diff --git a/cwd-admin/src/api/admin.ts b/cwd-admin/src/api/admin.ts
index b20cd63..42b4e85 100644
--- a/cwd-admin/src/api/admin.ts
+++ b/cwd-admin/src/api/admin.ts
@@ -23,6 +23,7 @@ export type CommentItem = {
 	likes?: number;
 	ua?: string | null;
 	isAdmin?: boolean;
+	siteId?: string;
 };
 
 export type CommentListResponse = {
@@ -115,8 +116,8 @@ export type VisitPagesResponse = {
 	itemsByLatest?: VisitPageItem[];
 };
 
-export type DomainListResponse = {
-	domains: string[];
+export type SiteListResponse = {
+	sites: string[];
 };
 
 export type LikeStatsItem = {
@@ -153,11 +154,11 @@ export function logoutAdmin(): void {
 	localStorage.removeItem('cwd_admin_token');
 }
 
-export function fetchComments(page: number, domain?: string): Promise<CommentListResponse> {
+export function fetchComments(page: number, siteId?: string): Promise<CommentListResponse> {
 	const searchParams = new URLSearchParams();
 	searchParams.set('page', String(page));
-	if (domain) {
-		searchParams.set('domain', domain);
+	if (siteId && siteId !== 'default') {
+		searchParams.set('siteId', siteId);
 	}
 	return get<CommentListResponse>(`/admin/comments/list?${searchParams.toString()}`);
 }
@@ -262,8 +263,13 @@ export function blockEmail(email: string): Promise<{ message: string }> {
 	return post<{ message: string }>('/admin/comments/block-email', { email });
 }
 
-export function exportComments(): Promise<any[]> {
-	return get<any[]>('/admin/comments/export');
+export function exportComments(siteId?: string): Promise<any[]> {
+	const searchParams = new URLSearchParams();
+	if (siteId && siteId !== 'default') {
+		searchParams.set('siteId', siteId);
+	}
+	const query = searchParams.toString();
+	return get<any[]>(query ? `/admin/comments/export?${query}` : '/admin/comments/export');
 }
 
 export function importComments(data: any[]): Promise<{ message: string }> {
@@ -278,8 +284,13 @@ export function importConfig(data: any[]): Promise<{ message: string }> {
 	return post<{ message: string }>('/admin/import/config', data);
 }
 
-export function exportStats(): Promise<any> {
-	return get<any>('/admin/export/stats');
+export function exportStats(siteId?: string): Promise<any> {
+	const searchParams = new URLSearchParams();
+	if (siteId && siteId !== 'default') {
+		searchParams.set('siteId', siteId);
+	}
+	const query = searchParams.toString();
+	return get<any>(query ? `/admin/export/stats?${query}` : '/admin/export/stats');
 }
 
 export function importStats(data: any): Promise<{ message: string }> {
@@ -294,30 +305,30 @@ export function importBackup(data: any): Promise<{ message: string }> {
 	return post<{ message: string }>('/admin/import/backup', data);
 }
 
-export function fetchCommentStats(domain?: string): Promise<CommentStatsResponse> {
+export function fetchCommentStats(siteId?: string): Promise<CommentStatsResponse> {
 	const searchParams = new URLSearchParams();
-	if (domain) {
-		searchParams.set('domain', domain);
+	if (siteId && siteId !== 'default') {
+		searchParams.set('siteId', siteId);
 	}
 	const query = searchParams.toString();
 	const url = query ? `/admin/stats/comments?${query}` : '/admin/stats/comments';
 	return get<CommentStatsResponse>(url);
 }
 
-export function fetchVisitOverview(domain?: string): Promise<VisitOverviewResponse> {
+export function fetchVisitOverview(siteId?: string): Promise<VisitOverviewResponse> {
 	const searchParams = new URLSearchParams();
-	if (domain) {
-		searchParams.set('domain', domain);
+	if (siteId && siteId !== 'default') {
+		searchParams.set('siteId', siteId);
 	}
 	const query = searchParams.toString();
 	const url = query ? `/admin/analytics/overview?${query}` : '/admin/analytics/overview';
 	return get<VisitOverviewResponse>(url);
 }
 
-export function fetchVisitPages(domain?: string, order?: 'pv' | 'latest'): Promise<VisitPagesResponse> {
+export function fetchVisitPages(siteId?: string, order?: 'pv' | 'latest'): Promise<VisitPagesResponse> {
 	const searchParams = new URLSearchParams();
-	if (domain) {
-		searchParams.set('domain', domain);
+	if (siteId && siteId !== 'default') {
+		searchParams.set('siteId', siteId);
 	}
 	if (order) {
 		searchParams.set('order', order);
@@ -327,8 +338,8 @@ export function fetchVisitPages(domain?: string, order?: 'pv' | 'latest'): Promi
 	return get<VisitPagesResponse>(url);
 }
 
-export function fetchDomainList(): Promise<DomainListResponse> {
-	return get<DomainListResponse>('/admin/stats/domains');
+export function fetchSiteList(): Promise<SiteListResponse> {
+	return get<SiteListResponse>('/admin/stats/sites');
 }
 
 export function fetchLikeStats(): Promise<LikeStatsResponse> {
diff --git a/cwd-admin/src/composables/useSite.ts b/cwd-admin/src/composables/useSite.ts
new file mode 100644
index 0000000..1f6ce99
--- /dev/null
+++ b/cwd-admin/src/composables/useSite.ts
@@ -0,0 +1,17 @@
+import { ref, watch } from 'vue';
+
+const currentSiteId = ref(localStorage.getItem('cwd_admin_site_id') || 'default');
+
+watch(currentSiteId, (val) => {
+  if (val) {
+    localStorage.setItem('cwd_admin_site_id', val);
+  } else {
+    localStorage.removeItem('cwd_admin_site_id');
+  }
+});
+
+export function useSite() {
+  return {
+    currentSiteId
+  };
+}
diff --git a/cwd-admin/src/views/AnalyticsVisitView/index.vue b/cwd-admin/src/views/AnalyticsVisitView/index.vue
index 6cb5504..5fe228f 100644
--- a/cwd-admin/src/views/AnalyticsVisitView/index.vue
+++ b/cwd-admin/src/views/AnalyticsVisitView/index.vue
@@ -224,6 +224,7 @@ import {
   fetchLikeStats,
   type LikeStatsItem,
 } from "../../api/admin";
+import { useSite } from "../../composables/useSite";
 
 const loading = ref(false);
 const listLoading = ref(false);
@@ -240,6 +241,8 @@ const overview = ref<VisitOverviewResponse>({
   last30Days: [],
 });
 
+const { currentSiteId } = useSite();
+
 function calculateChange(current: number, previous: number) {
   if (previous === 0) {
     return current > 0 ? 100 : 0;
@@ -271,8 +274,6 @@ const visitTab = ref<"pv" | "latest">("pv");
 const visitTabStorageKey = "cwd-analytics-visit-tab";
 const chartRangeStorageKey = "cwd-analytics-visit-chart-range";
 
-const injectedDomainFilter = inject<Ref<string> | null>("domainFilter", null);
-const domainFilter = injectedDomainFilter ?? ref("");
 const last30Days = ref<{ date: string; total: number }[]>([]);
 const likeStatsItems = ref<LikeStatsItem[]>([]);
 const chartRange = ref<"7" | "30">("7");
@@ -424,7 +425,7 @@ async function loadData() {
   listLoading.value = true;
   error.value = "";
   try {
-    const domain = domainFilter.value || undefined;
+    const domain = currentSiteId.value;
     const order = getVisitOrderParam();
     const [overviewRes, pagesRes, likeStatsRes] = await Promise.all([
       fetchVisitOverview(domain),
@@ -589,7 +590,7 @@ onBeforeUnmount(() => {
   }
 });
 
