diff --git a/admin-web/src/api/client.ts b/admin-web/src/api/client.ts
index f74442c..ad72afd 100644
--- a/admin-web/src/api/client.ts
+++ b/admin-web/src/api/client.ts
@@ -3,6 +3,7 @@ import type {
   AdminOperatorCreateRequest,
   AdminOperatorProvisioning,
   AdminSecuritySummary,
+  AdminHintPack,
   AdminLoginResponse,
   AuditQuery,
   AuditLogEntry,
@@ -14,12 +15,17 @@ import type {
   Overview,
   PageResult,
   ProductAnalyticsOverview,
+  CreateOfficialSkillRequest,
+  OfficialSkill,
+  OfficialSkillCatalog,
   ReferralsQuery,
   ReferralOverview,
   SessionResponse,
   UserDetail,
   UsersQuery,
   UserSummary,
+  UpdateHintPackRequest,
+  UpdateOfficialSkillRequest,
 } from "./types";
 
 const API_BASE = "/v1/admin";
@@ -73,6 +79,9 @@ function safeMessage(status: number, code?: string): string {
     ADMIN_USERNAME_CONFLICT: "该管理员用户名已存在",
     CANNOT_DISABLE_SELF: "不能停用当前登录的管理员",
     LAST_SUPER_ADMIN_REQUIRED: "必须至少保留一名启用的超级管理员",
+    CONTENT_SKILL_NOT_FOUND: "未找到该官方 Skill",
+    CONTENT_SKILL_CONFLICT: "该官方 Skill ID 已存在",
+    CONTENT_HINT_PACK_NOT_FOUND: "该语言的 Hint pack 尚未发布",
     RATE_LIMITED: "操作过于频繁，请稍后再试",
   };
   if (code && messages[code]) return messages[code];
@@ -187,6 +196,38 @@ export const adminApi = {
   productAnalytics: (range: string) =>
     request<ProductAnalyticsOverview>(`/analytics${encodeQuery({ range })}`),
 
+  contentSkills: () => request<OfficialSkillCatalog>("/content/skills"),
+
+  createContentSkill: (payload: CreateOfficialSkillRequest) =>
+    request<OfficialSkill>("/content/skills", {
+      method: "POST",
+      body: JSON.stringify(payload),
+    }),
+
+  updateContentSkill: (id: string, payload: UpdateOfficialSkillRequest) =>
+    request<OfficialSkill>(`/content/skills/${encodeURIComponent(id)}`, {
+      method: "PUT",
+      body: JSON.stringify(payload),
+    }),
+
+  setContentSkillEnabled: (id: string, enabled: boolean) =>
+    request<void>(
+      `/content/skills/${encodeURIComponent(id)}/${enabled ? "enable" : "disable"}`,
+      { method: "POST" },
+    ),
+
+  contentHintPack: (locale: "zh" | "en") =>
+    request<AdminHintPack>(`/content/hints/${locale}`),
+
+  updateContentHintPack: (
+    locale: "zh" | "en",
+    payload: UpdateHintPackRequest,
+  ) =>
+    request<AdminHintPack>(`/content/hints/${locale}`, {
+      method: "PUT",
+      body: JSON.stringify(payload),
+    }),
+
   users: (value: string | UsersQuery = "", legacyCursor?: string) => {
     const params =
       typeof value === "string"
diff --git a/admin-web/src/api/types.ts b/admin-web/src/api/types.ts
index f406377..f53b193 100644
--- a/admin-web/src/api/types.ts
+++ b/admin-web/src/api/types.ts
@@ -11,7 +11,76 @@ export type AdminAuditAction =
   | "OPERATOR_UNLOCKED"
   | "OPERATOR_CREDENTIALS_RESET"
   | "OPERATOR_SESSIONS_REVOKED"
-  | "MANUAL_CREDIT_GRANTED";
+  | "MANUAL_CREDIT_GRANTED"
+  | "CONTENT_SKILL_CREATED"
+  | "CONTENT_SKILL_UPDATED"
+  | "CONTENT_SKILL_ENABLED"
+  | "CONTENT_SKILL_DISABLED"
+  | "CONTENT_HINT_PACK_PUBLISHED";
+
+export interface SkillLocalization {
+  name: string;
+  summary: string;
+  prompt: string;
+}
+
+export interface OfficialSkill {
+  id: string;
+  systemImage: string;
+  sortOrder: number;
+  kind: "transform";
+  thinkingEnabled: boolean;
+  enabled: boolean;
+  localizations: {
+    "zh-Hans": SkillLocalization;
+    en: SkillLocalization;
+  };
+}
+
+export interface OfficialSkillCatalog {
+  revision: number;
+  generatedAt?: string;
+  skills: OfficialSkill[];
+}
+
+export type CreateOfficialSkillRequest = Omit<
+  OfficialSkill,
+  "kind" | "enabled"
+>;
+
+export type UpdateOfficialSkillRequest = Omit<
+  CreateOfficialSkillRequest,
+  "id"
+>;
+
+export interface AIHintCard {
+  id: string;
+  displayText?: string;
+  text?: string;
+  prompt: string;
+  category: string;
+  priority: number;
+  source: string;
+  locale: "zh" | "en";
+  conditions: string[];
+  metadata?: Record<string, unknown>;
+}
+
+export interface AdminHintPack {
+  locale: "zh" | "en";
+  generatedAt?: string;
+  expiresAt?: string;
+  intervalHours?: number;
+  version: number;
+  cards: AIHintCard[];
+}
+
+export interface UpdateHintPackRequest {
+  generatedAt?: string;
+  expiresAt?: string;
+  intervalHours?: number;
+  cards: AIHintCard[];
+}
 
 export interface CursorPageQuery {
   cursor?: string;
@@ -176,6 +245,25 @@ export interface ProductAnalyticsOverview {
   growthFunnel: FunnelStep[];
   retention: AnalyticsCohort[];
   aiFeatures: AnalyticsFeatureUsage[];
+  keyboardUsage: {
+    activeUsers: number;
+    activationToInput: AnalyticsRate;
+    chineseActiveUsers: number;
+    englishActiveUsers: number;
+    bilingualActiveUsers: number;
+    totalCharacters: number;
+    chineseCharacters: number;
+    englishCharacters: number;
+    otherCharacters: number;
+    chineseSharePercent?: number;
+    englishSharePercent?: number;
+    inputSessions: number;
+    averageCharactersPerInputSession?: number;
+    chineseOnlySessions: number;
+    englishOnlySessions: number;
+    mixedLanguageSessions: number;
+    otherOnlySessions: number;
+  };
   referralFunnel: FunnelStep[];
   guardrails: {
     clientAiSuccessRate: AnalyticsRate;
diff --git a/admin-web/src/app.tsx b/admin-web/src/app.tsx
index 1915b5c..a38bf8e 100644
--- a/admin-web/src/app.tsx
+++ b/admin-web/src/app.tsx
@@ -5,6 +5,7 @@ import {
   ChevronRight,
   Coins,
   GitBranch,
+  LibraryBig,
   LogOut,
   Menu,
   Moon,
@@ -65,6 +66,11 @@ const CreditsPage = lazy(() =>
     default: module.CreditsPage,
   })),
 );
+const ContentPage = lazy(() =>
+  import("./features/content/content-page").then((module) => ({
+    default: module.ContentPage,
+  })),
+);
 const AuditPage = lazy(() =>
   import("./features/audit/audit-page").then((module) => ({
     default: module.AuditPage,
@@ -123,6 +129,13 @@ const navigation: NavItem[] = [
     icon: Coins,
     roles: supportRoles,
   },
+  {
+    path: "/content",
+    label: "内容管理",
+    description: "Skill 与 Hint",
+    icon: LibraryBig,
+    roles: supportRoles,
+  },
   {
     path: "/audit",
     label: "审计日志",
@@ -204,6 +217,7 @@ function AuthenticatedApp({ role }: { role: AdminRole }) {
               <>
                 <Route path="/users" element={<UsersPage />} />
                 <Route path="/credits" element={<CreditsPage />} />
+                <Route path="/content" element={<ContentPage />} />
               </>
             ) : null}
             {role === "SUPER_ADMIN" ? (
diff --git a/admin-web/src/features/analytics/analytics-page.tsx b/admin-web/src/features/analytics/analytics-page.tsx
index b9c88d6..026fc6f 100644
--- a/admin-web/src/features/analytics/analytics-page.tsx
+++ b/admin-web/src/features/analytics/analytics-page.tsx
@@ -4,6 +4,7 @@ import {
   BrainCircuit,
   ChartNoAxesCombined,
   Gauge,
+  Keyboard,
   Repeat2,
   Sparkles,
   Target,
@@ -264,6 +265,74 @@ export function AnalyticsPage() {
         </Card>
       </section>
 
+      <section className="grid gap-6 xl:grid-cols-2" aria-label="键盘输入统计">
+        <Card className="overflow-hidden">
+          <SectionHeader
+            title="键盘中英文输入"
+            description="仅统计 OSGKeyboard 本地聚合后的手动提交字符，不包含输入内容"
+            icon={Keyboard}
+          />
+          <ComparisonBarChart
+            items={[
+              {
+                label: "中文",
+                value: data.keyboardUsage.chineseCharacters,
+                hint: `占中英文 ${optionalPercent(data.keyboardUsage.chineseSharePercent)}`,
+              },
+              {
+                label: "英文",
+                value: data.keyboardUsage.englishCharacters,
+                hint: `占中英文 ${optionalPercent(data.keyboardUsage.englishSharePercent)}`,
+              },
+              {
+                label: "其他",
+                value: data.keyboardUsage.otherCharacters,
+                hint: "数字、标点与 Emoji",
+              },
+            ]}
+            primaryLabel="提交字符数"
+            primaryTone="primary"
+          />
+          <MetricRows
+            rows={[
+              ["输入活跃用户", formatNumber(data.keyboardUsage.activeUsers)],
+              ["激活到输入转化", rateLabel(data.keyboardUsage.activationToInput)],
+              ["中文活跃用户", formatNumber(data.keyboardUsage.chineseActiveUsers)],
+              ["英文活跃用户", formatNumber(data.keyboardUsage.englishActiveUsers)],
+              ["中英双语用户", formatNumber(data.keyboardUsage.bilingualActiveUsers)],
+              ["总提交字符", formatNumber(data.keyboardUsage.totalCharacters)],
+            ]}
+          />
+        </Card>
+
+        <Card className="overflow-hidden">
+          <SectionHeader
+            title="输入会话结构"
+            description="一次键盘激活期间至少提交一个字符才计为输入会话"
+            icon={Activity}
+          />
+          <ComparisonBarChart
+            items={[
+              { label: "仅中文", value: data.keyboardUsage.chineseOnlySessions },
+              { label: "仅英文", value: data.keyboardUsage.englishOnlySessions },
+              { label: "中英混合", value: data.keyboardUsage.mixedLanguageSessions },
+              { label: "仅其他", value: data.keyboardUsage.otherOnlySessions },
+            ]}
+            primaryLabel="输入会话"
+            primaryTone="success"
+          />
+          <MetricRows
+            rows={[
+              ["输入会话总数", formatNumber(data.keyboardUsage.inputSessions)],
+              [
+                "平均每会话字符",
+                optionalDecimal(data.keyboardUsage.averageCharactersPerInputSession),
+              ],
+            ]}
+          />
+        </Card>
+      </section>
+
       <section className="grid gap-6 xl:grid-cols-3">
         <Card className="overflow-hidden">
           <SectionHeader title="付费转化" description="StoreKit 已验证交易" icon={BadgeDollarSign} />
diff --git a/admin-web/src/features/content/content-page.tsx b/admin-web/src/features/content/content-page.tsx
new file mode 100644
index 0000000..c78e017
--- /dev/null
+++ b/admin-web/src/features/content/content-page.tsx
@@ -0,0 +1,507 @@
+import { FileJson, Pencil, Plus, Power, RefreshCw, Sparkles } from "lucide-react";
+import {
+  useCallback,
+  useEffect,
+  useState,
+  type FormEvent,
+  type ReactNode,
+} from "react";
+import { toast } from "sonner";
+import { adminApi, ApiError } from "../../api/client";
+import type {
+  AdminHintPack,
+  CreateOfficialSkillRequest,
+  OfficialSkill,
+  OfficialSkillCatalog,
+  SkillLocalization,
+  UpdateHintPackRequest,
+} from "../../api/types";
+import {
+  Badge,
+  Button,
+  Card,
+  Dialog,
+  EmptyState,
+  ErrorState,
+  Input,
+  LoadingState,
+  PageHeader,
+  Textarea,
+} from "../../components/primitives";
+import { useAuth } from "../auth/auth-context";
+
+type HintLocale = "zh" | "en";
+
+export function ContentPage() {
+  const { auth } = useAuth();
+  const canEdit = auth.status === "authenticated" && auth.role === "SUPER_ADMIN";
+  const [catalog, setCatalog] = useState<OfficialSkillCatalog>();
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<unknown>();
+  const [editingSkill, setEditingSkill] = useState<OfficialSkill | "new">();
+  const [busySkillId, setBusySkillId] = useState<string>();
+  const [locale, setLocale] = useState<HintLocale>("zh");
+  const [hintText, setHintText] = useState("");
+  const [hintVersion, setHintVersion] = useState(0);
+  const [hintLoading, setHintLoading] = useState(true);
+  const [hintSaving, setHintSaving] = useState(false);
+
+  const loadSkills = useCallback(async () => {
+    setError(undefined);
+    try {
+      setCatalog(await adminApi.contentSkills());
+    } catch (requestError) {
+      setError(requestError);
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  const loadHint = useCallback(async (nextLocale: HintLocale) => {
+    setHintLoading(true);
+    try {
+      const pack = await adminApi.contentHintPack(nextLocale);
+      setHintVersion(pack.version);
+      setHintText(formatHintPack(pack));
+    } catch (requestError) {
+      toast.error(errorMessage(requestError, "Hint pack 加载失败"));
+    } finally {
+      setHintLoading(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    void loadSkills();
+  }, [loadSkills]);
+
+  useEffect(() => {
+    void loadHint(locale);
+  }, [loadHint, locale]);
+
+  async function setSkillEnabled(skill: OfficialSkill) {
+    setBusySkillId(skill.id);
+    try {
+      await adminApi.setContentSkillEnabled(skill.id, !skill.enabled);
+      toast.success(skill.enabled ? "Skill 已停用" : "Skill 已启用");
+      await loadSkills();
+    } catch (requestError) {
+      toast.error(errorMessage(requestError, "Skill 状态更新失败"));
+    } finally {
+      setBusySkillId(undefined);
+    }
+  }
+
+  async function saveHint() {
+    let payload: UpdateHintPackRequest;
+    try {
+      const parsed = JSON.parse(hintText) as Partial<UpdateHintPackRequest>;
+      if (!Array.isArray(parsed.cards)) throw new Error("cards 必须是数组");
+      payload = {
+        generatedAt: optionalString(parsed.generatedAt),
+        expiresAt: optionalString(parsed.expiresAt),
+        intervalHours:
+          parsed.intervalHours === undefined ? undefined : Number(parsed.intervalHours),
+        cards: parsed.cards,
+      };
+    } catch (parseError) {
+      toast.error(parseError instanceof Error ? parseError.message : "JSON 格式无效");
+      return;
+    }
+    setHintSaving(true);
+    try {
+      const saved = await adminApi.updateContentHintPack(locale, payload);
+      setHintVersion(saved.version);
+      setHintText(formatHintPack(saved));
+      toast.success(`${locale} Hint pack 已发布`);
+    } catch (requestError) {
+      toast.error(errorMessage(requestError, "Hint pack 保存失败"));
+    } finally {
+      setHintSaving(false);
+    }
+  }
+
+  if (error) return <ErrorState error={error} retry={() => void loadSkills()} />;
+  if (loading || !catalog) return <LoadingState label="加载内容管理" />;
+
+  return (
+    <div className="space-y-8">
+      <PageHeader
+        eyebrow="Official Content"
+        title="内容管理"
+        description="维护客户端官方 Skill 目录与 zh/en AI Hint 发布包。每次保存都会立即发布并写入审计。"
+        actions={
+          canEdit ? (
+            <Button onClick={() => setEditingSkill("new")}>
+              <Plus className="size-4" aria-hidden />
+              新增 Skill
+            </Button>
+          ) : (
+            <Badge tone="info">只读访问</Badge>
+          )
+        }
+      />
+
+      <section aria-labelledby="skill-heading" className="space-y-4">
+        <div className="flex flex-wrap items-end justify-between gap-3">
+          <div>
+            <h2 id="skill-heading" className="text-xl font-bold">
+              官方 Skill
+            </h2>
+            <p className="mt-1 text-sm text-muted">
+              当前 revision {catalog.revision} · 共 {catalog.skills.length} 项
+            </p>
+          </div>
+          <Button variant="secondary" onClick={() => void loadSkills()}>
+            <RefreshCw className="size-4" aria-hidden />
+            刷新
+          </Button>
+        </div>
+
+        {catalog.skills.length === 0 ? (
+          <Card>
+            <EmptyState title="暂无官方 Skill" description="新增后可单独启用发布。" />
+          </Card>
+        ) : (
+          <div className="grid gap-4 xl:grid-cols-2">
+            {catalog.skills.map((skill) => (
+              <Card key={skill.id} className="p-5">
+                <div className="flex items-start gap-4">
+                  <span className="grid size-11 shrink-0 place-items-center rounded-2xl bg-primary-soft text-primary">
+                    <Sparkles className="size-5" aria-hidden />
+                  </span>
+                  <div className="min-w-0 flex-1">
+                    <div className="flex flex-wrap items-center gap-2">
+                      <h3 className="font-semibold">{skill.localizations["zh-Hans"].name}</h3>
+                      <Badge tone={skill.enabled ? "success" : "neutral"}>
+                        {skill.enabled ? "已启用" : "已停用"}
+                      </Badge>
+                      {skill.thinkingEnabled ? <Badge tone="violet">思考</Badge> : null}
+                    </div>
+                    <p className="mt-1 text-sm text-muted">
+                      {skill.localizations["zh-Hans"].summary}
+                    </p>
+                    <p className="mt-3 break-all font-mono text-[11px] text-muted">
+                      {skill.id} · {skill.systemImage} · 排序 {skill.sortOrder}
+                    </p>
+                    {canEdit ? (
+                      <div className="mt-4 flex flex-wrap gap-2">
+                        <Button
+                          size="sm"
+                          variant="secondary"
+                          onClick={() => setEditingSkill(skill)}
+                        >
+                          <Pencil className="size-3.5" aria-hidden />
+                          编辑
+                        </Button>
+                        <Button
+                          size="sm"
+                          variant={skill.enabled ? "danger" : "primary"}
+                          loading={busySkillId === skill.id}
+                          onClick={() => void setSkillEnabled(skill)}
+                        >
+                          <Power className="size-3.5" aria-hidden />
+                          {skill.enabled ? "停用" : "启用"}
+                        </Button>
+                      </div>
+                    ) : null}
+                  </div>
+                </div>
+              </Card>
+            ))}
+          </div>
+        )}
+      </section>
+
+      <section aria-labelledby="hint-heading" className="space-y-4">
+        <div>
+          <h2 id="hint-heading" className="text-xl font-bold">
+            AI Hint packs
+          </h2>
+          <p className="mt-1 text-sm text-muted">
+            JSON 必须符合 AIHintPack 卡片字段；服务端自动递增 version。
+          </p>
+        </div>
+        <Card className="overflow-hidden">
+          <div className="flex flex-wrap items-center gap-2 border-b border-border p-4">
+            {(["zh", "en"] as HintLocale[]).map((item) => (
+              <Button
+                key={item}
+                size="sm"
+                variant={locale === item ? "primary" : "secondary"}
+                onClick={() => setLocale(item)}
+                aria-pressed={locale === item}
+              >
+                {item}
+              </Button>
+            ))}
+            <Badge className="ml-auto" tone="info">
+              version {hintVersion}
+            </Badge>
+          </div>
+          <div className="p-4 sm:p-6">
+            {hintLoading ? (
+              <LoadingState label={`加载 ${locale} Hint pack`} />
+            ) : (
+              <>
+                <label className="block text-sm font-semibold" htmlFor="hint-pack-json">
+                  <span className="mb-2 flex items-center gap-2">
+                    <FileJson className="size-4 text-primary" aria-hidden />
+                    {locale} JSON
+                  </span>
+                  <Textarea
+                    id="hint-pack-json"
+                    className="min-h-[420px] font-mono text-xs leading-5"
+                    value={hintText}
+                    onChange={(event) => setHintText(event.target.value)}
+                    readOnly={!canEdit}
+                    spellCheck={false}
+                  />
+                </label>
+                {canEdit ? (
+                  <div className="mt-4 flex justify-end">
+                    <Button loading={hintSaving} onClick={() => void saveHint()}>
+                      保存并立即发布
+                    </Button>
+                  </div>
+                ) : null}
+              </>
+            )}
+          </div>
+        </Card>
+      </section>
+
+      <SkillDialog
+        skill={editingSkill}
+        onClose={() => setEditingSkill(undefined)}
+        onSaved={async () => {
+          setEditingSkill(undefined);
+          await loadSkills();
+        }}
+      />
+    </div>
+  );
+}
+
+function SkillDialog({
+  skill,
+  onClose,
+  onSaved,
+}: {
+  skill?: OfficialSkill | "new";
+  onClose: () => void;
+  onSaved: () => Promise<void>;
+}) {
+  const [form, setForm] = useState<CreateOfficialSkillRequest>(() => emptySkill());
+  const [saving, setSaving] = useState(false);
+
+  useEffect(() => {
+    setForm(skill && skill !== "new" ? skillToRequest(skill) : emptySkill());
+  }, [skill]);
+
+  async function submit(event: FormEvent) {
+    event.preventDefault();
+    setSaving(true);
+    try {
+      if (skill === "new") {
+        await adminApi.createContentSkill(form);
+      } else if (skill) {
+        const { id: _id, ...payload } = form;
+        await adminApi.updateContentSkill(skill.id, payload);
+      }
+      toast.success(skill === "new" ? "Skill 已创建（默认停用）" : "Skill 已更新");
+      await onSaved();
+    } catch (requestError) {
+      toast.error(errorMessage(requestError, "Skill 保存失败"));
+    } finally {
+      setSaving(false);
+    }
+  }
+
+  return (
+    <Dialog
+      open={Boolean(skill)}
+      onOpenChange={(open) => {
+        if (!open) onClose();
+      }}
+      title={skill === "new" ? "新增官方 Skill" : "编辑官方 Skill"}
+      description="ID 创建后不可修改；新 Skill 默认停用，确认内容后再启用。"
+      preventClose={saving}
+      className="max-w-3xl"
+    >
+      <form className="space-y-5" onSubmit={(event) => void submit(event)}>
+        <div className="grid gap-4 sm:grid-cols-2">
+          <Field label="Skill ID">
+            <Input
+              required
+              pattern={"official\\.[a-z0-9._-]+"}
+              minLength={10}
+              maxLength={100}
+              value={form.id}
+              disabled={skill !== "new"}
+              onChange={(event) => setForm({ ...form, id: event.target.value })}
+              placeholder="official.polish"
+            />
+          </Field>
+          <Field label="SF Symbol">
+            <Input
+              required
+              minLength={1}
+              maxLength={100}
+              value={form.systemImage}
+              onChange={(event) => setForm({ ...form, systemImage: event.target.value })}
+              placeholder="wand.and.sparkles"
+            />
+          </Field>
+          <Field label="排序">
+            <Input
+              required
+              type="number"
+              min={0}
+              max={100000}
+              value={form.sortOrder}
+              onChange={(event) =>
+                setForm({ ...form, sortOrder: Number(event.target.value) })
+              }
+            />
+          </Field>
+          <label className="flex min-h-11 items-center gap-3 self-end rounded-xl border border-border px-4 text-sm">
+            <input
+              type="checkbox"
+              checked={form.thinkingEnabled}
+              onChange={(event) =>
+                setForm({ ...form, thinkingEnabled: event.target.checked })
+              }
+            />
+            启用思考模式
+          </label>
+        </div>
+        <LocalizationFields
+          title="简体中文"
+          value={form.localizations["zh-Hans"]}
+          onChange={(value) =>
+            setForm({
+              ...form,
+              localizations: { ...form.localizations, "zh-Hans": value },
+            })
+          }
+        />
+        <LocalizationFields
+          title="English"
+          value={form.localizations.en}
+          onChange={(value) =>
+            setForm({
+              ...form,
+              localizations: { ...form.localizations, en: value },
+            })
+          }
+        />
+        <div className="flex justify-end gap-2">
+          <Button type="button" variant="secondary" onClick={onClose}>
+            取消
+          </Button>
+          <Button type="submit" loading={saving}>
+            保存
+          </Button>
+        </div>
+      </form>
+    </Dialog>
+  );
+}
+
+function LocalizationFields({
+  title,
+  value,
+  onChange,
+}: {
+  title: string;
+  value: SkillLocalization;
+  onChange: (value: SkillLocalization) => void;
+}) {
+  return (
+    <fieldset className="space-y-3 rounded-2xl border border-border p-4">
+      <legend className="px-2 text-sm font-semibold">{title}</legend>
+      <div className="grid gap-3 sm:grid-cols-2">
+        <Field label="名称">
+          <Input
+            required
+            minLength={1}
+            maxLength={40}
+            value={value.name}
+            onChange={(event) => onChange({ ...value, name: event.target.value })}
+          />
+        </Field>
+        <Field label="摘要">
+          <Input
+            required
+            minLength={1}
+            maxLength={200}
+            value={value.summary}
+            onChange={(event) => onChange({ ...value, summary: event.target.value })}
+          />
+        </Field>
+      </div>
+      <Field label="Prompt">
+        <Textarea
+          required
+          minLength={1}
+          maxLength={6000}
+          value={value.prompt}
+          onChange={(event) => onChange({ ...value, prompt: event.target.value })}
+        />
+      </Field>
+    </fieldset>
+  );
+}
+
+function Field({ label, children }: { label: string; children: ReactNode }) {
+  return (
+    <label className="block text-sm font-medium">
+      <span className="mb-1.5 block">{label}</span>
+      {children}
+    </label>
+  );
+}
+
+function emptySkill(): CreateOfficialSkillRequest {
+  return {
+    id: "official.",
+    systemImage: "sparkles",
+    sortOrder: 0,
+    thinkingEnabled: false,
+    localizations: {
+      "zh-Hans": { name: "", summary: "", prompt: "" },
+      en: { name: "", summary: "", prompt: "" },
+    },
+  };
+}
+
+function skillToRequest(skill: OfficialSkill): CreateOfficialSkillRequest {
+  return {
+    id: skill.id,
+    systemImage: skill.systemImage,
+    sortOrder: skill.sortOrder,
+    thinkingEnabled: skill.thinkingEnabled,
+    localizations: skill.localizations,
+  };
+}
+
+function formatHintPack(pack: AdminHintPack): string {
+  return JSON.stringify(
+    {
+      generatedAt: pack.generatedAt,
+      expiresAt: pack.expiresAt,
+      intervalHours: pack.intervalHours,
+      cards: pack.cards,
+    },
+    null,
+    2,
+  );
+}
+
+function optionalString(value: unknown): string | undefined {
+  return typeof value === "string" && value.trim() ? value.trim() : undefined;
+}
+
+function errorMessage(error: unknown, fallback: string): string {
+  return error instanceof ApiError ? error.message : fallback;
+}
diff --git a/admin-web/src/features/users/users-page.tsx b/admin-web/src/features/users/users-page.tsx
index 241a104..6790e48 100644
--- a/admin-web/src/features/users/users-page.tsx
+++ b/admin-web/src/features/users/users-page.tsx
@@ -250,7 +250,7 @@ function UserList({ onSelect }: { onSelect: (userId: string) => void }) {
             options={[
               { value: "", label: "全部状态" },
               { value: "active", label: "正常" },
-              { value: "suspended", label: "已暂停" },
+              { value: "suspended", label: "反滥用受限" },
             ]}
             onChange={setStatus}
           />
diff --git a/admin-web/src/lib/format.ts b/admin-web/src/lib/format.ts
index 3ae2ebc..a1d1935 100644
--- a/admin-web/src/lib/format.ts
+++ b/admin-web/src/lib/format.ts
@@ -35,7 +35,7 @@ export function escapeHtml(value: unknown): string {
 export function statusLabel(status: string): string {
   const labels: Record<string, string> = {
     active: "正常",
-    suspended: "已停用",
+    suspended: "反滥用受限",
     closed: "已关闭",
     success: "成功",
     rejected: "已拒绝",
diff --git a/admin-web/src/test/client.test.ts b/admin-web/src/test/client.test.ts
index 3b933f5..989473e 100644
--- a/admin-web/src/test/client.test.ts
+++ b/admin-web/src/test/client.test.ts
@@ -57,6 +57,23 @@ describe("adminApi", () => {
     expect(request.credentials).toBe("include");
   });
 
+  it("内容发布请求携带 CSRF 并编码 Skill ID", async () => {
+    const fetchMock = vi.fn().mockResolvedValue(
+      new Response(null, { status: 204 }),
+    );
+    vi.stubGlobal("fetch", fetchMock);
+    setCsrfToken("csrf-content");
+
+    await adminApi.setContentSkillEnabled("official.skill/with space", true);
+
+    expect(fetchMock.mock.calls[0]?.[0]).toBe(
+      "/v1/admin/content/skills/official.skill%2Fwith%20space/enable",
+    );
+    const request = fetchMock.mock.calls[0]?.[1] as RequestInit;
+    expect((request.headers as Headers).get("X-CSRF-Token")).toBe("csrf-content");
+    expect(request.method).toBe("POST");
+  });
+
   it("登录请求不依赖已有会话 CSRF", async () => {
     const fetchMock = vi.fn().mockResolvedValue(
       new Response(
diff --git a/admin-web/src/test/content.test.tsx b/admin-web/src/test/content.test.tsx
new file mode 100644
index 0000000..d96d6fb
--- /dev/null
+++ b/admin-web/src/test/content.test.tsx
@@ -0,0 +1,121 @@
+import { cleanup, render, screen, waitFor } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { adminApi } from "../api/client";
+import type { AdminRole, OfficialSkillCatalog } from "../api/types";
+import { App } from "../app";
+
+afterEach(() => {
+  cleanup();
+  vi.restoreAllMocks();
+  window.location.hash = "";
+});
+
+describe("内容管理", () => {
+  it("SUPPORT 可查看但不能修改 Skill 与 Hint", async () => {
+    mockSession("SUPPORT");
+    mockContent();
+    window.location.hash = "#/content";
+
+    render(<App />);
+
+    expect(await screen.findByRole("heading", { name: "内容管理" })).toBeTruthy();
+    expect(screen.getByRole("link", { name: /内容管理/ })).toBeTruthy();
+    expect(await screen.findByText("润色")).toBeTruthy();
+    expect(screen.getByText("只读访问")).toBeTruthy();
+    expect(screen.queryByRole("button", { name: "新增 Skill" })).toBeNull();
+    const editor = await screen.findByLabelText("zh JSON");
+    expect(editor).toHaveProperty("readOnly", true);
+    expect(screen.queryByRole("button", { name: "保存并立即发布" })).toBeNull();
+  });
+
+  it("SUPER_ADMIN 可启停官方 Skill", async () => {
+    mockSession("SUPER_ADMIN");
+    mockContent();
+    const mutation = vi
+      .spyOn(adminApi, "setContentSkillEnabled")
+      .mockResolvedValue(undefined);
+    window.location.hash = "#/content";
+
+    render(<App />);
+
+    await userEvent.click(await screen.findByRole("button", { name: "停用" }));
+
+    await waitFor(() => {
+      expect(mutation).toHaveBeenCalledWith("official.polish", false);
+    });
+    expect(screen.getByRole("button", { name: "新增 Skill" })).toBeTruthy();
+  });
+
+  it("Skill 编辑器约束与客户端边界一致", async () => {
+    mockSession("SUPER_ADMIN");
+    mockContent();
+    window.location.hash = "#/content";
+    render(<App />);
+
+    await userEvent.click(await screen.findByRole("button", { name: "新增 Skill" }));
+
+    expect(screen.getByLabelText("Skill ID").getAttribute("maxlength")).toBe("100");
+    expect(screen.getByLabelText("SF Symbol").getAttribute("maxlength")).toBe("100");
+    const sortOrder = screen.getByLabelText("排序");
+    expect(sortOrder.getAttribute("min")).toBe("0");
+    expect(sortOrder.getAttribute("max")).toBe("100000");
+    screen.getAllByLabelText("名称").forEach((input) => {
+      expect(input.getAttribute("maxlength")).toBe("40");
+    });
+    screen.getAllByLabelText("摘要").forEach((input) => {
+      expect(input.getAttribute("maxlength")).toBe("200");
+    });
+    screen.getAllByLabelText("Prompt").forEach((input) => {
+      expect(input.getAttribute("maxlength")).toBe("6000");
+    });
+  });
+});
+
+function mockSession(role: AdminRole) {
+  vi.spyOn(adminApi, "session").mockResolvedValue({
+    authenticated: true,
+    operatorName: "owner",
+    role,
+  });
+}
+
+function mockContent() {
+  vi.spyOn(adminApi, "contentSkills").mockResolvedValue(catalog());
+  vi.spyOn(adminApi, "contentHintPack").mockResolvedValue({
+    locale: "zh",
+    generatedAt: "2026-08-21T04:00:00Z",
+    intervalHours: 12,
+    version: 2,
+    cards: [],
+  });
+}
+
+function catalog(): OfficialSkillCatalog {
+  return {
+    revision: 3,
+    generatedAt: "2026-08-21T04:00:00Z",
+    skills: [
+      {
+        id: "official.polish",
+        systemImage: "wand.and.sparkles",
+        sortOrder: 10,
+        kind: "transform",
+        thinkingEnabled: false,
+        enabled: true,
+        localizations: {
+          "zh-Hans": {
+            name: "润色",
+            summary: "优化表达",
+            prompt: "请润色",
+          },
+          en: {
+            name: "Polish",
+            summary: "Improve wording",
+            prompt: "Please polish",
+          },
+        },
+      },
+    ],
+  };
+}
diff --git a/admin-web/src/test/format.test.ts b/admin-web/src/test/format.test.ts
index 719c12c..a07ac0a 100644
--- a/admin-web/src/test/format.test.ts
+++ b/admin-web/src/test/format.test.ts
@@ -32,6 +32,10 @@ describe("format helpers", () => {
     expect(statusLabel("custom")).toBe("custom");
   });
 
