diff --git a/CLAUDE.md b/CLAUDE.md
index 85cabdfb..d92bc4e1 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -264,6 +264,74 @@ UI: `Pages/Admin/Collection/Index.cshtml` — status 값에 따라 배지 색상
 4. **GetDailyItemChartPriceAsync** (FHKST03010100) — Daily OHLCV data
 5. **GetInvestorTrendAsync** (FHKST01010900) — Investor sentiment (개인/외국인/기관)
 
+## Local Development & Testing (2026-07-11)
+
+### ⚠️ CRITICAL: SSH Tunnel for Remote Database Access
+
+**Never use Docker locally.** Always use SSH tunneling to connect to remote PostgreSQL:
+
+```powershell
+# 1. Setup SSH tunnel (Terminal 1) — forwards local 5432 to remote DB
+ssh -L 127.0.0.1:5432:localhost:5432 kjh2064@178.104.200.7 -N
+
+# 2. Configure appsettings.Development.json
+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=127.0.0.1;Database=quantenginedb;Username=quantengine_app;Password=quantengine_app;Search Path=quantengine;"
+  }
+}
+
+# 3. Start service locally (Terminal 2)
+cd src/dotnet
+dotnet watch run --project QuantEngine.Web
+
+# 4. Access locally
+http://localhost:5265/Account/Login
+```
+
+### Mandatory Pre-Deployment Checklist
+
+**EVERY code change must pass:**
+
+1. ✅ **Local build (0 errors, 0 warnings)**
+   ```powershell
+   dotnet build src/dotnet/QuantEngine.Web/QuantEngine.Web.csproj -c Release
+   ```
+
+2. ✅ **Local service startup with SSH tunnel**
+   - Service must start without DB connection errors
+   - DbUp migrations must succeed
+
+3. ✅ **Login test (admin/quant123!)**
+   - `/Account/Login` must return 200
+   - Authentication flow must complete
+   - Cookie must be set
+
+4. ✅ **All Admin pages must load**
+   - `/Admin/Dashboard` → 200 (NOT 500)
+   - `/Admin/Users` → 200 (NOT 500)
+   - `/Admin/Collection` → 200 (NOT 500)
+   - `/Admin/Monitoring` → 200 (NOT 500)
+   - `/Admin/Operations` → 200 (NOT 500)
+   - **No 500 errors in response body**
+
+5. ✅ **Playwright E2E tests pass**
+   ```powershell
+   npx playwright test tests/e2e/complete-admin-flow.spec.ts
+   ```
+
+### Deployment Gates
+
+**NEVER deploy without:**
+- ❌ Local testing complete
+- ❌ All Admin pages verified (200 status, no 500 errors)
+- ❌ E2E tests passing
+- ❌ Authorization Policy configured (if changes made to Program.cs)
+
+**Deployment failure is better than service outage.** Halt and investigate if local tests fail.
+
+---
+
 ## Notes for Contributors (2026-07-11)
 
 - **SQL Safety**: Whitelist-only table access (enum switch in Repository)
@@ -275,3 +343,4 @@ UI: `Pages/Admin/Collection/Index.cshtml` — status 값에 따라 배지 색상
 - **Legacy Code**: `QuantEngine.Web.Client` folder kept for reference (not in .sln, not built)
 - **Newtonsoft.Json**: Known high-severity vulnerability (GHSA-5crp-9r3c-p9vr); update or replace when feasible
 - **Release Authority**: Python gates (`full-gate`, `prepare-upload-zip`) remain authority; .NET Admin fully operational as of 2026-07-11
+- **Testing Requirement**: All code changes must pass local testing with SSH tunnel to remote DB before deployment (see "Local Development & Testing" above)
diff --git a/tests/e2e/complete-admin-flow.spec.ts b/tests/e2e/complete-admin-flow.spec.ts
new file mode 100644
index 00000000..8fa949d2
--- /dev/null
+++ b/tests/e2e/complete-admin-flow.spec.ts
@@ -0,0 +1,159 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Complete Admin Flow - All Pages', () => {
+  const BASE_URL = 'http://localhost:5000';
+  const LOGIN_URL = `${BASE_URL}/Account/Login`;
+  const ADMIN_DASHBOARD = `${BASE_URL}/Admin/Dashboard`;
+
+  test.beforeEach(async ({ page }) => {
+    // 1. 로그인 페이지 접근
+    await page.goto(LOGIN_URL);
+    await expect(page).toHaveTitle(/Login|로그인/i);
+
+    // 2. 로그인 시도
+    await page.fill('#username', 'admin');
+    await page.fill('#password', 'quant123!');
+    await page.click('button[type="submit"]');