-watch(domainFilter, () => {
+watch(currentSiteId, () => {
   loadData();
 });
 </script>
diff --git a/cwd-admin/src/views/CommentsView/index.vue b/cwd-admin/src/views/CommentsView/index.vue
index 19ebb78..c215d41 100644
--- a/cwd-admin/src/views/CommentsView/index.vue
+++ b/cwd-admin/src/views/CommentsView/index.vue
@@ -240,9 +240,9 @@ import {
   updateComment,
   blockIp,
   blockEmail,
-  fetchDomainList,
 } from "../../api/admin";
 import ModalEdit from "./components/ModalEdit.vue";
+import { useSite } from "../../composables/useSite";
 
 const route = useRoute();
 const router = useRouter();
@@ -252,8 +252,7 @@ const pagination = ref<{ page: number; total: number }>({ page: 1, total: 1 });
 const loading = ref(false);
 const error = ref("");
 const statusFilter = ref("");
-const injectedDomainFilter = inject<Ref<string> | null>("domainFilter", null);
-const domainFilter = injectedDomainFilter ?? ref("");
+const { currentSiteId } = useSite();
 const jumpPageInput = ref("");
 const editVisible = ref(false);
 const editSaving = ref(false);
@@ -325,7 +324,7 @@ async function loadComments(page?: number) {
   loading.value = true;
   error.value = "";
   try {
-    const res = await fetchComments(targetPage, domainFilter.value || undefined);
+    const res = await fetchComments(targetPage, currentSiteId.value);
     comments.value = res.data;
     pagination.value = { page: res.pagination.page, total: res.pagination.total };
   } catch (e: any) {
@@ -342,11 +341,9 @@ function updateRoutePage(page: number) {
   } else {
     query.p = String(page);
   }
-  if (domainFilter.value) {
-    query.domain = domainFilter.value;
-  } else {
-    delete query.domain;
-  }
+  // Removed domain from query as it's now global state
+  delete query.domain;
+  
   router.push({ query });
 }
 
@@ -530,15 +527,11 @@ onMounted(() => {
       initialPage = Math.floor(value);
     }
   }
-  const d = route.query.domain;
-  if (typeof d === "string" && d.trim()) {
-    domainFilter.value = d.trim();
-  }
 
   loadComments(initialPage);
 });
 
-watch(domainFilter, () => {
+watch(currentSiteId, () => {
   updateRoutePage(1);
   loadComments(1);
 });
diff --git a/cwd-admin/src/views/DataView/index.vue b/cwd-admin/src/views/DataView/index.vue
index 79027e4..54835be 100644
--- a/cwd-admin/src/views/DataView/index.vue
+++ b/cwd-admin/src/views/DataView/index.vue
@@ -121,6 +121,7 @@ import {
   exportStats, importStats,
   exportBackup, importBackup
 } from "../../api/admin";
+import { useSite } from "../../composables/useSite";
 
 const exporting = ref(false);
 const importing = ref(false);
@@ -130,6 +131,7 @@ const toastMessage = ref("");
 const toastType = ref<"success" | "error">("success");
 const toastVisible = ref(false);
 const importLogs = ref<string[]>([]);
+const { currentSiteId } = useSite();
 
 // 当前导入模式: comments | config | stats | backup
 const currentImportMode = ref<string>('comments');
@@ -178,9 +180,9 @@ async function executeExport(apiFunc: () => Promise<any>, fileNamePrefix: string
 }
 
 // 导出处理
-const handleExportComments = () => executeExport(exportComments, 'comments-export');
+const handleExportComments = () => executeExport(() => exportComments(currentSiteId.value), 'comments-export');
 const handleExportConfig = () => executeExport(exportConfig, 'cwd-config');
-const handleExportStats = () => executeExport(exportStats, 'cwd-stats');
+const handleExportStats = () => executeExport(() => exportStats(currentSiteId.value), 'cwd-stats');
 const handleExportBackup = () => executeExport(exportBackup, 'cwd-full-backup');
 
 // 触发文件选择
diff --git a/cwd-admin/src/views/LayoutView/index.vue b/cwd-admin/src/views/LayoutView/index.vue
index ceb7292..71a3ce0 100644
--- a/cwd-admin/src/views/LayoutView/index.vue
+++ b/cwd-admin/src/views/LayoutView/index.vue
@@ -12,10 +12,10 @@
       <div class="layout-title">{{ layoutTitle }}</div>
       <div class="layout-actions-wrapper">
         <div class="layout-domain-filter layout-domain-filter-header">
-          <select v-model="domainFilter" class="layout-domain-select">
-            <option value="">全部域名</option>
-            <option v-for="item in domainOptions" :key="item" :value="item">
-              {{ item }}
+          <select v-model="currentSiteId" class="layout-domain-select">
+            <option value="default">所有站点</option>
+            <option v-for="item in siteOptions" :key="item.value" :value="item.value">
+              {{ item.label }}
             </option>
           </select>
         </div>
@@ -70,10 +70,10 @@
         :class="{ 'layout-sider-mobile-open': isMobileSiderOpen }"
       >
         <div class="layout-sider-domain-filter">
-          <select v-model="domainFilter" class="layout-domain-select">
-            <option value="">全部域名</option>
-            <option v-for="item in domainOptions" :key="item" :value="item">
-              {{ item }}
+          <select v-model="currentSiteId" class="layout-domain-select">
+            <option value="default">所有站点</option>
+            <option v-for="item in siteOptions" :key="item.value" :value="item.value">
+              {{ item.label }}
             </option>
           </select>
         </div>
@@ -171,19 +171,20 @@
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted, watch, provide, computed } from "vue";
+import { ref, onMounted, provide, computed } from "vue";
 import { useRouter, useRoute } from "vue-router";
-import { logoutAdmin, fetchDomainList, fetchAdminDisplaySettings, fetchFeatureSettings } from "../../api/admin";
+import { logoutAdmin, fetchSiteList, fetchAdminDisplaySettings } from "../../api/admin";
 import { useTheme } from "../../composables/useTheme";
+import { useSite } from "../../composables/useSite";
 import packageJson from "../../../package.json";
 
-const DOMAIN_STORAGE_KEY = "cwd_admin_domain_filter";
 const API_BASE_URL_KEY = "cwd_admin_api_base_url";
 const SITE_TITLE_KEY = "cwd_admin_site_title";
 
 const router = useRouter();
 const route = useRoute();
 const { theme, setTheme } = useTheme();
+const { currentSiteId } = useSite();
 
 const isMobileSiderOpen = ref(false);
 const isActionsOpen = ref(false);
@@ -206,34 +207,20 @@ function cycleTheme() {
   else setTheme("system");
 }
 
-const storedDomain =
-  typeof window !== "undefined"
-    ? window.localStorage.getItem(DOMAIN_STORAGE_KEY) || ""
-    : "";
-const domainFilter = ref(storedDomain);
-const domainOptions = ref<string[]>([]);
+type SiteOption = { label: string; value: string };
+const siteOptions = ref<SiteOption[]>([]);
 
-async function loadDomains() {
+async function loadSites() {
   try {
-    const [domainRes, settingsRes] = await Promise.all([
-      fetchDomainList(),
-      fetchFeatureSettings().catch(() => ({ visibleDomains: undefined }))
-    ]);
+    const res = await fetchSiteList();
+    const sites = Array.isArray(res.sites) ? res.sites : [];
     
-    let domains = Array.isArray(domainRes.domains) ? domainRes.domains : [];
-    
-    // 如果配置了显示域名，则仅显示配置的域名
-    if (settingsRes.visibleDomains && Array.isArray(settingsRes.visibleDomains) && settingsRes.visibleDomains.length > 0) {
-        domains = settingsRes.visibleDomains;
-    }
-
-    const set = new Set(domains);
-    if (domainFilter.value && !set.has(domainFilter.value)) {
-      set.add(domainFilter.value);
-    }
-    domainOptions.value = Array.from(set);
+    siteOptions.value = sites.map(s => ({
+        label: s === '' ? '默认站点 (Default)' : s,
+        value: s
+    }));
   } catch {
-    domainOptions.value = [];
+    siteOptions.value = [];
   }
 }
 
@@ -287,21 +274,14 @@ async function loadDisplaySettings() {
   }
 }
 
-provide("domainFilter", domainFilter);
 provide("updateSiteTitle", updateTitle);
 
 onMounted(() => {
-  loadDomains();
+  loadSites();
   loadVersion();
   loadDisplaySettings();
 });
 
-watch(domainFilter, (value) => {
-  if (typeof window !== "undefined") {
-    window.localStorage.setItem(DOMAIN_STORAGE_KEY, value || "");
-  }
-});
-
 function isRouteActive(name: string) {
   return route.name === name;
 }
diff --git a/cwd-admin/src/views/SettingsView/components/DomainSettings.vue b/cwd-admin/src/views/SettingsView/components/SiteManager.vue
similarity index 95%
rename from cwd-admin/src/views/SettingsView/components/DomainSettings.vue
rename to cwd-admin/src/views/SettingsView/components/SiteManager.vue
index aa6a9fe..94d7b39 100644
--- a/cwd-admin/src/views/SettingsView/components/DomainSettings.vue
+++ b/cwd-admin/src/views/SettingsView/components/SiteManager.vue
@@ -1,14 +1,14 @@
 <template>
   <div class="domain-settings">
     <div class="domain-settings-desc">
-      配置后台可见的域名。左侧为后台下拉框中显示的域名，右侧为数据库中发现的所有域名。支持拖拽或点击按钮移动。
+      配置后台可见的站点。左侧为后台下拉框中显示的站点，右侧为数据库中发现的所有站点。支持拖拽或点击按钮移动。
     </div>
 