+  it("反滥用限制不会误显示为账户停用", () => {
+    expect(statusLabel("suspended")).toBe("反滥用受限");
+  });
+
   it("消费类型使用清晰的中文标签", () => {
     expect(usageTypeLabel("polish")).toBe("润色");
     expect(usageTypeLabel("hotword")).toBe("热词");
diff --git a/admin-web/src/test/pages.test.tsx b/admin-web/src/test/pages.test.tsx
index abadd23..4f30502 100644
--- a/admin-web/src/test/pages.test.tsx
+++ b/admin-web/src/test/pages.test.tsx
@@ -229,6 +229,9 @@ describe("React 管理页面", () => {
     expect(screen.getByText(/较上周 \+12\.5%/)).toBeTruthy();
     expect(screen.getByText("2026-08-01")).toBeTruthy();
     expect(screen.getByText("文字润色")).toBeTruthy();
+    expect(screen.getByText("键盘中英文输入")).toBeTruthy();
+    expect(screen.getByText("中文活跃用户")).toBeTruthy();
+    expect(screen.getByText("中英混合")).toBeTruthy();
     expect(screen.getByText("7 天免费转付费")).toBeTruthy();
   });
 
@@ -331,6 +334,25 @@ function analyticsOverview(): ProductAnalyticsOverview {
     aiFeatures: [
       { feature: "POLISH", executionMode: "MANAGED", users: 30, successes: 100 },
     ],
+    keyboardUsage: {
+      activeUsers: 40,
+      activationToInput: rate(40, 50, 80),
+      chineseActiveUsers: 30,
+      englishActiveUsers: 20,
+      bilingualActiveUsers: 10,
+      totalCharacters: 12_000,
+      chineseCharacters: 7_000,
+      englishCharacters: 4_000,
+      otherCharacters: 1_000,
+      chineseSharePercent: 63.6,
+      englishSharePercent: 36.4,
+      inputSessions: 200,
+      averageCharactersPerInputSession: 60,
+      chineseOnlySessions: 100,
+      englishOnlySessions: 60,
+      mixedLanguageSessions: 30,
+      otherOnlySessions: 10,
+    },
     referralFunnel: [
       { label: "发起分享", count: 20 },
       { label: "完成奖励", count: 5 },
diff --git a/deploy/smoke/runtime-grants.sql b/deploy/smoke/runtime-grants.sql
index dddaa51..fd06014 100644
--- a/deploy/smoke/runtime-grants.sql
+++ b/deploy/smoke/runtime-grants.sql
@@ -9,6 +9,7 @@ GRANT SELECT ON osg_account_smoke.credit_reservations TO 'osg_smoke_runtime'@'%'
 GRANT SELECT ON osg_account_smoke.referral_campaigns TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.referral_campaign_budgets TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.referral_codes TO 'osg_smoke_runtime'@'%';
+GRANT SELECT ON osg_account_smoke.referral_owner_codes TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.referral_bindings TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.credit_usage_records TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.credit_ledger TO 'osg_smoke_runtime'@'%';
@@ -32,6 +33,11 @@ GRANT SELECT ON osg_account_smoke.storekit_credit_purchases TO 'osg_smoke_runtim
 GRANT SELECT ON osg_account_smoke.product_analytics_installations TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.product_analytics_events TO 'osg_smoke_runtime'@'%';
 GRANT SELECT ON osg_account_smoke.product_analytics_daily_counters TO 'osg_smoke_runtime'@'%';
+GRANT SELECT ON osg_account_smoke.keyboard_usage_daily_summaries TO 'osg_smoke_runtime'@'%';
+GRANT SELECT ON osg_account_smoke.official_content_catalog TO 'osg_smoke_runtime'@'%';
+GRANT SELECT ON osg_account_smoke.official_skills TO 'osg_smoke_runtime'@'%';
+GRANT SELECT ON osg_account_smoke.official_skill_localizations TO 'osg_smoke_runtime'@'%';
+GRANT SELECT ON osg_account_smoke.official_hint_packs TO 'osg_smoke_runtime'@'%';
 
 GRANT INSERT, UPDATE, DELETE ON osg_account_smoke.accounts TO 'osg_smoke_runtime'@'%';
 GRANT INSERT, UPDATE ON osg_account_smoke.apple_credentials TO 'osg_smoke_runtime'@'%';
@@ -41,6 +47,7 @@ GRANT INSERT, UPDATE ON osg_account_smoke.credit_accounts TO 'osg_smoke_runtime'
 GRANT INSERT, UPDATE ON osg_account_smoke.credit_reservations TO 'osg_smoke_runtime'@'%';
 GRANT UPDATE ON osg_account_smoke.referral_campaign_budgets TO 'osg_smoke_runtime'@'%';
 GRANT INSERT ON osg_account_smoke.referral_codes TO 'osg_smoke_runtime'@'%';
+GRANT INSERT ON osg_account_smoke.referral_owner_codes TO 'osg_smoke_runtime'@'%';
 GRANT INSERT, UPDATE ON osg_account_smoke.referral_bindings TO 'osg_smoke_runtime'@'%';
 GRANT INSERT ON osg_account_smoke.credit_usage_records TO 'osg_smoke_runtime'@'%';
 GRANT INSERT ON osg_account_smoke.credit_ledger TO 'osg_smoke_runtime'@'%';
@@ -67,3 +74,9 @@ GRANT INSERT, UPDATE, DELETE ON osg_account_smoke.product_analytics_installation
 GRANT INSERT ON osg_account_smoke.product_analytics_events TO 'osg_smoke_runtime'@'%';
 GRANT INSERT, UPDATE ON osg_account_smoke.product_analytics_daily_counters
     TO 'osg_smoke_runtime'@'%';
+GRANT INSERT, DELETE ON osg_account_smoke.keyboard_usage_daily_summaries
+    TO 'osg_smoke_runtime'@'%';
+GRANT UPDATE ON osg_account_smoke.official_content_catalog TO 'osg_smoke_runtime'@'%';
+GRANT INSERT, UPDATE ON osg_account_smoke.official_skills TO 'osg_smoke_runtime'@'%';
+GRANT INSERT, UPDATE ON osg_account_smoke.official_skill_localizations TO 'osg_smoke_runtime'@'%';
+GRANT INSERT, UPDATE ON osg_account_smoke.official_hint_packs TO 'osg_smoke_runtime'@'%';
diff --git a/docs/ACCOUNT_DATA.md b/docs/ACCOUNT_DATA.md
index 304f9fa..e76066f 100644
--- a/docs/ACCOUNT_DATA.md
+++ b/docs/ACCOUNT_DATA.md
@@ -7,6 +7,9 @@
 - Product analytics installations linked to the account and all of their events
   are deleted by database cascade. The service stores only the digest of a
   random installation UUID and never stores user content in analytics events.
+- Keyboard usage contains daily Chinese, English, other-character and
+  input-session counters only. It never contains text or keystrokes and is
+  purged after 90 days regardless of account linkage.
 - Pseudonymous immutable credit-ledger entries, StoreKit transaction audit data,
   and time-limited anti-abuse tombstones remain after deletion where required to
   prevent replay, preserve financial integrity, and stop repeated trial abuse.
diff --git a/docs/ANALYTICS_METRICS_DICTIONARY.md b/docs/ANALYTICS_METRICS_DICTIONARY.md
index 8080e13..d221262 100644
--- a/docs/ANALYTICS_METRICS_DICTIONARY.md
+++ b/docs/ANALYTICS_METRICS_DICTIONARY.md
@@ -69,6 +69,51 @@ Managed client success events are excluded from this total.
 
 `successful AI requests / distinct value-active users` for the selected period.
 
+## Keyboard input usage
+
+Keyboard input metrics use finalized UTC-day summaries produced on-device.
+They describe manually committed OSGKeyboard text only and are independent
+from AI value events, billing and referral qualification.
+
+### Keyboard input active users
+
+Distinct account identities, falling back to pseudonymous installations, with
+at least one accepted keyboard usage summary in the selected UTC-date window.
+
+### Activation-to-input conversion
+
+Keyboard input active users divided by distinct identities with either a
+`KEYBOARD_ACTIVATED` event or an accepted keyboard usage summary in the same
+UTC-date window. Including summary-only identities prevents missing activation
+telemetry from producing rates above 100%.
+
+### Chinese, English and bilingual active users
+
+- Chinese active: at least one committed Han-script character.
+- English active: at least one committed Latin letter.
+- Bilingual active: both Chinese and English counts are non-zero.
+
+These populations overlap and must not be summed.
+
+### Character volume and language share
+
+Character volume is the sum of client-classified Chinese, English and other
+committed characters. Chinese and English share use only classified language
+characters as the denominator:
+
+- Chinese share: `Chinese / (Chinese + English)`.
+- English share: `English / (Chinese + English)`.
+
+Both shares are unavailable when the denominator is zero. Other characters
+remain visible in total volume but do not dilute the language split.
+
+### Input sessions
+
+An input session is a keyboard activation containing at least one manually
+committed character. Chinese-only, English-only, mixed-language and other-only
+session counts form a complete partition. Average characters per input session
+is `total committed characters / input sessions`.
+
 ## Retention
 
 The cohort date is the UTC date of a user's first successful AI feature.
diff --git a/docs/PRODUCT_ANALYTICS.md b/docs/PRODUCT_ANALYTICS.md
index bf8fb69..9e65a58 100644
--- a/docs/PRODUCT_ANALYTICS.md
+++ b/docs/PRODUCT_ANALYTICS.md
@@ -8,7 +8,7 @@ from billing, provider execution and immutable credit ledgers.
 Never send or persist:
 
 - audio or audio-derived content;
-- keyboard input, prompts, context, transcripts or model output;
+- raw keyboard input, keystrokes, prompts, context, transcripts or model output;
 - Apple subjects, email addresses, names, tokens, API keys or provider
   credentials;
 - arbitrary property names or free-form text.
@@ -18,6 +18,8 @@ the identifier supplied by the client. Event DTO string representations are
 redacted. Product analytics rows linked to an account are deleted with that
 account. Anonymous installations that never link to an account are retained for
 90 days and are eligible for scheduled deletion in a later operational job.
+Per-installation keyboard usage summaries are retained for at most 90 days
+regardless of account linkage.
 
 ## Ingestion API
 
@@ -40,6 +42,38 @@ account. Anonymous installations that never link to an account are retained for
 The successful response reports `accepted` and `replayed` event counts. It does
 not return account or installation identifiers.
 
+## Keyboard usage summaries
+
+`POST /v1/analytics/keyboard-usage` accepts 1 to 50 finalized UTC-day
+summaries. Authentication, installation hashing, account linking, atomic
+batching and replay semantics match the event ingestion API.
+
+- Language classification and counting happen on-device.
+- Only text manually committed by OSGKeyboard is counted. Voice transcripts,
+  pasted text, AI-generated output and text entered with another keyboard are
+  excluded.
+- Chinese counts Unicode characters classified with the Han script. English
+  counts Latin letters. Digits, punctuation and Emoji are counted as `other`.
+- Pinyin composition keystrokes are not counted as English; only the final
+  committed text is classified.
+- An input session is one keyboard activation containing at least one
+  committed character.
+- Chinese-only sessions contain Chinese but no English; English-only sessions
+  contain English but no Chinese; mixed sessions contain both. Other
+  characters may occur in any of those sessions. Other-only sessions contain
+  neither Chinese nor English.
+- The four language-session counters must sum to `inputSessionCount`, and the
+  total committed character count must be at least the session count.
+- Each installation may submit only one immutable summary per UTC date.
+- Accepted dates are from 35 days ago through yesterday. Current-day partial
+  summaries are rejected.
+- Raw text, per-keystroke events, surrounding context, host application
+  identifiers and free-form properties are never accepted.
+
+The client should keep counters and the finalized outbox in the shared App
+Group so either the containing app or keyboard extension can deliver them.
+Retries must reuse the stored `clientSummaryId`.
+
 ## Event catalog
 
 ### Lifecycle events
@@ -186,6 +220,8 @@ The admin analytics endpoints combine:
 - settled credit usage for managed AI counts and credit consumption;
 - accounts, StoreKit and referrals for registration, monetization and referral
   outcomes.
+- daily keyboard summaries for privacy-minimized Chinese and English input
+  activity, character volume and input sessions.
 
 Metric formulas are defined in
 [`ANALYTICS_METRICS_DICTIONARY.md`](ANALYTICS_METRICS_DICTIONARY.md).
diff --git a/docs/mysql-minimum-privileges.sql b/docs/mysql-minimum-privileges.sql
index de9005d..8c95f2f 100644
--- a/docs/mysql-minimum-privileges.sql
+++ b/docs/mysql-minimum-privileges.sql
@@ -21,6 +21,7 @@ GRANT SELECT ON osg_account.credit_reservations TO 'osg_account_runtime'@'10.20.
 GRANT SELECT ON osg_account.referral_campaigns TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.referral_campaign_budgets TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.referral_codes TO 'osg_account_runtime'@'10.20.%';
+GRANT SELECT ON osg_account.referral_owner_codes TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.referral_bindings TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.credit_usage_records TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.credit_ledger TO 'osg_account_runtime'@'10.20.%';
@@ -44,6 +45,11 @@ GRANT SELECT ON osg_account.storekit_credit_purchases TO 'osg_account_runtime'@'
 GRANT SELECT ON osg_account.product_analytics_installations TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.product_analytics_events TO 'osg_account_runtime'@'10.20.%';
 GRANT SELECT ON osg_account.product_analytics_daily_counters TO 'osg_account_runtime'@'10.20.%';
+GRANT SELECT ON osg_account.keyboard_usage_daily_summaries TO 'osg_account_runtime'@'10.20.%';
+GRANT SELECT ON osg_account.official_content_catalog TO 'osg_account_runtime'@'10.20.%';
+GRANT SELECT ON osg_account.official_skills TO 'osg_account_runtime'@'10.20.%';
+GRANT SELECT ON osg_account.official_skill_localizations TO 'osg_account_runtime'@'10.20.%';
+GRANT SELECT ON osg_account.official_hint_packs TO 'osg_account_runtime'@'10.20.%';
 
 GRANT INSERT, UPDATE, DELETE ON osg_account.accounts TO 'osg_account_runtime'@'10.20.%';
 GRANT INSERT, UPDATE ON osg_account.apple_credentials TO 'osg_account_runtime'@'10.20.%';
@@ -53,6 +59,7 @@ GRANT INSERT, UPDATE ON osg_account.credit_accounts TO 'osg_account_runtime'@'10
 GRANT INSERT, UPDATE ON osg_account.credit_reservations TO 'osg_account_runtime'@'10.20.%';
 GRANT UPDATE ON osg_account.referral_campaign_budgets TO 'osg_account_runtime'@'10.20.%';
 GRANT INSERT ON osg_account.referral_codes TO 'osg_account_runtime'@'10.20.%';
+GRANT INSERT ON osg_account.referral_owner_codes TO 'osg_account_runtime'@'10.20.%';
 GRANT INSERT, UPDATE ON osg_account.referral_bindings TO 'osg_account_runtime'@'10.20.%';
 GRANT INSERT ON osg_account.credit_usage_records TO 'osg_account_runtime'@'10.20.%';
 GRANT INSERT ON osg_account.credit_ledger TO 'osg_account_runtime'@'10.20.%';
@@ -81,6 +88,12 @@ GRANT INSERT, UPDATE, DELETE ON osg_account.product_analytics_installations
 GRANT INSERT ON osg_account.product_analytics_events TO 'osg_account_runtime'@'10.20.%';
 GRANT INSERT, UPDATE ON osg_account.product_analytics_daily_counters
     TO 'osg_account_runtime'@'10.20.%';
+GRANT INSERT, DELETE ON osg_account.keyboard_usage_daily_summaries
+    TO 'osg_account_runtime'@'10.20.%';
+GRANT UPDATE ON osg_account.official_content_catalog TO 'osg_account_runtime'@'10.20.%';
+GRANT INSERT, UPDATE ON osg_account.official_skills TO 'osg_account_runtime'@'10.20.%';
+GRANT INSERT, UPDATE ON osg_account.official_skill_localizations TO 'osg_account_runtime'@'10.20.%';
+GRANT INSERT, UPDATE ON osg_account.official_hint_packs TO 'osg_account_runtime'@'10.20.%';
 
 -- Deliberately absent: global privileges, GRANT OPTION, FILE, PROCESS, SUPER,
 -- CREATE USER, and UPDATE/DELETE on immutable ledger or usage-history tables.
diff --git a/docs/openapi.yaml b/docs/openapi.yaml
index b557458..535f3dc 100644
--- a/docs/openapi.yaml
+++ b/docs/openapi.yaml
@@ -100,6 +100,33 @@ paths:
         "409": { $ref: "#/components/responses/Error" }
         "422": { $ref: "#/components/responses/Error" }
         default: { $ref: "#/components/responses/Error" }
+  /v1/analytics/keyboard-usage:
+    post:
+      security:
+        - {}
+        - bearerAuth: []
+      summary: Idempotently accept privacy-minimized daily keyboard usage summaries
+      description: |
+        Accepts finalized UTC-day counters for text manually committed by
+        OSGKeyboard. Language classification happens on-device. Raw text,
+        keystrokes, surrounding context, host application identifiers, voice
+        transcripts and AI output are never accepted. The current UTC date is
+        not accepted because daily summaries are immutable once submitted.
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema: { $ref: "#/components/schemas/KeyboardUsageBatchRequest" }
+      responses:
+        "200":
+          description: Atomic batch acceptance and replay counts
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/ProductAnalyticsBatchResponse" }
+        "400": { $ref: "#/components/responses/Error" }
+        "409": { $ref: "#/components/responses/Error" }
+        "422": { $ref: "#/components/responses/Error" }
+        default: { $ref: "#/components/responses/Error" }
   /v1/account:
     get:
       summary: Return the account profile
@@ -477,6 +504,100 @@ paths:
       responses:
         "101": { description: WebSocket upgrade }
         default: { $ref: "#/components/responses/GatewayError" }
+  /v1/content/skills:
+    get:
+      security: []
+      summary: Return the enabled official Skill catalog
+      parameters:
+        - name: If-None-Match
+          in: header
+          schema: { type: string }
+      responses:
+        "200":
+          description: Versioned official Skill catalog
+          headers:
+            ETag: { schema: { type: string } }
+            Cache-Control: { schema: { type: string, const: "public,max-age=300" } }
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/OfficialSkillCatalog" }
+        "304": { description: The caller already has the current revision }
+  /v1/content/hints/manifest:
+    get:
+      security: []
+      summary: Return the published AI Hint pack manifest
+      parameters:
+        - name: If-None-Match
+          in: header
+          schema: { type: string }
+      responses:
+        "200":
+          description: Published locale manifest
+          headers:
+            ETag: { schema: { type: string } }
+            Cache-Control: { schema: { type: string, const: "public,max-age=300" } }
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AIHintManifest" }
+        "304": { description: The caller already has the current manifest }
+  /v1/content/hints/{locale}:
+    get:
+      security: []
+      summary: Return a published AI Hint pack
+      parameters:
+        - $ref: "#/components/parameters/HintLocale"
+        - name: If-None-Match
+          in: header
+          schema: { type: string }
+      responses:
+        "200":
+          description: Published AI Hint pack
+          headers:
+            ETag: { schema: { type: string } }
+            Cache-Control: { schema: { type: string, const: "public,max-age=300" } }
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AIHintPack" }
+        "304": { description: The caller already has this pack version }
+        "404": { description: Locale is unsupported or has not been published }
+  /hints/manifest.json:
+    get:
+      security: []
+      summary: Return the AI Hint manifest at the legacy file path
+      parameters:
+        - name: If-None-Match
+          in: header
+          schema: { type: string }
+      responses:
+        "200":
+          description: Same payload and cache validators as /v1/content/hints/manifest
+          headers:
+            ETag: { schema: { type: string } }
+            Cache-Control: { schema: { type: string, const: "public,max-age=300" } }
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AIHintManifest" }
+        "304": { description: The caller already has the current manifest }
+  /hints/hints-{locale}.json:
+    get:
+      security: []
+      summary: Return an AI Hint pack at the legacy file path
+      parameters:
+        - $ref: "#/components/parameters/HintLocale"
+        - name: If-None-Match
+          in: header
+          schema: { type: string }
+      responses:
+        "200":
+          description: Same payload and cache validators as /v1/content/hints/{locale}
+          headers:
+            ETag: { schema: { type: string } }
+            Cache-Control: { schema: { type: string, const: "public,max-age=300" } }
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AIHintPack" }
+        "304": { description: The caller already has this pack version }
+        "404": { description: Locale is unsupported or has not been published }
   /.well-known/apple-app-site-association:
     get:
       servers:
@@ -522,6 +643,125 @@ paths:
         "200": { description: Bilingual HTML landing page }
         "404": { description: Invalid, unknown, or expired invitation }
         "503": { description: Invitation lookup is temporarily unavailable }
+  /v1/admin/content/skills:
+    get:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: List all official Skills including disabled entries
+      responses:
+        "200":
+          description: Administrative Skill catalog
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AdminOfficialSkillCatalog" }
+        "403": { description: SUPER_ADMIN or SUPPORT role is required }
+    post:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Create a disabled official Skill
+      parameters:
+        - $ref: "#/components/parameters/AdminCsrf"
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema: { $ref: "#/components/schemas/CreateOfficialSkillRequest" }
+      responses:
+        "201":
+          description: Skill created
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AdminOfficialSkill" }
+        "400": { description: Request is invalid }
+        "403": { description: SUPER_ADMIN role and valid CSRF are required }
+        "409": { description: Skill ID already exists }
+  /v1/admin/content/skills/{id}:
+    put:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Update an official Skill and increment catalog revision
+      parameters:
+        - $ref: "#/components/parameters/OfficialSkillId"
+        - $ref: "#/components/parameters/AdminCsrf"
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema: { $ref: "#/components/schemas/UpdateOfficialSkillRequest" }
+      responses:
+        "200":
+          description: Skill updated
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AdminOfficialSkill" }
+        "400": { description: Request is invalid }
+        "403": { description: SUPER_ADMIN role and valid CSRF are required }
+        "404": { description: Skill was not found }
+  /v1/admin/content/skills/{id}/enable:
+    post:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Enable an official Skill and increment catalog revision
+      parameters:
+        - $ref: "#/components/parameters/OfficialSkillId"
+        - $ref: "#/components/parameters/AdminCsrf"
+      responses:
+        "204": { description: Skill enabled }
+        "403": { description: SUPER_ADMIN role and valid CSRF are required }
+        "404": { description: Skill was not found }
+  /v1/admin/content/skills/{id}/disable:
+    post:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Disable an official Skill and increment catalog revision
+      parameters:
+        - $ref: "#/components/parameters/OfficialSkillId"
+        - $ref: "#/components/parameters/AdminCsrf"
+      responses:
+        "204": { description: Skill disabled }
+        "403": { description: SUPER_ADMIN role and valid CSRF are required }
+        "404": { description: Skill was not found }
+  /v1/admin/content/hints/{locale}:
+    get:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Return a locale Hint pack for editing
+      parameters:
+        - $ref: "#/components/parameters/HintLocale"
+      responses:
+        "200":
+          description: Existing pack or an empty version-zero editor document
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AdminAIHintPack" }
+        "403": { description: SUPER_ADMIN or SUPPORT role is required }
+    put:
+      security:
+        - adminMtls: []
+          adminSession: []
+      summary: Immediately publish a locale Hint pack and increment its version
+      parameters:
+        - $ref: "#/components/parameters/HintLocale"
+        - $ref: "#/components/parameters/AdminCsrf"
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema: { $ref: "#/components/schemas/UpdateAIHintPackRequest" }
+      responses:
+        "200":
+          description: Published pack
+          content:
+            application/json:
+              schema: { $ref: "#/components/schemas/AdminAIHintPack" }
+        "400": { description: Pack is invalid }
+        "403": { description: SUPER_ADMIN role and valid CSRF are required }
   /v1/admin/auth/session:
     get:
       security:
@@ -941,6 +1181,11 @@ paths:
               - OPERATOR_CREDENTIALS_RESET
               - OPERATOR_SESSIONS_REVOKED
               - MANUAL_CREDIT_GRANTED
+              - CONTENT_SKILL_CREATED
+              - CONTENT_SKILL_UPDATED
+              - CONTENT_SKILL_ENABLED
+              - CONTENT_SKILL_DISABLED
+              - CONTENT_HINT_PACK_PUBLISHED
         - name: result
           in: query
           schema: { type: string, enum: [success, rejected] }
@@ -982,6 +1227,19 @@ components:
       in: header
       required: true
       schema: { type: string, minLength: 8, maxLength: 128 }
+    OfficialSkillId:
+      name: id
+      in: path
+      required: true
+      schema:
+        type: string
+        maxLength: 100
+        pattern: "^official\\.[a-z0-9._-]+$"
+    HintLocale:
+      name: locale
+      in: path
+      required: true
+      schema: { type: string, enum: [zh, en] }
     AdminCsrf:
       name: X-CSRF-Token
       in: header
@@ -1125,6 +1383,55 @@ components:
           minItems: 1
           maxItems: 50
           items: { $ref: "#/components/schemas/ProductAnalyticsEvent" }
+    KeyboardUsageSummary:
+      type: object
+      additionalProperties: false
+      required:
+        - clientSummaryId
+        - summaryDate
+        - chineseCharacterCount
+        - englishCharacterCount
+        - otherCharacterCount
+        - inputSessionCount
+        - chineseOnlySessionCount
+        - englishOnlySessionCount
+        - mixedLanguageSessionCount
+        - otherOnlySessionCount
+      properties:
+        clientSummaryId: { type: string, format: uuid }
+        summaryDate:
+          type: string
+          format: date
+          description: Finalized UTC date; accepted from 35 days ago through yesterday.
+        chineseCharacterCount: { type: integer, format: int64, minimum: 0, maximum: 1000000 }
+        englishCharacterCount: { type: integer, format: int64, minimum: 0, maximum: 1000000 }
+        otherCharacterCount: { type: integer, format: int64, minimum: 0, maximum: 1000000 }
+        inputSessionCount: { type: integer, format: int64, minimum: 1, maximum: 100000 }
+        chineseOnlySessionCount: { type: integer, format: int64, minimum: 0, maximum: 100000 }
+        englishOnlySessionCount: { type: integer, format: int64, minimum: 0, maximum: 100000 }
+        mixedLanguageSessionCount: { type: integer, format: int64, minimum: 0, maximum: 100000 }
+        otherOnlySessionCount: { type: integer, format: int64, minimum: 0, maximum: 100000 }
+        appVersion:
+          type: string
+          minLength: 1
+          maxLength: 32
+          pattern: "^[A-Za-z0-9._+-]+$"
+        osVersion:
+          type: string
+          minLength: 1
+          maxLength: 32
+          pattern: "^[A-Za-z0-9._+-]+$"
+    KeyboardUsageBatchRequest:
+      type: object
+      additionalProperties: false
+      required: [installationId, summaries]
+      properties:
+        installationId: { type: string, format: uuid }
+        summaries:
+          type: array
+          minItems: 1
+          maxItems: 50
+          items: { $ref: "#/components/schemas/KeyboardUsageSummary" }
     ProductAnalyticsBatchResponse:
       type: object
       additionalProperties: false
@@ -1132,6 +1439,172 @@ components:
       properties:
         accepted: { type: integer, minimum: 0, maximum: 50 }
         replayed: { type: integer, minimum: 0, maximum: 50 }
+    SkillLocalization:
+      type: object
+      additionalProperties: false
+      required: [name, summary, prompt]
+      properties:
+        name: { type: string, minLength: 1, maxLength: 40 }
+        summary: { type: string, minLength: 1, maxLength: 200 }
+        prompt: { type: string, minLength: 1, maxLength: 6000 }
+    SkillLocalizations:
+      type: object
+      additionalProperties: false
+      required: [zh-Hans, en]
+      properties:
+        zh-Hans: { $ref: "#/components/schemas/SkillLocalization" }
+        en: { $ref: "#/components/schemas/SkillLocalization" }
+    OfficialSkill:
+      type: object
+      additionalProperties: false
+      required: [id, systemImage, sortOrder, kind, thinkingEnabled, localizations]
+      properties:
+        id:
+          type: string
+          maxLength: 100
+          pattern: "^official\\.[a-z0-9._-]+$"
+        systemImage: { type: string, minLength: 1, maxLength: 100 }
+        sortOrder: { type: integer, minimum: 0, maximum: 100000 }
+        kind: { type: string, const: transform }
+        thinkingEnabled: { type: boolean }
+        localizations: { $ref: "#/components/schemas/SkillLocalizations" }
+    AdminOfficialSkill:
+      type: object
+      additionalProperties: false
+      required: [id, systemImage, sortOrder, kind, thinkingEnabled, enabled, localizations]
+      properties:
+        id:
+          type: string
+          maxLength: 100
+          pattern: "^official\\.[a-z0-9._-]+$"
+        systemImage: { type: string, minLength: 1, maxLength: 100 }
+        sortOrder: { type: integer, minimum: 0, maximum: 100000 }
+        kind: { type: string, const: transform }
+        thinkingEnabled: { type: boolean }
+        enabled: { type: boolean }
+        localizations: { $ref: "#/components/schemas/SkillLocalizations" }
+    OfficialSkillCatalog:
+      type: object
+      additionalProperties: false
+      required: [schemaVersion, revision, skills]
+      properties:
+        schemaVersion: { type: integer, const: 1 }
+        revision: { type: integer, format: int64, minimum: 0 }
+        generatedAt: { type: string, format: date-time }
+        skills:
+          type: array
+          maxItems: 100
+          items: { $ref: "#/components/schemas/OfficialSkill" }
+    AdminOfficialSkillCatalog:
+      type: object
+      additionalProperties: false
+      required: [revision, skills]
+      properties:
+        revision: { type: integer, format: int64, minimum: 0 }
+        generatedAt: { type: string, format: date-time }
+        skills:
+          type: array
+          items: { $ref: "#/components/schemas/AdminOfficialSkill" }
+    CreateOfficialSkillRequest:
+      type: object
+      additionalProperties: false
+      required: [id, systemImage, sortOrder, thinkingEnabled, localizations]
+      properties:
+        id:
+          type: string
+          maxLength: 100
+          pattern: "^official\\.[a-z0-9._-]+$"
+        systemImage: { type: string, minLength: 1, maxLength: 100 }
+        sortOrder: { type: integer, minimum: 0, maximum: 100000 }
+        thinkingEnabled: { type: boolean }
+        localizations: { $ref: "#/components/schemas/SkillLocalizations" }
+    UpdateOfficialSkillRequest:
+      type: object
+      additionalProperties: false
+      required: [systemImage, sortOrder, thinkingEnabled, localizations]
+      properties:
+        systemImage: { type: string, minLength: 1, maxLength: 100 }
+        sortOrder: { type: integer, minimum: 0, maximum: 100000 }
+        thinkingEnabled: { type: boolean }
+        localizations: { $ref: "#/components/schemas/SkillLocalizations" }
+    AIHintCard:
+      type: object
+      additionalProperties: false
+      required: [id, prompt, category, priority, source, locale, conditions]
+      anyOf:
+        - required: [displayText]
+        - required: [text]
+      properties:
+        id: { type: string, minLength: 1, maxLength: 128 }
+        displayText: { type: string, minLength: 1, maxLength: 500 }
+        text: { type: string, minLength: 1, maxLength: 500 }
+        prompt: { type: string, minLength: 1, maxLength: 16000 }
+        category: { type: string, minLength: 1, maxLength: 64 }
+        priority: { type: integer, minimum: -10000, maximum: 10000 }
+        source: { type: string, minLength: 1, maxLength: 64 }
+        locale: { type: string, enum: [zh, en] }
+        conditions:
+          type: array
+          maxItems: 20
+          items: { type: string, minLength: 1, maxLength: 64 }
+        metadata:
+          type: object
+          additionalProperties: true
+    AIHintPack:
+      type: object
+      additionalProperties: false
+      required: [locale, version, cards]
+      properties:
+        locale: { type: string, enum: [zh, en] }
+        generatedAt: { type: string, format: date-time }
+        expiresAt: { type: string, format: date-time }
+        version: { type: integer, minimum: 1 }
+        cards:
+          type: array
+          maxItems: 500
+          items: { $ref: "#/components/schemas/AIHintCard" }
+    AdminAIHintPack:
+      type: object
+      additionalProperties: false
+      required: [locale, version, cards]
+      properties:
+        locale: { type: string, enum: [zh, en] }
+        generatedAt: { type: string, format: date-time }
+        expiresAt: { type: string, format: date-time }
+        intervalHours: { type: integer, minimum: 1, maximum: 168 }
+        version: { type: integer, minimum: 0 }
+        cards:
+          type: array
+          maxItems: 500
+          items: { $ref: "#/components/schemas/AIHintCard" }
+    UpdateAIHintPackRequest:
+      type: object
+      additionalProperties: false
+      required: [cards]
+      properties:
+        generatedAt: { type: string, format: date-time }
+        expiresAt: { type: string, format: date-time }
+        intervalHours: { type: integer, minimum: 1, maximum: 168 }
+        cards:
+          type: array
+          maxItems: 500
+          items: { $ref: "#/components/schemas/AIHintCard" }
+    AIHintManifest:
+      type: object
+      additionalProperties: false
+      required: [locales, files]
+      properties:
+        generatedAt: { type: string, format: date-time }
+        expiresAt: { type: string, format: date-time }
+        intervalHours: { type: integer, minimum: 1, maximum: 168 }
+        locales:
+          type: array
+          uniqueItems: true
+          items: { type: string, enum: [zh, en] }
+        files:
+          type: object
+          additionalProperties:
+            type: [string, "null"]
     AdminSessionState:
       type: object
       additionalProperties: false
@@ -1286,6 +1759,42 @@ components:
         executionMode: { type: string, enum: [MANAGED, LOCAL, BYOK] }
         users: { type: integer, format: int64, minimum: 0 }
         successes: { type: integer, format: int64, minimum: 0 }
+    AdminAnalyticsKeyboardUsage:
+      type: object
+      additionalProperties: false
+      required:
+        - activeUsers
+        - activationToInput
+        - chineseActiveUsers
+        - englishActiveUsers
+        - bilingualActiveUsers
+        - totalCharacters
+        - chineseCharacters
+        - englishCharacters
+        - otherCharacters
+        - inputSessions
+        - chineseOnlySessions
+        - englishOnlySessions
+        - mixedLanguageSessions
+        - otherOnlySessions
+      properties:
+        activeUsers: { type: integer, format: int64, minimum: 0 }
+        activationToInput: { $ref: "#/components/schemas/AdminAnalyticsRate" }
+        chineseActiveUsers: { type: integer, format: int64, minimum: 0 }
+        englishActiveUsers: { type: integer, format: int64, minimum: 0 }
+        bilingualActiveUsers: { type: integer, format: int64, minimum: 0 }
+        totalCharacters: { type: integer, format: int64, minimum: 0 }
+        chineseCharacters: { type: integer, format: int64, minimum: 0 }
+        englishCharacters: { type: integer, format: int64, minimum: 0 }
+        otherCharacters: { type: integer, format: int64, minimum: 0 }
+        chineseSharePercent: { type: ["number", "null"], minimum: 0, maximum: 100 }
+        englishSharePercent: { type: ["number", "null"], minimum: 0, maximum: 100 }
+        inputSessions: { type: integer, format: int64, minimum: 0 }
+        averageCharactersPerInputSession: { type: ["number", "null"], minimum: 0 }
+        chineseOnlySessions: { type: integer, format: int64, minimum: 0 }
+        englishOnlySessions: { type: integer, format: int64, minimum: 0 }
+        mixedLanguageSessions: { type: integer, format: int64, minimum: 0 }
+        otherOnlySessions: { type: integer, format: int64, minimum: 0 }
     AdminProductAnalytics:
       type: object
       additionalProperties: false
@@ -1299,6 +1808,7 @@ components:
         - growthFunnel
         - retention
         - aiFeatures
+        - keyboardUsage
         - referralFunnel
         - guardrails
       properties:
@@ -1370,6 +1880,8 @@ components:
         aiFeatures:
           type: array
           items: { $ref: "#/components/schemas/AdminAnalyticsFeatureUsage" }
+        keyboardUsage:
+          $ref: "#/components/schemas/AdminAnalyticsKeyboardUsage"
         referralFunnel:
           type: array
           items: { $ref: "#/components/schemas/AdminAnalyticsFunnelStep" }
diff --git a/src/main/kotlin/com/osglab/account/Application.kt b/src/main/kotlin/com/osglab/account/Application.kt
index 2e469e0..c6f0db5 100644
--- a/src/main/kotlin/com/osglab/account/Application.kt
+++ b/src/main/kotlin/com/osglab/account/Application.kt
@@ -68,6 +68,11 @@ import com.osglab.account.features.credits.routes.creditRoutes
 import com.osglab.account.features.credits.services.CreditOperations
 import com.osglab.account.features.credits.services.CreditService
 import com.osglab.account.features.credits.services.ReferralRewardConfig
+import com.osglab.account.features.credits.services.signupTrialIdempotencyKey
+import com.osglab.account.features.content.repositories.ContentRepository
+import com.osglab.account.features.content.repositories.ExposedContentRepository
+import com.osglab.account.features.content.routes.contentRoutes
+import com.osglab.account.features.content.services.ContentService
 import com.osglab.account.features.gateway.adapters.CreditReservationAdapter
 import com.osglab.account.features.gateway.adapters.SessionIdentityAdapter
 import com.osglab.account.features.gateway.GatewaySettings
@@ -328,6 +333,7 @@ fun Application.module() {
             analyticsRoutes(koin.get())
             configureInviteWebRoutes(koin.get(), koin.get(), koin.get())
             integrityRoutes(koin.get())
+            contentRoutes(koin.get())
         }
         if (appConfig.admin.enabled) {
             adminWebRoutes(appConfig)
@@ -342,6 +348,7 @@ fun Application.module() {
                     grantService = koin.get(),
                     operatorService = koin.get(),
                     auditService = koin.get(),
+                    contentService = koin.get(),
                 )
             }
         }
@@ -417,6 +424,8 @@ fun accountServerModule(config: AppConfig): Module = module {
     single<AdminUsersRepository> { ExposedAdminUsersRepository(get()) }
     single { AdminUsersService(get()) }
     single { AdminGrantService(get()) }
+    single<ContentRepository> { ExposedContentRepository(get()) }
+    single { ContentService(get()) }
     single<AppleJwksProvider> {
         RemoteAppleJwksProvider(get(), config.apple.jwksUrl)
     }
@@ -486,12 +495,18 @@ fun accountServerModule(config: AppConfig): Module = module {
         )
     }
     single<TrialCreditGranter> {
-        TrialCreditGranter { accountId ->
-            get<CreditService>().grantSignupTrial(
-                userId = accountId,
-                credits = config.credits.signupTrial,
-                idempotencyKey = "internal:signup-trial:$accountId",
-            )
+        val creditService = get<CreditService>()
+        object : TrialCreditGranter {
+            override suspend fun grant(accountId: UUID) {
+                creditService.grantSignupTrial(
+                    userId = accountId,
+                    credits = config.credits.signupTrial,
+                    idempotencyKey = signupTrialIdempotencyKey(accountId),
+                )
+            }
+
+            override suspend fun wasGranted(accountId: UUID): Boolean =
+                creditService.hasSignupTrial(accountId)
         }
     }
     single {
@@ -510,8 +525,8 @@ fun accountServerModule(config: AppConfig): Module = module {
     single<ComplimentaryRequestPort> { get<ExposedGatewayRepository>() }
     single<AccountProvisioner> {
         AccountProvisioner { accountId, deviceCheckToken, displayName ->
-            val granted = get<DeviceCheckTrialService>().claimAndGrant(accountId, deviceCheckToken)
-            if (deviceCheckToken != null && !granted) {
+            val trial = get<DeviceCheckTrialService>().claimAndGrant(accountId, deviceCheckToken)
+            if (trial.shouldRestrictAccount) {
                 get<AuthRepository>().restrictAccountForAntiAbuse(
                     accountId,
                     java.time.Instant.now(),
diff --git a/src/main/kotlin/com/osglab/account/features/admin/models/AdminModels.kt b/src/main/kotlin/com/osglab/account/features/admin/models/AdminModels.kt
index 8b8dcbf..70ebf64 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/models/AdminModels.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/models/AdminModels.kt
@@ -111,6 +111,11 @@ enum class AdminAuditAction {
     OPERATOR_CREDENTIALS_RESET,
     OPERATOR_SESSIONS_REVOKED,
     MANUAL_CREDIT_GRANTED,
+    CONTENT_SKILL_CREATED,
+    CONTENT_SKILL_UPDATED,
+    CONTENT_SKILL_ENABLED,
+    CONTENT_SKILL_DISABLED,
+    CONTENT_HINT_PACK_PUBLISHED,
 }
 
