idx');
+  });
+
+  it('down drops the table', async () => {
+    const calls: string[] = [];
+    const dropBuilder: any = { execute: async () => undefined };
+    const schema = {
+      dropTable: (name: string) => {
+        calls.push(`dropTable:${name}`);
+        return dropBuilder;
+      },
+    };
+    await migration.down({ schema } as any);
+    expect(calls).toContain('dropTable:share_aliases');
+  });
+
+  it('entity types expose the alias columns', () => {
+    // Compile-time only: these typed declarations fail `tsc` if the entity types
+    // drift (missing/renamed columns, wrong nullability). The runtime assertions
+    // would be tautological, so the value is purely in the type-check.
+    const row: ShareAlias = {
+      id: 'a-1',
+      workspaceId: 'ws-1',
+      alias: 'foo',
+      pageId: 'p-1',
+      creatorId: 'u-1',
+      createdAt: new Date(),
+      updatedAt: new Date(),
+    };
+    const insert: InsertableShareAlias = {
+      workspaceId: 'ws-1',
+      alias: 'foo',
+    };
+    const update: UpdatableShareAlias = { pageId: null };
+
+    expect([row, insert, update]).toHaveLength(3);
+  });
+});

apps/server/src/database/types/db.d.ts

@@ -305,6 +305,16 @@ export interface Pages {
   ydoc: Buffer | null;
 }
 
+export interface ShareAliases {
+  alias: string;
+  createdAt: Generated<Timestamp>;
+  creatorId: string | null;
+  id: Generated<string>;
+  pageId: string | null;
+  updatedAt: Generated<Timestamp>;
+  workspaceId: string;
+}
+
 export interface Shares {
   createdAt: Generated<Timestamp>;
   creatorId: string | null;
@@ -674,6 +684,7 @@ export interface DB {
   pageVerifiers: PageVerifiers;
   pages: Pages;
   scimTokens: ScimTokens;
+  shareAliases: ShareAliases;
   shares: Shares;
   spaceMembers: SpaceMembers;
   spaces: Spaces;

apps/server/src/database/types/entity.types.ts

@@ -30,6 +30,7 @@ import {
   AuthProviders,
   AuthAccounts,
   Shares,
+  ShareAliases,
   Favorites,
   FileTasks,
   UserMfa as _UserMFA,
@@ -172,6 +173,11 @@ export type Share = Selectable<Shares>;
 export type InsertableShare = Insertable<Shares>;
 export type UpdatableShare = Updateable<Omit<Shares, 'id'>>;
 
+// Share alias (vanity /l/:alias pointer)
+export type ShareAlias = Selectable<ShareAliases>;
+export type InsertableShareAlias = Insertable<ShareAliases>;
+export type UpdatableShareAlias = Updateable<Omit<ShareAliases, 'id'>>;
+
 // Favorite
 export type Favorite = Selectable<Favorites>;
 export type InsertableFavorite = Insertable<Favorites>;

apps/server/src/main.ts

@@ -40,7 +40,14 @@ async function bootstrap() {
   app.useLogger(app.get(PinoLogger));
 
   app.setGlobalPrefix('api', {
-    exclude: ['robots.txt', 'share/:shareId/p/:pageSlug', 'mcp'],
+    exclude: [
+      'robots.txt',
+      'share/:shareId/p/:pageSlug',
+      // Vanity link resolver lives outside /api so /l/<alias> is a clean
+      // public URL that 302s to the canonical share page.
+      'l/:alias',
+      'mcp',
+    ],
   });
 
   const reflector = app.get(Reflector);

apps/server/test/jest-e2e.json

@@ -4,7 +4,7 @@
   "testEnvironment": "node",
   "testRegex": ".e2e-spec.ts$",
   "transform": {
-    "^.+\\.(t|j)sx?$": "ts-jest"
+    "^.+\\.(t|j)sx?$": ["ts-jest", { "tsconfig": { "allowJs": true } }]
   },
   "transformIgnorePatterns": [
     "/node_modules/(?!(\\.pnpm/)?(nanoid|uuid|image-dimensions|marked|happy-dom|lib0|@sindresorhus[+/][a-z0-9-]+|escape-string-regexp|p-limit|yocto-queue)(@|/))"