     <div class="domain-transfer">
       <!-- Visible Domains (Left) -->
       <div class="transfer-panel">
         <div class="transfer-header">
-          后台显示域名 ({{ visibleList.length }})
+          后台显示站点 ({{ visibleList.length }})
         </div>
         <div 
           class="transfer-body"
@@ -19,7 +19,7 @@
             v-if="visibleList.length === 0" 
             class="transfer-empty"
           >
-            无域名 (默认显示全部)
+            无站点 (默认显示全部)
           </div>
           <div
             v-for="domain in visibleList"
@@ -50,7 +50,7 @@
       <!-- Hidden/All Domains (Right) -->
       <div class="transfer-panel">
         <div class="transfer-header">
-          其他域名 ({{ hiddenList.length }})
+          其他站点 ({{ hiddenList.length }})
         </div>
         <div 
           class="transfer-body"
@@ -61,7 +61,7 @@
             v-if="hiddenList.length === 0" 
             class="transfer-empty"
           >
-            无更多域名
+            无更多站点
           </div>
           <div
             v-for="domain in hiddenList"
@@ -338,4 +338,4 @@ onMounted(() => {
     cursor: not-allowed;
   }
 }
-</style>
\ No newline at end of file
+</style>
diff --git a/cwd-admin/src/views/SettingsView/index.vue b/cwd-admin/src/views/SettingsView/index.vue
index e45cdec..3b02458 100644
--- a/cwd-admin/src/views/SettingsView/index.vue
+++ b/cwd-admin/src/views/SettingsView/index.vue
@@ -38,10 +38,10 @@
         <button
           type="button"
           class="settings-tab"
-          :class="{ 'settings-tab-active': activeTab === 'domain' }"
-          @click="activeTab = 'domain'"
+          :class="{ 'settings-tab-active': activeTab === 'site' }"
+          @click="activeTab = 'site'"
         >
-          域名管理
+          站点管理
         </button>
         <button
           type="button"
@@ -238,13 +238,13 @@
               </div>
             </div>
           </template>
-          <template v-else-if="activeTab === 'domain'">
+          <template v-else-if="activeTab === 'site'">
             <div class="card">
               <div class="card-header">
-                <div class="card-title">域名选择管理</div>
+                <div class="card-title">站点列表管理</div>
               </div>
               <div class="card-body">
-                <DomainSettings />
+                <SiteManager />
               </div>
             </div>
           </template>
@@ -497,7 +497,7 @@ import {
   sendTelegramTestMessage,
 } from "../../api/admin";
 
-import DomainSettings from "./components/DomainSettings.vue";
+import SiteManager from "./components/SiteManager.vue";
 import TagInput from "../../components/TagInput.vue";
 
 const DEFAULT_REPLY_TEMPLATE = `<div style="background-color:#f4f4f5;padding:24px 0;">
@@ -607,14 +607,14 @@ type TabKey =
   | "display"
   | "emailNotify"
   | "telegramNotify"
-  | "domain";
+  | "site";
 const validTabs: TabKey[] = [
   "comment",
   "feature",
   "display",
   "emailNotify",
   "telegramNotify",
-  "domain",
+  "site",
 ];
 
 const activeTab = ref<TabKey>(
@@ -661,11 +661,12 @@ function loadCardsExpanded() {
         feature: parsed.feature ?? false,
         email: parsed.email ?? false,
         telegram: parsed.telegram ?? false,
+        site: parsed.site ?? false,
       };
     }
   } catch {
   }
-  return { comment: true, display: false, feature: false, email: false, telegram: false };
+  return { comment: true, display: false, feature: false, email: false, telegram: false, site: false };
 }
 
 const cardsExpanded = ref(loadCardsExpanded());
@@ -822,7 +823,7 @@ async function testEmail() {
     message.value = "请先在上方“评论显示配置”中设置管理员邮箱";
     messageType.value = "error";
     return;
-  }
+    }
   if (!smtpUser.value || !smtpPass.value) {
     message.value = "请先填写 SMTP 账号和密码";
     messageType.value = "error";
diff --git a/cwd-admin/src/views/StatsView/index.vue b/cwd-admin/src/views/StatsView/index.vue
index caa9a5f..3e5a99d 100644
--- a/cwd-admin/src/views/StatsView/index.vue
+++ b/cwd-admin/src/views/StatsView/index.vue
@@ -115,6 +115,7 @@ import { onMounted, onBeforeUnmount, ref, nextTick, watch, inject } from "vue";
 import type { Ref } from "vue";
 import * as echarts from "echarts";
 import { fetchCommentStats } from "../../api/admin";
+import { useSite } from "../../composables/useSite";
 
 type DomainStat = {
   domain: string;
@@ -137,8 +138,7 @@ const last7Days = ref<{ date: string; total: number }[]>([]);
 const chartRange = ref<"7" | "30">("7");
 const chartRangeStorageKey = "cwd-stats-chart-range";
 
-const injectedDomainFilter = inject<Ref<string> | null>("domainFilter", null);
-const domainFilter = injectedDomainFilter ?? ref("");
+const { currentSiteId } = useSite();
 
 const toastMessage = ref("");
 const toastType = ref<"success" | "error">("success");
@@ -185,7 +185,7 @@ async function loadStats() {
   statsLoading.value = true;
   statsError.value = "";
   try {
-    const res = await fetchCommentStats(domainFilter.value || undefined);
+    const res = await fetchCommentStats(currentSiteId.value);
     statsSummary.value = {
       total: res.summary.total,
       approved: res.summary.approved,
@@ -330,7 +330,7 @@ onMounted(() => {
   window.addEventListener("resize", handleResize);
 });
 
-watch(domainFilter, () => {
+watch(currentSiteId, () => {
   loadStats();
 });
 
diff --git a/cwd-api/package.json b/cwd-api/package.json
index 8174cc5..07ec53a 100644
--- a/cwd-api/package.json
+++ b/cwd-api/package.json
@@ -14,7 +14,7 @@
 		"@types/ua-parser-js": "^0.7.39",
 		"typescript": "^5.5.2",
 		"vitest": "~3.2.0",
-		"wrangler": "^4.58.0"
+		"wrangler": "^4.63.0"
 	},
 	"dependencies": {
 		"hono": "^4.11.3",
diff --git a/cwd-api/src/api/admin/exportComments.ts b/cwd-api/src/api/admin/exportComments.ts
index 0d3b30a..0b1fcec 100644
--- a/cwd-api/src/api/admin/exportComments.ts
+++ b/cwd-api/src/api/admin/exportComments.ts
@@ -3,9 +3,18 @@ import { Bindings } from '../../bindings';
 
 export const exportComments = async (c: Context<{ Bindings: Bindings }>) => {
 	try {
-		const { results } = await c.env.CWD_DB.prepare(
-			'SELECT * FROM Comment ORDER BY priority DESC, created DESC'
-		).all();
+		const siteId = c.req.query('siteId');
+		let query = 'SELECT * FROM Comment';
+		const params: any[] = [];
+
+		if (siteId) {
+			query += ' WHERE site_id = ?';
+			params.push(siteId);
+		}
+
+		query += ' ORDER BY priority DESC, created DESC';
+
+		const { results } = await c.env.CWD_DB.prepare(query).bind(...params).all();
 
 		return c.json(results);
 	} catch (e: any) {
diff --git a/cwd-api/src/api/admin/exportStats.ts b/cwd-api/src/api/admin/exportStats.ts
index e5d30ca..37bf577 100644
--- a/cwd-api/src/api/admin/exportStats.ts
+++ b/cwd-api/src/api/admin/exportStats.ts
@@ -1,26 +1,24 @@
 import { Context } from 'hono';
 import { Bindings } from '../../bindings';
 
-async function ensureStatsTables(env: Bindings) {
-	await env.CWD_DB.prepare(
-		'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-	).run();
+export const getStatsData = async (env: Bindings, siteId?: string) => {
+	// Tables are ensured by dbMigration on startup
 
-	await env.CWD_DB.prepare(
-		'CREATE TABLE IF NOT EXISTS page_visit_daily (id INTEGER PRIMARY KEY AUTOINCREMENT, date TEXT NOT NULL, domain TEXT, count INTEGER NOT NULL DEFAULT 0, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-	).run();
+	let statsQuery = 'SELECT * FROM page_stats';
+	let dailyQuery = 'SELECT * FROM page_visit_daily';
+	let likesQuery = 'SELECT * FROM Likes';
+	const params: any[] = [];
 