 enum class AdminAuditOutcome {
diff --git a/src/main/kotlin/com/osglab/account/features/admin/routes/AdminContentRoutes.kt b/src/main/kotlin/com/osglab/account/features/admin/routes/AdminContentRoutes.kt
new file mode 100644
index 0000000..b470ec4
--- /dev/null
+++ b/src/main/kotlin/com/osglab/account/features/admin/routes/AdminContentRoutes.kt
@@ -0,0 +1,144 @@
+package com.osglab.account.features.admin.routes
+
+import com.osglab.account.config.AppConfig
+import com.osglab.account.features.admin.models.AdminPrincipal
+import com.osglab.account.features.admin.models.AdminRole
+import com.osglab.account.features.admin.services.AdminSessionService
+import com.osglab.account.features.content.models.CreateOfficialSkillRequest
+import com.osglab.account.features.content.models.UpdateHintPackRequest
+import com.osglab.account.features.content.models.UpdateOfficialSkillRequest
+import com.osglab.account.features.content.services.ContentErrorCode
+import com.osglab.account.features.content.services.ContentException
+import com.osglab.account.features.content.services.ContentService
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.application.ApplicationCall
+import io.ktor.server.application.call
+import io.ktor.server.plugins.BadRequestException
+import io.ktor.server.request.header
+import io.ktor.server.request.receive
+import io.ktor.server.response.respond
+import io.ktor.server.routing.Route
+import io.ktor.server.routing.get
+import io.ktor.server.routing.post
+import io.ktor.server.routing.put
+import io.ktor.server.routing.route
+import kotlinx.serialization.Serializable
+
+internal fun Route.adminContentRoutes(
+    config: AppConfig,
+    sessions: AdminSessionService,
+    service: ContentService,
+) {
+    route("/content") {
+        get("/skills") {
+            if (call.requireContentReader(config, sessions) == null) return@get
+            call.respond(service.adminSkills())
+        }
+
+        post("/skills") {
+            val principal = call.requireContentEditor(config, sessions) ?: return@post
+            val request = call.receiveContentRequest<CreateOfficialSkillRequest>() ?: return@post
+            call.respondContentError {
+                call.respond(
+                    HttpStatusCode.Created,
+                    service.createSkill(principal, request, call.request.header("X-Request-ID")),
+                )
+            }
+        }
+
+        put("/skills/{id}") {
+            val principal = call.requireContentEditor(config, sessions) ?: return@put
+            val id = call.parameters["id"] ?: return@put call.respondContentValidationError()
+            val request = call.receiveContentRequest<UpdateOfficialSkillRequest>() ?: return@put
+            call.respondContentError {
+                call.respond(
+                    service.updateSkill(principal, id, request, call.request.header("X-Request-ID")),
+                )
+            }
+        }
+
+        post("/skills/{id}/enable") {
+            val principal = call.requireContentEditor(config, sessions) ?: return@post
+            val id = call.parameters["id"] ?: return@post call.respondContentValidationError()
+            call.respondContentError {
+                service.setSkillEnabled(principal, id, enabled = true, call.request.header("X-Request-ID"))
+                call.respond(HttpStatusCode.NoContent)
+            }
+        }
+
+        post("/skills/{id}/disable") {
+            val principal = call.requireContentEditor(config, sessions) ?: return@post
+            val id = call.parameters["id"] ?: return@post call.respondContentValidationError()
+            call.respondContentError {
+                service.setSkillEnabled(principal, id, enabled = false, call.request.header("X-Request-ID"))
+                call.respond(HttpStatusCode.NoContent)
+            }
+        }
+
+        get("/hints/{locale}") {
+            if (call.requireContentReader(config, sessions) == null) return@get
+            val locale = call.parameters["locale"] ?: return@get call.respondContentValidationError()
+            call.respondContentError {
+                call.respond(service.adminHintPack(locale))
+            }
+        }
+
+        put("/hints/{locale}") {
+            val principal = call.requireContentEditor(config, sessions) ?: return@put
+            val locale = call.parameters["locale"] ?: return@put call.respondContentValidationError()
+            val request = call.receiveContentRequest<UpdateHintPackRequest>() ?: return@put
+            call.respondContentError {
+                call.respond(
+                    service.putHintPack(principal, locale, request, call.request.header("X-Request-ID")),
+                )
+            }
+        }
+    }
+}
+
+private suspend fun ApplicationCall.requireContentReader(
+    config: AppConfig,
+    sessions: AdminSessionService,
+) = requireRole(config, sessions, setOf(AdminRole.SUPER_ADMIN, AdminRole.SUPPORT))
+
+private suspend fun ApplicationCall.requireContentEditor(
+    config: AppConfig,
+    sessions: AdminSessionService,
+): AdminPrincipal? {
+    val principal = requireMutationPrincipal(config, sessions) ?: return null
+    if (principal.role != AdminRole.SUPER_ADMIN) {
+        respond(HttpStatusCode.Forbidden, ContentAdminErrorResponse("INSUFFICIENT_PERMISSION"))
+        return null
+    }
+    return principal
+}
+
+private suspend inline fun <reified T : Any> ApplicationCall.receiveContentRequest(): T? =
+    try {
+        receive<T>()
+    } catch (_: BadRequestException) {
+        respondContentValidationError()
+        null
+    }
+
+private suspend fun ApplicationCall.respondContentError(block: suspend () -> Unit) {
+    try {
+        block()
+    } catch (exception: ContentException) {
+        val status = when (exception.code) {
+            ContentErrorCode.VALIDATION_ERROR -> HttpStatusCode.BadRequest
+            ContentErrorCode.CONTENT_SKILL_NOT_FOUND,
+            ContentErrorCode.CONTENT_HINT_PACK_NOT_FOUND,
+            -> HttpStatusCode.NotFound
+            ContentErrorCode.CONTENT_SKILL_CONFLICT -> HttpStatusCode.Conflict
+        }
+        respond(status, ContentAdminErrorResponse(exception.code.name))
+    }
+}
+
+private suspend fun ApplicationCall.respondContentValidationError() {
+    respond(HttpStatusCode.BadRequest, ContentAdminErrorResponse(ContentErrorCode.VALIDATION_ERROR.name))
+}
+
+@Serializable
+private data class ContentAdminErrorResponse(val code: String)
diff --git a/src/main/kotlin/com/osglab/account/features/admin/routes/AdminRoutes.kt b/src/main/kotlin/com/osglab/account/features/admin/routes/AdminRoutes.kt
index 5510dca..75aeff4 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/routes/AdminRoutes.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/routes/AdminRoutes.kt
@@ -45,6 +45,7 @@ import com.osglab.account.features.credits.domain.CreditConflict
 import com.osglab.account.features.credits.domain.CreditNotFound
 import com.osglab.account.features.credits.domain.InvalidCreditRequest
 import com.osglab.account.features.credits.domain.LedgerEntryType
+import com.osglab.account.features.content.services.ContentService
 import io.ktor.http.Cookie
 import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpStatusCode
@@ -91,6 +92,7 @@ fun Route.adminApiRoutes(
     grantService: AdminGrantService,
     operatorService: AdminOperatorService,
     auditService: AdminAuditService,
+    contentService: ContentService? = null,
     clock: Clock = Clock.systemUTC(),
 ) {
     route("/v1/admin") {
@@ -166,6 +168,8 @@ fun Route.adminApiRoutes(
             }
         }
 
+        contentService?.let { adminContentRoutes(config, sessionService, it) }
+
         get("/overview") {
             if (call.requirePrincipal(config, sessionService) == null) return@get
             val stats = statsService.getRange(call.request.queryParameters["range"], clock)
@@ -814,7 +818,7 @@ private suspend fun ApplicationCall.requirePrincipal(
     return principal
 }
 
-private suspend fun ApplicationCall.requireRole(
+internal suspend fun ApplicationCall.requireRole(
     config: AppConfig,
     sessions: AdminSessionService,
     allowedRoles: Set<AdminRole>,
@@ -827,7 +831,7 @@ private suspend fun ApplicationCall.requireRole(
     return principal
 }
 
-private suspend fun ApplicationCall.requireMutationPrincipal(
+internal suspend fun ApplicationCall.requireMutationPrincipal(
     config: AppConfig,
     sessions: AdminSessionService,
 ): AdminPrincipal? {
@@ -949,7 +953,7 @@ private fun AdminStatsDto.toOverviewResponse(): AdminOverviewResponse {
         activeUsers = overview.activeUsers,
         newUsers = overview.registrations,
         totalCreditBalance = overview.totalCreditBalance,
-        creditsGranted = overview.issuedCredits,
+        creditsGranted = overview.grantedCredits,
         creditsUsed = overview.consumedCredits,
         trend = registrationTrend.map {
             AdminTrendResponse(
diff --git a/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminProductAnalyticsDtos.kt b/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminProductAnalyticsDtos.kt
index c58ece5..110fa30 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminProductAnalyticsDtos.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminProductAnalyticsDtos.kt
@@ -97,6 +97,27 @@ data class AdminAnalyticsGuardrailsDto(
     val creditBlockedUsers: Long,
 )
 
+@Serializable
+data class AdminAnalyticsKeyboardUsageDto(
+    val activeUsers: Long,
+    val activationToInput: AdminAnalyticsRateDto,
+    val chineseActiveUsers: Long,
+    val englishActiveUsers: Long,
+    val bilingualActiveUsers: Long,
+    val totalCharacters: Long,
+    val chineseCharacters: Long,
+    val englishCharacters: Long,
+    val otherCharacters: Long,
+    val chineseSharePercent: Double?,
+    val englishSharePercent: Double?,
+    val inputSessions: Long,
+    val averageCharactersPerInputSession: Double?,
+    val chineseOnlySessions: Long,
+    val englishOnlySessions: Long,
+    val mixedLanguageSessions: Long,
+    val otherOnlySessions: Long,
+)
+
 @Serializable
 data class AdminProductAnalyticsDto(
     val period: AdminAnalyticsPeriodDto,
@@ -108,6 +129,7 @@ data class AdminProductAnalyticsDto(
     val growthFunnel: List<AdminAnalyticsFunnelStepDto>,
     val retention: List<AdminAnalyticsCohortDto>,
     val aiFeatures: List<AdminAnalyticsFeatureUsageDto>,
+    val keyboardUsage: AdminAnalyticsKeyboardUsageDto,
     val referralFunnel: List<AdminAnalyticsFunnelStepDto>,
     val guardrails: AdminAnalyticsGuardrailsDto,
 )
diff --git a/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminStatsDtos.kt b/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminStatsDtos.kt
index 2d99eab..149333b 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminStatsDtos.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/stats/models/AdminStatsDtos.kt
@@ -14,7 +14,7 @@ data class AdminOverviewDto(
     val registrations: Long,
     val activeUsers: Long,
     val totalCreditBalance: Long,
-    val issuedCredits: Long,
+    val grantedCredits: Long,
     val consumedCredits: Long,
 )
 
@@ -27,7 +27,7 @@ data class AdminRegistrationPointDto(
 @Serializable
 data class AdminCreditFlowPointDto(
     val date: String,
-    val issuedCredits: Long,
+    val grantedCredits: Long,
     val consumedCredits: Long,
 )
 
diff --git a/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminProductAnalyticsRepository.kt b/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminProductAnalyticsRepository.kt
index b1aede0..949ccf3 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminProductAnalyticsRepository.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminProductAnalyticsRepository.kt
@@ -74,6 +74,23 @@ data class AdminAnalyticsGuardrailRow(
     val creditBlockedUsers: Long,
 )
 
+data class AdminAnalyticsKeyboardUsageRow(
+    val activeUsers: Long,
+    val keyboardUsers: Long,
+    val chineseActiveUsers: Long,
+    val englishActiveUsers: Long,
+    val bilingualActiveUsers: Long,
+    val totalCharacters: Long,
+    val chineseCharacters: Long,
+    val englishCharacters: Long,
+    val otherCharacters: Long,
+    val inputSessions: Long,
+    val chineseOnlySessions: Long,
+    val englishOnlySessions: Long,
+    val mixedLanguageSessions: Long,
+    val otherOnlySessions: Long,
+)
+
 data class AdminAnalyticsGrowthFunnelRow(
     val opened: Long,
     val registered: Long,
@@ -100,6 +117,7 @@ data class AdminProductAnalyticsSnapshot(
     val growthFunnel: AdminAnalyticsGrowthFunnelRow,
     val retention: List<AdminAnalyticsCohortRow>,
     val features: List<AdminAnalyticsFeatureRow>,
+    val keyboardUsage: AdminAnalyticsKeyboardUsageRow,
     val referrals: AdminAnalyticsReferralRow,
     val guardrails: AdminAnalyticsGuardrailRow,
 )
@@ -145,6 +163,7 @@ class ExposedAdminProductAnalyticsRepository(
             growthFunnel = loadGrowthFunnel(range),
             retention = loadRetention(range),
             features = loadFeatures(range),
+            keyboardUsage = loadKeyboardUsage(range),
             referrals = loadReferrals(range),
             guardrails = loadGuardrails(range),
         )
@@ -626,6 +645,96 @@ class ExposedAdminProductAnalyticsRepository(
             )
         }
 
+    private fun loadKeyboardUsage(range: AdminAnalyticsWindow): AdminAnalyticsKeyboardUsageRow =
+        querySingle(
+            """
+            WITH identity_usage AS (
+                SELECT
+                    COALESCE(
+                        CONCAT('a:', i.account_id),
+                        CONCAT('i:', s.installation_hash)
+                    ) AS identity_key,
+                    SUM(s.chinese_character_count) AS chinese_characters,
+                    SUM(s.english_character_count) AS english_characters,
+                    SUM(s.other_character_count) AS other_characters,
+                    SUM(s.input_session_count) AS input_sessions,
+                    SUM(s.chinese_only_session_count) AS chinese_only_sessions,
+                    SUM(s.english_only_session_count) AS english_only_sessions,
+                    SUM(s.mixed_language_session_count) AS mixed_language_sessions,
+                    SUM(s.other_only_session_count) AS other_only_sessions
+                FROM keyboard_usage_daily_summaries s
+                JOIN product_analytics_installations i
+                  ON i.installation_hash = s.installation_hash
+                WHERE s.summary_date >= DATE(?) AND s.summary_date < DATE(?)
+                GROUP BY identity_key
+            ),
+            activated AS (
+                SELECT DISTINCT
+                    COALESCE(
+                        CONCAT('a:', i.account_id),
+                        CONCAT('i:', e.installation_hash)
+                    ) AS identity_key
+                FROM product_analytics_events e
+                JOIN product_analytics_installations i
+                  ON i.installation_hash = e.installation_hash
+                WHERE e.event_name = 'KEYBOARD_ACTIVATED'
+                  AND e.occurred_at >= DATE(?) AND e.occurred_at < DATE(?)
+            ),
+            keyboard_population AS (
+                SELECT identity_key FROM identity_usage
+                UNION
+                SELECT identity_key FROM activated
+            )
+            SELECT
+                (SELECT COUNT(*) FROM identity_usage) AS active_users,
+                (SELECT COUNT(*) FROM keyboard_population) AS keyboard_users,
+                COALESCE(SUM(CASE WHEN chinese_characters > 0 THEN 1 ELSE 0 END), 0)
+                    AS chinese_active_users,
+                COALESCE(SUM(CASE WHEN english_characters > 0 THEN 1 ELSE 0 END), 0)
+                    AS english_active_users,
+                COALESCE(
+                    SUM(
+                        CASE
+                            WHEN chinese_characters > 0 AND english_characters > 0
+                            THEN 1 ELSE 0
+                        END
+                    ),
+                    0
+                ) AS bilingual_active_users,
+                COALESCE(
+                    SUM(chinese_characters + english_characters + other_characters),
+                    0
+                ) AS total_characters,
+                COALESCE(SUM(chinese_characters), 0) AS chinese_characters,
+                COALESCE(SUM(english_characters), 0) AS english_characters,
+                COALESCE(SUM(other_characters), 0) AS other_characters,
+                COALESCE(SUM(input_sessions), 0) AS input_sessions,
+                COALESCE(SUM(chinese_only_sessions), 0) AS chinese_only_sessions,
+                COALESCE(SUM(english_only_sessions), 0) AS english_only_sessions,
+                COALESCE(SUM(mixed_language_sessions), 0) AS mixed_language_sessions,
+                COALESCE(SUM(other_only_sessions), 0) AS other_only_sessions
+            FROM identity_usage
+            """,
+            range.arguments(repetitions = 2),
+        ) {
+            AdminAnalyticsKeyboardUsageRow(
+                activeUsers = it.exactLong("active_users"),
+                keyboardUsers = it.exactLong("keyboard_users"),
+                chineseActiveUsers = it.exactLong("chinese_active_users"),
+                englishActiveUsers = it.exactLong("english_active_users"),
+                bilingualActiveUsers = it.exactLong("bilingual_active_users"),
+                totalCharacters = it.exactLong("total_characters"),
+                chineseCharacters = it.exactLong("chinese_characters"),
+                englishCharacters = it.exactLong("english_characters"),
+                otherCharacters = it.exactLong("other_characters"),
+                inputSessions = it.exactLong("input_sessions"),
+                chineseOnlySessions = it.exactLong("chinese_only_sessions"),
+                englishOnlySessions = it.exactLong("english_only_sessions"),
+                mixedLanguageSessions = it.exactLong("mixed_language_sessions"),
+                otherOnlySessions = it.exactLong("other_only_sessions"),
+            )
+        }
+
     private fun loadReferrals(range: AdminAnalyticsWindow): AdminAnalyticsReferralRow =
         querySingle(
             valueEventsCte() +
diff --git a/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminStatsRepository.kt b/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminStatsRepository.kt
index 1c30b43..30557ae 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminStatsRepository.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/stats/repositories/AdminStatsRepository.kt
@@ -5,6 +5,7 @@ import com.osglab.account.features.admin.stats.models.AdminOverviewDto
 import com.osglab.account.features.admin.stats.models.AdminReferralFunnelDto
 import com.osglab.account.features.admin.stats.models.AdminReferralRankDto
 import com.osglab.account.features.admin.stats.models.AdminUsageAggregateDto
+import com.osglab.account.features.credits.domain.LedgerEntryType
 import org.jetbrains.exposed.v1.core.IColumnType
 import org.jetbrains.exposed.v1.javatime.JavaInstantColumnType
 import org.jetbrains.exposed.v1.jdbc.transactions.TransactionManager
@@ -25,7 +26,7 @@ data class AdminStatsRange(
 data class AdminStatsSnapshot(
     val overview: AdminOverviewDto,
     val registrationsByDate: Map<LocalDate, Long>,
-    val issuedCreditsByDate: Map<LocalDate, Long>,
+    val grantedCreditsByDate: Map<LocalDate, Long>,
     val consumedCreditsByDate: Map<LocalDate, Long>,
     val referralFunnel: AdminReferralFunnelDto,
     val referralRanking: List<AdminReferralRankDto>,
@@ -39,7 +40,7 @@ fun interface AdminStatsRepository {
 internal data class AdminStatsAggregates(
     val overview: AdminOverviewDto,
     val registrationsByDate: Map<LocalDate, Long>,
-    val issuedCreditsByDate: Map<LocalDate, Long>,
+    val grantedCreditsByDate: Map<LocalDate, Long>,
     val consumedCreditsByDate: Map<LocalDate, Long>,
     val referralFunnel: AdminReferralFunnelDto,
     val referralBindingsByInviter: List<ReferralBindingAggregateRow>,
@@ -73,17 +74,14 @@ class ExposedAdminStatsRepository(
                 """,
                 range,
             ),
-            issuedCreditsByDate = loadDailyAggregates(
+            grantedCreditsByDate = loadDailyAggregates(
                 """
                 SELECT DATE(created_at) AS aggregate_date,
                        COALESCE(SUM(amount_delta), 0) AS aggregate_value
                 FROM credit_ledger
                 WHERE created_at >= ? AND created_at < ?
                   AND amount_delta > 0
-                  AND entry_type IN (
-                      'SIGNUP_TRIAL', 'MANUAL_GRANT', 'REFERRAL_INVITER',
-                      'REFERRAL_INVITEE', 'STOREKIT_PURCHASE', 'SUBSCRIPTION_GRANT'
-                  )
+                  AND entry_type IN ($GRANTED_CREDIT_ENTRY_TYPES_SQL)
                 GROUP BY DATE(created_at)
                 """,
                 range,
@@ -128,11 +126,8 @@ class ExposedAdminStatsRepository(
                     FROM credit_ledger
                     WHERE created_at >= ? AND created_at < ?
                       AND amount_delta > 0
-                      AND entry_type IN (
-                          'SIGNUP_TRIAL', 'MANUAL_GRANT', 'REFERRAL_INVITER',
-                          'REFERRAL_INVITEE', 'STOREKIT_PURCHASE', 'SUBSCRIPTION_GRANT'
-                      )
-                ) AS issued_credits,
+                      AND entry_type IN ($GRANTED_CREDIT_ENTRY_TYPES_SQL)
+                ) AS granted_credits,
                 (
                     SELECT COALESCE(SUM(charged_credits), 0)
                     FROM credit_usage_records
@@ -146,7 +141,7 @@ class ExposedAdminStatsRepository(
                 registrations = result.exactLong("registrations"),
                 activeUsers = result.exactLong("active_users"),
                 totalCreditBalance = result.exactLong("total_credit_balance"),
-                issuedCredits = result.exactLong("issued_credits"),
+                grantedCredits = result.exactLong("granted_credits"),
                 consumedCredits = result.exactLong("consumed_credits"),
             )
         }
@@ -280,7 +275,7 @@ internal fun assembleAdminStats(aggregates: AdminStatsAggregates): AdminStatsSna
     AdminStatsSnapshot(
         overview = aggregates.overview,
         registrationsByDate = aggregates.registrationsByDate,
-        issuedCreditsByDate = aggregates.issuedCreditsByDate,
+        grantedCreditsByDate = aggregates.grantedCreditsByDate,
         consumedCreditsByDate = aggregates.consumedCreditsByDate,
         referralFunnel = aggregates.referralFunnel,
         referralRanking = aggregates.referralBindingsByInviter.map { binding ->
@@ -332,3 +327,14 @@ private fun ResultSet.exactLong(column: String): Long =
 internal fun BigDecimal.toExactLong(): Long = longValueExact()
 
