diff --git a/docs/ACS-login-404-analysis.md b/docs/ACS-login-404-analysis.md
index 7f4ec17..6410e0a 100644
--- a/docs/ACS-login-404-analysis.md
+++ b/docs/ACS-login-404-analysis.md
@@ -67,3 +67,9 @@ Node 서버에 Auth API를 추가했다.
 2026-07-14 Auth API 커밋 배포 후 `POST /api/auth/login` 응답이 404에서 500으로 변경되었다.
 
 판단: 라우터는 배포에 반영되었고, 남은 문제는 운영 DB의 사용자 seed 또는 로그인 처리 중 DB 상태 문제로 좁혀졌다. 다음 배포부터 테스트 계정이 자동 보장되도록 `migrations/005_seed_test_users.sql`을 추가한다.
+
+2026-07-14 after Coolify redeploy, `/api/health` returned `build: auth-seed-20260714`.
+
+However, `/api/auth/diagnostics` reported no `users` or `user_roles` table, and login still returned 500.
+
+Conclusion: runtime migration is not guaranteed when Coolify overrides Dockerfile CMD. Added startup migration in `server/index.ts` so `runMigrations()` executes before the Express server starts.
diff --git a/server/index.ts b/server/index.ts
index f1c4644..5c495a9 100644
--- a/server/index.ts
+++ b/server/index.ts
@@ -8,6 +8,7 @@ import { apiRouter } from './routes/index.js';
 import { platformStatusRouter } from './routes/health.js';
 import { errorHandler } from './http/errors.js';
 import { getPool } from './db/pool.js';
+import { runMigrations } from './db/migrate.js';
 
 const app = express();
 const frontendDist = path.resolve(process.cwd(), 'frontend', 'dist');
@@ -45,6 +46,12 @@ app.get('*', (_req, res) => {
 
 app.use(errorHandler);
 
-app.listen(env.port, () => {
-  console.log(`ACS Node app listening on port ${env.port}`);
-});
+try {
+  await runMigrations();
+  app.listen(env.port, () => {
+    console.log(`ACS Node app listening on port ${env.port}`);
+  });
+} catch (error) {
+  console.error('ACS startup failed', error);
+  process.exitCode = 1;
+}
diff --git a/server/routes/auth.ts b/server/routes/auth.ts
index fa37555..db6cd23 100644
--- a/server/routes/auth.ts
+++ b/server/routes/auth.ts
@@ -181,15 +181,19 @@ router.post('/change-password', asyncRoute(async (req, res) => {
 
 router.post('/diagnostics', asyncRoute(async (_req, res) => {
   const tableResult = await query<{
+    current_schema: string;
     users_table: string | null;
     user_roles_table: string | null;
     sessions_table: string | null;
+    migrations_table: string | null;
   }>(
     `
       SELECT
-        to_regclass('public.users')::text AS users_table,
-        to_regclass('public.user_roles')::text AS user_roles_table,
-        to_regclass('public.user_sessions')::text AS sessions_table
+        current_schema() AS current_schema,
+        to_regclass('users')::text AS users_table,
+        to_regclass('user_roles')::text AS user_roles_table,
+        to_regclass('user_sessions')::text AS sessions_table,
+        to_regclass('schema_migrations')::text AS migrations_table
     `,
   );
   const tables = tableResult.rows[0];
@@ -202,6 +206,8 @@ router.post('/diagnostics', asyncRoute(async (_req, res) => {
     roles: string[];
   }> = [];
   let userQueryError: string | undefined;
+  let migrations: string[] = [];
+  let migrationQueryError: string | undefined;
 
   if (tables?.users_table && tables.user_roles_table) {
     try {
@@ -234,12 +240,25 @@ router.post('/diagnostics', asyncRoute(async (_req, res) => {
     }
   }
 
+  if (tables?.migrations_table) {
+    try {
+      const migrationResult = await query<{ filename: string }>(
+        'SELECT filename FROM schema_migrations ORDER BY filename',
+      );
+      migrations = migrationResult.rows.map((row) => row.filename);
+    } catch (error) {
+      migrationQueryError = error instanceof Error ? error.message : String(error);
+    }
+  }
+
   ok(res, {
     authApi: true,
     checkedAt: new Date().toISOString(),
     tables,
     users,
     userQueryError,
+    migrations,
+    migrationQueryError,
   });
 }));