-	await env.CWD_DB.prepare(
-		'CREATE TABLE IF NOT EXISTS Likes (id INTEGER PRIMARY KEY AUTOINCREMENT, page_slug TEXT NOT NULL, user_id TEXT NOT NULL, created_at INTEGER NOT NULL, UNIQUE(page_slug, user_id))'
-	).run();
-}
+	if (siteId) {
+		statsQuery += ' WHERE site_id = ?';
+		dailyQuery += ' WHERE site_id = ?';
+		likesQuery += ' WHERE site_id = ?';
+		params.push(siteId);
+	}
 
-export const getStatsData = async (env: Bindings) => {
-	await ensureStatsTables(env);
-
-	const { results: pageStats } = await env.CWD_DB.prepare('SELECT * FROM page_stats').all();
-	const { results: dailyVisits } = await env.CWD_DB.prepare('SELECT * FROM page_visit_daily').all();
-	const { results: likes } = await env.CWD_DB.prepare('SELECT * FROM Likes').all();
+	const { results: pageStats } = await env.CWD_DB.prepare(statsQuery).bind(...params).all();
+	const { results: dailyVisits } = await env.CWD_DB.prepare(dailyQuery).bind(...params).all();
+	const { results: likes } = await env.CWD_DB.prepare(likesQuery).bind(...params).all();
 
 	return {
 		page_stats: pageStats,
@@ -31,7 +29,8 @@ export const getStatsData = async (env: Bindings) => {
 
 export const exportStats = async (c: Context<{ Bindings: Bindings }>) => {
 	try {
-		const data = await getStatsData(c.env);
+		const siteId = c.req.query('siteId');
+		const data = await getStatsData(c.env, siteId);
 		return c.json(data);
 	} catch (e: any) {
 		return c.json({ message: e.message || '导出统计数据失败' }, 500);
diff --git a/cwd-api/src/api/admin/getDomains.ts b/cwd-api/src/api/admin/getDomains.ts
index 1f5036f..4248ade 100644
--- a/cwd-api/src/api/admin/getDomains.ts
+++ b/cwd-api/src/api/admin/getDomains.ts
@@ -1,74 +1,53 @@
 import type { Context } from 'hono';
 import type { Bindings } from '../../bindings';
 
-function extractDomain(source: string | null | undefined): string | null {
-	if (!source) {
-		return null;
-	}
-	const value = source.trim();
-	if (!value) {
-		return null;
-	}
-	if (!/^https?:\/\//i.test(value)) {
-		return null;
-	}
+export const getSites = async (c: Context<{ Bindings: Bindings }>) => {
 	try {
-		const url = new URL(value);
-		return url.hostname.toLowerCase();
-	} catch {
-		return null;
-	}
-}
-
-export const getDomains = async (c: Context<{ Bindings: Bindings }>) => {
-	try {
-		const domains = new Set<string>();
+		const sites = new Set<string>();
 
+		// 1. Get sites from Comment
 		const { results: commentRows } = await c.env.CWD_DB.prepare(
-			'SELECT post_slug, post_url FROM Comment'
-		).all<{
-			post_slug: string;
-			post_url: string | null;
-		}>();
+			'SELECT DISTINCT site_id FROM Comment'
+		).all<{ site_id: string }>();
 
 		for (const row of commentRows) {
-			const domain =
-				extractDomain(row.post_url) || extractDomain(row.post_slug);
-			if (domain) {
-				domains.add(domain);
+			if (row.site_id !== undefined && row.site_id !== null) {
+				sites.add(row.site_id);
 			}
 		}
 
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
-
+		// 2. Get sites from page_stats
 		const { results: pageRows } = await c.env.CWD_DB.prepare(
-			'SELECT post_slug, post_url FROM page_stats'
-		).all<{
-			post_slug: string;
-			post_url: string | null;
-		}>();
+			'SELECT DISTINCT site_id FROM page_stats'
+		).all<{ site_id: string }>();
 
 		for (const row of pageRows) {
-			const domain =
-				extractDomain(row.post_url) || extractDomain(row.post_slug);
-			if (domain) {
-				domains.add(domain);
+			if (row.site_id !== undefined && row.site_id !== null) {
+				sites.add(row.site_id);
 			}
 		}
 
-		const list = Array.from(domains);
+        // 3. Get sites from page_visit_daily
+        const { results: dailyRows } = await c.env.CWD_DB.prepare(
+            'SELECT DISTINCT site_id FROM page_visit_daily'
+        ).all<{ site_id: string }>();
+
+        for (const row of dailyRows) {
+            if (row.site_id !== undefined && row.site_id !== null) {
+                sites.add(row.site_id);
+            }
+        }
+
+		const list = Array.from(sites);
 		list.sort();
 
 		return c.json({
-			domains: list
+			sites: list
 		});
 	} catch (e: any) {
 		return c.json(
-			{ message: e.message || '获取域名列表失败' },
+			{ message: e.message || '获取站点列表失败' },
 			500
 		);
 	}
 };
-
diff --git a/cwd-api/src/api/admin/getStats.ts b/cwd-api/src/api/admin/getStats.ts
index 9153b3f..79120b1 100644
--- a/cwd-api/src/api/admin/getStats.ts
+++ b/cwd-api/src/api/admin/getStats.ts
@@ -33,26 +33,25 @@ function extractDomain(source: string | null | undefined): string | null {
 
 export const getStats = async (c: Context<{ Bindings: Bindings }>) => {
 	try {
-		const rawDomain = c.req.query('domain') || '';
-		const domainFilter = rawDomain.trim().toLowerCase();
+		const rawSiteId = c.req.query('siteId');
+		const siteId = rawSiteId && rawSiteId !== 'default' ? rawSiteId : null;
 
-		const { results } = await c.env.CWD_DB.prepare(
-			'SELECT created, post_slug, post_url, status FROM Comment'
-		).all<{
+		let sql = 'SELECT created, post_slug, post_url, status FROM Comment';
+		const params: any[] = [];
+
+		if (siteId) {
+			sql += ' WHERE site_id = ?';
+			params.push(siteId);
+		}
+
+		const { results } = await c.env.CWD_DB.prepare(sql).bind(...params).all<{
 			created: number;
 			post_slug: string;
 			post_url: string | null;
 			status: string;
 		}>();
 
-		const summaryAll: StatusCounts = {
-			total: 0,
-			approved: 0,
-			pending: 0,
-			rejected: 0
-		};
-
-		const summaryFiltered: StatusCounts = {
+		const summary: StatusCounts = {
 			total: 0,
 			approved: 0,
 			pending: 0,
@@ -60,9 +59,7 @@ export const getStats = async (c: Context<{ Bindings: Bindings }>) => {
 		};
 
 		const domainMap = new Map<string, StatusCounts>();
-
-		const dailyMapAll = new Map<string, number>();
-		const dailyMapFiltered = new Map<string, number>();
+		const dailyMap = new Map<string, number>();
 
 		const now = Date.now();
 		const thirtyDaysAgo = now - 29 * 24 * 60 * 60 * 1000;
@@ -90,26 +87,13 @@ export const getStats = async (c: Context<{ Bindings: Bindings }>) => {
 				counts.rejected += 1;
 			}
 
-			summaryAll.total += 1;
+			summary.total += 1;
 			if (row.status === 'approved') {
-				summaryAll.approved += 1;
+				summary.approved += 1;
 			} else if (row.status === 'pending') {
-				summaryAll.pending += 1;
+				summary.pending += 1;
 			} else if (row.status === 'rejected') {
-				summaryAll.rejected += 1;
-			}
-
-			const matchesFilter = domainFilter && domain === domainFilter;
-
-			if (matchesFilter) {
-				summaryFiltered.total += 1;
-				if (row.status === 'approved') {
-					summaryFiltered.approved += 1;
-				} else if (row.status === 'pending') {
-					summaryFiltered.pending += 1;
-				} else if (row.status === 'rejected') {
-					summaryFiltered.rejected += 1;
-				}
+				summary.rejected += 1;
 			}
 
 			if (row.created >= thirtyDaysAgo) {
@@ -119,14 +103,7 @@ export const getStats = async (c: Context<{ Bindings: Bindings }>) => {
 				const day = String(d.getUTCDate()).padStart(2, '0');
 				const key = `${year}-${month}-${day}`;
 
-				dailyMapAll.set(key, (dailyMapAll.get(key) || 0) + 1);
-
-				if (matchesFilter) {
-					dailyMapFiltered.set(
-						key,
-						(dailyMapFiltered.get(key) || 0) + 1
-					);
-				}
+				dailyMap.set(key, (dailyMap.get(key) || 0) + 1);
 			}
 		}
 