 private val INSTANT_COLUMN_TYPE = JavaInstantColumnType()
+
+internal val GRANTED_CREDIT_ENTRY_TYPES: Set<LedgerEntryType> = setOf(
+    LedgerEntryType.SIGNUP_TRIAL,
+    LedgerEntryType.MANUAL_GRANT,
+    LedgerEntryType.REFERRAL_INVITER,
+    LedgerEntryType.REFERRAL_INVITEE,
+    LedgerEntryType.SUBSCRIPTION_GRANT,
+)
+
+private val GRANTED_CREDIT_ENTRY_TYPES_SQL =
+    GRANTED_CREDIT_ENTRY_TYPES.joinToString(", ") { "'${it.name}'" }
diff --git a/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminProductAnalyticsService.kt b/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminProductAnalyticsService.kt
index 78adf04..c16ac22 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminProductAnalyticsService.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminProductAnalyticsService.kt
@@ -8,6 +8,7 @@ import com.osglab.account.features.admin.stats.models.AdminAnalyticsFeatureUsage
 import com.osglab.account.features.admin.stats.models.AdminAnalyticsFunnelStepDto
 import com.osglab.account.features.admin.stats.models.AdminAnalyticsGrowthDto
 import com.osglab.account.features.admin.stats.models.AdminAnalyticsGuardrailsDto
+import com.osglab.account.features.admin.stats.models.AdminAnalyticsKeyboardUsageDto
 import com.osglab.account.features.admin.stats.models.AdminAnalyticsMonetizationDto
 import com.osglab.account.features.admin.stats.models.AdminAnalyticsNorthStarDto
 import com.osglab.account.features.admin.stats.models.AdminAnalyticsPeriodDto
@@ -42,6 +43,8 @@ class AdminProductAnalyticsService(
         )
         val referrals = snapshot.referrals
         val growth = snapshot.growthFunnel
+        val keyboard = snapshot.keyboardUsage
+        val classifiedKeyboardCharacters = keyboard.chineseCharacters + keyboard.englishCharacters
         return AdminProductAnalyticsDto(
             period = AdminAnalyticsPeriodDto(from.toString(), until.toString()),
             northStar = AdminAnalyticsNorthStarDto(
@@ -126,6 +129,37 @@ class AdminProductAnalyticsService(
                     successes = it.successes,
                 )
             },
+            keyboardUsage = AdminAnalyticsKeyboardUsageDto(
+                activeUsers = keyboard.activeUsers,
+                activationToInput = AdminAnalyticsCountRow(
+                    keyboard.activeUsers,
+                    keyboard.keyboardUsers,
+                ).toRate(),
+                chineseActiveUsers = keyboard.chineseActiveUsers,
+                englishActiveUsers = keyboard.englishActiveUsers,
+                bilingualActiveUsers = keyboard.bilingualActiveUsers,
+                totalCharacters = keyboard.totalCharacters,
+                chineseCharacters = keyboard.chineseCharacters,
+                englishCharacters = keyboard.englishCharacters,
+                otherCharacters = keyboard.otherCharacters,
+                chineseSharePercent = percentage(
+                    keyboard.chineseCharacters,
+                    classifiedKeyboardCharacters,
+                ),
+                englishSharePercent = percentage(
+                    keyboard.englishCharacters,
+                    classifiedKeyboardCharacters,
+                ),
+                inputSessions = keyboard.inputSessions,
+                averageCharactersPerInputSession = ratio(
+                    keyboard.totalCharacters,
+                    keyboard.inputSessions,
+                ),
+                chineseOnlySessions = keyboard.chineseOnlySessions,
+                englishOnlySessions = keyboard.englishOnlySessions,
+                mixedLanguageSessions = keyboard.mixedLanguageSessions,
+                otherOnlySessions = keyboard.otherOnlySessions,
+            ),
             referralFunnel = listOf(
                 AdminAnalyticsFunnelStepDto("发起分享", referrals.shared),
                 AdminAnalyticsFunnelStepDto("打开邀请", referrals.opened),
diff --git a/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminStatsService.kt b/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminStatsService.kt
index 5638f78..4f9b465 100644
--- a/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminStatsService.kt
+++ b/src/main/kotlin/com/osglab/account/features/admin/stats/services/AdminStatsService.kt
@@ -45,7 +45,7 @@ class AdminStatsService(
             creditFlow = dates.map { date ->
                 AdminCreditFlowPointDto(
                     date = date.toString(),
-                    issuedCredits = snapshot.issuedCreditsByDate[date] ?: 0,
+                    grantedCredits = snapshot.grantedCreditsByDate[date] ?: 0,
                     consumedCredits = snapshot.consumedCreditsByDate[date] ?: 0,
                 )
             },
diff --git a/src/main/kotlin/com/osglab/account/features/analytics/domain/AnalyticsDomain.kt b/src/main/kotlin/com/osglab/account/features/analytics/domain/AnalyticsDomain.kt
index fba305a..bc95fc6 100644
--- a/src/main/kotlin/com/osglab/account/features/analytics/domain/AnalyticsDomain.kt
+++ b/src/main/kotlin/com/osglab/account/features/analytics/domain/AnalyticsDomain.kt
@@ -3,6 +3,7 @@ package com.osglab.account.features.analytics.domain
 import com.osglab.account.common.errors.ApiException
 import io.ktor.http.HttpStatusCode
 import java.time.Instant
+import java.time.LocalDate
 import java.util.UUID
 import kotlinx.serialization.Serializable
 
@@ -105,9 +106,44 @@ data class AnalyticsIngestResult(
     val replayed: Int,
 )
 
+data class KeyboardUsageSummary(
+    val clientSummaryId: UUID,
+    val summaryDate: LocalDate,
+    val chineseCharacterCount: Long,
+    val englishCharacterCount: Long,
+    val otherCharacterCount: Long,
+    val inputSessionCount: Long,
+    val chineseOnlySessionCount: Long,
+    val englishOnlySessionCount: Long,
+    val mixedLanguageSessionCount: Long,
+    val otherOnlySessionCount: Long,
+    val appVersion: String?,
+    val osVersion: String?,
+    val payloadHash: String,
+) {
+    override fun toString(): String = "KeyboardUsageSummary([REDACTED])"
+}
+
+data class KeyboardUsageBatch(
+    val installationHash: String,
+    val accountId: UUID?,
+    val summaries: List<KeyboardUsageSummary>,
+    val receivedAt: Instant,
+) {
+    override fun toString(): String =
+        "KeyboardUsageBatch(installationHash=[REDACTED], accountId=[REDACTED], summaries=${summaries.size})"
+}
+
 class AnalyticsEventTimeException :
     ApiException(
         status = HttpStatusCode.UnprocessableEntity,
         code = "event_time_invalid",
         message = "An event timestamp is outside the accepted range",
     )
+
+class KeyboardUsageDateException :
+    ApiException(
+        status = HttpStatusCode.UnprocessableEntity,
+        code = "summary_date_invalid",
+        message = "A keyboard usage summary date is outside the accepted range",
+    )
diff --git a/src/main/kotlin/com/osglab/account/features/analytics/models/AnalyticsDtos.kt b/src/main/kotlin/com/osglab/account/features/analytics/models/AnalyticsDtos.kt
index 1d908bc..e8ba816 100644
--- a/src/main/kotlin/com/osglab/account/features/analytics/models/AnalyticsDtos.kt
+++ b/src/main/kotlin/com/osglab/account/features/analytics/models/AnalyticsDtos.kt
@@ -36,6 +36,33 @@ data class AnalyticsEventRequest(
     override fun toString(): String = "AnalyticsEventRequest([REDACTED])"
 }
 
+@Serializable
+data class KeyboardUsageBatchRequest(
+    val installationId: String,
+    val summaries: List<KeyboardUsageSummaryRequest>,
+) {
+    override fun toString(): String =
+        "KeyboardUsageBatchRequest(installationId=[REDACTED], summaries=[REDACTED size=${summaries.size}])"
+}
+
+@Serializable
+data class KeyboardUsageSummaryRequest(
+    val clientSummaryId: String,
+    val summaryDate: String,
+    val chineseCharacterCount: Long,
+    val englishCharacterCount: Long,
+    val otherCharacterCount: Long,
+    val inputSessionCount: Long,
+    val chineseOnlySessionCount: Long,
+    val englishOnlySessionCount: Long,
+    val mixedLanguageSessionCount: Long,
+    val otherOnlySessionCount: Long,
+    val appVersion: String? = null,
+    val osVersion: String? = null,
+) {
+    override fun toString(): String = "KeyboardUsageSummaryRequest([REDACTED])"
+}
+
 @Serializable
 data class AnalyticsIngestResponse(
     val accepted: Int,
diff --git a/src/main/kotlin/com/osglab/account/features/analytics/repositories/AnalyticsRepository.kt b/src/main/kotlin/com/osglab/account/features/analytics/repositories/AnalyticsRepository.kt
index 9ba0db8..474ee12 100644
--- a/src/main/kotlin/com/osglab/account/features/analytics/repositories/AnalyticsRepository.kt
+++ b/src/main/kotlin/com/osglab/account/features/analytics/repositories/AnalyticsRepository.kt
@@ -12,12 +12,17 @@ import com.osglab.account.features.analytics.domain.AnalyticsFailureCategory
 import com.osglab.account.features.analytics.domain.AnalyticsFeature
 import com.osglab.account.features.analytics.domain.AnalyticsIngestResult
 import com.osglab.account.features.analytics.domain.AnalyticsSurface
+import com.osglab.account.features.analytics.domain.KeyboardUsageBatch
+import com.osglab.account.features.analytics.domain.KeyboardUsageSummary
+import kotlinx.coroutines.delay
+import org.jetbrains.exposed.v1.exceptions.ExposedSQLException
 import org.jetbrains.exposed.v1.core.Table
 import org.jetbrains.exposed.v1.core.and
 import org.jetbrains.exposed.v1.core.eq
 import org.jetbrains.exposed.v1.core.inList
 import org.jetbrains.exposed.v1.core.isNull
 import org.jetbrains.exposed.v1.core.less
+import org.jetbrains.exposed.v1.core.or
 import org.jetbrains.exposed.v1.core.plus
 import org.jetbrains.exposed.v1.javatime.date
 import org.jetbrains.exposed.v1.javatime.timestamp
@@ -27,17 +32,37 @@ import org.jetbrains.exposed.v1.jdbc.deleteWhere
 import org.jetbrains.exposed.v1.jdbc.selectAll
 import org.jetbrains.exposed.v1.jdbc.update
 import java.time.Instant
+import java.time.LocalDate
 import java.time.ZoneOffset
+import java.sql.SQLException
 
 interface AnalyticsRepository {
     suspend fun ingest(batch: AnalyticsBatch): AnalyticsIngestResult
+    suspend fun ingestKeyboardUsage(batch: KeyboardUsageBatch): AnalyticsIngestResult
     suspend fun recordInvitePageOpen(occurredAt: Instant)
     suspend fun purgeAnonymousInstallations(before: Instant, limit: Int): Int
+    suspend fun purgeKeyboardUsageSummaries(before: LocalDate, limit: Int): Int
 }
 
 class ExposedAnalyticsRepository(
     private val databaseFactory: DatabaseFactory,
 ) : AnalyticsRepository {
+    override suspend fun purgeKeyboardUsageSummaries(before: LocalDate, limit: Int): Int {
+        require(limit in 1..10_000)
+        return databaseFactory.query {
+            val ids = KeyboardUsageSummaries
+                .selectAll()
+                .where { KeyboardUsageSummaries.summaryDate less before }
+                .limit(limit)
+                .map { it[KeyboardUsageSummaries.id] }
+            if (ids.isEmpty()) {
+                0
+            } else {
+                KeyboardUsageSummaries.deleteWhere { KeyboardUsageSummaries.id inList ids }
+            }
+        }
+    }
+
     override suspend fun purgeAnonymousInstallations(before: Instant, limit: Int): Int {
         require(limit in 1..10_000)
         return databaseFactory.query {
@@ -79,36 +104,8 @@ class ExposedAnalyticsRepository(
     }
 
     override suspend fun ingest(batch: AnalyticsBatch): AnalyticsIngestResult =
-        databaseFactory.query {
-            AnalyticsInstallations.insertIgnore {
-                it[installationHash] = batch.installationHash
-                it[accountId] = batch.accountId?.toString()
-                it[createdAt] = batch.receivedAt
-                it[updatedAt] = batch.receivedAt
-            }
-
-            val installation = AnalyticsInstallations
-                .selectAll()
-                .where { AnalyticsInstallations.installationHash eq batch.installationHash }
-                .forUpdate()
-                .single()
-            val linkedAccount = installation[AnalyticsInstallations.accountId]
-            when {
-                batch.accountId == null -> Unit
-                linkedAccount == null -> AnalyticsInstallations.update({
-                    AnalyticsInstallations.installationHash eq batch.installationHash
-                }) {
-                    it[accountId] = batch.accountId.toString()
-                    it[updatedAt] = batch.receivedAt
-                }
-                linkedAccount != batch.accountId.toString() ->
-                    throw ConflictException("Installation is linked to another account")
-            }
-            AnalyticsInstallations.update({
-                AnalyticsInstallations.installationHash eq batch.installationHash
-            }) {
-                it[updatedAt] = batch.receivedAt
-            }
+        ingestTransaction {
+            linkInstallation(batch.installationHash, batch.accountId?.toString(), batch.receivedAt)
 
             var accepted = 0
             var replayed = 0
@@ -133,6 +130,83 @@ class ExposedAnalyticsRepository(
             AnalyticsIngestResult(accepted = accepted, replayed = replayed)
         }
 
+    override suspend fun ingestKeyboardUsage(batch: KeyboardUsageBatch): AnalyticsIngestResult =
+        ingestTransaction {
+            linkInstallation(batch.installationHash, batch.accountId?.toString(), batch.receivedAt)
+
+            var accepted = 0
+            var replayed = 0
+            batch.summaries.forEach { summary ->
+                val existingPayloadHash = KeyboardUsageSummaries
+                    .selectAll()
+                    .where {
+                        (KeyboardUsageSummaries.installationHash eq batch.installationHash) and (
+                            (KeyboardUsageSummaries.clientSummaryId eq summary.clientSummaryId.toString()) or
+                                (KeyboardUsageSummaries.summaryDate eq summary.summaryDate)
+                            )
+                    }
+                    .singleOrNull()
+                    ?.get(KeyboardUsageSummaries.payloadHash)
+                when {
+                    existingPayloadHash == null -> {
+                        insertKeyboardUsageSummary(batch, summary)
+                        accepted += 1
+                    }
+                    existingPayloadHash == summary.payloadHash -> replayed += 1
+                    else -> throw ConflictException("Keyboard usage summary conflicts with an existing date or ID")
+                }
+            }
+            AnalyticsIngestResult(accepted = accepted, replayed = replayed)
+        }
+
+    private suspend fun <T> ingestTransaction(block: suspend () -> T): T {
+        repeat(MAX_INGEST_ATTEMPTS) { attempt ->
+            try {
+                return databaseFactory.query(block)
+            } catch (exception: ExposedSQLException) {
+                if (!exception.isDeadlock() || attempt == MAX_INGEST_ATTEMPTS - 1) throw exception
+                delay(DEADLOCK_RETRY_DELAY_MILLIS * (attempt + 1))
+            }
+        }
+        error("Unreachable analytics transaction retry state")
+    }
+
+    private fun linkInstallation(
+        installationHash: String,
+        accountId: String?,
+        receivedAt: Instant,
+    ) {
+        AnalyticsInstallations.insertIgnore {
+            it[AnalyticsInstallations.installationHash] = installationHash
+            it[AnalyticsInstallations.accountId] = accountId
+            it[createdAt] = receivedAt
+            it[updatedAt] = receivedAt
+        }
+
+        val installation = AnalyticsInstallations
+            .selectAll()
+            .where { AnalyticsInstallations.installationHash eq installationHash }
+            .forUpdate()
+            .single()
+        val linkedAccount = installation[AnalyticsInstallations.accountId]
+        when {
+            accountId == null -> Unit
+            linkedAccount == null -> AnalyticsInstallations.update({
+                AnalyticsInstallations.installationHash eq installationHash
+            }) {
+                it[AnalyticsInstallations.accountId] = accountId
+                it[updatedAt] = receivedAt
+            }
+            linkedAccount != accountId ->
+                throw ConflictException("Installation is linked to another account")
+        }
+        AnalyticsInstallations.update({
+            AnalyticsInstallations.installationHash eq installationHash
+        }) {
+            it[updatedAt] = receivedAt
+        }
+    }
+
     private fun insertEvent(batch: AnalyticsBatch, event: AnalyticsEvent) {
         AnalyticsEvents.insert {
             it[installationHash] = batch.installationHash
@@ -151,6 +225,29 @@ class ExposedAnalyticsRepository(
             it[receivedAt] = batch.receivedAt
         }
     }
+
+    private fun insertKeyboardUsageSummary(
+        batch: KeyboardUsageBatch,
+        summary: KeyboardUsageSummary,
+    ) {
+        KeyboardUsageSummaries.insert {
+            it[installationHash] = batch.installationHash
+            it[clientSummaryId] = summary.clientSummaryId.toString()
+            it[summaryDate] = summary.summaryDate
+            it[chineseCharacterCount] = summary.chineseCharacterCount
+            it[englishCharacterCount] = summary.englishCharacterCount
+            it[otherCharacterCount] = summary.otherCharacterCount
+            it[inputSessionCount] = summary.inputSessionCount
+            it[chineseOnlySessionCount] = summary.chineseOnlySessionCount
+            it[englishOnlySessionCount] = summary.englishOnlySessionCount
+            it[mixedLanguageSessionCount] = summary.mixedLanguageSessionCount
+            it[otherOnlySessionCount] = summary.otherOnlySessionCount
+            it[appVersion] = summary.appVersion
+            it[osVersion] = summary.osVersion
+            it[payloadHash] = summary.payloadHash
+            it[receivedAt] = batch.receivedAt
+        }
+    }
 }
 
 private object AnalyticsInstallations : Table("product_analytics_installations") {
@@ -185,6 +282,27 @@ private object AnalyticsEvents : Table("product_analytics_events") {
     override val primaryKey = PrimaryKey(installationHash, clientEventId)
 }
 
+private object KeyboardUsageSummaries : Table("keyboard_usage_daily_summaries") {
+    val id = long("id").autoIncrement()
+    val installationHash = char("installation_hash", 64)
+    val clientSummaryId = char("client_summary_id", 36)
+    val summaryDate = date("summary_date")
+    val chineseCharacterCount = long("chinese_character_count")
+    val englishCharacterCount = long("english_character_count")
+    val otherCharacterCount = long("other_character_count")
+    val inputSessionCount = long("input_session_count")
+    val chineseOnlySessionCount = long("chinese_only_session_count")
+    val englishOnlySessionCount = long("english_only_session_count")
+    val mixedLanguageSessionCount = long("mixed_language_session_count")
+    val otherOnlySessionCount = long("other_only_session_count")
+    val appVersion = varchar("app_version", 32).nullable()
+    val osVersion = varchar("os_version", 32).nullable()
+    val payloadHash = char("payload_hash", 64)
+    val receivedAt = timestamp("received_at")
+
+    override val primaryKey = PrimaryKey(id)
+}
+
 private object AnalyticsDailyCounters : Table("product_analytics_daily_counters") {
     val counterDate = date("counter_date")
     val counterName = varchar("counter_name", 32)
@@ -195,3 +313,12 @@ private object AnalyticsDailyCounters : Table("product_analytics_daily_counters"
 }
 
 private const val INVITE_PAGE_OPENED = "INVITE_PAGE_OPENED"
+private const val MAX_INGEST_ATTEMPTS = 4
+private const val DEADLOCK_RETRY_DELAY_MILLIS = 10L
+
+private fun ExposedSQLException.isDeadlock(): Boolean =
+    generateSequence<Throwable>(this) { it.cause }
+        .filterIsInstance<SQLException>()
+        .any { it.sqlState == "40001" || it.errorCode == MYSQL_DEADLOCK_ERROR_CODE }
+
+private const val MYSQL_DEADLOCK_ERROR_CODE = 1213
diff --git a/src/main/kotlin/com/osglab/account/features/analytics/routes/AnalyticsRoutes.kt b/src/main/kotlin/com/osglab/account/features/analytics/routes/AnalyticsRoutes.kt
index 2d09386..f8bfbe8 100644
--- a/src/main/kotlin/com/osglab/account/features/analytics/routes/AnalyticsRoutes.kt
+++ b/src/main/kotlin/com/osglab/account/features/analytics/routes/AnalyticsRoutes.kt
@@ -5,9 +5,11 @@ import com.osglab.account.common.security.SESSION_AUTH_NAME
 import com.osglab.account.common.errors.InvalidRequestException
 import com.osglab.account.features.analytics.models.AnalyticsBatchRequest
 import com.osglab.account.features.analytics.models.AnalyticsIngestResponse
+import com.osglab.account.features.analytics.models.KeyboardUsageBatchRequest
 import com.osglab.account.features.analytics.services.AnalyticsService
 import io.ktor.http.HttpStatusCode
 import io.ktor.http.HttpHeaders
+import io.ktor.server.application.ApplicationCall
 import io.ktor.server.auth.authenticate
 import io.ktor.server.auth.principal
 import io.ktor.server.request.header
@@ -21,25 +23,37 @@ import kotlinx.serialization.json.Json
 fun Route.analyticsRoutes(service: AnalyticsService) {
     authenticate(SESSION_AUTH_NAME, optional = true) {
         post("/v1/analytics/events") {
-            val declaredLength = call.request.header(HttpHeaders.ContentLength)?.toLongOrNull()
-            if (declaredLength != null && declaredLength > MAX_ANALYTICS_BODY_BYTES) {
-                throw InvalidRequestException("Analytics request body is too large")
-            }
-            val body = call.receiveText()
-            if (body.toByteArray(Charsets.UTF_8).size > MAX_ANALYTICS_BODY_BYTES) {
-                throw InvalidRequestException("Analytics request body is too large")
-            }
-            val request = try {
-                ANALYTICS_JSON.decodeFromString<AnalyticsBatchRequest>(body)
-            } catch (_: SerializationException) {
-                throw InvalidRequestException("Analytics request body is invalid")
-            }
+            val request = call.receiveAnalyticsBody<AnalyticsBatchRequest>()
             val result = service.ingest(
                 accountId = call.principal<AccountPrincipal>()?.userId,
                 request = request,
             )
             call.respond(HttpStatusCode.OK, AnalyticsIngestResponse.fromDomain(result))
         }
+        post("/v1/analytics/keyboard-usage") {
+            val request = call.receiveAnalyticsBody<KeyboardUsageBatchRequest>()
+            val result = service.ingestKeyboardUsage(
+                accountId = call.principal<AccountPrincipal>()?.userId,
+                request = request,
+            )
+            call.respond(HttpStatusCode.OK, AnalyticsIngestResponse.fromDomain(result))
+        }
+    }
+}
+
+private suspend inline fun <reified T> ApplicationCall.receiveAnalyticsBody(): T {
+    val declaredLength = request.header(HttpHeaders.ContentLength)?.toLongOrNull()
+    if (declaredLength != null && declaredLength > MAX_ANALYTICS_BODY_BYTES) {
+        throw InvalidRequestException("Analytics request body is too large")
+    }
+    val body = receiveText()
+    if (body.toByteArray(Charsets.UTF_8).size > MAX_ANALYTICS_BODY_BYTES) {
+        throw InvalidRequestException("Analytics request body is too large")
+    }
+    return try {
+        ANALYTICS_JSON.decodeFromString<T>(body)
+    } catch (_: SerializationException) {
+        throw InvalidRequestException("Analytics request body is invalid")
     }
 }
 
diff --git a/src/main/kotlin/com/osglab/account/features/analytics/services/AnalyticsService.kt b/src/main/kotlin/com/osglab/account/features/analytics/services/AnalyticsService.kt
index f3f70ba..28f95f8 100644
--- a/src/main/kotlin/com/osglab/account/features/analytics/services/AnalyticsService.kt
+++ b/src/main/kotlin/com/osglab/account/features/analytics/services/AnalyticsService.kt
@@ -9,13 +9,20 @@ import com.osglab.account.features.analytics.domain.AnalyticsEventType
 import com.osglab.account.features.analytics.domain.AnalyticsFailureCategory
 import com.osglab.account.features.analytics.domain.AnalyticsIngestResult
 import com.osglab.account.features.analytics.domain.AnalyticsSurface
+import com.osglab.account.features.analytics.domain.KeyboardUsageBatch
+import com.osglab.account.features.analytics.domain.KeyboardUsageDateException
+import com.osglab.account.features.analytics.domain.KeyboardUsageSummary
 import com.osglab.account.features.analytics.models.AnalyticsBatchRequest
 import com.osglab.account.features.analytics.models.AnalyticsEventRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageBatchRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageSummaryRequest
 import com.osglab.account.features.analytics.repositories.AnalyticsRepository
 import java.security.MessageDigest
 import java.time.Clock
 import java.time.Duration
 import java.time.Instant
+import java.time.LocalDate
+import java.time.ZoneOffset
 import java.time.format.DateTimeParseException
 import java.util.UUID
 
@@ -24,6 +31,11 @@ interface AnalyticsService {
         accountId: UUID?,
         request: AnalyticsBatchRequest,
     ): AnalyticsIngestResult
+
+    suspend fun ingestKeyboardUsage(
+        accountId: UUID?,
+        request: KeyboardUsageBatchRequest,
+    ): AnalyticsIngestResult
 }
 
 class DefaultAnalyticsService(
@@ -50,6 +62,89 @@ class DefaultAnalyticsService(
         )
     }
 
+    override suspend fun ingestKeyboardUsage(
+        accountId: UUID?,
+        request: KeyboardUsageBatchRequest,
+    ): AnalyticsIngestResult {
+        if (request.summaries.size !in MIN_BATCH_SIZE..MAX_BATCH_SIZE) {
+            throw InvalidRequestException("summaries must contain between 1 and 50 items")
+        }
+        val installationId = parseUuid(request.installationId, "installationId")
+        val now = clock.instant()
+        val today = now.atZone(ZoneOffset.UTC).toLocalDate()
+        val summaries = request.summaries.map { validateAndMap(it, today) }
+        if (summaries.map(KeyboardUsageSummary::summaryDate).toSet().size != summaries.size) {
+            throw InvalidRequestException("summaries must contain at most one item per UTC date")
+        }
+        return repository.ingestKeyboardUsage(
+            KeyboardUsageBatch(
+                installationHash = installationId.toString().sha256Hex(),
+                accountId = accountId,
+                summaries = summaries,
+                receivedAt = now,
+            )
+        )
+    }
+
+    private fun validateAndMap(
+        request: KeyboardUsageSummaryRequest,
+        today: LocalDate,
+    ): KeyboardUsageSummary {
+        val clientSummaryId = parseUuid(request.clientSummaryId, "clientSummaryId")
+        val summaryDate = parseSummaryDate(request.summaryDate)
+        if (summaryDate.isBefore(today.minusDays(MAX_SUMMARY_AGE_DAYS)) || !summaryDate.isBefore(today)) {
+            throw KeyboardUsageDateException()
+        }
+        validateReleaseIdentifier(request.appVersion, "appVersion")
+        validateReleaseIdentifier(request.osVersion, "osVersion")
+        validateKeyboardUsageCounts(request)
+        return KeyboardUsageSummary(
+            clientSummaryId = clientSummaryId,
+            summaryDate = summaryDate,
+            chineseCharacterCount = request.chineseCharacterCount,
+            englishCharacterCount = request.englishCharacterCount,
+            otherCharacterCount = request.otherCharacterCount,
+            inputSessionCount = request.inputSessionCount,
+            chineseOnlySessionCount = request.chineseOnlySessionCount,
+            englishOnlySessionCount = request.englishOnlySessionCount,
+            mixedLanguageSessionCount = request.mixedLanguageSessionCount,
+            otherOnlySessionCount = request.otherOnlySessionCount,
+            appVersion = request.appVersion,
+            osVersion = request.osVersion,
+            payloadHash = keyboardUsagePayloadHash(request, clientSummaryId, summaryDate),
+        )
+    }
+
+    private fun validateKeyboardUsageCounts(request: KeyboardUsageSummaryRequest) {
+        val characterCounts = listOf(
+            request.chineseCharacterCount,
+            request.englishCharacterCount,
+            request.otherCharacterCount,
+        )
+        val partitionedSessionCounts = listOf(
+            request.chineseOnlySessionCount,
+            request.englishOnlySessionCount,
+            request.mixedLanguageSessionCount,
+            request.otherOnlySessionCount,
+        )
+        if (characterCounts.any { it !in 0..MAX_DAILY_CHARACTER_COUNT }) {
+            throw InvalidRequestException("character counts must be between 0 and 1000000")
+        }
+        if (
+            request.inputSessionCount !in 1..MAX_DAILY_SESSION_COUNT ||
+            partitionedSessionCounts.any { it !in 0..MAX_DAILY_SESSION_COUNT }
+        ) {
+            throw InvalidRequestException("session counts must be between 0 and 100000")
+        }
+        val totalCharacters = characterCounts.sum()
+        if (totalCharacters == 0L || totalCharacters < request.inputSessionCount) {
+            throw InvalidRequestException("each input session must contain a committed character")
+        }
+        if (partitionedSessionCounts.sum() != request.inputSessionCount) {
+            throw InvalidRequestException("language session counts must equal inputSessionCount")
+        }
+    }
+
     private fun validateAndMap(request: AnalyticsEventRequest, now: Instant): AnalyticsEvent {
         val clientEventId = parseUuid(request.clientEventId, "clientEventId")
         val occurredAt = parseOccurredAt(request.occurredAt)
@@ -175,6 +270,13 @@ class DefaultAnalyticsService(
         }
     }
 
+    private fun parseSummaryDate(value: String): LocalDate =
+        try {
+            LocalDate.parse(value)
+        } catch (_: DateTimeParseException) {
+            throw InvalidRequestException("summaryDate must be a UTC ISO-8601 date")
+        }
+
     private fun validateReleaseIdentifier(value: String?, field: String) {
         if (value != null && !RELEASE_IDENTIFIER.matches(value)) {
             throw InvalidRequestException("$field must be a 1 to 32 character release identifier")
@@ -210,6 +312,25 @@ class DefaultAnalyticsService(
         event.osVersion,
     ).joinToString(separator = "\u0000") { it ?: "" }.sha256Hex()
 
+    private fun keyboardUsagePayloadHash(
+        summary: KeyboardUsageSummaryRequest,
+        clientSummaryId: UUID,
+        summaryDate: LocalDate,
+    ): String = listOf(
+        clientSummaryId.toString(),
+        summaryDate.toString(),
+        summary.chineseCharacterCount,
+        summary.englishCharacterCount,
+        summary.otherCharacterCount,
+        summary.inputSessionCount,
+        summary.chineseOnlySessionCount,
+        summary.englishOnlySessionCount,
+        summary.mixedLanguageSessionCount,
+        summary.otherOnlySessionCount,
+        summary.appVersion,
+        summary.osVersion,
+    ).joinToString(separator = "\u0000") { it?.toString() ?: "" }.sha256Hex()
+
     private fun String.sha256Hex(): String =
         MessageDigest.getInstance("SHA-256")
             .digest(toByteArray(Charsets.UTF_8))
@@ -218,6 +339,9 @@ class DefaultAnalyticsService(
     private companion object {
         const val MIN_BATCH_SIZE = 1
         const val MAX_BATCH_SIZE = 50
+        const val MAX_SUMMARY_AGE_DAYS = 35L
+        const val MAX_DAILY_CHARACTER_COUNT = 1_000_000L
+        const val MAX_DAILY_SESSION_COUNT = 100_000L
         val MAX_EVENT_AGE: Duration = Duration.ofDays(35)
         val MAX_FUTURE_SKEW: Duration = Duration.ofMinutes(5)
         val UUID_PATTERN =
@@ -235,11 +359,17 @@ class AnalyticsMaintenanceService(
         require(!anonymousRetention.isNegative && !anonymousRetention.isZero)
     }
 
