diff --git a/db/schema.sql b/db/schema.sql
index 6bae1c1..64f3dcc 100644
--- a/db/schema.sql
+++ b/db/schema.sql
@@ -15,7 +15,9 @@ BEGIN
       name           text,
       picture        text,
       provider       text,
+      first_login_at timestamptz,
       last_login_at  timestamptz,
+      last_logout_at timestamptz,
       can_manage     boolean NOT NULL DEFAULT false,
       created_at     timestamptz NOT NULL DEFAULT now(),
       updated_at     timestamptz NOT NULL DEFAULT now()
@@ -25,3 +27,7 @@ BEGIN
   END IF;
 END $$;
 
+-- Backward-compatible migration (if table already exists)
+ALTER TABLE public.ncue_user ADD COLUMN IF NOT EXISTS first_login_at timestamptz;
+ALTER TABLE public.ncue_user ADD COLUMN IF NOT EXISTS last_logout_at timestamptz;
+
diff --git a/script.js b/script.js
index 83deebf..e414310 100644
--- a/script.js
+++ b/script.js
@@ -666,6 +666,36 @@
     }
   }
 
+  function sendLogoutToServer(idToken) {
+    if (!idToken) return;
+    const cfg = getAuthConfig();
+    const payload = JSON.stringify({ t: Date.now() });
+    // Prefer sendBeacon to survive navigation
+    try {
+      const blob = new Blob([payload], { type: "application/json" });
+      const ok = navigator.sendBeacon("/api/auth/logout", blob);
+      if (ok) return;
+    } catch {
+      // ignore
+    }
+    // Fallback fetch keepalive (best-effort)
+    try {
+      fetch("/api/auth/logout", {
+        method: "POST",
+        headers: {
+          Authorization: `Bearer ${idToken}`,
+          "X-Auth0-Issuer": `https://${cfg.auth0.domain}/`,
+          "X-Auth0-ClientId": cfg.auth0.clientId,
+          "Content-Type": "application/json",
+        },
+        body: payload,
+        keepalive: true,
+      }).catch(() => {});
+    } catch {
+      // ignore
+    }
+  }
+
   function isAllowedEmail(email) {
     const { allowedEmails } = getAuthConfig();
     if (!allowedEmails.length) return true; // 설정이 비어있으면 로그인만으로 허용
@@ -871,6 +901,13 @@
     if (auth.mode !== "enabled") return;
     // SDK가 있으면 SDK로, 없으면 수동 로그아웃
     if (auth.client) {
+      try {
+        const claims = await auth.client.getIdTokenClaims();
+        const raw = claims && claims.__raw ? String(claims.__raw) : "";
+        if (raw) sendLogoutToServer(raw);
+      } catch {
+        // ignore
+      }
       auth.user = null;
       auth.authorized = false;
       updateAuthUi();
@@ -882,6 +919,9 @@
       });
       return;
     }
+    // manual token logout
+    const t = loadTokens();
+    if (t && t.id_token) sendLogoutToServer(t.id_token);
     clearTokens();
     auth.user = null;
     auth.authorized = false;
diff --git a/server.js b/server.js
index 70192c4..13a0806 100644
--- a/server.js
+++ b/server.js
@@ -76,8 +76,31 @@ async function verifyIdToken(idToken, { issuer, audience }) {
   return payload;
 }
 
+async function ensureUserTable() {
+  // Create table if missing + add columns for upgrades
+  await pool.query(`
+    create table if not exists public.${TABLE} (
+      sub            text primary key,
+      email          text,
+      name           text,
+      picture        text,
+      provider       text,
+      first_login_at timestamptz,
+      last_login_at  timestamptz,
+      last_logout_at timestamptz,
+      can_manage     boolean not null default false,
+      created_at     timestamptz not null default now(),
+      updated_at     timestamptz not null default now()
+    )
+  `);
+  await pool.query(`create index if not exists idx_${TABLE}_email on public.${TABLE} (email)`);
+  await pool.query(`alter table public.${TABLE} add column if not exists first_login_at timestamptz`);
+  await pool.query(`alter table public.${TABLE} add column if not exists last_logout_at timestamptz`);
+}
+
 app.post("/api/auth/sync", async (req, res) => {
   try {
+    await ensureUserTable();
     const idToken = getBearer(req);
     if (!idToken) return res.status(401).json({ ok: false, error: "missing_token" });
 
@@ -97,22 +120,51 @@ app.post("/api/auth/sync", async (req, res) => {
 
     const q = `
       insert into public.${TABLE}
-        (sub, email, name, picture, provider, last_login_at, updated_at)
+        (sub, email, name, picture, provider, first_login_at, last_login_at, updated_at)
       values
-        ($1, $2, $3, $4, $5, now(), now())
+        ($1, $2, $3, $4, $5, now(), now(), now())
       on conflict (sub) do update set
         email = excluded.email,
         name = excluded.name,
         picture = excluded.picture,
         provider = excluded.provider,
+        first_login_at = coalesce(public.${TABLE}.first_login_at, excluded.first_login_at),
         last_login_at = now(),
         updated_at = now()
-      returning can_manage
+      returning can_manage, first_login_at, last_login_at, last_logout_at
     `;
     const r = await pool.query(q, [sub, email, name, picture, provider]);
     const canManage = Boolean(r.rows?.[0]?.can_manage);
 
-    res.json({ ok: true, canManage });
+    res.json({ ok: true, canManage, user: r.rows?.[0] || null });
+  } catch (e) {
+    res.status(401).json({ ok: false, error: "verify_failed" });
+  }
+});
+
+app.post("/api/auth/logout", async (req, res) => {
+  try {
+    await ensureUserTable();
+    const idToken = getBearer(req);
+    if (!idToken) return res.status(401).json({ ok: false, error: "missing_token" });
+
+    const issuer = String(req.headers["x-auth0-issuer"] || "").trim();
+    const audience = String(req.headers["x-auth0-clientid"] || "").trim();
+    if (!issuer || !audience) return res.status(400).json({ ok: false, error: "missing_auth0_headers" });
+
+    const payload = await verifyIdToken(idToken, { issuer, audience });
+    const sub = String(payload.sub || "").trim();
+    if (!sub) return res.status(400).json({ ok: false, error: "missing_sub" });
+
+    const q = `
+      update public.${TABLE}
+      set last_logout_at = now(),
+          updated_at = now()
+      where sub = $1
+      returning last_logout_at
+    `;
+    const r = await pool.query(q, [sub]);
+    res.json({ ok: true, last_logout_at: r.rows?.[0]?.last_logout_at || null });
   } catch (e) {
     res.status(401).json({ ok: false, error: "verify_failed" });
   }