@@ -140,8 +117,6 @@ export const getStats = async (c: Context<{ Bindings: Bindings }>) => {
 			}))
 			.sort((a, b) => b.total - a.total);
 
-		const dailyMap = domainFilter ? dailyMapFiltered : dailyMapAll;
-
 		const last7Days: { date: string; total: number }[] = [];
 		for (let i = 29; i >= 0; i--) {
 			const d = new Date(now - i * 24 * 60 * 60 * 1000);
@@ -155,8 +130,6 @@ export const getStats = async (c: Context<{ Bindings: Bindings }>) => {
 			});
 		}
 
-		const summary = domainFilter ? summaryFiltered : summaryAll;
-
 		return c.json({
 			summary,
 			domains,
diff --git a/cwd-api/src/api/admin/likeStats.ts b/cwd-api/src/api/admin/likeStats.ts
index c34c613..c1c91d4 100644
--- a/cwd-api/src/api/admin/likeStats.ts
+++ b/cwd-api/src/api/admin/likeStats.ts
@@ -10,17 +10,24 @@ type LikeStatsItem = {
 
 export const getLikeStats = async (c: Context<{ Bindings: Bindings }>) => {
 	try {
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS Likes (id INTEGER PRIMARY KEY AUTOINCREMENT, page_slug TEXT NOT NULL, user_id TEXT NOT NULL, created_at INTEGER NOT NULL, UNIQUE(page_slug, user_id))'
-		).run();
+		const siteId = c.req.query('siteId');
 
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
+		let query = `
+			SELECT l.page_slug, COALESCE(p.post_title, NULL) AS page_title, COALESCE(p.post_url, NULL) AS page_url, COUNT(*) AS likes 
+			FROM Likes l 
+			LEFT JOIN page_stats p ON p.post_slug = l.page_slug AND p.site_id = l.site_id
+		`;
+		
+		const params: any[] = [];
 
-		const { results } = await c.env.CWD_DB.prepare(
-			'SELECT l.page_slug, COALESCE(p.post_title, NULL) AS page_title, COALESCE(p.post_url, NULL) AS page_url, COUNT(*) AS likes FROM Likes l LEFT JOIN page_stats p ON p.post_slug = l.page_slug GROUP BY l.page_slug, p.post_title, p.post_url ORDER BY likes DESC LIMIT 50'
-		).all<LikeStatsItem>();
+		if (siteId) {
+			query += ' WHERE l.site_id = ?';
+			params.push(siteId);
+		}
+
+		query += ' GROUP BY l.page_slug, l.site_id, p.post_title, p.post_url ORDER BY likes DESC LIMIT 50';
+
+		const { results } = await c.env.CWD_DB.prepare(query).bind(...params).all<LikeStatsItem>();
 
 		const items = results.map((row) => ({
 			pageSlug: row.page_slug,
diff --git a/cwd-api/src/api/admin/listComments.ts b/cwd-api/src/api/admin/listComments.ts
index 8b355a4..20e372b 100644
--- a/cwd-api/src/api/admin/listComments.ts
+++ b/cwd-api/src/api/admin/listComments.ts
@@ -10,25 +10,14 @@ export const listComments = async (c: Context<{ Bindings: Bindings }>) => {
 	const limit = 10;
 	const offset = (page - 1) * limit;
 
-	const rawDomain = c.req.query('domain') || '';
-	const domain = rawDomain.trim();
-	const rawSiteId = c.req.query('site_id') || '';
-	const siteId = rawSiteId.trim();
+	const rawSiteId = c.req.query('siteId'); // Changed from site_id to siteId to be consistent
+	const siteId = rawSiteId && rawSiteId !== 'default' ? rawSiteId : null;
 
 	let whereSql = '';
 	const params: (string | number)[] = [];
-	if (domain) {
-		const pattern = `%://${domain}/%`;
-		whereSql = 'WHERE post_slug LIKE ? OR post_url LIKE ?';
-		params.push(pattern, pattern);
-	}
 
 	if (siteId) {
-		if (whereSql) {
-			whereSql += ' AND site_id = ?';
-		} else {
-			whereSql = 'WHERE site_id = ?';
-		}
+		whereSql = 'WHERE site_id = ?';
 		params.push(siteId);
 	}
 
diff --git a/cwd-api/src/api/admin/visitAnalytics.ts b/cwd-api/src/api/admin/visitAnalytics.ts
index e0ffe1d..e8aa876 100644
--- a/cwd-api/src/api/admin/visitAnalytics.ts
+++ b/cwd-api/src/api/admin/visitAnalytics.ts
@@ -21,46 +21,25 @@ type VisitPageItem = {
 	postTitle: string | null;
 	postUrl: string | null;
 	pv: number;
-	lastVisitAt: string | null;
+	lastVisitAt: number | null;
 };
 
-function extractDomain(source: string | null | undefined): string | null {
-	if (!source) {
-		return null;
-	}
-	const value = source.trim();
-	if (!value) {
-		return null;
-	}
-	if (!/^https?:\/\//i.test(value)) {
-		return null;
-	}
-	try {
-		const url = new URL(value);
-		return url.hostname.toLowerCase();
-	} catch {
-		return null;
-	}
-}
-
 export const getVisitOverview = async (
 	c: Context<{ Bindings: Bindings }>
 ) => {
 	try {
-		const rawDomain = c.req.query('domain') || '';
-		const domainFilter = rawDomain.trim().toLowerCase();
+		const rawSiteId = c.req.query('siteId');
+		const siteId = rawSiteId && rawSiteId !== 'default' ? rawSiteId : null;
 
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
+		let statsSql = 'SELECT post_slug, post_title, post_url, pv, last_visit_at FROM page_stats';
+		const statsParams: any[] = [];
 
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_visit_daily (id INTEGER PRIMARY KEY AUTOINCREMENT, date TEXT NOT NULL, domain TEXT, count INTEGER NOT NULL DEFAULT 0, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
+		if (siteId) {
+			statsSql += ' WHERE site_id = ?';
+			statsParams.push(siteId);
+		}
 
-		const { results } = await c.env.CWD_DB.prepare(
-			'SELECT post_slug, post_title, post_url, pv, last_visit_at FROM page_stats'
-		).all<{
+		const { results } = await c.env.CWD_DB.prepare(statsSql).bind(...statsParams).all<{
 			post_slug: string;
 			post_title: string | null;
 			post_url: string | null;
@@ -72,15 +51,6 @@ export const getVisitOverview = async (
 		let totalPages = 0;
 
 		for (const row of results) {
-			const domain =
-				extractDomain(row.post_url) ||
-				extractDomain(row.post_slug) ||
-				null;
-
-			if (domainFilter && domain !== domainFilter) {
-				continue;
-			}
-
 			totalPv += row.pv || 0;
 			totalPages += 1;
 		}
@@ -108,9 +78,6 @@ export const getVisitOverview = async (
 		const lastMonthStartDate = new Date(Date.UTC(year, month - 1, 1));
 		const lastMonthEndDate = new Date(monthStartDate.getTime() - 24 * 60 * 60 * 1000);
 
-		// For last week, we need the start date of last week.
-		// weekStartDate is the start of current week.
-		// So lastWeekStartDate is weekStartDate - 7 days.
 		const weekStartDate = (() => {
 			const d = new Date(Date.UTC(year, month, day));
 			const weekday = d.getUTCDay();
@@ -121,8 +88,6 @@ export const getVisitOverview = async (
 		const lastWeekStartDate = new Date(weekStartDate.getTime() - 7 * 24 * 60 * 60 * 1000);
 		const lastWeekEndDate = new Date(weekStartDate.getTime() - 24 * 60 * 60 * 1000);
 
-		// We need to fetch enough history for last month.
-		// The earliest date could be either startDate30 or lastMonthStartDate.
 		let earliestDate = startDate30;
 		if (toKey(lastMonthStartDate) < earliestDate) {
 			earliestDate = toKey(lastMonthStartDate);
@@ -132,19 +97,18 @@ export const getVisitOverview = async (
 		}
 
 		let dailySql =
-			'SELECT date, domain, count FROM page_visit_daily WHERE date >= ?';
+			'SELECT date, count FROM page_visit_daily WHERE date >= ?';
 		const params: string[] = [earliestDate];
 
-		if (domainFilter) {
-			dailySql += ' AND domain = ?';
-			params.push(domainFilter);
+		if (siteId) {
+			dailySql += ' AND site_id = ?';
+			params.push(siteId);
 		}
 
 		const { results: dailyRows } = await c.env.CWD_DB.prepare(dailySql)
 			.bind(...params)
 			.all<{
 				date: string;
-				domain: string | null;
 				count: number;
 			}>();
 