-    suspend fun purgeStaleAnonymousInstallations(): Int =
-        repository.purgeAnonymousInstallations(
-            before = clock.instant().minus(anonymousRetention),
+    suspend fun purgeStaleAnonymousInstallations(): Int {
+        val retentionCutoff = clock.instant().minus(anonymousRetention)
+        repository.purgeKeyboardUsageSummaries(
+            before = retentionCutoff.atZone(ZoneOffset.UTC).toLocalDate(),
             limit = PURGE_BATCH_SIZE,
         )
+        return repository.purgeAnonymousInstallations(
+            before = retentionCutoff,
+            limit = PURGE_BATCH_SIZE,
+        )
+    }
 
     private companion object {
         const val PURGE_BATCH_SIZE = 1_000
diff --git a/src/main/kotlin/com/osglab/account/features/content/models/ContentModels.kt b/src/main/kotlin/com/osglab/account/features/content/models/ContentModels.kt
new file mode 100644
index 0000000..9927993
--- /dev/null
+++ b/src/main/kotlin/com/osglab/account/features/content/models/ContentModels.kt
@@ -0,0 +1,154 @@
+package com.osglab.account.features.content.models
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonObject
+import java.time.Instant
+
+@Serializable
+data class SkillLocalizationDto(
+    val name: String,
+    val summary: String,
+    val prompt: String,
+)
+
+@Serializable
+data class SkillLocalizationsDto(
+    @SerialName("zh-Hans")
+    val zhHans: SkillLocalizationDto,
+    val en: SkillLocalizationDto,
+)
+
+@Serializable
+data class OfficialSkillDto(
+    val id: String,
+    val systemImage: String,
+    val sortOrder: Int,
+    val kind: String = "transform",
+    val thinkingEnabled: Boolean,
+    val localizations: SkillLocalizationsDto,
+)
+
+@Serializable
+data class AdminOfficialSkillDto(
+    val id: String,
+    val systemImage: String,
+    val sortOrder: Int,
+    val kind: String = "transform",
+    val thinkingEnabled: Boolean,
+    val enabled: Boolean,
+    val localizations: SkillLocalizationsDto,
+)
+
+@Serializable
+data class CreateOfficialSkillRequest(
+    val id: String,
+    val systemImage: String,
+    val sortOrder: Int,
+    val thinkingEnabled: Boolean,
+    val localizations: SkillLocalizationsDto,
+)
+
+@Serializable
+data class UpdateOfficialSkillRequest(
+    val systemImage: String,
+    val sortOrder: Int,
+    val thinkingEnabled: Boolean,
+    val localizations: SkillLocalizationsDto,
+)
+
+@Serializable
+data class SkillCatalogResponse(
+    val schemaVersion: Int = 1,
+    val revision: Long,
+    val generatedAt: String? = null,
+    val skills: List<OfficialSkillDto>,
+)
+
+@Serializable
+data class AdminSkillCatalogResponse(
+    val revision: Long,
+    val generatedAt: String? = null,
+    val skills: List<AdminOfficialSkillDto>,
+)
+
+data class OfficialSkillRecord(
+    val id: String,
+    val systemImage: String,
+    val sortOrder: Int,
+    val thinkingEnabled: Boolean,
+    val enabled: Boolean,
+    val localizations: SkillLocalizationsDto,
+)
+
+data class SkillCatalogRecord(
+    val revision: Long,
+    val generatedAt: Instant?,
+    val skills: List<OfficialSkillRecord>,
+)
+
+@Serializable
+data class AIHintCardDto(
+    val id: String,
+    val displayText: String? = null,
+    val text: String? = null,
+    val prompt: String,
+    val category: String = "general",
+    val priority: Int = 50,
+    val source: String = "remote",
+    val locale: String,
+    val conditions: List<String> = emptyList(),
+    val metadata: JsonObject? = null,
+)
+
+@Serializable
+data class AIHintPackResponse(
+    val locale: String,
+    val generatedAt: String? = null,
+    val expiresAt: String? = null,
+    val version: Int,
+    val cards: List<AIHintCardDto>,
+)
+
+@Serializable
+data class AIHintManifestResponse(
+    val generatedAt: String? = null,
+    val expiresAt: String? = null,
+    val intervalHours: Int? = null,
+    val locales: List<String> = emptyList(),
+    val files: Map<String, String?> = emptyMap(),
+)
+
+@Serializable
+data class AdminHintPackResponse(
+    val locale: String,
+    val generatedAt: String? = null,
+    val expiresAt: String? = null,
+    val intervalHours: Int? = null,
+    val version: Int,
+    val cards: List<AIHintCardDto>,
+)
+
+@Serializable
+data class UpdateHintPackRequest(
+    val generatedAt: String? = null,
+    val expiresAt: String? = null,
+    val intervalHours: Int? = null,
+    val cards: List<AIHintCardDto>,
+)
+
+data class HintPackRecord(
+    val locale: String,
+    val generatedAt: Instant?,
+    val expiresAt: Instant?,
+    val intervalHours: Int?,
+    val version: Int,
+    val cardsJson: String,
+)
+
+enum class ContentMutationResult {
+    SUCCESS,
+    NOT_FOUND,
+    CONFLICT,
+    LIMIT_EXCEEDED,
+}
diff --git a/src/main/kotlin/com/osglab/account/features/content/repositories/ContentRepository.kt b/src/main/kotlin/com/osglab/account/features/content/repositories/ContentRepository.kt
new file mode 100644
index 0000000..5a98ad4
--- /dev/null
+++ b/src/main/kotlin/com/osglab/account/features/content/repositories/ContentRepository.kt
@@ -0,0 +1,369 @@
+package com.osglab.account.features.content.repositories
+
+import com.osglab.account.config.DatabaseFactory
+import com.osglab.account.features.admin.models.AdminAuditOutcome
+import com.osglab.account.features.admin.models.NewAdminAuditEvent
+import com.osglab.account.features.admin.repositories.AdminAuditLogTable
+import com.osglab.account.features.content.models.ContentMutationResult
+import com.osglab.account.features.content.models.HintPackRecord
+import com.osglab.account.features.content.models.OfficialSkillRecord
+import com.osglab.account.features.content.models.SkillCatalogRecord
+import com.osglab.account.features.content.models.SkillLocalizationDto
+import com.osglab.account.features.content.models.SkillLocalizationsDto
+import org.jetbrains.exposed.v1.core.ResultRow
+import org.jetbrains.exposed.v1.core.SortOrder
+import org.jetbrains.exposed.v1.core.Table
+import org.jetbrains.exposed.v1.core.and
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.javatime.timestamp
+import org.jetbrains.exposed.v1.jdbc.insert
+import org.jetbrains.exposed.v1.jdbc.selectAll
+import org.jetbrains.exposed.v1.jdbc.update
+import java.time.Instant
+
+internal object OfficialContentCatalogTable : Table("official_content_catalog") {
+    val id = integer("id")
+    val revision = long("revision")
+    val generatedAt = timestamp("generated_at").nullable()
+    override val primaryKey = PrimaryKey(id)
+}
+
+internal object OfficialSkillsTable : Table("official_skills") {
+    val id = varchar("id", 128)
+    val systemImage = varchar("system_image", 128)
+    val sortOrder = integer("sort_order")
+    val thinkingEnabled = bool("thinking_enabled")
+    val enabled = bool("enabled")
+    val createdAt = timestamp("created_at")
+    val updatedAt = timestamp("updated_at")
+    override val primaryKey = PrimaryKey(id)
+}
+
+internal object OfficialSkillLocalizationsTable : Table("official_skill_localizations") {
+    val skillId = varchar("skill_id", 128)
+    val locale = varchar("locale", 16)
+    val name = varchar("name", 120)
+    val summary = varchar("summary", 500)
+    val prompt = text("prompt")
+    override val primaryKey = PrimaryKey(skillId, locale)
+}
+
+internal object OfficialHintPacksTable : Table("official_hint_packs") {
+    val locale = varchar("locale", 8)
+    val generatedAt = timestamp("generated_at").nullable()
+    val expiresAt = timestamp("expires_at").nullable()
+    val intervalHours = integer("interval_hours").nullable()
+    val version = integer("version")
+    val cardsJson = text("cards_json")
+    val updatedAt = timestamp("updated_at")
+    override val primaryKey = PrimaryKey(locale)
+}
+
+interface ContentRepository {
+    suspend fun getSkillCatalog(enabledOnly: Boolean): SkillCatalogRecord
+
+    suspend fun createSkill(
+        skill: OfficialSkillRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult
+
+    suspend fun updateSkill(
+        skill: OfficialSkillRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult
+
+    suspend fun setSkillEnabled(
+        id: String,
+        enabled: Boolean,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult
+
+    suspend fun listHintPacks(): List<HintPackRecord>
+    suspend fun getHintPack(locale: String): HintPackRecord?
+
+    suspend fun putHintPack(
+        pack: HintPackRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): HintPackRecord
+}
+
+class ExposedContentRepository(
+    private val databaseFactory: DatabaseFactory,
+) : ContentRepository {
+    override suspend fun getSkillCatalog(enabledOnly: Boolean): SkillCatalogRecord =
+        databaseFactory.query {
+            val catalog = catalogRow()
+            val statement = OfficialSkillsTable.selectAll()
+            if (enabledOnly) {
+                statement.where { OfficialSkillsTable.enabled eq true }
+            }
+            val skills = statement
+                .orderBy(
+                    OfficialSkillsTable.sortOrder to SortOrder.ASC,
+                    OfficialSkillsTable.id to SortOrder.ASC,
+                )
+                .map { row -> row.toSkillRecord(localizations(row[OfficialSkillsTable.id])) }
+            SkillCatalogRecord(
+                revision = catalog[OfficialContentCatalogTable.revision],
+                generatedAt = catalog[OfficialContentCatalogTable.generatedAt],
+                skills = skills,
+            )
+        }
+
+    override suspend fun createSkill(
+        skill: OfficialSkillRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult = databaseFactory.query {
+        lockCatalog()
+        val exists = OfficialSkillsTable.selectAll()
+            .where { OfficialSkillsTable.id eq skill.id }
+            .limit(1)
+            .any()
+        val result = if (exists) {
+            ContentMutationResult.CONFLICT
+        } else {
+            OfficialSkillsTable.insert {
+                it[id] = skill.id
+                it[systemImage] = skill.systemImage
+                it[sortOrder] = skill.sortOrder
+                it[thinkingEnabled] = skill.thinkingEnabled
+                it[enabled] = skill.enabled
+                it[createdAt] = now
+                it[updatedAt] = now
+            }
+            insertLocalizations(skill)
+            incrementRevision(now)
+            ContentMutationResult.SUCCESS
+        }
+        insertAudit(audit.withOutcome(result))
+        result
+    }
+
+    override suspend fun updateSkill(
+        skill: OfficialSkillRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult = databaseFactory.query {
+        lockCatalog()
+        val exists = OfficialSkillsTable.selectAll()
+            .where { OfficialSkillsTable.id eq skill.id }
+            .forUpdate()
+            .singleOrNull() != null
+        val result = if (!exists) {
+            ContentMutationResult.NOT_FOUND
+        } else {
+            OfficialSkillsTable.update({ OfficialSkillsTable.id eq skill.id }) {
+                it[systemImage] = skill.systemImage
+                it[sortOrder] = skill.sortOrder
+                it[thinkingEnabled] = skill.thinkingEnabled
+                it[updatedAt] = now
+            }
+            updateLocalization(skill.id, ZH_HANS, skill.localizations.zhHans)
+            updateLocalization(skill.id, EN, skill.localizations.en)
+            incrementRevision(now)
+            ContentMutationResult.SUCCESS
+        }
+        insertAudit(audit.withOutcome(result))
+        result
+    }
+
+    override suspend fun setSkillEnabled(
+        id: String,
+        enabled: Boolean,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult = databaseFactory.query {
+        lockCatalog()
+        val row = OfficialSkillsTable.selectAll()
+            .where { OfficialSkillsTable.id eq id }
+            .forUpdate()
+            .singleOrNull()
+        val result = when {
+            row == null -> ContentMutationResult.NOT_FOUND
+            enabled &&
+                !row[OfficialSkillsTable.enabled] &&
+                enabledSkillCount() >= MAXIMUM_ENABLED_SKILLS -> ContentMutationResult.LIMIT_EXCEEDED
+            else -> {
+                OfficialSkillsTable.update({ OfficialSkillsTable.id eq id }) {
+                    it[OfficialSkillsTable.enabled] = enabled
+                    it[updatedAt] = now
+                }
+                incrementRevision(now)
+                ContentMutationResult.SUCCESS
+            }
+        }
+        insertAudit(audit.withOutcome(result))
+        result
+    }
+
+    override suspend fun listHintPacks(): List<HintPackRecord> =
+        databaseFactory.query {
+            OfficialHintPacksTable.selectAll()
+                .orderBy(OfficialHintPacksTable.locale to SortOrder.ASC)
+                .map(ResultRow::toHintPackRecord)
+        }
+
+    override suspend fun getHintPack(locale: String): HintPackRecord? =
+        databaseFactory.query {
+            OfficialHintPacksTable.selectAll()
+                .where { OfficialHintPacksTable.locale eq locale }
+                .limit(1)
+                .singleOrNull()
+                ?.toHintPackRecord()
+        }
+
+    override suspend fun putHintPack(
+        pack: HintPackRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): HintPackRecord = databaseFactory.query {
+        // The singleton lock makes the initial version=1 insert race-free.
+        lockCatalog()
+        val current = OfficialHintPacksTable.selectAll()
+            .where { OfficialHintPacksTable.locale eq pack.locale }
+            .forUpdate()
+            .singleOrNull()
+        val next = pack.copy(version = (current?.get(OfficialHintPacksTable.version) ?: 0) + 1)
+        if (current == null) {
+            OfficialHintPacksTable.insert {
+                it[locale] = next.locale
+                it[generatedAt] = next.generatedAt
+                it[expiresAt] = next.expiresAt
+                it[intervalHours] = next.intervalHours
+                it[version] = next.version
+                it[cardsJson] = next.cardsJson
+                it[updatedAt] = now
+            }
+        } else {
+            OfficialHintPacksTable.update({ OfficialHintPacksTable.locale eq next.locale }) {
+                it[generatedAt] = next.generatedAt
+                it[expiresAt] = next.expiresAt
+                it[intervalHours] = next.intervalHours
+                it[version] = next.version
+                it[cardsJson] = next.cardsJson
+                it[updatedAt] = now
+            }
+        }
+        insertAudit(audit.copy(outcome = AdminAuditOutcome.SUCCESS))
+        next
+    }
+
+    private fun catalogRow(): ResultRow =
+        OfficialContentCatalogTable.selectAll()
+            .where { OfficialContentCatalogTable.id eq CATALOG_ID }
+            .single()
+
+    private fun lockCatalog(): ResultRow =
+        OfficialContentCatalogTable.selectAll()
+            .where { OfficialContentCatalogTable.id eq CATALOG_ID }
+            .forUpdate()
+            .single()
+
+    private fun incrementRevision(now: Instant) {
+        val current = catalogRow()[OfficialContentCatalogTable.revision]
+        OfficialContentCatalogTable.update({ OfficialContentCatalogTable.id eq CATALOG_ID }) {
+            it[revision] = current + 1
+            it[generatedAt] = now
+        }
+    }
+
+    private fun enabledSkillCount(): Long =
+        OfficialSkillsTable.selectAll()
+            .where { OfficialSkillsTable.enabled eq true }
+            .count()
+
+    private fun localizations(skillId: String): SkillLocalizationsDto {
+        val rows = OfficialSkillLocalizationsTable.selectAll()
+            .where { OfficialSkillLocalizationsTable.skillId eq skillId }
+            .associateBy { it[OfficialSkillLocalizationsTable.locale] }
+        return SkillLocalizationsDto(
+            zhHans = requireNotNull(rows[ZH_HANS]).toLocalization(),
+            en = requireNotNull(rows[EN]).toLocalization(),
+        )
+    }
+
+    private fun insertLocalizations(skill: OfficialSkillRecord) {
+        insertLocalization(skill.id, ZH_HANS, skill.localizations.zhHans)
+        insertLocalization(skill.id, EN, skill.localizations.en)
+    }
+
+    private fun insertLocalization(skillId: String, locale: String, value: SkillLocalizationDto) {
+        OfficialSkillLocalizationsTable.insert {
+            it[OfficialSkillLocalizationsTable.skillId] = skillId
+            it[OfficialSkillLocalizationsTable.locale] = locale
+            it[name] = value.name
+            it[summary] = value.summary
+            it[prompt] = value.prompt
+        }
+    }
+
+    private fun updateLocalization(skillId: String, locale: String, value: SkillLocalizationDto) {
+        OfficialSkillLocalizationsTable.update({
+            (OfficialSkillLocalizationsTable.skillId eq skillId) and
+                (OfficialSkillLocalizationsTable.locale eq locale)
+        }) {
+            it[name] = value.name
+            it[summary] = value.summary
+            it[prompt] = value.prompt
+        }
+    }
+
+    private fun insertAudit(event: NewAdminAuditEvent) {
+        AdminAuditLogTable.insert {
+            it[id] = event.id.toString()
+            it[actorOperatorId] = event.actorOperatorId?.toString()
+            it[action] = event.action.name
+            it[outcome] = event.outcome.name
+            it[targetType] = event.targetType
+            it[targetId] = event.targetId
+            it[requestId] = event.requestId
+            it[occurredAt] = event.occurredAt
+        }
+    }
+}
+
+private fun ResultRow.toSkillRecord(localizations: SkillLocalizationsDto): OfficialSkillRecord =
+    OfficialSkillRecord(
+        id = this[OfficialSkillsTable.id],
+        systemImage = this[OfficialSkillsTable.systemImage],
+        sortOrder = this[OfficialSkillsTable.sortOrder],
+        thinkingEnabled = this[OfficialSkillsTable.thinkingEnabled],
+        enabled = this[OfficialSkillsTable.enabled],
+        localizations = localizations,
+    )
+
+private fun ResultRow.toLocalization(): SkillLocalizationDto =
+    SkillLocalizationDto(
+        name = this[OfficialSkillLocalizationsTable.name],
+        summary = this[OfficialSkillLocalizationsTable.summary],
+        prompt = this[OfficialSkillLocalizationsTable.prompt],
+    )
+
+private fun ResultRow.toHintPackRecord(): HintPackRecord =
+    HintPackRecord(
+        locale = this[OfficialHintPacksTable.locale],
+        generatedAt = this[OfficialHintPacksTable.generatedAt],
+        expiresAt = this[OfficialHintPacksTable.expiresAt],
+        intervalHours = this[OfficialHintPacksTable.intervalHours],
+        version = this[OfficialHintPacksTable.version],
+        cardsJson = this[OfficialHintPacksTable.cardsJson],
+    )
+
+private fun NewAdminAuditEvent.withOutcome(result: ContentMutationResult): NewAdminAuditEvent =
+    copy(
+        outcome = if (result == ContentMutationResult.SUCCESS) {
+            AdminAuditOutcome.SUCCESS
+        } else {
+            AdminAuditOutcome.DENIED
+        },
+    )
+
+private const val CATALOG_ID = 1
+private const val MAXIMUM_ENABLED_SKILLS = 100L
+private const val ZH_HANS = "zh-Hans"
+private const val EN = "en"
diff --git a/src/main/kotlin/com/osglab/account/features/content/routes/ContentRoutes.kt b/src/main/kotlin/com/osglab/account/features/content/routes/ContentRoutes.kt
new file mode 100644
index 0000000..efaacaa
--- /dev/null
+++ b/src/main/kotlin/com/osglab/account/features/content/routes/ContentRoutes.kt
@@ -0,0 +1,111 @@
+package com.osglab.account.features.content.routes
+
+import com.osglab.account.features.content.models.AIHintManifestResponse
+import com.osglab.account.features.content.services.ContentErrorCode
+import com.osglab.account.features.content.services.ContentException
+import com.osglab.account.features.content.services.ContentService
+import io.ktor.http.HttpHeaders
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.application.ApplicationCall
+import io.ktor.server.application.call
+import io.ktor.server.request.header
+import io.ktor.server.response.header
+import io.ktor.server.response.respond
+import io.ktor.server.routing.Route
+import io.ktor.server.routing.get
+import io.ktor.server.routing.route
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import java.security.MessageDigest
+
+fun Route.contentRoutes(service: ContentService) {
+    route("/v1/content") {
+        get("/skills") {
+            val catalog = service.publicSkills()
+            call.respondCacheable(etag = "skills-${catalog.revision}") {
+                call.respond(catalog)
+            }
+        }
+
+        get("/hints/manifest") {
+            call.respondHintManifest(service)
+        }
+
+        get("/hints/{locale}") {
+            val locale = call.parameters["locale"]
+            call.respondHintPack(service, locale)
+        }
+    }
+
+    get("/hints/manifest.json") {
+        call.respondHintManifest(service)
+    }
+
+    get("/hints/{fileName}") {
+        val fileName = call.parameters["fileName"].orEmpty()
+        val locale = LEGACY_HINT_FILE.matchEntire(fileName)?.groupValues?.get(1)
+        call.respondHintPack(service, locale)
+    }
+}
+
+private suspend fun ApplicationCall.respondHintManifest(service: ContentService) {
+    val manifest = service.hintManifest()
+    respondCacheable(etag = manifest.etag()) {
+        respond(manifest)
+    }
+}
+
+private suspend fun ApplicationCall.respondHintPack(
+    service: ContentService,
+    locale: String?,
+) {
+    if (locale !in SUPPORTED_HINT_LOCALES) {
+        respond(HttpStatusCode.NotFound)
+        return
+    }
+    try {
+        val pack = service.publicHintPack(requireNotNull(locale))
+        respondCacheable(etag = "hints-$locale-${pack.version}") {
+            respond(pack)
+        }
+    } catch (exception: ContentException) {
+        if (exception.code == ContentErrorCode.CONTENT_HINT_PACK_NOT_FOUND) {
+            respond(HttpStatusCode.NotFound)
+        } else {
+            throw exception
+        }
+    }
+}
+
+private suspend fun ApplicationCall.respondCacheable(
+    etag: String,
+    body: suspend () -> Unit,
+) {
+    val quotedEtag = """"$etag""""
+    response.header(HttpHeaders.ETag, quotedEtag)
+    response.header(HttpHeaders.CacheControl, "public,max-age=300")
+    if (request.header(HttpHeaders.IfNoneMatch).matchesEtag(quotedEtag)) {
+        respond(HttpStatusCode.NotModified)
+    } else {
+        body()
+    }
+}
+
+private fun String?.matchesEtag(etag: String): Boolean =
+    this?.split(',')?.any { candidate ->
+        val normalized = candidate.trim().removePrefix("W/")
+        normalized == "*" || normalized == etag
+    } == true
+
+private fun AIHintManifestResponse.etag(): String {
+    val bytes = PUBLIC_JSON.encodeToString(this).toByteArray(Charsets.UTF_8)
+    val digest = MessageDigest.getInstance("SHA-256").digest(bytes)
+    return "hints-manifest-${digest.take(12).joinToString("") { "%02x".format(it.toInt() and 0xff) }}"
+}
+
+private val PUBLIC_JSON = Json {
+    explicitNulls = false
+    encodeDefaults = true
+}
+private val SUPPORTED_HINT_LOCALES = setOf("zh", "en")
+private val LEGACY_HINT_FILE = Regex("""hints-(zh|en)\.json""")
diff --git a/src/main/kotlin/com/osglab/account/features/content/services/ContentService.kt b/src/main/kotlin/com/osglab/account/features/content/services/ContentService.kt
new file mode 100644
index 0000000..7df8c40
--- /dev/null
+++ b/src/main/kotlin/com/osglab/account/features/content/services/ContentService.kt
@@ -0,0 +1,348 @@
+package com.osglab.account.features.content.services
+
+import com.osglab.account.features.admin.models.AdminAuditAction
+import com.osglab.account.features.admin.models.AdminAuditOutcome
+import com.osglab.account.features.admin.models.AdminPrincipal
+import com.osglab.account.features.admin.models.NewAdminAuditEvent
+import com.osglab.account.features.content.models.AIHintCardDto
+import com.osglab.account.features.content.models.AIHintManifestResponse
+import com.osglab.account.features.content.models.AIHintPackResponse
+import com.osglab.account.features.content.models.AdminHintPackResponse
+import com.osglab.account.features.content.models.AdminOfficialSkillDto
+import com.osglab.account.features.content.models.AdminSkillCatalogResponse
+import com.osglab.account.features.content.models.ContentMutationResult
+import com.osglab.account.features.content.models.CreateOfficialSkillRequest
+import com.osglab.account.features.content.models.HintPackRecord
+import com.osglab.account.features.content.models.OfficialSkillDto
+import com.osglab.account.features.content.models.OfficialSkillRecord
+import com.osglab.account.features.content.models.SkillCatalogResponse
+import com.osglab.account.features.content.models.SkillLocalizationDto
+import com.osglab.account.features.content.models.SkillLocalizationsDto
+import com.osglab.account.features.content.models.UpdateHintPackRequest
+import com.osglab.account.features.content.models.UpdateOfficialSkillRequest
+import com.osglab.account.features.content.repositories.ContentRepository
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import java.time.Clock
+import java.time.Instant
+
+enum class ContentErrorCode {
+    VALIDATION_ERROR,
+    CONTENT_SKILL_NOT_FOUND,
+    CONTENT_SKILL_CONFLICT,
+    CONTENT_HINT_PACK_NOT_FOUND,
+}
+
+class ContentException(
+    val code: ContentErrorCode,
+) : RuntimeException(code.name)
+
+class ContentService(
+    private val repository: ContentRepository,
+    private val clock: Clock = Clock.systemUTC(),
+) {
+    suspend fun publicSkills(): SkillCatalogResponse {
+        val catalog = repository.getSkillCatalog(enabledOnly = true)
+        check(catalog.skills.size <= MAXIMUM_ENABLED_SKILLS) {
+            "Official Skill catalog exceeds the client maximum"
+        }
+        return SkillCatalogResponse(
+            revision = catalog.revision,
+            generatedAt = catalog.generatedAt?.toString(),
+            skills = catalog.skills.map(OfficialSkillRecord::toPublicDto),
+        )
+    }
+
+    suspend fun adminSkills(): AdminSkillCatalogResponse {
+        val catalog = repository.getSkillCatalog(enabledOnly = false)
+        return AdminSkillCatalogResponse(
+            revision = catalog.revision,
+            generatedAt = catalog.generatedAt?.toString(),
+            skills = catalog.skills.map(OfficialSkillRecord::toAdminDto),
+        )
+    }
+
+    suspend fun createSkill(
+        actor: AdminPrincipal,
+        request: CreateOfficialSkillRequest,
+        requestId: String?,
+    ): AdminOfficialSkillDto {
+        validateSkill(
+            id = request.id,
+            systemImage = request.systemImage,
+            sortOrder = request.sortOrder,
+            localizations = request.localizations,
+        )
+        val now = clock.instant()
+        val skill = OfficialSkillRecord(
+            id = request.id,
+            systemImage = request.systemImage.trim(),
+            sortOrder = request.sortOrder,
+            thinkingEnabled = request.thinkingEnabled,
+            enabled = false,
+            localizations = request.localizations.trimmed(),
+        )
+        repository.createSkill(
+            skill,
+            now,
+            audit(actor, AdminAuditAction.CONTENT_SKILL_CREATED, "OFFICIAL_SKILL", skill.id, requestId, now),
+        ).throwOnFailure()
+        return skill.toAdminDto()
+    }
+
+    suspend fun updateSkill(
+        actor: AdminPrincipal,
+        id: String,
+        request: UpdateOfficialSkillRequest,
+        requestId: String?,
+    ): AdminOfficialSkillDto {
+        validateSkill(id, request.systemImage, request.sortOrder, request.localizations)
+        val now = clock.instant()
+        val skill = OfficialSkillRecord(
+            id = id,
+            systemImage = request.systemImage.trim(),
+            sortOrder = request.sortOrder,
+            thinkingEnabled = request.thinkingEnabled,
+            enabled = false,
+            localizations = request.localizations.trimmed(),
+        )
+        repository.updateSkill(
+            skill,
+            now,
+            audit(actor, AdminAuditAction.CONTENT_SKILL_UPDATED, "OFFICIAL_SKILL", id, requestId, now),
+        ).throwOnFailure()
+        val stored = repository.getSkillCatalog(enabledOnly = false).skills.first { it.id == id }
+        return stored.toAdminDto()
+    }
+
+    suspend fun setSkillEnabled(
+        actor: AdminPrincipal,
+        id: String,
+        enabled: Boolean,
+        requestId: String?,
+    ) {
+        validateSkillId(id)
+        val now = clock.instant()
+        repository.setSkillEnabled(
+            id = id,
+            enabled = enabled,
+            now = now,
+            audit = audit(
+                actor,
+                if (enabled) AdminAuditAction.CONTENT_SKILL_ENABLED else AdminAuditAction.CONTENT_SKILL_DISABLED,
+                "OFFICIAL_SKILL",
+                id,
+                requestId,
+                now,
+            ),
+        ).throwOnFailure()
+    }
+
+    suspend fun hintManifest(): AIHintManifestResponse {
+        val packs = repository.listHintPacks()
+        return AIHintManifestResponse(
+            generatedAt = packs.mapNotNull(HintPackRecord::generatedAt).maxOrNull()?.toString(),
+            expiresAt = packs.mapNotNull(HintPackRecord::expiresAt).minOrNull()?.toString(),
+            intervalHours = packs.mapNotNull(HintPackRecord::intervalHours).minOrNull(),
+            locales = packs.map(HintPackRecord::locale),
+            files = packs.associate { it.locale to "/v1/content/hints/${it.locale}" },
+        )
+    }
+
+    suspend fun publicHintPack(locale: String): AIHintPackResponse {
+        validateHintLocale(locale)
+        return repository.getHintPack(locale)?.toPublicDto()
+            ?: throw ContentException(ContentErrorCode.CONTENT_HINT_PACK_NOT_FOUND)
+    }
+
+    suspend fun adminHintPack(locale: String): AdminHintPackResponse {
+        validateHintLocale(locale)
+        return repository.getHintPack(locale)?.toAdminDto()
+            ?: AdminHintPackResponse(locale = locale, version = 0, cards = emptyList())
+    }
+
+    suspend fun putHintPack(
+        actor: AdminPrincipal,
+        locale: String,
+        request: UpdateHintPackRequest,
+        requestId: String?,
+    ): AdminHintPackResponse {
+        validateHintLocale(locale)
+        val generatedAt = parseInstant(request.generatedAt)
+        val expiresAt = parseInstant(request.expiresAt)
+        if (generatedAt != null && expiresAt != null && !expiresAt.isAfter(generatedAt)) {
+            invalid()
+        }
+        if (request.intervalHours != null && request.intervalHours !in 1..168) invalid()
+        validateCards(locale, request.cards)
+        val cardsJson = CONTENT_JSON.encodeToString(
+            ListSerializer(AIHintCardDto.serializer()),
+            request.cards,
+        )
+        if (cardsJson.length > MAX_HINT_PACK_CHARACTERS) invalid()
+        val now = clock.instant()
+        val stored = repository.putHintPack(
+            HintPackRecord(
+                locale = locale,
+                generatedAt = generatedAt,
+                expiresAt = expiresAt,
+                intervalHours = request.intervalHours,
+                version = 0,
+                cardsJson = cardsJson,
+            ),
+            now,
+            audit(
+                actor,
+                AdminAuditAction.CONTENT_HINT_PACK_PUBLISHED,
+                "OFFICIAL_HINT_PACK",
+                locale,
+                requestId,
+                now,
+            ),
+        )
+        return stored.toAdminDto()
+    }
+
+    private fun validateSkill(
+        id: String,
+        systemImage: String,
+        sortOrder: Int,
+        localizations: SkillLocalizationsDto,
+    ) {
+        validateSkillId(id)
+        if (systemImage.trim().length !in 1..MAX_SYSTEM_IMAGE_CHARACTERS) invalid()
+        if (sortOrder !in 0..100_000) invalid()
+        validateLocalization(localizations.zhHans)
+        validateLocalization(localizations.en)
+    }
+
+    private fun validateSkillId(id: String) {
+        if (!SKILL_ID.matches(id)) invalid()
+    }
+
+    private fun validateHintLocale(locale: String) {
+        if (locale !in SUPPORTED_HINT_LOCALES) invalid()
+    }
+
+    private fun validateLocalization(value: SkillLocalizationDto) {
+        if (value.name.trim().length !in 1..MAX_SKILL_NAME_CHARACTERS) invalid()
+        if (value.summary.trim().length !in 1..MAX_SKILL_SUMMARY_CHARACTERS) invalid()
+        if (value.prompt.trim().length !in 1..MAX_SKILL_PROMPT_CHARACTERS) invalid()
+    }
+
+    private fun validateCards(locale: String, cards: List<AIHintCardDto>) {
+        if (cards.size > MAX_HINT_CARDS || cards.map { it.id }.toSet().size != cards.size) invalid()
+        cards.forEach { card ->
+            if (card.id.trim().length !in 1..128) invalid()
+            if (card.locale != locale) invalid()
+            if (card.displayText.isNullOrBlank() && card.text.isNullOrBlank()) invalid()
+            if ((card.displayText?.length ?: 0) > 500 || (card.text?.length ?: 0) > 500) invalid()
+            if (card.prompt.trim().length !in 1..MAX_HINT_PROMPT_CHARACTERS) invalid()
+            if (card.category.trim().length !in 1..64 || card.source.trim().length !in 1..64) invalid()
+            if (card.priority !in -10_000..10_000) invalid()
+            if (card.conditions.size > 20 || card.conditions.any { it.length !in 1..64 }) invalid()
+            if ((card.metadata?.toString()?.length ?: 0) > MAX_METADATA_CHARACTERS) invalid()
+        }
+    }
+
+    private fun parseInstant(value: String?): Instant? =
+        value?.let {
+            runCatching { Instant.parse(it) }.getOrElse { invalid() }
+        }
+
+    private fun ContentMutationResult.throwOnFailure() {
+        when (this) {
+            ContentMutationResult.SUCCESS -> Unit
+            ContentMutationResult.NOT_FOUND ->
+                throw ContentException(ContentErrorCode.CONTENT_SKILL_NOT_FOUND)
+            ContentMutationResult.CONFLICT ->
+                throw ContentException(ContentErrorCode.CONTENT_SKILL_CONFLICT)
+            ContentMutationResult.LIMIT_EXCEEDED ->
+                throw ContentException(ContentErrorCode.VALIDATION_ERROR)
+        }
+    }
+}
+
+private fun OfficialSkillRecord.toPublicDto(): OfficialSkillDto =
+    OfficialSkillDto(
+        id = id,
+        systemImage = systemImage,
+        sortOrder = sortOrder,
+        thinkingEnabled = thinkingEnabled,
+        localizations = localizations,
+    )
+
+private fun OfficialSkillRecord.toAdminDto(): AdminOfficialSkillDto =
+    AdminOfficialSkillDto(
+        id = id,
+        systemImage = systemImage,
+        sortOrder = sortOrder,
+        thinkingEnabled = thinkingEnabled,
+        enabled = enabled,
+        localizations = localizations,
+    )
+
+private fun HintPackRecord.toPublicDto(): AIHintPackResponse =
+    AIHintPackResponse(
+        locale = locale,
+        generatedAt = generatedAt?.toString(),
+        expiresAt = expiresAt?.toString(),
+        version = version,
+        cards = decodeCards(),
+    )
+
+private fun HintPackRecord.toAdminDto(): AdminHintPackResponse =
+    AdminHintPackResponse(
+        locale = locale,
+        generatedAt = generatedAt?.toString(),
+        expiresAt = expiresAt?.toString(),
+        intervalHours = intervalHours,
+        version = version,
+        cards = decodeCards(),
+    )
+
+private fun HintPackRecord.decodeCards(): List<AIHintCardDto> =
+    CONTENT_JSON.decodeFromString(ListSerializer(AIHintCardDto.serializer()), cardsJson)
+
+private fun SkillLocalizationsDto.trimmed(): SkillLocalizationsDto =
+    SkillLocalizationsDto(zhHans.trimmed(), en.trimmed())
+
+private fun SkillLocalizationDto.trimmed(): SkillLocalizationDto =
+    SkillLocalizationDto(name.trim(), summary.trim(), prompt.trim())
+
+private fun audit(
+    actor: AdminPrincipal,
+    action: AdminAuditAction,
+    targetType: String,
+    targetId: String,
+    requestId: String?,
+    now: Instant,
+): NewAdminAuditEvent = NewAdminAuditEvent(
+    actorOperatorId = actor.operatorId,
+    action = action,
+    outcome = AdminAuditOutcome.SUCCESS,
+    targetType = targetType,
+    targetId = targetId,
+    requestId = requestId,
+    occurredAt = now,
+)
+
+private fun invalid(): Nothing = throw ContentException(ContentErrorCode.VALIDATION_ERROR)
+
+private val CONTENT_JSON = Json {
+    ignoreUnknownKeys = false
+    explicitNulls = false
+    encodeDefaults = true
+}
+private val SKILL_ID = Regex("""official\.[a-z0-9._-]{1,91}""")
+private val SUPPORTED_HINT_LOCALES = setOf("zh", "en")
+private const val MAX_SYSTEM_IMAGE_CHARACTERS = 100
+private const val MAXIMUM_ENABLED_SKILLS = 100
+private const val MAX_SKILL_NAME_CHARACTERS = 40
+private const val MAX_SKILL_SUMMARY_CHARACTERS = 200
+private const val MAX_SKILL_PROMPT_CHARACTERS = 6_000
+private const val MAX_HINT_PROMPT_CHARACTERS = 16_000
+private const val MAX_HINT_CARDS = 500
+private const val MAX_METADATA_CHARACTERS = 8_000
+private const val MAX_HINT_PACK_CHARACTERS = 1_000_000
diff --git a/src/main/kotlin/com/osglab/account/features/credits/services/CreditService.kt b/src/main/kotlin/com/osglab/account/features/credits/services/CreditService.kt
index d13c2fb..26175ac 100644
--- a/src/main/kotlin/com/osglab/account/features/credits/services/CreditService.kt
+++ b/src/main/kotlin/com/osglab/account/features/credits/services/CreditService.kt
@@ -127,6 +127,12 @@ class CreditService(
         return transactions.inTransaction { it.credits.listLedgerEntries(userId, limit) }
     }
 
+    suspend fun hasSignupTrial(userId: UUID): Boolean =
+        transactions.inTransaction { unit ->
+            unit.credits.findLedgerEntry(userId, signupTrialIdempotencyKey(userId))
+                ?.type == LedgerEntryType.SIGNUP_TRIAL
+        }
+
     override suspend fun getReservation(
         userId: UUID,
         reservationId: UUID,
@@ -740,3 +746,6 @@ class CreditService(
         val ADMIN_REQUEST_ID = Regex("^[A-Za-z0-9._:-]+$")
     }
 }
+
+internal fun signupTrialIdempotencyKey(userId: UUID): String =
+    "internal:signup-trial:$userId"
diff --git a/src/main/kotlin/com/osglab/account/features/integrity/DeviceCheck.kt b/src/main/kotlin/com/osglab/account/features/integrity/DeviceCheck.kt
index 8c8364f..67cc20d 100644
--- a/src/main/kotlin/com/osglab/account/features/integrity/DeviceCheck.kt
+++ b/src/main/kotlin/com/osglab/account/features/integrity/DeviceCheck.kt
@@ -307,6 +307,12 @@ interface DeviceCheckTrialClaimRepository {
 
 fun interface TrialCreditGranter {
     suspend fun grant(accountId: UUID)
+
+    /**
+     * DeviceCheck tokens are ephemeral and cannot identify a previous claim.
+     * The immutable credit ledger is the authoritative account-level record.
+     */
+    suspend fun wasGranted(accountId: UUID): Boolean = false
 }
 
 interface DeviceCheckTrialMutex {
@@ -341,8 +347,19 @@ private object LocalDeviceCheckTrialMutex : DeviceCheckTrialMutex {
     override suspend fun <T> withLock(block: suspend () -> T): T = block()
 }
 
+enum class SignupTrialClaimResult {
+    GRANTED,
+    ALREADY_GRANTED,
+    INELIGIBLE,
+    SKIPPED,
+    ;
+
+    val shouldRestrictAccount: Boolean
+        get() = this == INELIGIBLE
+}
+
 fun interface SignupTrialClaimService {
-    suspend fun claimAndGrant(accountId: UUID, deviceToken: String?): Boolean
+    suspend fun claimAndGrant(accountId: UUID, deviceToken: String?): SignupTrialClaimResult
 }
 
 class DeviceCheckTrialService(
@@ -353,35 +370,47 @@ class DeviceCheckTrialService(
     private val mutex: DeviceCheckTrialMutex = LocalDeviceCheckTrialMutex,
     private val clock: Clock = Clock.systemUTC(),
 ) : SignupTrialClaimService {
-    override suspend fun claimAndGrant(accountId: UUID, deviceToken: String?): Boolean {
-        if (deviceToken.isNullOrBlank()) return false
+    override suspend fun claimAndGrant(
+        accountId: UUID,
+        deviceToken: String?,
+    ): SignupTrialClaimResult {
+        if (creditGranter.wasGranted(accountId)) {
+            return SignupTrialClaimResult.ALREADY_GRANTED
+        }
+        if (deviceToken.isNullOrBlank()) return SignupTrialClaimResult.SKIPPED
         val tokenHash = sha256Hex(deviceToken)
         val owned = when (val result = repository.begin(tokenHash, accountId, clock.instant())) {
             is BeginTrialClaim.Owned -> result.claim
-            BeginTrialClaim.ClaimedByAnotherAccount -> return false
+            BeginTrialClaim.ClaimedByAnotherAccount -> return SignupTrialClaimResult.INELIGIBLE
         }
         return try {
             mutex.withLock {
+                if (creditGranter.wasGranted(accountId)) {
+                    return@withLock SignupTrialClaimResult.ALREADY_GRANTED
+                }
                 completeOwnedClaim(owned, deviceToken)
             }
         } catch (exception: DeviceCheckRejectedException) {
             repository.transition(tokenHash, TrialClaimStatus.REJECTED, clock.instant())
-            false
+            SignupTrialClaimResult.INELIGIBLE
         } catch (exception: DeviceCheckUnavailableException) {
             if (policy == IntegrityPolicy.ENFORCE) {
                 throw ExternalServiceUnavailableException("DeviceCheck")
             }
-            false
+            SignupTrialClaimResult.SKIPPED
         }
     }
 
-    private suspend fun completeOwnedClaim(claim: TrialClaim, deviceToken: String): Boolean {
+    private suspend fun completeOwnedClaim(
+        claim: TrialClaim,
+        deviceToken: String,
+    ): SignupTrialClaimResult {
         when (claim.status) {
-            TrialClaimStatus.COMPLETED -> return true
-            TrialClaimStatus.REJECTED -> return false
+            TrialClaimStatus.COMPLETED -> return SignupTrialClaimResult.ALREADY_GRANTED
+            TrialClaimStatus.REJECTED -> return SignupTrialClaimResult.INELIGIBLE
             TrialClaimStatus.APPLE_MARKED -> {
                 grantAndComplete(claim)
-                return true
+                return SignupTrialClaimResult.GRANTED
             }
             TrialClaimStatus.RESERVED -> Unit
         }
@@ -392,7 +421,7 @@ class DeviceCheckTrialService(
         }
         if (state.bit0) {
             repository.transition(claim.tokenHash, TrialClaimStatus.REJECTED, clock.instant())
-            return false
+            return SignupTrialClaimResult.INELIGIBLE
         }
 
         // Apple has no compare-and-set API. Marking first is intentionally conservative:
@@ -407,7 +436,7 @@ class DeviceCheckTrialService(
         }
         repository.transition(claim.tokenHash, TrialClaimStatus.APPLE_MARKED, clock.instant())
         grantAndComplete(claim)
-        return true
+        return SignupTrialClaimResult.GRANTED
     }
 
     private suspend fun grantAndComplete(claim: TrialClaim) {
diff --git a/src/main/resources/db/migration/V21__repair_signup_trial_restrictions.sql b/src/main/resources/db/migration/V21__repair_signup_trial_restrictions.sql
new file mode 100644
index 0000000..ef2f093
--- /dev/null
+++ b/src/main/resources/db/migration/V21__repair_signup_trial_restrictions.sql
@@ -0,0 +1,14 @@
+-- Accounts with an immutable signup-trial grant were incorrectly restricted
+-- when a later sign-in supplied a fresh ephemeral DeviceCheck token.
+UPDATE accounts AS account
+SET
+    account.anti_abuse_restricted = FALSE,
+    account.updated_at = CURRENT_TIMESTAMP(6)
+WHERE account.anti_abuse_restricted = TRUE
+  AND EXISTS (
+      SELECT 1
+      FROM credit_ledger AS ledger
+      WHERE ledger.user_id = account.id
+        AND ledger.entry_type = 'SIGNUP_TRIAL'
+        AND ledger.idempotency_key = CONCAT('internal:signup-trial:', account.id)
+  );
diff --git a/src/main/resources/db/migration/V22__official_content_management.sql b/src/main/resources/db/migration/V22__official_content_management.sql
new file mode 100644
index 0000000..1dd8b09
--- /dev/null
+++ b/src/main/resources/db/migration/V22__official_content_management.sql
@@ -0,0 +1,55 @@
+-- Official content is immediately published. The singleton catalog row
+-- serializes revision changes and also protects first-write hint versions.
+CREATE TABLE official_content_catalog (
+    id TINYINT UNSIGNED NOT NULL,
+    revision BIGINT UNSIGNED NOT NULL DEFAULT 0,
+    generated_at DATETIME(6) NULL,
+    PRIMARY KEY (id),
+    CONSTRAINT chk_official_content_catalog_singleton CHECK (id = 1)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+
+INSERT INTO official_content_catalog (id, revision, generated_at)
+VALUES (1, 0, NULL);
+
+CREATE TABLE official_skills (
+    id VARCHAR(128) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    system_image VARCHAR(128) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    sort_order INT NOT NULL,
+    thinking_enabled BOOLEAN NOT NULL,
+    enabled BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at DATETIME(6) NOT NULL,
+    updated_at DATETIME(6) NOT NULL,
+    PRIMARY KEY (id),
+    KEY idx_official_skills_enabled_sort (enabled, sort_order, id),
+    CONSTRAINT chk_official_skills_id CHECK (id LIKE 'official.%')
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+
+CREATE TABLE official_skill_localizations (
+    skill_id VARCHAR(128) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    locale VARCHAR(16) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    name VARCHAR(120) NOT NULL,
+    summary VARCHAR(500) NOT NULL,
+    prompt TEXT NOT NULL,
+    PRIMARY KEY (skill_id, locale),
+    CONSTRAINT fk_official_skill_localizations_skill
+        FOREIGN KEY (skill_id) REFERENCES official_skills (id) ON DELETE CASCADE,
+    CONSTRAINT chk_official_skill_localizations_locale
+        CHECK (locale IN ('zh-Hans', 'en'))
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
+
+CREATE TABLE official_hint_packs (
+    locale VARCHAR(8) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    generated_at DATETIME(6) NULL,
+    expires_at DATETIME(6) NULL,
+    interval_hours INT NULL,
+    version INT UNSIGNED NOT NULL,
+    cards_json MEDIUMTEXT NOT NULL,
+    updated_at DATETIME(6) NOT NULL,
+    PRIMARY KEY (locale),
+    CONSTRAINT chk_official_hint_packs_locale CHECK (locale IN ('zh', 'en')),
+    CONSTRAINT chk_official_hint_packs_interval
+        CHECK (interval_hours IS NULL OR interval_hours BETWEEN 1 AND 168),
+    CONSTRAINT chk_official_hint_packs_version CHECK (version >= 1),
+    CONSTRAINT chk_official_hint_packs_expiry
+        CHECK (expires_at IS NULL OR generated_at IS NULL OR expires_at > generated_at)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
diff --git a/src/main/resources/db/migration/V23__keyboard_usage_daily_summaries.sql b/src/main/resources/db/migration/V23__keyboard_usage_daily_summaries.sql
new file mode 100644
index 0000000..712ead2
--- /dev/null
+++ b/src/main/resources/db/migration/V23__keyboard_usage_daily_summaries.sql
@@ -0,0 +1,51 @@
+-- Privacy-minimized daily counters for text manually committed by OSGKeyboard.
+-- Raw text, key sequences, surrounding context and host application identifiers
+-- are intentionally absent.
+CREATE TABLE keyboard_usage_daily_summaries (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
+    installation_hash CHAR(64) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    client_summary_id CHAR(36) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    summary_date DATE NOT NULL,
+    chinese_character_count BIGINT UNSIGNED NOT NULL,
+    english_character_count BIGINT UNSIGNED NOT NULL,
+    other_character_count BIGINT UNSIGNED NOT NULL,
+    input_session_count BIGINT UNSIGNED NOT NULL,
+    chinese_only_session_count BIGINT UNSIGNED NOT NULL,
+    english_only_session_count BIGINT UNSIGNED NOT NULL,
+    mixed_language_session_count BIGINT UNSIGNED NOT NULL,
+    other_only_session_count BIGINT UNSIGNED NOT NULL,
+    app_version VARCHAR(32) CHARACTER SET ascii COLLATE ascii_bin NULL,
+    os_version VARCHAR(32) CHARACTER SET ascii COLLATE ascii_bin NULL,
+    payload_hash CHAR(64) CHARACTER SET ascii COLLATE ascii_bin NOT NULL,
+    received_at DATETIME(6) NOT NULL,
+    PRIMARY KEY (id),
+    UNIQUE KEY uq_keyboard_usage_installation_id (installation_hash, client_summary_id),
+    UNIQUE KEY uq_keyboard_usage_installation_date (installation_hash, summary_date),
+    INDEX ix_keyboard_usage_summary_date (summary_date),
+    CONSTRAINT fk_keyboard_usage_installation
+        FOREIGN KEY (installation_hash)
+        REFERENCES product_analytics_installations (installation_hash)
+        ON DELETE CASCADE,
+    CONSTRAINT chk_keyboard_usage_chinese_count
+        CHECK (chinese_character_count <= 1000000),
+    CONSTRAINT chk_keyboard_usage_english_count
+        CHECK (english_character_count <= 1000000),
+    CONSTRAINT chk_keyboard_usage_other_count
+        CHECK (other_character_count <= 1000000),
+    CONSTRAINT chk_keyboard_usage_session_count
+        CHECK (input_session_count BETWEEN 1 AND 100000),
+    CONSTRAINT chk_keyboard_usage_session_partitions CHECK (
+        chinese_only_session_count <= 100000
+        AND english_only_session_count <= 100000
+        AND mixed_language_session_count <= 100000
+        AND other_only_session_count <= 100000
+        AND chinese_only_session_count
+            + english_only_session_count
+            + mixed_language_session_count
+            + other_only_session_count = input_session_count
+    ),
+    CONSTRAINT chk_keyboard_usage_characters CHECK (
+        chinese_character_count + english_character_count + other_character_count
+            >= input_session_count
+    )
+) ENGINE = InnoDB;
diff --git a/src/test/kotlin/com/osglab/account/config/DeploymentConsistencyTest.kt b/src/test/kotlin/com/osglab/account/config/DeploymentConsistencyTest.kt
index fa8e5de..4e80b30 100644
--- a/src/test/kotlin/com/osglab/account/config/DeploymentConsistencyTest.kt
+++ b/src/test/kotlin/com/osglab/account/config/DeploymentConsistencyTest.kt
@@ -39,6 +39,40 @@ class DeploymentConsistencyTest : FunSpec({
         openApi shouldContain "referralCode"
     }
 
+    test("official content contract migration and runtime grants stay aligned") {
+        val openApi = root.read("docs/openapi.yaml")
+        val migration = root.read(
+            "src/main/resources/db/migration/V22__official_content_management.sql",
+        )
+        val privileges = root.read("docs/mysql-minimum-privileges.sql")
+        val smokePrivileges = root.read("deploy/smoke/runtime-grants.sql")
+
+        migration shouldContain "CREATE TABLE official_content_catalog"
+        migration shouldContain "CREATE TABLE official_skills"
+        migration shouldContain "CREATE TABLE official_skill_localizations"
+        migration shouldContain "CREATE TABLE official_hint_packs"
+        migration shouldContain "locale IN ('zh', 'en')"
+        openApi shouldContain "schemaVersion: { type: integer, const: 1 }"
+        openApi shouldContain "pattern: \"^official\\\\."
+        openApi shouldContain "Cache-Control: { schema: { type: string, const: \"public,max-age=300\" } }"
+        val skillSchemas = openApi
+            .substringAfter("    SkillLocalization:")
+            .substringBefore("    AIHintCard:")
+        skillSchemas shouldContain "name: { type: string, minLength: 1, maxLength: 40 }"
+        skillSchemas shouldContain "summary: { type: string, minLength: 1, maxLength: 200 }"
+        skillSchemas shouldContain "prompt: { type: string, minLength: 1, maxLength: 6000 }"
+        skillSchemas shouldContain "systemImage: { type: string, minLength: 1, maxLength: 100 }"
+        skillSchemas shouldContain "sortOrder: { type: integer, minimum: 0, maximum: 100000 }"
+        skillSchemas shouldContain "maxItems: 100"
+        listOf(privileges, smokePrivileges).forEach { grants ->
+            grants shouldContain "SELECT ON osg_account"
+            grants shouldContain "official_content_catalog"
+            grants shouldContain "official_skills"
+            grants shouldContain "official_skill_localizations"
+            grants shouldContain "official_hint_packs"
+        }
+    }
+
     test("admin ledger operations stay indexed exact and privacy minimized") {
         val migration = root.read(
             "src/main/resources/db/migration/V19__admin_ledger_operations.sql",
@@ -165,7 +199,7 @@ class DeploymentConsistencyTest : FunSpec({
         val openApi = root.read("docs/openapi.yaml")
         val eventSchema = openApi
             .substringAfter("    ProductAnalyticsEvent:")
-            .substringBefore("    AdminSessionState:")
+            .substringBefore("    SkillLocalization:")
         eventSchema shouldContain "additionalProperties: false"
         eventSchema shouldContain "AI_FEATURE_SUCCEEDED"
         eventSchema shouldContain "INSUFFICIENT_CREDITS"
@@ -174,6 +208,26 @@ class DeploymentConsistencyTest : FunSpec({
         eventSchema shouldNotContain "audio"
         eventSchema shouldNotContain "modelOutput"
         openApi shouldContain "schema: { \$ref: \"#/components/schemas/AdminProductAnalytics\" }"
+
+        val keyboardMigration = root.read(
+            "src/main/resources/db/migration/V23__keyboard_usage_daily_summaries.sql",
+        )
+        keyboardMigration shouldContain "keyboard_usage_daily_summaries"
+        keyboardMigration shouldContain
+            "UNIQUE KEY uq_keyboard_usage_installation_date (installation_hash, summary_date)"
+        keyboardMigration shouldContain "ON DELETE CASCADE"
+        keyboardMigration shouldNotContain "input_text"
+        keyboardMigration shouldNotContain "host_application"
+
+        val keyboardSchema = openApi
+            .substringAfter("    KeyboardUsageSummary:")
+            .substringBefore("    ProductAnalyticsBatchResponse:")
+        keyboardSchema shouldContain "additionalProperties: false"
+        keyboardSchema shouldContain "chineseCharacterCount"
+        keyboardSchema shouldContain "mixedLanguageSessionCount"
+        keyboardSchema shouldNotContain "userText"
+        keyboardSchema shouldNotContain "keystrokes"
+        keyboardSchema shouldNotContain "hostApplication"
     }
 
     test("production Compose reuses private MySQL and hardens the application container") {
@@ -301,6 +355,7 @@ private val EXPECTED_PUBLIC_PATHS = setOf(
     "/v1/account",
     "/v1/apple/events",
     "/v1/analytics/events",
+    "/v1/analytics/keyboard-usage",
     "/v1/credits/balance",
     "/v1/credits/ledger",
     "/v1/credits/rates",
@@ -323,6 +378,16 @@ private val EXPECTED_PUBLIC_PATHS = setOf(
     "/v1/gateway/asr",
     "/v1/gateway/asr/sessions",
     "/v1/gateway/asr/sessions/{sessionId}/stream",
+    "/v1/content/skills",
+    "/v1/content/hints/manifest",
+    "/v1/content/hints/{locale}",
+    "/hints/manifest.json",
+    "/hints/hints-{locale}.json",
+    "/v1/admin/content/skills",
+    "/v1/admin/content/skills/{id}",
+    "/v1/admin/content/skills/{id}/enable",
+    "/v1/admin/content/skills/{id}/disable",
+    "/v1/admin/content/hints/{locale}",
     "/v1/admin/auth/session",
     "/v1/admin/auth/login",
     "/v1/admin/auth/logout",
diff --git a/src/test/kotlin/com/osglab/account/config/SmokeDeploymentTest.kt b/src/test/kotlin/com/osglab/account/config/SmokeDeploymentTest.kt
index 27b5bc7..60147ff 100644
--- a/src/test/kotlin/com/osglab/account/config/SmokeDeploymentTest.kt
+++ b/src/test/kotlin/com/osglab/account/config/SmokeDeploymentTest.kt
@@ -51,17 +51,16 @@ class SmokeDeploymentTest : FunSpec({
 
     test("runtime grants cover every migrated table without mutable history privileges") {
         val grants = root.read("deploy/smoke/runtime-grants.sql")
-        val migrationTables = (1..17)
-            .flatMap { version ->
-                val migration = Files.list(root.resolve("src/main/resources/db/migration")).use { paths ->
-                    paths.filter { it.fileName.toString().startsWith("V${version}__") }
-                        .findFirst()
-                        .orElseThrow()
+        val migrationTables = Files.list(root.resolve("src/main/resources/db/migration")).use { paths ->
+            paths.filter { MIGRATION_FILE.matches(it.fileName.toString()) }
+                .flatMap { migration ->
+                    CREATE_TABLE.findAll(Files.readString(migration))
+                        .map { it.groupValues[1] }
+                        .toList()
+                        .stream()
                 }
-                CREATE_TABLE.findAll(Files.readString(migration))
-                    .map { it.groupValues[1] }
-                    .toList()
-            }
+                .toList()
+        }
             .toSet()
         val grantedTables = GRANTED_TABLE.findAll(grants)
             .map { it.groupValues[1] }
@@ -93,3 +92,4 @@ private fun Path.read(relativePath: String): String =
 
 private val CREATE_TABLE = Regex("""CREATE TABLE\s+([a-z0-9_]+)""", RegexOption.IGNORE_CASE)
 private val GRANTED_TABLE = Regex("""ON osg_account_smoke\.([a-z0-9_]+)""")
+private val MIGRATION_FILE = Regex("""V\d+__.+\.sql""")
diff --git a/src/test/kotlin/com/osglab/account/features/admin/stats/AdminProductAnalyticsServiceTest.kt b/src/test/kotlin/com/osglab/account/features/admin/stats/AdminProductAnalyticsServiceTest.kt
index 6a05083..4c82af5 100644
--- a/src/test/kotlin/com/osglab/account/features/admin/stats/AdminProductAnalyticsServiceTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/admin/stats/AdminProductAnalyticsServiceTest.kt
@@ -7,6 +7,7 @@ import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsCountR
 import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsFeatureRow
 import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsGrowthFunnelRow
 import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsGuardrailRow
+import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsKeyboardUsageRow
 import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsMonetizationRow
 import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsReferralRow
 import com.osglab.account.features.admin.stats.repositories.AdminAnalyticsWindow
@@ -42,6 +43,10 @@ class AdminProductAnalyticsServiceTest : FunSpec({
         result.activity.stickinessPercent shouldBe 20.0
         result.activity.successfulRequestsPerActiveUser shouldBe 5.0
         result.consumption.averageCreditsPerManagedRequest shouldBe 2.5
+        result.keyboardUsage.activationToInput.percent shouldBe 80.0
+        result.keyboardUsage.chineseSharePercent shouldBe 60.0
+        result.keyboardUsage.englishSharePercent shouldBe 40.0
+        result.keyboardUsage.averageCharactersPerInputSession shouldBe 12.0
         result.retention.first().d1?.percent shouldBe 50.0
         result.retention.first().d7?.percent shouldBe 30.0
         result.retention.first().d30 shouldBe null
@@ -63,6 +68,22 @@ class AdminProductAnalyticsServiceTest : FunSpec({
             periodActiveUsers = 0,
             activation24h = AdminAnalyticsCountRow(0, 0),
             consumption = AdminAnalyticsConsumptionRow(0, 0, null, null),
+            keyboardUsage = AdminAnalyticsKeyboardUsageRow(
+                activeUsers = 0,
+                keyboardUsers = 0,
+                chineseActiveUsers = 0,
+                englishActiveUsers = 0,
+                bilingualActiveUsers = 0,
+                totalCharacters = 0,
+                chineseCharacters = 0,
+                englishCharacters = 0,
+                otherCharacters = 0,
+                inputSessions = 0,
+                chineseOnlySessions = 0,
+                englishOnlySessions = 0,
+                mixedLanguageSessions = 0,
+                otherOnlySessions = 0,
+            ),
         )
         val service = AdminProductAnalyticsService(
             object : AdminProductAnalyticsRepository {
@@ -84,6 +105,9 @@ class AdminProductAnalyticsServiceTest : FunSpec({
         result.activity.stickinessPercent shouldBe null
         result.activity.successfulRequestsPerActiveUser shouldBe null
         result.consumption.averageCreditsPerManagedRequest shouldBe null
+        result.keyboardUsage.activationToInput.percent shouldBe null
+        result.keyboardUsage.chineseSharePercent shouldBe null
+        result.keyboardUsage.averageCharactersPerInputSession shouldBe null
     }
 })
 
@@ -130,6 +154,22 @@ private fun snapshot(): AdminProductAnalyticsSnapshot =
         features = listOf(
             AdminAnalyticsFeatureRow("POLISH", "MANAGED", 30, 100),
         ),
+        keyboardUsage = AdminAnalyticsKeyboardUsageRow(
+            activeUsers = 40,
+            keyboardUsers = 50,
+            chineseActiveUsers = 30,
+            englishActiveUsers = 20,
+            bilingualActiveUsers = 10,
+            totalCharacters = 1_200,
+            chineseCharacters = 600,
+            englishCharacters = 400,
+            otherCharacters = 200,
+            inputSessions = 100,
+            chineseOnlySessions = 50,
+            englishOnlySessions = 30,
+            mixedLanguageSessions = 15,
+            otherOnlySessions = 5,
+        ),
         referrals = AdminAnalyticsReferralRow(20, 15, 10, 8, 5),
         guardrails = AdminAnalyticsGuardrailRow(
             clientSuccess = AdminAnalyticsCountRow(90, 100),
diff --git a/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryIntegrationTest.kt b/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryIntegrationTest.kt
index 2dd8019..e2c3f62 100644
--- a/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryIntegrationTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryIntegrationTest.kt
@@ -81,6 +81,19 @@ class AdminStatsRepositoryIntegrationTest : FunSpec({
                 analytics.retention.shouldBeEmpty()
                 analytics.features.shouldBeEmpty()
                 analytics.consumption.totalCredits shouldBeExactly 0
+                analytics.keyboardUsage.activeUsers shouldBeExactly 0
+                analytics.keyboardUsage.totalCharacters shouldBeExactly 0
+
+                factory.query { seedAdminCreditStats() }
+                val populatedStats = ExposedAdminStatsRepository(factory).load(
+                    AdminStatsRange(
+                        from = Instant.parse("2026-08-10T12:00:00Z"),
+                        until = Instant.parse("2026-08-17T12:00:00Z"),
+                    ),
+                )
+
+                populatedStats.overview.grantedCredits shouldBeExactly 100
+                populatedStats.grantedCreditsByDate.values.single() shouldBeExactly 100
 
                 factory.query { seedProductAnalytics() }
                 val populated = ExposedAdminProductAnalyticsRepository(factory).load(
@@ -106,6 +119,11 @@ class AdminStatsRepositoryIntegrationTest : FunSpec({
                 populated.successfulAiRequests shouldBeExactly 2
                 populated.features.single().successes shouldBeExactly 2
                 populated.retention.single().d1 shouldBeExactly 1
+                populated.keyboardUsage.activeUsers shouldBeExactly 1
+                populated.keyboardUsage.keyboardUsers shouldBeExactly 1
+                populated.keyboardUsage.chineseCharacters shouldBeExactly 100
+                populated.keyboardUsage.englishCharacters shouldBeExactly 50
+                populated.keyboardUsage.inputSessions shouldBeExactly 4
             }
         } finally {
             factory.close()
@@ -117,6 +135,29 @@ class AdminStatsRepositoryIntegrationTest : FunSpec({
 private class StatsMySqlContainer(image: String) :
     MySQLContainer<StatsMySqlContainer>(image)
 