@@ -159,6 +123,7 @@ export const getVisitOverview = async (
 			dailyMap.set(key, (dailyMap.get(key) || 0) + value);
 		}
 
+		// Fallback if no daily data but totalPv exists (rare edge case or initial migration)
 		if (dailyMap.size === 0 && totalPv > 0) {
 			const fallbackDate = now.toISOString().slice(0, 10);
 			dailyMap.set(fallbackDate, totalPv);
@@ -167,9 +132,6 @@ export const getVisitOverview = async (
 		const todayKey = toKey(now);
 		const yesterdayKey = toKey(new Date(now.getTime() - 24 * 60 * 60 * 1000));
 
-		// weekStartDate is already calculated above
-		const weekStartKey = toKey(weekStartDate);
-
 		let todayPv = dailyMap.get(todayKey) || 0;
 		let yesterdayPv = dailyMap.get(yesterdayKey) || 0;
 		let weekPv = 0;
@@ -260,18 +222,21 @@ export const getVisitOverview = async (
 
 export const getVisitPages = async (c: Context<{ Bindings: Bindings }>) => {
 	try {
-		const rawDomain = c.req.query('domain') || '';
-		const domainFilter = rawDomain.trim().toLowerCase();
+		const rawSiteId = c.req.query('siteId');
+		const siteId = rawSiteId && rawSiteId !== 'default' ? rawSiteId : null;
+		
 		const rawOrder = c.req.query('order') || '';
 		const order = rawOrder.trim().toLowerCase() === 'latest' ? 'latest' : 'pv';
 
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
+		let sql = 'SELECT post_slug, post_title, post_url, pv, last_visit_at FROM page_stats';
+		const params: any[] = [];
 
-		const { results } = await c.env.CWD_DB.prepare(
-			'SELECT post_slug, post_title, post_url, pv, last_visit_at FROM page_stats'
-		).all<{
+		if (siteId) {
+			sql += ' WHERE site_id = ?';
+			params.push(siteId);
+		}
+
+		const { results } = await c.env.CWD_DB.prepare(sql).bind(...params).all<{
 			post_slug: string;
 			post_title: string | null;
 			post_url: string | null;
@@ -282,15 +247,6 @@ export const getVisitPages = async (c: Context<{ Bindings: Bindings }>) => {
 		let items: VisitPageItem[] = [];
 
 		for (const row of results) {
-			const domain =
-				extractDomain(row.post_url) ||
-				extractDomain(row.post_slug) ||
-				null;
-
-			if (domainFilter && domain !== domainFilter) {
-				continue;
-			}
-
 			items.push({
 				postSlug: row.post_slug,
 				postTitle: row.post_title,
diff --git a/cwd-api/src/api/public/like.ts b/cwd-api/src/api/public/like.ts
index 899d83f..94ed60e 100644
--- a/cwd-api/src/api/public/like.ts
+++ b/cwd-api/src/api/public/like.ts
@@ -11,6 +11,7 @@ type LikeRequestBody = {
 	postSlug?: string;
 	postTitle?: string;
 	postUrl?: string;
+	siteId?: string;
 };
 
 function getUserIdFromRequest(c: Context<{ Bindings: Bindings }>): string {
@@ -30,24 +31,13 @@ function getUserIdFromRequest(c: Context<{ Bindings: Bindings }>): string {
 	return 'anonymous';
 }
 
-async function ensureLikesTable(env: Bindings) {
-	await env.CWD_DB.prepare(
-		'CREATE TABLE IF NOT EXISTS Likes (id INTEGER PRIMARY KEY AUTOINCREMENT, page_slug TEXT NOT NULL, user_id TEXT NOT NULL, created_at INTEGER NOT NULL, UNIQUE(page_slug, user_id))'
-	).run();
-}
-
-async function ensurePageStatsTable(env: Bindings) {
-	await env.CWD_DB.prepare(
-		'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-	).run();
-}
-
 export const getLikeStatus = async (
 	c: Context<{ Bindings: Bindings }>
 ): Promise<Response> => {
 	try {
 		const rawPostSlug = c.req.query('post_slug') || '';
 		const postSlug = rawPostSlug.trim();
+		const siteId = c.req.query('siteId') || '';
 
 		if (!postSlug) {
 			return c.json({ message: 'post_slug is required' }, 400);
@@ -59,20 +49,18 @@ export const getLikeStatus = async (
 			'';
 		const userId = userIdHeader.trim();
 
-		await ensureLikesTable(c.env);
-
 		const totalRow = await c.env.CWD_DB.prepare(
-			'SELECT COUNT(*) AS count FROM Likes WHERE page_slug = ?'
+			'SELECT COUNT(*) AS count FROM Likes WHERE page_slug = ? AND site_id = ?'
 		)
-			.bind(postSlug)
+			.bind(postSlug, siteId)
 			.first<{ count: number }>();
 
 		let liked = false;
 		if (userId) {
 			const row = await c.env.CWD_DB.prepare(
-				'SELECT id FROM Likes WHERE page_slug = ? AND user_id = ?'
+				'SELECT id FROM Likes WHERE page_slug = ? AND user_id = ? AND site_id = ?'
 			)
-				.bind(postSlug, userId)
+				.bind(postSlug, userId, siteId)
 				.first<{ id: number }>();
 			liked = !!row;
 		}
@@ -108,6 +96,7 @@ export const likePage = async (
 			typeof body.postTitle === 'string' ? body.postTitle.trim() : '';
 		const rawPostUrl =
 			typeof body.postUrl === 'string' ? body.postUrl.trim() : '';
+		const siteId = typeof body.siteId === 'string' ? body.siteId.trim() : '';
 
 		if (!rawPostSlug) {
 			return c.json({ message: 'postSlug is required' }, 400);
@@ -115,38 +104,35 @@ export const likePage = async (
 
 		const userId = getUserIdFromRequest(c);
 
-		await ensureLikesTable(c.env);
-		await ensurePageStatsTable(c.env);
-
 		const now = Date.now();
 
 		const existingLike = await c.env.CWD_DB.prepare(
-			'SELECT id FROM Likes WHERE page_slug = ? AND user_id = ?'
+			'SELECT id FROM Likes WHERE page_slug = ? AND user_id = ? AND site_id = ?'
 		)
-			.bind(rawPostSlug, userId)
+			.bind(rawPostSlug, userId, siteId)
 			.first<{ id: number }>();
 
 		let alreadyLiked = false;
 
 		if (!existingLike) {
 			await c.env.CWD_DB.prepare(
-				'INSERT INTO Likes (page_slug, user_id, created_at) VALUES (?, ?, ?)'
+				'INSERT INTO Likes (page_slug, user_id, created_at, site_id) VALUES (?, ?, ?, ?)'
 			)
-				.bind(rawPostSlug, userId, now)
+				.bind(rawPostSlug, userId, now, siteId)
 				.run();
 		} else {
 			alreadyLiked = true;
 		}
 
 		const pageStatsRow = await c.env.CWD_DB.prepare(
-			'SELECT id FROM page_stats WHERE post_slug = ?'
+			'SELECT id FROM page_stats WHERE post_slug = ? AND site_id = ?'
 		)
-			.bind(rawPostSlug)
+			.bind(rawPostSlug, siteId)
 			.first<{ id: number }>();
 
 		if (!pageStatsRow) {
 			await c.env.CWD_DB.prepare(
-				'INSERT INTO page_stats (post_slug, post_title, post_url, pv, last_visit_at, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?)'
+				'INSERT INTO page_stats (post_slug, post_title, post_url, pv, last_visit_at, created_at, updated_at, site_id) VALUES (?, ?, ?, ?, ?, ?, ?, ?)'
 			)
 				.bind(
 					rawPostSlug,
@@ -155,7 +141,8 @@ export const likePage = async (
 					0,
 					now,
 					now,
-					now
+					now,
+					siteId
 				)
 				.run();
 		} else if (rawPostTitle || rawPostUrl) {
@@ -172,9 +159,9 @@ export const likePage = async (
 		}
 
 		const totalRow = await c.env.CWD_DB.prepare(
-			'SELECT COUNT(*) AS count FROM Likes WHERE page_slug = ?'
+			'SELECT COUNT(*) AS count FROM Likes WHERE page_slug = ? AND site_id = ?'
 		)
-			.bind(rawPostSlug)
+			.bind(rawPostSlug, siteId)
 			.first<{ count: number }>();
 
 		const totalLikes = totalRow?.count || 0;
@@ -193,4 +180,3 @@ export const likePage = async (
 		);
 	}
 };
-
diff --git a/cwd-api/src/api/public/trackVisit.ts b/cwd-api/src/api/public/trackVisit.ts
index 7da99ba..f08594c 100644
--- a/cwd-api/src/api/public/trackVisit.ts
+++ b/cwd-api/src/api/public/trackVisit.ts
@@ -5,6 +5,7 @@ type TrackVisitBody = {
 	postSlug?: string;
 	postTitle?: string;
 	postUrl?: string;
+	siteId?: string;
 };
 
 function extractDomain(source: string | null | undefined): string | null {
@@ -33,19 +34,12 @@ export const trackVisit = async (c: Context<{ Bindings: Bindings }>) => {
 		const rawPostSlug = typeof body.postSlug === 'string' ? body.postSlug.trim() : '';
 		const rawPostTitle = typeof body.postTitle === 'string' ? body.postTitle.trim() : '';
 		const rawPostUrl = typeof body.postUrl === 'string' ? body.postUrl.trim() : '';
+		const rawSiteId = typeof body.siteId === 'string' ? body.siteId.trim() : '';
 
 		if (!rawPostSlug) {
 			return c.json({ message: 'postSlug is required' }, 400);
 		}
 