+private fun seedAdminCreditStats() {
+    TransactionManager.current().exec(
+        """
+        INSERT INTO credit_ledger (
+            id, user_id, entry_type, amount_delta, balance_after,
+            idempotency_key, reference_id, created_at
+        ) VALUES
+            (
+                '50000000-0000-0000-0000-000000000001',
+                '50000000-0000-0000-0000-000000000000',
+                'SIGNUP_TRIAL', 100, 100,
+                'stats-signup-trial', NULL, '2026-08-11 00:00:00.000000'
+            ),
+            (
+                '50000000-0000-0000-0000-000000000002',
+                '50000000-0000-0000-0000-000000000000',
+                'STOREKIT_PURCHASE', 6000, 6100,
+                'stats-storekit-purchase', NULL, '2026-08-11 00:01:00.000000'
+            )
+        """.trimIndent(),
+    )
+}
+
 private fun seedProductAnalytics() {
     TransactionManager.current().exec(
         """
@@ -164,4 +205,20 @@ private fun seedProductAnalytics() {
             """.trimIndent(),
         )
     }
+    TransactionManager.current().exec(
+        """
+        INSERT INTO keyboard_usage_daily_summaries (
+            installation_hash, client_summary_id, summary_date,
+            chinese_character_count, english_character_count, other_character_count,
+            input_session_count, chinese_only_session_count, english_only_session_count,
+            mixed_language_session_count, other_only_session_count,
+            app_version, os_version, payload_hash, received_at
+        ) VALUES (
+            '${"a".repeat(64)}', '50000000-0000-0000-0000-000000000001', '2026-08-11',
+            100, 50, 10,
+            4, 2, 1, 1, 0,
+            '1.0', '18.6', '${"4".repeat(64)}', '2026-08-12 00:10:01.000000'
+        )
+        """.trimIndent(),
+    )
 }
diff --git a/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryTest.kt b/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryTest.kt
index 0dd53ee..7654328 100644
--- a/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/admin/stats/AdminStatsRepositoryTest.kt
@@ -9,11 +9,13 @@ import com.osglab.account.features.admin.stats.repositories.AdminStatsAggregates
 import com.osglab.account.features.admin.stats.repositories.AdminStatsRange
 import com.osglab.account.features.admin.stats.repositories.AdminStatsRepository
 import com.osglab.account.features.admin.stats.repositories.AdminStatsSnapshot
+import com.osglab.account.features.admin.stats.repositories.GRANTED_CREDIT_ENTRY_TYPES
 import com.osglab.account.features.admin.stats.repositories.ReferralBindingAggregateRow
 import com.osglab.account.features.admin.stats.repositories.assembleAdminStats
 import com.osglab.account.features.admin.stats.repositories.toExactLong
 import com.osglab.account.features.admin.stats.services.AdminStatsService
 import com.osglab.account.features.admin.stats.services.AdminReferralSort
+import com.osglab.account.features.credits.domain.LedgerEntryType
 import io.kotest.assertions.throwables.shouldThrow
 import io.kotest.core.spec.style.FunSpec
 import io.kotest.matchers.collections.shouldHaveSize
@@ -41,11 +43,11 @@ class AdminStatsRepositoryTest : FunSpec({
                     registrations = 4,
                     activeUsers = 3,
                     totalCreditBalance = 500,
-                    issuedCredits = 130,
+                    grantedCredits = 130,
                     consumedCredits = 25,
                 ),
                 registrationsByDate = mapOf(LocalDate.parse("2026-08-15") to 4),
-                issuedCreditsByDate = mapOf(LocalDate.parse("2026-08-15") to 130),
+                grantedCreditsByDate = mapOf(LocalDate.parse("2026-08-15") to 130),
                 consumedCreditsByDate = mapOf(LocalDate.parse("2026-08-16") to 25),
                 referralFunnel = AdminReferralFunnelDto(
                     codesCreated = 5,
@@ -104,7 +106,7 @@ class AdminStatsRepositoryTest : FunSpec({
         val snapshot = AdminStatsSnapshot(
             overview = AdminOverviewDto(0, 0, 0, 0, 0, 0),
             registrationsByDate = emptyMap(),
-            issuedCreditsByDate = emptyMap(),
+            grantedCreditsByDate = emptyMap(),
             consumedCreditsByDate = emptyMap(),
             referralFunnel = AdminReferralFunnelDto(
                 codesCreated = 0,
@@ -151,6 +153,17 @@ class AdminStatsRepositoryTest : FunSpec({
         json["usage"]!!.jsonArray.single().jsonObject["requests"]!!.jsonPrimitive.content shouldBe "4"
     }
 
+    test("StoreKit purchases are excluded from granted credit statistics") {
+        GRANTED_CREDIT_ENTRY_TYPES shouldBe setOf(
+            LedgerEntryType.SIGNUP_TRIAL,
+            LedgerEntryType.MANUAL_GRANT,
+            LedgerEntryType.REFERRAL_INVITER,
+            LedgerEntryType.REFERRAL_INVITEE,
+            LedgerEntryType.SUBSCRIPTION_GRANT,
+        )
+        GRANTED_CREDIT_ENTRY_TYPES.contains(LedgerEntryType.STOREKIT_PURCHASE) shouldBe false
+    }
+
     test("database decimal aggregates require an exact Long representation") {
         BigDecimal.valueOf(Long.MAX_VALUE).toExactLong() shouldBeExactly Long.MAX_VALUE
         BigDecimal.valueOf(Long.MIN_VALUE).toExactLong() shouldBeExactly Long.MIN_VALUE
@@ -167,7 +180,7 @@ class AdminStatsRepositoryTest : FunSpec({
         val snapshot = AdminStatsSnapshot(
             overview = AdminOverviewDto(0, 0, 0, 0, 0, 0),
             registrationsByDate = emptyMap(),
-            issuedCreditsByDate = emptyMap(),
+            grantedCreditsByDate = emptyMap(),
             consumedCreditsByDate = emptyMap(),
             referralFunnel = AdminReferralFunnelDto(0, 0, 0, 0, 0),
             referralRanking = listOf(
diff --git a/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRepositoryIntegrationTest.kt b/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRepositoryIntegrationTest.kt
index 02bbbe8..6254375 100644
--- a/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRepositoryIntegrationTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRepositoryIntegrationTest.kt
@@ -8,6 +8,8 @@ import com.osglab.account.features.analytics.domain.AnalyticsIngestResult
 import com.osglab.account.features.analytics.domain.AnalyticsSurface
 import com.osglab.account.features.analytics.models.AnalyticsBatchRequest
 import com.osglab.account.features.analytics.models.AnalyticsEventRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageBatchRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageSummaryRequest
 import com.osglab.account.features.analytics.repositories.ExposedAnalyticsRepository
 import com.osglab.account.features.analytics.services.DefaultAnalyticsService
 import io.kotest.assertions.throwables.shouldThrow
@@ -27,7 +29,7 @@ import org.testcontainers.DockerClientFactory
 import org.testcontainers.containers.MySQLContainer
 
 class AnalyticsRepositoryIntegrationTest : FunSpec({
-    test("V16 repository links accounts replays atomically and cascades account deletion") {
+    test("analytics repository links accounts replays atomically and cascades account deletion") {
         withAnalyticsDatabase { config, databaseFactory ->
             val now = Instant.parse("2026-08-20T01:00:00Z")
             val accountId = UUID.fromString("20000000-0000-0000-0000-000000000001")
@@ -57,6 +59,30 @@ class AnalyticsRepositoryIntegrationTest : FunSpec({
             installationCount(config, installationId.sha256Hex()) shouldBe 1
             linkedAccount(config, installationId.sha256Hex()) shouldBe accountId.toString()
             eventCount(config) shouldBe 1
+            val keyboardUsage = KeyboardUsageBatchRequest(
+                installationId = installationId,
+                summaries = listOf(keyboardSummary()),
+            )
+            service.ingestKeyboardUsage(accountId, keyboardUsage) shouldBe AnalyticsIngestResult(1, 0)
+            service.ingestKeyboardUsage(accountId, keyboardUsage) shouldBe AnalyticsIngestResult(0, 1)
+            shouldThrow<ConflictException> {
+                service.ingestKeyboardUsage(
+                    accountId,
+                    keyboardUsage.copy(
+                        summaries = listOf(
+                            keyboardSummary().copy(
+                                clientSummaryId = "50000000-0000-0000-0000-000000000002",
+                                chineseCharacterCount = 101,
+                            ),
+                        ),
+                    ),
+                )
+            }
+            keyboardSummaryCount(config) shouldBe 1
+            repository.purgeKeyboardUsageSummaries(
+                before = java.time.LocalDate.parse("2026-08-19"),
+                limit = 100,
+            ) shouldBe 0
             repository.recordInvitePageOpen(now)
             repository.recordInvitePageOpen(now.plusSeconds(30))
             scalarInt(
@@ -82,6 +108,31 @@ class AnalyticsRepositoryIntegrationTest : FunSpec({
             }
             concurrentResults.sumOf(AnalyticsIngestResult::accepted) shouldBe 1
             concurrentResults.sumOf(AnalyticsIngestResult::replayed) shouldBe 7
+            val concurrentKeyboardUsage = KeyboardUsageBatchRequest(
+                installationId = concurrentRequest.installationId,
+                summaries = listOf(
+                    keyboardSummary().copy(
+                        clientSummaryId = "50000000-0000-0000-0000-000000000099",
+                    ),
+                ),
+            )
+            val concurrentKeyboardResults = coroutineScope {
+                List(8) {
+                    async { service.ingestKeyboardUsage(null, concurrentKeyboardUsage) }
+                }.awaitAll()
+            }
+            concurrentKeyboardResults.sumOf(AnalyticsIngestResult::accepted) shouldBe 1
+            concurrentKeyboardResults.sumOf(AnalyticsIngestResult::replayed) shouldBe 7
+            markKeyboardSummaryDate(
+                config,
+                "50000000-0000-0000-0000-000000000099",
+                java.time.LocalDate.parse("2026-05-20"),
+            )
+            repository.purgeKeyboardUsageSummaries(
+                before = java.time.LocalDate.parse("2026-05-22"),
+                limit = 100,
+            ) shouldBe 1
+            keyboardSummaryCount(config) shouldBe 1
             markInstallationUpdatedAt(
                 config,
                 concurrentRequest.installationId.sha256Hex(),
@@ -114,6 +165,7 @@ class AnalyticsRepositoryIntegrationTest : FunSpec({
             deleteAccount(config, accountId)
             installationCount(config, installationId.sha256Hex()) shouldBe 0
             eventCount(config) shouldBe 0
+            keyboardSummaryCount(config) shouldBe 0
         }
     }
 })
@@ -129,6 +181,21 @@ private fun event(
     surface = surface,
 )
 
+private fun keyboardSummary() = KeyboardUsageSummaryRequest(
+    clientSummaryId = "50000000-0000-0000-0000-000000000001",
+    summaryDate = "2026-08-19",
+    chineseCharacterCount = 100,
+    englishCharacterCount = 50,
+    otherCharacterCount = 10,
+    inputSessionCount = 4,
+    chineseOnlySessionCount = 2,
+    englishOnlySessionCount = 1,
+    mixedLanguageSessionCount = 1,
+    otherOnlySessionCount = 0,
+    appVersion = "1.0",
+    osVersion = "18.6",
+)
+
 private suspend fun withAnalyticsDatabase(
     block: suspend (DatabaseConfig, DatabaseFactory) -> Unit,
 ) {
@@ -197,6 +264,9 @@ private fun installationCount(config: DatabaseConfig, hash: String): Int =
 private fun eventCount(config: DatabaseConfig): Int =
     scalarInt(config, "SELECT COUNT(*) FROM product_analytics_events")
 
+private fun keyboardSummaryCount(config: DatabaseConfig): Int =
+    scalarInt(config, "SELECT COUNT(*) FROM keyboard_usage_daily_summaries")
+
 private fun linkedAccount(config: DatabaseConfig, hash: String): String? =
     DriverManager.getConnection(config.jdbcUrl, config.username, config.password).use { connection ->
         connection.prepareStatement(
@@ -246,6 +316,22 @@ private fun markInstallationUpdatedAt(
     }
 }
 
+private fun markKeyboardSummaryDate(
+    config: DatabaseConfig,
+    clientSummaryId: String,
+    summaryDate: java.time.LocalDate,
+) {
+    DriverManager.getConnection(config.jdbcUrl, config.username, config.password).use { connection ->
+        connection.prepareStatement(
+            "UPDATE keyboard_usage_daily_summaries SET summary_date = ? WHERE client_summary_id = ?"
+        ).use { statement ->
+            statement.setObject(1, summaryDate)
+            statement.setString(2, clientSummaryId)
+            statement.executeUpdate() shouldBe 1
+        }
+    }
+}
+
 private fun String.sha256Hex(): String =
     MessageDigest.getInstance("SHA-256")
         .digest(toByteArray(Charsets.UTF_8))
diff --git a/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRoutesTest.kt b/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRoutesTest.kt
index e5a70d7..ee96a39 100644
--- a/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRoutesTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsRoutesTest.kt
@@ -6,7 +6,9 @@ import com.osglab.account.common.security.AccountPrincipal
 import com.osglab.account.common.security.installSessionAuthentication
 import com.osglab.account.features.analytics.domain.AnalyticsEventTimeException
 import com.osglab.account.features.analytics.domain.AnalyticsIngestResult
+import com.osglab.account.features.analytics.domain.KeyboardUsageDateException
 import com.osglab.account.features.analytics.models.AnalyticsBatchRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageBatchRequest
 import com.osglab.account.features.analytics.routes.analyticsRoutes
 import com.osglab.account.features.analytics.services.AnalyticsService
 import io.kotest.matchers.shouldBe
@@ -61,6 +63,10 @@ class AnalyticsRoutesTest {
                 contentType(ContentType.Application.Json)
                 setBody(validBody())
             }
+            val keyboardUsage = client.post("/v1/analytics/keyboard-usage") {
+                contentType(ContentType.Application.Json)
+                setBody(validKeyboardUsageBody())
+            }
 
             anonymous.status shouldBe HttpStatusCode.OK
             anonymous.bodyAsText() shouldBe """{"accepted":1,"replayed":0}"""
@@ -68,7 +74,9 @@ class AnalyticsRoutesTest {
             authenticated.bodyAsText() shouldNotContain accountId.toString()
             authenticated.bodyAsText() shouldNotContain "installationId"
             invalidBearer.status shouldBe HttpStatusCode.Unauthorized
-            service.accountIds shouldBe listOf(null, accountId)
+            keyboardUsage.status shouldBe HttpStatusCode.OK
+            keyboardUsage.bodyAsText() shouldBe """{"accepted":1,"replayed":0}"""
+            service.accountIds shouldBe listOf(null, accountId, null)
         }
 
     @Test
@@ -106,6 +114,18 @@ class AnalyticsRoutesTest {
         conflict.bodyAsText() shouldContain """"code":"conflict""""
         invalidTime.status shouldBe HttpStatusCode.UnprocessableEntity
         invalidTime.bodyAsText() shouldContain """"code":"event_time_invalid""""
+
+        val forbiddenKeyboardContent = client.post("/v1/analytics/keyboard-usage") {
+            contentType(ContentType.Application.Json)
+            setBody(validKeyboardUsageBody().replace("\"summaryDate\"", "\"userText\":\"forbidden\",\"summaryDate\""))
+        }
+        val invalidSummaryDate = client.post("/v1/analytics/keyboard-usage") {
+            contentType(ContentType.Application.Json)
+            setBody(validKeyboardUsageBody().replace(INSTALLATION_ID, INVALID_TIME_INSTALLATION_ID))
+        }
+        forbiddenKeyboardContent.status shouldBe HttpStatusCode.BadRequest
+        invalidSummaryDate.status shouldBe HttpStatusCode.UnprocessableEntity
+        invalidSummaryDate.bodyAsText() shouldContain """"code":"summary_date_invalid""""
     }
 
     private fun validBody(): String =
@@ -122,6 +142,26 @@ class AnalyticsRoutesTest {
         }
         """.trimIndent()
 
+    private fun validKeyboardUsageBody(): String =
+        """
+        {
+          "installationId":"$INSTALLATION_ID",
+          "summaries":[{
+            "clientSummaryId":"50000000-0000-0000-0000-000000000001",
+            "summaryDate":"2026-08-19",
+            "chineseCharacterCount":100,
+            "englishCharacterCount":50,
+            "otherCharacterCount":10,
+            "inputSessionCount":4,
+            "chineseOnlySessionCount":2,
+            "englishOnlySessionCount":1,
+            "mixedLanguageSessionCount":1,
+            "otherOnlySessionCount":0,
+            "appVersion":"1.0"
+          }]
+        }
+        """.trimIndent()
+
     private companion object {
         const val INSTALLATION_ID = "10000000-0000-0000-0000-000000000001"
         const val CONFLICT_INSTALLATION_ID = "10000000-0000-0000-0000-000000000002"
@@ -139,6 +179,14 @@ private class RecordingAnalyticsService : AnalyticsService {
         accountIds += accountId
         return AnalyticsIngestResult(accepted = request.events.size, replayed = 0)
     }
+
+    override suspend fun ingestKeyboardUsage(
+        accountId: UUID?,
+        request: KeyboardUsageBatchRequest,
+    ): AnalyticsIngestResult {
+        accountIds += accountId
+        return AnalyticsIngestResult(accepted = request.summaries.size, replayed = 0)
+    }
 }
 
 private class ErrorAnalyticsService : AnalyticsService {
@@ -150,4 +198,12 @@ private class ErrorAnalyticsService : AnalyticsService {
         "10000000-0000-0000-0000-000000000003" -> throw AnalyticsEventTimeException()
         else -> AnalyticsIngestResult(request.events.size, 0)
     }
+
+    override suspend fun ingestKeyboardUsage(
+        accountId: UUID?,
+        request: KeyboardUsageBatchRequest,
+    ): AnalyticsIngestResult = when (request.installationId) {
+        "10000000-0000-0000-0000-000000000003" -> throw KeyboardUsageDateException()
+        else -> AnalyticsIngestResult(request.summaries.size, 0)
+    }
 }
diff --git a/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsServiceTest.kt b/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsServiceTest.kt
index 90e9d0f..3b204bb 100644
--- a/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsServiceTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/analytics/AnalyticsServiceTest.kt
@@ -12,8 +12,12 @@ import com.osglab.account.features.analytics.domain.AnalyticsFailureCategory
 import com.osglab.account.features.analytics.domain.AnalyticsFeature
 import com.osglab.account.features.analytics.domain.AnalyticsIngestResult
 import com.osglab.account.features.analytics.domain.AnalyticsSurface
+import com.osglab.account.features.analytics.domain.KeyboardUsageBatch
+import com.osglab.account.features.analytics.domain.KeyboardUsageDateException
 import com.osglab.account.features.analytics.models.AnalyticsBatchRequest
 import com.osglab.account.features.analytics.models.AnalyticsEventRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageBatchRequest
+import com.osglab.account.features.analytics.models.KeyboardUsageSummaryRequest
 import com.osglab.account.features.analytics.repositories.AnalyticsRepository
 import com.osglab.account.features.analytics.services.AnalyticsMaintenanceService
 import com.osglab.account.features.analytics.services.DefaultAnalyticsService
@@ -24,6 +28,7 @@ import java.security.MessageDigest
 import java.time.Clock
 import java.time.Duration
 import java.time.Instant
+import java.time.LocalDate
 import java.time.ZoneOffset
 import java.util.UUID
 import kotlin.test.Test
@@ -222,6 +227,99 @@ class AnalyticsServiceTest {
             repository.eventCount shouldBe eventCountBeforeConflict
         }
 
+    @Test
+    fun `keyboard usage accepts privacy minimized daily summaries and replays idempotently`(): Unit =
+        kotlinx.coroutines.runBlocking {
+            val repository = InMemoryAnalyticsRepository()
+            val service = service(repository)
+            val request = keyboardBatch(keyboardSummary())
+
+            service.ingestKeyboardUsage(null, request) shouldBe AnalyticsIngestResult(1, 0)
+            service.ingestKeyboardUsage(accountId, request) shouldBe AnalyticsIngestResult(0, 1)
+            repository.lastKeyboardBatch?.installationHash shouldBe installationId.sha256Hex()
+            repository.lastKeyboardBatch.toString() shouldNotContain installationId
+            request.toString() shouldNotContain request.summaries.single().clientSummaryId
+
+            shouldThrow<ConflictException> {
+                service.ingestKeyboardUsage(
+                    accountId,
+                    KeyboardUsageBatchRequest(
+                        installationId,
+                        listOf(
+                            keyboardSummary().copy(
+                                clientSummaryId = uuid(43),
+                                summaryDate = "2026-08-18",
+                            ),
+                            keyboardSummary().copy(
+                                clientSummaryId = uuid(42),
+                                chineseCharacterCount = 101,
+                            ),
+                        ),
+                    ),
+                )
+            }
+            repository.keyboardSummaryCount shouldBe 1
+        }
+
+    @Test
+    fun `keyboard usage validates date count partitions and batch uniqueness before persistence`(): Unit =
+        kotlinx.coroutines.runBlocking {
+            val repository = InMemoryAnalyticsRepository()
+            val service = service(repository)
+
+            listOf(
+                keyboardBatch(keyboardSummary().copy(summaryDate = "2026-08-20")),
+                keyboardBatch(keyboardSummary().copy(summaryDate = "2026-07-15")),
+            ).forEach { invalid ->
+                shouldThrow<KeyboardUsageDateException> {
+                    service.ingestKeyboardUsage(null, invalid)
+                }.code shouldBe "summary_date_invalid"
+            }
+
+            listOf(
+                KeyboardUsageBatchRequest(installationId, emptyList()),
+                keyboardBatch(keyboardSummary().copy(chineseCharacterCount = -1)),
+                keyboardBatch(keyboardSummary().copy(englishCharacterCount = 1_000_001)),
+                keyboardBatch(keyboardSummary().copy(inputSessionCount = 0)),
+                keyboardBatch(keyboardSummary().copy(otherOnlySessionCount = 1)),
+                keyboardBatch(
+                    keyboardSummary().copy(
+                        chineseCharacterCount = 0,
+                        englishCharacterCount = 0,
+                        otherCharacterCount = 0,
+                    ),
+                ),
+                KeyboardUsageBatchRequest(
+                    installationId,
+                    listOf(keyboardSummary(), keyboardSummary().copy(clientSummaryId = uuid(43))),
+                ),
+            ).forEach { invalid ->
+                shouldThrow<InvalidRequestException> {
+                    service.ingestKeyboardUsage(null, invalid)
+                }.code shouldBe "invalid_request"
+            }
+            repository.keyboardSummaryCount shouldBe 0
+        }
+
+    @Test
+    fun `keyboard usage accepts inclusive oldest date and maximum counters`(): Unit =
+        kotlinx.coroutines.runBlocking {
+            val repository = InMemoryAnalyticsRepository()
+            val maximum = keyboardSummary().copy(
+                summaryDate = "2026-07-16",
+                chineseCharacterCount = 1_000_000,
+                englishCharacterCount = 1_000_000,
+                otherCharacterCount = 1_000_000,
+                inputSessionCount = 100_000,
+                chineseOnlySessionCount = 100_000,
+                englishOnlySessionCount = 0,
+                mixedLanguageSessionCount = 0,
+            )
+
+            service(repository).ingestKeyboardUsage(null, keyboardBatch(maximum)) shouldBe
+                AnalyticsIngestResult(1, 0)
+        }
+
     @Test
     fun `maintenance purges only anonymous installations older than ninety days`(): Unit =
         kotlinx.coroutines.runBlocking {
@@ -235,6 +333,8 @@ class AnalyticsServiceTest {
             maintenance.purgeStaleAnonymousInstallations() shouldBe 0
             repository.lastPurgeBefore shouldBe now.minus(Duration.ofDays(90))
             repository.lastPurgeLimit shouldBe 1_000
+            repository.lastKeyboardPurgeBefore shouldBe LocalDate.parse("2026-05-22")
+            repository.lastKeyboardPurgeLimit shouldBe 1_000
         }
 
     private fun service(repository: AnalyticsRepository) =
@@ -248,6 +348,25 @@ class AnalyticsServiceTest {
         events: List<AnalyticsEventRequest>,
     ) = AnalyticsBatchRequest(installationId = installationId, events = events)
 
+    private fun keyboardBatch(
+        summary: KeyboardUsageSummaryRequest,
+    ) = KeyboardUsageBatchRequest(installationId, listOf(summary))
+
+    private fun keyboardSummary() = KeyboardUsageSummaryRequest(
+        clientSummaryId = uuid(41),
+        summaryDate = "2026-08-19",
+        chineseCharacterCount = 100,
+        englishCharacterCount = 50,
+        otherCharacterCount = 10,
+        inputSessionCount = 4,
+        chineseOnlySessionCount = 2,
+        englishOnlySessionCount = 1,
+        mixedLanguageSessionCount = 1,
+        otherOnlySessionCount = 0,
+        appVersion = "1.2.3",
+        osVersion = "18.6",
+    )
+
     private fun firstOpen() = event(
         id = uuid(1),
         type = AnalyticsEventType.FIRST_OPEN,
@@ -293,15 +412,30 @@ class AnalyticsServiceTest {
 private class InMemoryAnalyticsRepository : AnalyticsRepository {
     private val linkedAccounts = mutableMapOf<String, UUID?>()
     private val payloads = mutableMapOf<Pair<String, UUID>, String>()
+    private val keyboardPayloadsById = mutableMapOf<Pair<String, UUID>, String>()
+    private val keyboardPayloadsByDate = mutableMapOf<Pair<String, LocalDate>, String>()
     var lastBatch: AnalyticsBatch? = null
         private set
+    var lastKeyboardBatch: KeyboardUsageBatch? = null
+        private set
     val eventCount: Int get() = payloads.size
+    val keyboardSummaryCount: Int get() = keyboardPayloadsById.size
     var lastPurgeBefore: Instant? = null
         private set
     var lastPurgeLimit: Int? = null
         private set
+    var lastKeyboardPurgeBefore: LocalDate? = null
+        private set
+    var lastKeyboardPurgeLimit: Int? = null
+        private set
 
     override suspend fun recordInvitePageOpen(occurredAt: Instant) = Unit
+    override suspend fun purgeKeyboardUsageSummaries(before: LocalDate, limit: Int): Int {
+        lastKeyboardPurgeBefore = before
+        lastKeyboardPurgeLimit = limit
+        return 0
+    }
+
     override suspend fun purgeAnonymousInstallations(before: Instant, limit: Int): Int {
         lastPurgeBefore = before
         lastPurgeLimit = limit
@@ -343,6 +477,48 @@ private class InMemoryAnalyticsRepository : AnalyticsRepository {
         lastBatch = batch
         return AnalyticsIngestResult(accepted, replayed)
     }
+
+    override suspend fun ingestKeyboardUsage(batch: KeyboardUsageBatch): AnalyticsIngestResult {
+        val accountsCopy = linkedAccounts.toMutableMap()
+        val idPayloadsCopy = keyboardPayloadsById.toMutableMap()
+        val datePayloadsCopy = keyboardPayloadsByDate.toMutableMap()
+        val existingAccount = accountsCopy[batch.installationHash]
+        if (batch.installationHash !in accountsCopy) {
+            accountsCopy[batch.installationHash] = batch.accountId
+        } else if (batch.accountId != null) {
+            when {
+                existingAccount == null -> accountsCopy[batch.installationHash] = batch.accountId
+                existingAccount != batch.accountId ->
+                    throw ConflictException("Installation is linked to another account")
+            }
+        }
+
+        var accepted = 0
+        var replayed = 0
+        batch.summaries.forEach { summary ->
+            val idKey = batch.installationHash to summary.clientSummaryId
+            val dateKey = batch.installationHash to summary.summaryDate
+            val existingHashes = setOfNotNull(idPayloadsCopy[idKey], datePayloadsCopy[dateKey])
+            when {
+                existingHashes.isEmpty() -> {
+                    idPayloadsCopy[idKey] = summary.payloadHash
+                    datePayloadsCopy[dateKey] = summary.payloadHash
+                    accepted += 1
+                }
+                existingHashes.size == 1 && existingHashes.single() == summary.payloadHash ->
+                    replayed += 1
+                else -> throw ConflictException("Keyboard usage summary conflict")
+            }
+        }
+        linkedAccounts.clear()
+        linkedAccounts.putAll(accountsCopy)
+        keyboardPayloadsById.clear()
+        keyboardPayloadsById.putAll(idPayloadsCopy)
+        keyboardPayloadsByDate.clear()
+        keyboardPayloadsByDate.putAll(datePayloadsCopy)
+        lastKeyboardBatch = batch
+        return AnalyticsIngestResult(accepted, replayed)
+    }
 }
 
 private fun String.sha256Hex(): String =
diff --git a/src/test/kotlin/com/osglab/account/features/content/InMemoryContentRepository.kt b/src/test/kotlin/com/osglab/account/features/content/InMemoryContentRepository.kt
new file mode 100644
index 0000000..5f1de43
--- /dev/null
+++ b/src/test/kotlin/com/osglab/account/features/content/InMemoryContentRepository.kt
@@ -0,0 +1,85 @@
+package com.osglab.account.features.content
+
+import com.osglab.account.features.admin.models.NewAdminAuditEvent
+import com.osglab.account.features.content.models.ContentMutationResult
+import com.osglab.account.features.content.models.HintPackRecord
+import com.osglab.account.features.content.models.OfficialSkillRecord
+import com.osglab.account.features.content.models.SkillCatalogRecord
+import com.osglab.account.features.content.repositories.ContentRepository
+import java.time.Instant
+
+internal class InMemoryContentRepository : ContentRepository {
+    private val skills = linkedMapOf<String, OfficialSkillRecord>()
+    private val hints = linkedMapOf<String, HintPackRecord>()
+    val audits = mutableListOf<NewAdminAuditEvent>()
+    var revision = 0L
+    var generatedAt: Instant? = null
+
+    override suspend fun getSkillCatalog(enabledOnly: Boolean): SkillCatalogRecord =
+        SkillCatalogRecord(
+            revision = revision,
+            generatedAt = generatedAt,
+            skills = skills.values
+                .filter { !enabledOnly || it.enabled }
+                .sortedWith(compareBy(OfficialSkillRecord::sortOrder, OfficialSkillRecord::id)),
+        )
+
+    override suspend fun createSkill(
+        skill: OfficialSkillRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult {
+        if (skills.containsKey(skill.id)) return ContentMutationResult.CONFLICT
+        skills[skill.id] = skill
+        publish(now, audit)
+        return ContentMutationResult.SUCCESS
+    }
+
+    override suspend fun updateSkill(
+        skill: OfficialSkillRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult {
+        val current = skills[skill.id] ?: return ContentMutationResult.NOT_FOUND
+        skills[skill.id] = skill.copy(enabled = current.enabled)
+        publish(now, audit)
+        return ContentMutationResult.SUCCESS
+    }
+
+    override suspend fun setSkillEnabled(
+        id: String,
+        enabled: Boolean,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): ContentMutationResult {
+        val current = skills[id] ?: return ContentMutationResult.NOT_FOUND
+        if (enabled && !current.enabled && skills.values.count(OfficialSkillRecord::enabled) >= 100) {
+            return ContentMutationResult.LIMIT_EXCEEDED
+        }
+        skills[id] = current.copy(enabled = enabled)
+        publish(now, audit)
+        return ContentMutationResult.SUCCESS
+    }
+
+    override suspend fun listHintPacks(): List<HintPackRecord> =
+        hints.values.sortedBy(HintPackRecord::locale)
+
+    override suspend fun getHintPack(locale: String): HintPackRecord? = hints[locale]
+
+    override suspend fun putHintPack(
+        pack: HintPackRecord,
+        now: Instant,
+        audit: NewAdminAuditEvent,
+    ): HintPackRecord {
+        val stored = pack.copy(version = (hints[pack.locale]?.version ?: 0) + 1)
+        hints[pack.locale] = stored
+        audits += audit
+        return stored
+    }
+
+    private fun publish(now: Instant, audit: NewAdminAuditEvent) {
+        revision += 1
+        generatedAt = now
+        audits += audit
+    }
+}
diff --git a/src/test/kotlin/com/osglab/account/features/content/repositories/ContentRepositoryIntegrationTest.kt b/src/test/kotlin/com/osglab/account/features/content/repositories/ContentRepositoryIntegrationTest.kt
new file mode 100644
index 0000000..2a4d4fc
--- /dev/null
+++ b/src/test/kotlin/com/osglab/account/features/content/repositories/ContentRepositoryIntegrationTest.kt
@@ -0,0 +1,158 @@
+package com.osglab.account.features.content.repositories
+
+import com.osglab.account.config.DatabaseConfig
+import com.osglab.account.config.DatabaseFactory
+import com.osglab.account.features.admin.models.AdminAuditAction
+import com.osglab.account.features.admin.models.AdminAuditOutcome
+import com.osglab.account.features.admin.models.NewAdminAuditEvent
+import com.osglab.account.features.admin.repositories.ExposedAdminRepository
+import com.osglab.account.features.content.models.HintPackRecord
+import com.osglab.account.features.content.models.OfficialSkillRecord
+import com.osglab.account.features.content.models.SkillLocalizationDto
+import com.osglab.account.features.content.models.SkillLocalizationsDto
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.collections.shouldContainExactlyInAnyOrder
+import io.kotest.matchers.shouldBe
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
+import kotlinx.coroutines.coroutineScope
+import org.opentest4j.TestAbortedException
+import org.testcontainers.DockerClientFactory
+import org.testcontainers.containers.MySQLContainer
+import java.time.Instant
+
+class ContentRepositoryIntegrationTest : FunSpec({
+    test("skill revision publication and audit are atomic") {
+        withContentRepositories { first, _, admin ->
+            val now = Instant.parse("2026-08-21T04:00:00Z")
+            val skill = officialSkill()
+
+            first.createSkill(skill, now, audit(AdminAuditAction.CONTENT_SKILL_CREATED, skill.id, now))
+            first.getSkillCatalog(enabledOnly = true).run {
+                revision shouldBe 1
+                skills shouldBe emptyList()
+            }
+
+            first.setSkillEnabled(
+                skill.id,
+                enabled = true,
+                now = now.plusSeconds(1),
+                audit = audit(AdminAuditAction.CONTENT_SKILL_ENABLED, skill.id, now.plusSeconds(1)),
+            )
+
+            first.getSkillCatalog(enabledOnly = true).run {
+                revision shouldBe 2
+                generatedAt shouldBe now.plusSeconds(1)
+                skills.single().localizations.en.name shouldBe "Polish"
+            }
+            admin.listAudit(10).map { it.action }.toSet() shouldBe setOf(
+                AdminAuditAction.CONTENT_SKILL_CREATED,
+                AdminAuditAction.CONTENT_SKILL_ENABLED,
+            )
+        }
+    }
+
+    test("concurrent hint publication assigns monotonic versions") {
+        withContentRepositories { first, second, _ ->
+            val now = Instant.parse("2026-08-21T04:00:00Z")
+            val versions = coroutineScope {
+                listOf(first, second).mapIndexed { index, repository ->
+                    async {
+                        repository.putHintPack(
+                            HintPackRecord(
+                                locale = "zh",
+                                generatedAt = now,
+                                expiresAt = null,
+                                intervalHours = 12,
+                                version = 0,
+                                cardsJson = "[]",
+                            ),
+                            now.plusSeconds(index.toLong()),
+                            audit(
+                                AdminAuditAction.CONTENT_HINT_PACK_PUBLISHED,
+                                "zh",
+                                now.plusSeconds(index.toLong()),
+                            ),
+                        ).version
+                    }
+                }.awaitAll()
+            }
+
+            versions shouldContainExactlyInAnyOrder listOf(1, 2)
+            first.getHintPack("zh")?.version shouldBe 2
+        }
+    }
+})
+
+private suspend fun withContentRepositories(
+    block: suspend (ExposedContentRepository, ExposedContentRepository, ExposedAdminRepository) -> Unit,
+) {
+    val externalJdbcUrl = System.getenv("TEST_MYSQL_JDBC_URL")?.takeIf(String::isNotBlank)
+    if (externalJdbcUrl == null && !DockerClientFactory.instance().isDockerAvailable) {
+        throw TestAbortedException("Docker is unavailable; MySQL integration test skipped")
+    }
+    val mysql = if (externalJdbcUrl == null) {
+        ContentMySqlContainer("mysql:8.4")
+            .withDatabaseName("osg_content_repository_test")
+            .withUsername("test")
+            .withPassword("test")
+            .also(ContentMySqlContainer::start)
+    } else {
+        null
+    }
+    val config = DatabaseConfig(
+        jdbcUrl = externalJdbcUrl ?: requireNotNull(mysql).jdbcUrl,
+        username = System.getenv("TEST_MYSQL_USER")?.takeIf(String::isNotBlank)
+            ?: mysql?.username
+            ?: "root",
+        password = System.getenv("TEST_MYSQL_PASSWORD") ?: mysql?.password ?: "",
+        maximumPoolSize = 4,
+    )
+    val firstFactory = DatabaseFactory(config)
+    val secondFactory = DatabaseFactory(config)
+    try {
+        firstFactory.database
+        secondFactory.database
+        block(
+            ExposedContentRepository(firstFactory),
+            ExposedContentRepository(secondFactory),
+            ExposedAdminRepository(firstFactory),
+        )
+    } finally {
+        secondFactory.close()
+        firstFactory.close()
+        mysql?.stop()
+    }
+}
+
+private fun officialSkill() = OfficialSkillRecord(
+    id = "official.polish",
+    systemImage = "wand.and.sparkles",
+    sortOrder = 10,
+    thinkingEnabled = false,
+    enabled = false,
+    localizations = SkillLocalizationsDto(
+        SkillLocalizationDto("润色", "优化表达", "请润色"),
+        SkillLocalizationDto("Polish", "Improve wording", "Please polish"),
+    ),
+)
+
+private fun audit(
+    action: AdminAuditAction,
+    targetId: String,
+    now: Instant,
+) = NewAdminAuditEvent(
+    actorOperatorId = null,
+    action = action,
+    outcome = AdminAuditOutcome.SUCCESS,
+    targetType = if (action == AdminAuditAction.CONTENT_HINT_PACK_PUBLISHED) {
+        "OFFICIAL_HINT_PACK"
+    } else {
+        "OFFICIAL_SKILL"
+    },
+    targetId = targetId,
+    occurredAt = now,
+)
+
+private class ContentMySqlContainer(image: String) :
+    MySQLContainer<ContentMySqlContainer>(image)
diff --git a/src/test/kotlin/com/osglab/account/features/content/routes/ContentRoutesTest.kt b/src/test/kotlin/com/osglab/account/features/content/routes/ContentRoutesTest.kt
new file mode 100644
index 0000000..2c23d74
--- /dev/null
+++ b/src/test/kotlin/com/osglab/account/features/content/routes/ContentRoutesTest.kt
@@ -0,0 +1,235 @@
+package com.osglab.account.features.content.routes
+
+import com.osglab.account.config.AdminConfig
+import com.osglab.account.config.AppConfig
+import com.osglab.account.features.admin.models.AdminPrincipal
+import com.osglab.account.features.admin.models.AdminRole
+import com.osglab.account.features.admin.routes.adminContentRoutes
+import com.osglab.account.features.admin.services.AdminSessionService
+import com.osglab.account.features.content.InMemoryContentRepository
+import com.osglab.account.features.content.models.AIHintCardDto
+import com.osglab.account.features.content.models.CreateOfficialSkillRequest
+import com.osglab.account.features.content.models.SkillLocalizationDto
+import com.osglab.account.features.content.models.SkillLocalizationsDto
+import com.osglab.account.features.content.models.UpdateHintPackRequest
+import com.osglab.account.features.content.services.ContentService
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldContain
+import io.ktor.client.request.get
+import io.ktor.client.request.header
+import io.ktor.client.request.post
+import io.ktor.client.request.setBody
+import io.ktor.client.statement.bodyAsText
+import io.ktor.http.ContentType
+import io.ktor.http.HttpHeaders
+import io.ktor.http.HttpStatusCode
+import io.ktor.http.contentType
+import io.ktor.serialization.kotlinx.json.json
+import io.ktor.server.application.install
+import io.ktor.server.plugins.contentnegotiation.ContentNegotiation
+import io.ktor.server.routing.route
+import io.ktor.server.routing.routing
+import io.ktor.server.testing.testApplication
+import io.mockk.coEvery
+import io.mockk.every
+import io.mockk.mockk
+import kotlinx.serialization.json.Json
+import java.util.UUID
+import kotlin.test.Test
+
+class ContentRoutesTest {
+    @Test
+    fun `public skills are anonymous cacheable and support conditional requests`() = testApplication {
+        val service = seededContentService()
+        application {
+            installContentJson()
+            routing { contentRoutes(service) }
+        }
+
+        val first = client.get("/v1/content/skills")
+        val etag = first.headers[HttpHeaders.ETag]
+
+        first.status shouldBe HttpStatusCode.OK
+        first.headers[HttpHeaders.CacheControl] shouldBe "public,max-age=300"
+        first.bodyAsText() shouldContain """"schemaVersion":1"""
+        first.bodyAsText() shouldContain """"id":"official.polish""""
+
+        val cached = client.get("/v1/content/skills") {
+            header(HttpHeaders.IfNoneMatch, requireNotNull(etag))
+        }
+        cached.status shouldBe HttpStatusCode.NotModified
+        cached.headers[HttpHeaders.ETag] shouldBe etag
+    }
+
+    @Test
+    fun `public hint manifest and packs preserve client fields and etags`() = testApplication {
+        val service = ContentService(InMemoryContentRepository())
+        service.putHintPack(
+            principal(AdminRole.SUPER_ADMIN),
+            "en",
+            UpdateHintPackRequest(
+                generatedAt = "2026-08-21T04:00:00Z",
+                expiresAt = "2026-08-22T04:00:00Z",
+                intervalHours = 12,
+                cards = listOf(
+                    AIHintCardDto(
+                        id = "daily-brief",
+                        text = "Daily brief",
+                        prompt = "Summarize today's news",
+                        category = "daily",
+                        priority = 80,
+                        source = "official",
+                        locale = "en",
+                        conditions = listOf("idle"),
+                    ),
+                ),
+            ),
+            null,
+        )
+        application {
+            installContentJson()
+            routing { contentRoutes(service) }
+        }
+
+        val manifest = client.get("/v1/content/hints/manifest")
+        val legacyManifest = client.get("/hints/manifest.json")
+        manifest.status shouldBe HttpStatusCode.OK
+        manifest.bodyAsText() shouldContain """"locales":["en"]"""
+        manifest.bodyAsText() shouldContain """"en":"/v1/content/hints/en""""
+        legacyManifest.bodyAsText() shouldBe manifest.bodyAsText()
+        legacyManifest.headers[HttpHeaders.ETag] shouldBe manifest.headers[HttpHeaders.ETag]
+        legacyManifest.headers[HttpHeaders.CacheControl] shouldBe manifest.headers[HttpHeaders.CacheControl]
+
+        val pack = client.get("/v1/content/hints/en")
+        val legacyPack = client.get("/hints/hints-en.json")
+        val etag = requireNotNull(pack.headers[HttpHeaders.ETag])
+        pack.status shouldBe HttpStatusCode.OK
+        pack.bodyAsText() shouldContain """"version":1"""
+        pack.bodyAsText() shouldContain """"text":"Daily brief""""
+        legacyPack.bodyAsText() shouldBe pack.bodyAsText()
+        legacyPack.headers[HttpHeaders.ETag] shouldBe etag
+        legacyPack.headers[HttpHeaders.CacheControl] shouldBe pack.headers[HttpHeaders.CacheControl]
+        client.get("/v1/content/hints/en") {
+            header(HttpHeaders.IfNoneMatch, etag)
+        }.status shouldBe HttpStatusCode.NotModified
+        client.get("/hints/hints-en.json") {
+            header(HttpHeaders.IfNoneMatch, etag)
+        }.status shouldBe HttpStatusCode.NotModified
+        client.get("/v1/content/hints/fr").status shouldBe HttpStatusCode.NotFound
+        client.get("/hints/hints-fr.json").status shouldBe HttpStatusCode.NotFound
+    }
+
+    @Test
+    fun `only super admin can mutate content with valid csrf`() = testApplication {
+        val service = ContentService(InMemoryContentRepository())
+        val sessions = sessionService(AdminRole.SUPPORT)
+        application {
+            installContentJson()
+            routing {
+                route("/v1/admin") {
+                    adminContentRoutes(adminConfig(), sessions, service)
+                }
+            }
+        }
+
+        val response = client.post("/v1/admin/content/skills") {
+            header(HttpHeaders.Origin, "https://account.osglab.com")
+            header(HttpHeaders.Cookie, "osg_admin_session=session-token")
+            header("X-CSRF-Token", "csrf-token")
+            contentType(ContentType.Application.Json)
+            setBody(SKILL_BODY)
+        }
+
+        response.status shouldBe HttpStatusCode.Forbidden
+        response.bodyAsText() shouldContain """"code":"INSUFFICIENT_PERMISSION""""
+    }
+
+    @Test
+    fun `super admin mutation publishes through admin route`() = testApplication {
+        val repository = InMemoryContentRepository()
+        val service = ContentService(repository)
+        application {
+            installContentJson()
+            routing {
+                route("/v1/admin") {
+                    adminContentRoutes(adminConfig(), sessionService(AdminRole.SUPER_ADMIN), service)
+                }
+            }
+        }
+
+        val response = client.post("/v1/admin/content/skills") {
+            header(HttpHeaders.Origin, "https://account.osglab.com")
+            header(HttpHeaders.Cookie, "osg_admin_session=session-token")
+            header("X-CSRF-Token", "csrf-token")
+            contentType(ContentType.Application.Json)
+            setBody(SKILL_BODY)
+        }
+
+        response.status shouldBe HttpStatusCode.Created
+        response.bodyAsText() shouldContain """"enabled":false"""
+        repository.revision shouldBe 1
+    }
+}
+
+private fun io.ktor.server.application.Application.installContentJson() {
+    install(ContentNegotiation) {
+        json(
+            Json {
+                explicitNulls = false
+                encodeDefaults = true
+            },
+        )
+    }
+}
+
+private suspend fun seededContentService(): ContentService {
+    val service = ContentService(InMemoryContentRepository())
+    val actor = principal(AdminRole.SUPER_ADMIN)
+    service.createSkill(
+        actor,
+        CreateOfficialSkillRequest(
+            id = "official.polish",
+            systemImage = "wand.and.sparkles",
+            sortOrder = 1,
+            thinkingEnabled = false,
+            localizations = SkillLocalizationsDto(
+                SkillLocalizationDto("润色", "优化表达", "润色文本"),
+                SkillLocalizationDto("Polish", "Improve wording", "Polish text"),
+            ),
+        ),
+        null,
+    )
+    service.setSkillEnabled(actor, "official.polish", true, null)
+    return service
+}
+
+private fun sessionService(role: AdminRole): AdminSessionService =
+    mockk<AdminSessionService>().also {
+        coEvery { it.authenticate("session-token") } returns principal(role)
+        coEvery { it.authenticateMutation("session-token", "csrf-token") } returns principal(role)
+    }
+
+private fun principal(role: AdminRole) = AdminPrincipal(
+    operatorId = UUID.fromString("11111111-1111-4111-8111-111111111111"),
+    sessionId = UUID.fromString("22222222-2222-4222-8222-222222222222"),
+    normalizedUsername = "operator",
+    role = role,
+)
+
+private fun adminConfig() = mockk<AppConfig> {
+    every { publicBaseUrl } returns "https://account.osglab.com"
+    every { admin } returns AdminConfig(mtlsRequired = false)
+}
+
+private const val SKILL_BODY = """
+{
+  "id": "official.polish",
+  "systemImage": "wand.and.sparkles",
+  "sortOrder": 10,
+  "thinkingEnabled": false,
+  "localizations": {
+    "zh-Hans": {"name": "润色", "summary": "优化表达", "prompt": "请润色"},
+    "en": {"name": "Polish", "summary": "Improve wording", "prompt": "Please polish"}
+  }
+}
+"""
diff --git a/src/test/kotlin/com/osglab/account/features/content/services/ContentServiceTest.kt b/src/test/kotlin/com/osglab/account/features/content/services/ContentServiceTest.kt
new file mode 100644
index 0000000..edf1e1d
--- /dev/null
+++ b/src/test/kotlin/com/osglab/account/features/content/services/ContentServiceTest.kt
@@ -0,0 +1,222 @@
+package com.osglab.account.features.content.services
+
+import com.osglab.account.features.admin.models.AdminAuditAction
+import com.osglab.account.features.admin.models.AdminPrincipal
+import com.osglab.account.features.admin.models.AdminRole
+import com.osglab.account.features.content.InMemoryContentRepository
+import com.osglab.account.features.content.models.AIHintCardDto
+import com.osglab.account.features.content.models.CreateOfficialSkillRequest
+import com.osglab.account.features.content.models.SkillLocalizationDto
+import com.osglab.account.features.content.models.SkillLocalizationsDto
+import com.osglab.account.features.content.models.UpdateHintPackRequest
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.matchers.shouldBe
+import kotlinx.coroutines.runBlocking
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.jsonArray
+import kotlinx.serialization.json.jsonObject
+import java.time.Clock
+import java.time.Instant
+import java.time.ZoneOffset
+import java.util.UUID
+
+class ContentServiceTest : FunSpec({
+    val now = Instant.parse("2026-08-21T04:00:00Z")
+
+    test("skill mutations increment revision and disabled skills stay private") {
+        val repository = InMemoryContentRepository()
+        val service = ContentService(repository, Clock.fixed(now, ZoneOffset.UTC))
+
+        service.createSkill(actor(), skillRequest(), "request-create")
+        service.adminSkills().run {
+            revision shouldBe 1
+            skills.single().enabled shouldBe false
+        }
+        service.publicSkills().skills shouldBe emptyList()
+
+        service.setSkillEnabled(actor(), "official.polish", true, "request-enable")
+
+        service.publicSkills().run {
+            revision shouldBe 2
+            generatedAt shouldBe now.toString()
+            skills.single().run {
+                id shouldBe "official.polish"
+                kind shouldBe "transform"
+                localizations.zhHans.name shouldBe "润色"
+            }
+        }
+        repository.audits.map { it.action } shouldBe listOf(
+            AdminAuditAction.CONTENT_SKILL_CREATED,
+            AdminAuditAction.CONTENT_SKILL_ENABLED,
+        )
+    }
+
+    test("public Skill DTO accepts exact client maxima and rejects every overflow") {
+        val repository = InMemoryContentRepository()
+        val service = ContentService(repository, Clock.fixed(now, ZoneOffset.UTC))
+        val maximumId = "official." + "." + "a".repeat(89) + "-"
+        val maximumLocalization = SkillLocalizationDto(
+            name = "n".repeat(40),
+            summary = "s".repeat(200),
+            prompt = "p".repeat(6_000),
+        )
+        val maximum = CreateOfficialSkillRequest(
+            id = maximumId,
+            systemImage = "i".repeat(100),
+            sortOrder = 100_000,
+            thinkingEnabled = true,
+            localizations = SkillLocalizationsDto(maximumLocalization, maximumLocalization),
+        )
+
+        service.createSkill(actor(), maximum, "maximum")
+        service.setSkillEnabled(actor(), maximumId, true, "maximum-enable")
+        val catalog = service.publicSkills()
+        catalog.schemaVersion shouldBe 1
+        catalog.revision shouldBe 2
+        catalog.skills.single().run {
+            id shouldBe maximumId
+            systemImage.length shouldBe 100
+            sortOrder shouldBe 100_000
+            kind shouldBe "transform"
+            thinkingEnabled shouldBe true
+            localizations.zhHans shouldBe maximumLocalization
+            localizations.en shouldBe maximumLocalization
+        }
+        val catalogJson = CONTRACT_JSON.encodeToJsonElement(
+            com.osglab.account.features.content.models.SkillCatalogResponse.serializer(),
+            catalog,
+        ).jsonObject
+        catalogJson.keys shouldBe setOf("schemaVersion", "revision", "generatedAt", "skills")
+        val skillJson = catalogJson.getValue("skills").jsonArray.single().jsonObject
+        skillJson.keys shouldBe setOf(
+            "id",
+            "systemImage",
+            "sortOrder",
+            "kind",
+            "thinkingEnabled",
+            "localizations",
+        )
+        skillJson.getValue("localizations").jsonObject.keys shouldBe setOf("zh-Hans", "en")
+
+        val invalidRequests = listOf(
+            maximum.copy(id = "official." + "a".repeat(92)),
+            maximum.copy(systemImage = "i".repeat(101)),
+            maximum.copy(sortOrder = -1),
+            maximum.copy(sortOrder = 100_001),
+            maximum.copy(
+                localizations = maximum.localizations.copy(
+                    zhHans = maximumLocalization.copy(name = "n".repeat(41)),
+                ),
+            ),
+            maximum.copy(
+                localizations = maximum.localizations.copy(
+                    zhHans = maximumLocalization.copy(summary = "s".repeat(201)),
+                ),
+            ),
+            maximum.copy(
+                localizations = maximum.localizations.copy(
+                    zhHans = maximumLocalization.copy(prompt = "p".repeat(6_001)),
+                ),
+            ),
+        )
+        invalidRequests.forEach { request ->
+            shouldThrow<ContentException> {
+                runBlocking { service.createSkill(actor(), request, "overflow") }
+            }.code shouldBe ContentErrorCode.VALIDATION_ERROR
+        }
+    }
+
+    test("hint publishing validates locale and increments each locale version") {
+        val repository = InMemoryContentRepository()
+        val service = ContentService(repository, Clock.fixed(now, ZoneOffset.UTC))
+        val request = UpdateHintPackRequest(
+            generatedAt = now.toString(),
+            expiresAt = now.plusSeconds(3_600).toString(),
+            intervalHours = 12,
+            cards = listOf(
+                AIHintCardDto(
+                    id = "daily-1",
+                    text = "今日热点",
+                    prompt = "请概括今日热点",
+                    category = "daily",
+                    priority = 80,
+                    source = "official",
+                    locale = "zh",
+                ),
+            ),
+        )
+
+        service.putHintPack(actor(), "zh", request, "hint-1").version shouldBe 1
+        service.putHintPack(actor(), "zh", request, "hint-2").version shouldBe 2
+        service.publicHintPack("zh").run {
+            version shouldBe 2
+            cards.single().text shouldBe "今日热点"
+        }
+        service.hintManifest().run {
+            locales shouldBe listOf("zh")
+            intervalHours shouldBe 12
+            files shouldBe mapOf("zh" to "/v1/content/hints/zh")
+        }
+
+        shouldThrow<ContentException> {
+            runBlocking { service.putHintPack(actor(), "fr", request, "invalid") }
+        }.code shouldBe ContentErrorCode.VALIDATION_ERROR
+    }
+
+    test("client contract rejects non-official IDs and mismatched card locales") {
+        val service = ContentService(
+            InMemoryContentRepository(),
+            Clock.fixed(now, ZoneOffset.UTC),
+        )
+
+        shouldThrow<ContentException> {
+            runBlocking {
+                service.createSkill(actor(), skillRequest().copy(id = "custom.polish"), null)
+            }
+        }.code shouldBe ContentErrorCode.VALIDATION_ERROR
+
+        shouldThrow<ContentException> {
+            runBlocking {
+                service.putHintPack(
+                    actor(),
+                    "en",
+                    UpdateHintPackRequest(
+                        cards = listOf(
+                            AIHintCardDto(
+                                id = "wrong-locale",
+                                displayText = "提示",
+                                prompt = "prompt",
+                                locale = "zh",
+                            ),
+                        ),
+                    ),
+                    null,
+                )
+            }
+        }.code shouldBe ContentErrorCode.VALIDATION_ERROR
+    }
+})
+
+private fun actor() = AdminPrincipal(
+    operatorId = UUID.fromString("11111111-1111-4111-8111-111111111111"),
+    sessionId = UUID.fromString("22222222-2222-4222-8222-222222222222"),
+    normalizedUsername = "owner",
+    role = AdminRole.SUPER_ADMIN,
+)
+
+private fun skillRequest() = CreateOfficialSkillRequest(
+    id = "official.polish",
+    systemImage = "wand.and.sparkles",
+    sortOrder = 10,
+    thinkingEnabled = false,
+    localizations = SkillLocalizationsDto(
+        zhHans = SkillLocalizationDto("润色", "优化表达", "请润色以下文本"),
+        en = SkillLocalizationDto("Polish", "Improve wording", "Polish the following text"),
+    ),
+)
+
+private val CONTRACT_JSON = Json {
+    encodeDefaults = true
+    explicitNulls = true
+}
diff --git a/src/test/kotlin/com/osglab/account/features/credits/CreditServiceTest.kt b/src/test/kotlin/com/osglab/account/features/credits/CreditServiceTest.kt
index c56b60b..b71437c 100644
--- a/src/test/kotlin/com/osglab/account/features/credits/CreditServiceTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/credits/CreditServiceTest.kt
@@ -13,6 +13,7 @@ import com.osglab.account.features.credits.domain.UsageMeasurement
 import com.osglab.account.features.credits.domain.externalIdempotencyKey
 import com.osglab.account.features.credits.services.CreditService
 import com.osglab.account.features.credits.services.ReferralRewardConfig
+import com.osglab.account.features.credits.services.signupTrialIdempotencyKey
 import com.osglab.account.features.referrals.domain.ReferralBinding
 import com.osglab.account.features.referrals.domain.ReferralCampaign
 import com.osglab.account.features.referrals.domain.ReferralCampaignBudget
@@ -107,6 +108,17 @@ class CreditServiceTest : FunSpec({
         store.ledger.filter { it.type == LedgerEntryType.SIGNUP_TRIAL } shouldHaveSize 1
     }
 
+    test("signup trial ledger is the authoritative account-level claim record") {
+        val store = storeWithRates(now)
+        val service = service(store, now)
+        val userId = UUID.randomUUID()
+
+        service.hasSignupTrial(userId) shouldBe false
+        service.grantSignupTrial(userId, 100, signupTrialIdempotencyKey(userId))
+
+        service.hasSignupTrial(userId) shouldBe true
+    }
+
     test("manual grant appends one linked audit and ledger entry") {
         val store = storeWithRates(now)
         val service = service(store, now)
diff --git a/src/test/kotlin/com/osglab/account/features/integrity/DeviceCheckTest.kt b/src/test/kotlin/com/osglab/account/features/integrity/DeviceCheckTest.kt
index 7d08f42..c9acecf 100644
--- a/src/test/kotlin/com/osglab/account/features/integrity/DeviceCheckTest.kt
+++ b/src/test/kotlin/com/osglab/account/features/integrity/DeviceCheckTest.kt
@@ -79,7 +79,10 @@ class DeviceCheckTest : FunSpec({
             policy = IntegrityPolicy.ENFORCE,
         )
 
-        service.claimAndGrant(UUID.randomUUID(), Base64.getEncoder().encodeToString(ByteArray(32))).shouldBeFalse()
+        service.claimAndGrant(
+            UUID.randomUUID(),
+            Base64.getEncoder().encodeToString(ByteArray(32)),
+        ) shouldBe SignupTrialClaimResult.INELIGIBLE
         updates shouldBe 0
         grants shouldBe 0
         repository.claims.values.single().status shouldBe TrialClaimStatus.REJECTED
@@ -109,11 +112,63 @@ class DeviceCheckTest : FunSpec({
         )
 
         service.claimAndGrant(UUID.randomUUID(), Base64.getEncoder().encodeToString(ByteArray(32) { 1 }))
-            .shouldBeTrue()
+            .shouldBe(SignupTrialClaimResult.GRANTED)
         (events.indexOf("apple") < events.indexOf("credits")) shouldBe true
         events shouldBe listOf("apple", "APPLE_MARKED", "credits", "COMPLETED")
     }
 
+    test("repeat sign-in with a fresh ephemeral token keeps an already granted account eligible") {
+        val accountId = UUID.randomUUID()
+        val grantedAccounts = mutableSetOf<UUID>()
+        var appleBit = false
+        var queries = 0
+        val service = DeviceCheckTrialService(
+            repository = InMemoryTrialRepository(),
+            client = object : AppleDeviceCheckClient {
+                override suspend fun query(deviceToken: String): DeviceCheckQuery {
+                    queries++
+                    return DeviceCheckQuery.Found(DeviceCheckState(appleBit, false, null))
+                }
+
+                override suspend fun update(deviceToken: String, bit0: Boolean, bit1: Boolean) {
+                    appleBit = bit0
+                }
+            },
+            creditGranter = object : TrialCreditGranter {
+                override suspend fun grant(accountId: UUID) {
+                    grantedAccounts += accountId
+                }
+
+                override suspend fun wasGranted(accountId: UUID): Boolean =
+                    accountId in grantedAccounts
+            },
+            policy = IntegrityPolicy.ENFORCE,
+        )
+
+        service.claimAndGrant(
+            accountId,
+            Base64.getEncoder().encodeToString(ByteArray(32) { 6 }),
+        ) shouldBe SignupTrialClaimResult.GRANTED
+        val queriesAfterGrant = queries
+
+        val repeated = service.claimAndGrant(
+            accountId,
+            Base64.getEncoder().encodeToString(ByteArray(32) { 7 }),
+        )
+
+        repeated shouldBe SignupTrialClaimResult.ALREADY_GRANTED
+        repeated.shouldRestrictAccount.shouldBeFalse()
+        queries shouldBe queriesAfterGrant
+        grantedAccounts shouldBe setOf(accountId)
+    }
+
+    test("only an ineligible trial result restricts an account") {
+        SignupTrialClaimResult.GRANTED.shouldRestrictAccount.shouldBeFalse()
+        SignupTrialClaimResult.ALREADY_GRANTED.shouldRestrictAccount.shouldBeFalse()
+        SignupTrialClaimResult.SKIPPED.shouldRestrictAccount.shouldBeFalse()
+        SignupTrialClaimResult.INELIGIBLE.shouldRestrictAccount.shouldBeTrue()
+    }
+
     test("monitor skips a trial while enforce fails closed on Apple outage") {
         val unavailable = object : AppleDeviceCheckClient {
             override suspend fun query(deviceToken: String): DeviceCheckQuery =
@@ -130,7 +185,7 @@ class DeviceCheckTest : FunSpec({
             unavailable,
             TrialCreditGranter { error("must not grant") },
             IntegrityPolicy.MONITOR,
-        ).claimAndGrant(accountId, token).shouldBeFalse()
+        ).claimAndGrant(accountId, token) shouldBe SignupTrialClaimResult.SKIPPED
 
         shouldThrow<ExternalServiceUnavailableException> {
             DeviceCheckTrialService(
@@ -176,7 +231,8 @@ class DeviceCheckTest : FunSpec({
             }.awaitAll()
         }
 
-        results.count { it } shouldBe 1
+        results.count { it == SignupTrialClaimResult.GRANTED } shouldBe 1
+        results.count { it == SignupTrialClaimResult.INELIGIBLE } shouldBe 1
         grants shouldBe 1
     }