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_stats (id INTEGER PRIMARY KEY AUTOINCREMENT, post_slug TEXT UNIQUE NOT NULL, post_title TEXT, post_url TEXT, pv INTEGER NOT NULL DEFAULT 0, last_visit_at INTEGER, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
-
-		await c.env.CWD_DB.prepare(
-			'CREATE TABLE IF NOT EXISTS page_visit_daily (id INTEGER PRIMARY KEY AUTOINCREMENT, date TEXT NOT NULL, domain TEXT, count INTEGER NOT NULL DEFAULT 0, created_at INTEGER NOT NULL, updated_at INTEGER NOT NULL)'
-		).run();
-
 		const nowDate = new Date();
 		const nowTs = nowDate.getTime();
 		const nowIso = nowDate.toISOString();
@@ -56,68 +50,51 @@ export const trackVisit = async (c: Context<{ Bindings: Bindings }>) => {
 			extractDomain(rawPostSlug) ||
 			null;
 
-		const existing = await c.env.CWD_DB.prepare(
-			'SELECT id, pv FROM page_stats WHERE post_slug = ?'
+		// Upsert page_stats using ON CONFLICT (site_id, post_slug)
+		await c.env.CWD_DB.prepare(
+			`INSERT INTO page_stats (site_id, post_slug, post_title, post_url, pv, last_visit_at, created_at, updated_at) 
+			 VALUES (?, ?, ?, ?, 1, ?, ?, ?)
+			 ON CONFLICT(site_id, post_slug) DO UPDATE SET 
+			 pv = pv + 1, 
+			 last_visit_at = ?, 
+			 updated_at = ?, 
+			 post_title = excluded.post_title, 
+			 post_url = excluded.post_url`
 		)
-			.bind(rawPostSlug)
-			.first<{ id: number; pv: number }>();
-
-		if (!existing) {
-			await c.env.CWD_DB.prepare(
-				'INSERT INTO page_stats (post_slug, post_title, post_url, pv, last_visit_at, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?, ?)'
+			.bind(
+				rawSiteId,
+				rawPostSlug,
+				rawPostTitle || null,
+				rawPostUrl || null,
+				nowTs,
+				nowTs,
+				nowTs,
+				nowTs,
+				nowTs
 			)
-				.bind(
-					rawPostSlug,
-					rawPostTitle || null,
-					rawPostUrl || null,
-					1,
-					nowTs,
-					nowTs,
-					nowTs
-				)
-				.run();
-		} else {
-			const newPv = (existing.pv || 0) + 1;
-			await c.env.CWD_DB.prepare(
-				'UPDATE page_stats SET post_title = ?, post_url = ?, pv = ?, last_visit_at = ?, updated_at = ? WHERE id = ?'
-			)
-				.bind(
-					rawPostTitle || null,
-					rawPostUrl || null,
-					newPv,
-					nowTs,
-					nowTs,
-					existing.id
-				)
-				.run();
-		}
+			.run();
 
-		let dailyRow:
-			| {
-					id: number;
-					count: number;
-			  }
-			| null = null;
+		// Update page_visit_daily
+		// We try to find a row for (date, site_id, domain)
+		let dailySql = 'SELECT id, count FROM page_visit_daily WHERE date = ? AND site_id = ?';
+		const params: any[] = [today, rawSiteId];
 
 		if (domain) {
-			dailyRow = await c.env.CWD_DB.prepare(
-				'SELECT id, count FROM page_visit_daily WHERE date = ? AND domain = ?'
-			)
-				.bind(today, domain)
-				.first<{ id: number; count: number }>();
+			dailySql += ' AND domain = ?';
+			params.push(domain);
 		} else {
-			dailyRow = await c.env.CWD_DB.prepare(
-				'SELECT id, count FROM page_visit_daily WHERE date = ? AND domain IS NULL'
-			)
-				.bind(today)
-				.first<{ id: number; count: number }>();
+			dailySql += ' AND domain IS NULL';
 		}
 
+		const dailyRow = await c.env.CWD_DB.prepare(dailySql)
+			.bind(...params)
+			.first<{ id: number; count: number }>();
+
 		if (!dailyRow) {
 			await c.env.CWD_DB.prepare(
-				'INSERT INTO page_visit_daily (date, domain, count, created_at, updated_at) VALUES (?, ?, ?, ?, ?)'
+				'INSERT INTO page_visit_daily (date, site_id, domain, count, created_at, updated_at) VALUES (?, ?, ?, 1, ?, ?)'
 			)
-				.bind(today, domain, 1, nowTs, nowTs)
+				.bind(today, rawSiteId, domain, nowTs, nowTs)
 				.run();
 		} else {
 			const newCount = (dailyRow.count || 0) + 1;
@@ -133,4 +110,3 @@ export const trackVisit = async (c: Context<{ Bindings: Bindings }>) => {
 		return c.json({ message: e.message || '记录访问数据失败' }, 500);
 	}
 };
-
diff --git a/cwd-api/src/index.ts b/cwd-api/src/index.ts
index cc644a3..b6443ab 100644
--- a/cwd-api/src/index.ts
+++ b/cwd-api/src/index.ts
@@ -26,7 +26,7 @@ import { getAdminEmail } from './api/admin/getAdminEmail';
 import { setAdminEmail } from './api/admin/setAdminEmail';
 import { testEmail } from './api/admin/testEmail';
 import { getStats } from './api/admin/getStats';
-import { getDomains } from './api/admin/getDomains';
+import { getSites } from './api/admin/getDomains';
 import { trackVisit } from './api/public/trackVisit';
 import { getVisitOverview, getVisitPages } from './api/admin/visitAnalytics';
 import { getLikeStatus, likePage } from './api/public/like';
@@ -36,10 +36,13 @@ import { getLikeStats } from './api/admin/likeStats';
 import { getFeatureSettings, updateFeatureSettings } from './api/admin/featureSettings';
 import { getTelegramSettings, updateTelegramSettings, setupTelegramWebhook, testTelegramMessage } from './api/admin/telegramSettings';
 import { telegramWebhook } from './api/telegram/webhook';
+import { ensureSchema } from './utils/dbMigration';
 
 const app = new Hono<{ Bindings: Bindings }>();
 const VERSION = `${packageJson.version}`;
 
+let MIGRATION_CHECKED = false;
+
 const COMMENT_ADMIN_EMAIL_KEY = 'comment_admin_email';
 const COMMENT_ADMIN_BADGE_KEY = 'comment_admin_badge';
 const COMMENT_AVATAR_PREFIX_KEY = 'comment_avatar_prefix';
@@ -226,6 +229,10 @@ async function saveCommentSettings(
 }
 
 app.use('*', async (c, next) => {
+	if (!MIGRATION_CHECKED) {
+		await ensureSchema(c.env);
+		MIGRATION_CHECKED = true;
+	}
 	console.log('Request:start', {
 		method: c.req.method,
 		path: c.req.path,
@@ -290,7 +297,7 @@ app.post('/admin/import/backup', importBackup);
 app.put('/admin/comments/status', updateStatus);
 app.put('/admin/comments/update', updateComment);
 app.get('/admin/stats/comments', getStats);
-app.get('/admin/stats/domains', getDomains);
+app.get('/admin/stats/sites', getSites);
 app.get('/admin/analytics/overview', getVisitOverview);
 app.get('/admin/analytics/pages', getVisitPages);
 app.get('/admin/likes/list', listLikes);
diff --git a/cwd-api/src/utils/dbMigration.ts b/cwd-api/src/utils/dbMigration.ts
new file mode 100644
index 0000000..61c0d5d
--- /dev/null
+++ b/cwd-api/src/utils/dbMigration.ts
@@ -0,0 +1,133 @@
+import { Bindings } from '../bindings';
+
+export async function ensureSchema(env: Bindings) {
+	try {
+		// 1. Check and migrate page_stats
+		const statsInfo = await env.CWD_DB.prepare('PRAGMA table_info(page_stats)').all();
+		const statsColumns = (statsInfo.results || []) as any[];
+		const hasStatsSiteId = statsColumns.some((col) => col.name === 'site_id');
+
+		if (!hasStatsSiteId && statsColumns.length > 0) {
+			console.log('Migrating page_stats table...');
+			// Create new table with site_id and composite unique constraint
+			await env.CWD_DB.prepare(
+				`CREATE TABLE page_stats_new (
+					id INTEGER PRIMARY KEY AUTOINCREMENT, 
+					site_id TEXT NOT NULL DEFAULT '', 
+					post_slug TEXT NOT NULL, 
+					post_title TEXT, 
+					post_url TEXT, 
+					pv INTEGER NOT NULL DEFAULT 0, 
+					last_visit_at INTEGER, 
+					created_at INTEGER NOT NULL, 
+					updated_at INTEGER NOT NULL, 
+					UNIQUE(site_id, post_slug)
+				)`
+			).run();
+
+			// Copy data
+			await env.CWD_DB.prepare(
+				`INSERT INTO page_stats_new (post_slug, post_title, post_url, pv, last_visit_at, created_at, updated_at) 
+				 SELECT post_slug, post_title, post_url, pv, last_visit_at, created_at, updated_at FROM page_stats`
+			).run();
+
+			// Drop old table
+			await env.CWD_DB.prepare('DROP TABLE page_stats').run();
+
+			// Rename new table
+			await env.CWD_DB.prepare('ALTER TABLE page_stats_new RENAME TO page_stats').run();
+			console.log('Migrated page_stats table successfully.');
+		} else if (statsColumns.length === 0) {
+            // Table doesn't exist, create it directly
+            await env.CWD_DB.prepare(
+				`CREATE TABLE IF NOT EXISTS page_stats (
+					id INTEGER PRIMARY KEY AUTOINCREMENT, 
+					site_id TEXT NOT NULL DEFAULT '', 
+					post_slug TEXT NOT NULL, 
+					post_title TEXT, 
+					post_url TEXT, 
+					pv INTEGER NOT NULL DEFAULT 0, 
+					last_visit_at INTEGER, 
+					created_at INTEGER NOT NULL, 
+					updated_at INTEGER NOT NULL, 
+					UNIQUE(site_id, post_slug)
+				)`
+			).run();
+        }
+
+		// 2. Check and migrate page_visit_daily
+		const dailyInfo = await env.CWD_DB.prepare('PRAGMA table_info(page_visit_daily)').all();
+		const dailyColumns = (dailyInfo.results || []) as any[];
+		const hasDailySiteId = dailyColumns.some((col) => col.name === 'site_id');
+
+		if (!hasDailySiteId && dailyColumns.length > 0) {
+			console.log('Migrating page_visit_daily table...');
+			await env.CWD_DB.prepare('ALTER TABLE page_visit_daily ADD COLUMN site_id TEXT NOT NULL DEFAULT ""').run();
+			console.log('Migrated page_visit_daily table successfully.');
+		} else if (dailyColumns.length === 0) {
+            await env.CWD_DB.prepare(
+                `CREATE TABLE IF NOT EXISTS page_visit_daily (
+                    id INTEGER PRIMARY KEY AUTOINCREMENT, 
+                    date TEXT NOT NULL, 
+                    domain TEXT, 
+                    count INTEGER NOT NULL DEFAULT 0, 
+                    created_at INTEGER NOT NULL, 
+                    updated_at INTEGER NOT NULL,
+                    site_id TEXT NOT NULL DEFAULT ''
+                )`
+            ).run();
+        }
+
+		// 3. Check and migrate Likes
+		const likesInfo = await env.CWD_DB.prepare('PRAGMA table_info(Likes)').all();
+		const likesColumns = (likesInfo.results || []) as any[];
+		const hasLikesSiteId = likesColumns.some((col) => col.name === 'site_id');
+
+		if (!hasLikesSiteId && likesColumns.length > 0) {
+			console.log('Migrating Likes table...');
+			await env.CWD_DB.prepare(
+				`CREATE TABLE Likes_new (
+					id INTEGER PRIMARY KEY AUTOINCREMENT, 
+					site_id TEXT NOT NULL DEFAULT '',
+					page_slug TEXT NOT NULL, 
+					user_id TEXT NOT NULL, 
+					created_at INTEGER NOT NULL, 
+					UNIQUE(site_id, page_slug, user_id)
+				)`
+			).run();
+
+			await env.CWD_DB.prepare(
+				`INSERT INTO Likes_new (page_slug, user_id, created_at) 
+				 SELECT page_slug, user_id, created_at FROM Likes`
+			).run();
+
+			await env.CWD_DB.prepare('DROP TABLE Likes').run();
+			await env.CWD_DB.prepare('ALTER TABLE Likes_new RENAME TO Likes').run();
+			console.log('Migrated Likes table successfully.');
+		} else if (likesColumns.length === 0) {
+			await env.CWD_DB.prepare(
+				`CREATE TABLE IF NOT EXISTS Likes (
+					id INTEGER PRIMARY KEY AUTOINCREMENT, 
+					site_id TEXT NOT NULL DEFAULT '',
+					page_slug TEXT NOT NULL, 
+					user_id TEXT NOT NULL, 
+					created_at INTEGER NOT NULL, 
+					UNIQUE(site_id, page_slug, user_id)
+				)`
+			).run();
+		}
+
+		// 4. Create Indexes
+		await env.CWD_DB.prepare('CREATE INDEX IF NOT EXISTS idx_page_stats_site_id ON page_stats(site_id)').run();
+		await env.CWD_DB.prepare('CREATE INDEX IF NOT EXISTS idx_page_visit_daily_site_id ON page_visit_daily(site_id)').run();
+		await env.CWD_DB.prepare('CREATE INDEX IF NOT EXISTS idx_likes_site_id ON Likes(site_id)').run();
+        // Also ensure Comment index exists (just in case)
+        await env.CWD_DB.prepare('CREATE INDEX IF NOT EXISTS idx_site_id ON Comment(site_id)').run();
+
+	} catch (e) {
+		console.error('Database migration failed:', e);
+		// Don't throw, to allow app to start, but log error. 
+        // Or maybe we should throw? If schema is wrong, queries will fail anyway.
+        // For now, log error.
+	}
+}
diff --git a/docs/guide/frontend-config.md b/docs/guide/frontend-config.md
index 25115e5..fe3e732 100644
--- a/docs/guide/frontend-config.md
+++ b/docs/guide/frontend-config.md
@@ -48,14 +48,14 @@ https://cwd.js.org/cwd.js
 
 ### 参数说明
 
-| 参数           | 类型                    | 必填 | 默认值    | 说明                                     |
-| -------------- | ----------------------- | ---- | --------- | ---------------------------------------- |
-| `el`           | `string \| HTMLElement` | 是   | -         | 挂载元素选择器或 DOM 元素                |
-| `apiBaseUrl`   | `string`                | 是   | -         | API 基础地址                             |
-| `siteId`       | `string`                | 否   | `default` | 站点 ID，用于多站点数据隔离              |
+| 参数           | 类型                    | 必填 | 默认值 | 说明                                     |
+| -------------- | ----------------------- | ---- | ------ | ---------------------------------------- |
+| `el`           | `string \| HTMLElement` | 是   | -      | 挂载元素选择器或 DOM 元素                |
+| `apiBaseUrl`   | `string`                | 是   | -      | API 基础地址                             |
+| `siteId`       | `string`                | 否   | `''`   | 站点 ID，用于多站点数据隔离              |
 | `theme`        | `'light' \| 'dark'`     | 否   | `'light'` | 主题模式                                 |
-| `pageSize`     | `number`                | 否   | `20`      | 每页显示评论数                           |
-| `customCssUrl` | `string`                | 否   | -         | 自定义样式表 URL，追加到 Shadow DOM 底部 |
+| `pageSize`     | `number`                | 否   | `20`   | 每页显示评论数                           |
+| `customCssUrl` | `string`                | 否   | -      | 自定义样式表 URL，追加到 Shadow DOM 底部 |
 
 头像前缀、博主邮箱和标识等信息由后端接口 `/api/config/comments` 提供，无需在前端进行配置。