+
+    // 3. 로그인 후 리다이렉트 대기
+    await page.waitForURL(/Admin|Dashboard/);
+  });
+
+  test('Admin Dashboard 접근 가능', async ({ page }) => {
+    console.log('Testing: Admin Dashboard');
+    await page.goto(ADMIN_DASHBOARD);
+
+    // 페이지 로드 확인
+    await expect(page).toHaveTitle(/Dashboard|대시보드/i);
+
+    // 주요 엘리먼트 확인
+    const body = await page.content();
+    expect(body).toContain('Dashboard');
+
+    console.log('✓ Dashboard loaded successfully');
+  });
+
+  test('Admin Users 페이지 접근', async ({ page }) => {
+    console.log('Testing: Users Page');
+    await page.goto(`${BASE_URL}/Admin/Users`);
+
+    // 페이지 로드 확인
+    const statusCode = (await page.goto(`${BASE_URL}/Admin/Users`)).status();
+    expect([200, 301, 302]).toContain(statusCode);
+
+    const content = await page.content();
+    expect(content).not.toContain('500');
+    expect(content).not.toContain('error');
+
+    console.log('✓ Users page accessible');
+  });
+
+  test('Admin Collection 페이지 접근', async ({ page }) => {
+    console.log('Testing: Collection Page');
+    const response = await page.goto(`${BASE_URL}/Admin/Collection`);
+
+    expect(response?.status()).toBeLessThan(400);
+    const content = await page.content();
+    expect(content).not.toContain('500');
+
+    console.log('✓ Collection page accessible');
+  });
+
+  test('Admin Monitoring 페이지 접근', async ({ page }) => {
+    console.log('Testing: Monitoring Page');
+    const response = await page.goto(`${BASE_URL}/Admin/Monitoring`);
+
+    expect(response?.status()).toBeLessThan(400);
+    const content = await page.content();
+    expect(content).not.toContain('500');
+
+    console.log('✓ Monitoring page accessible');
+  });
+
+  test('Admin Operations 페이지 접근', async ({ page }) => {
+    console.log('Testing: Operations Page');
+    const response = await page.goto(`${BASE_URL}/Admin/Operations`);
+
+    expect(response?.status()).toBeLessThan(400);
+    const content = await page.content();
+    expect(content).not.toContain('500');
+
+    console.log('✓ Operations page accessible');
+  });
+
+  test('Users Create 페이지 접근', async ({ page }) => {
+    console.log('Testing: Users Create Page');
+    const response = await page.goto(`${BASE_URL}/Admin/Users/Create`);
+
+    expect(response?.status()).toBeLessThan(400);
+    const content = await page.content();
+    expect(content).not.toContain('500');
+    expect(content).toContain('Create');
+
+    console.log('✓ Users Create page accessible');
+  });
+
+  test('모든 Admin 페이지가 200 이상 500 미만 상태코드 반환', async ({ page }) => {
+    console.log('Testing: All Admin Pages Status Codes');
+
+    const adminPages = [
+      '/Admin/Dashboard',
+      '/Admin/Users',
+      '/Admin/Collection',
+      '/Admin/Monitoring',
+      '/Admin/Operations',
+      '/Admin/Users/Create',
+    ];
+
+    const results = [];
+
+    for (const path of adminPages) {
+      const fullUrl = `${BASE_URL}${path}`;
+      const response = await page.goto(fullUrl);
+      const status = response?.status() || 0;
+
+      results.push({
+        path,
+        status,
+        success: status >= 200 && status < 500,
+      });
+
+      console.log(`  ${path} → ${status} ${status >= 200 && status < 500 ? '✓' : '❌'}`);
+
+      // 각 페이지에서 500 에러가 없는지 확인
+      const content = await page.content();
+      expect(content).not.toContain('500');
+      expect(content).not.toContain('System.InvalidOperationException');
+    }
+
+    // 모든 페이지가 정상인지 확인
+    const allSuccess = results.every(r => r.success);
+    expect(allSuccess).toBe(true);
+
+    console.log('\n✅ All Admin pages passed');
+  });
+
+  test('로그아웃 후 보호된 페이지 접근 불가', async ({ page }) => {
+    console.log('Testing: Access Control');
+
+    // 대시보드 접근 가능 확인
+    let response = await page.goto(ADMIN_DASHBOARD);
+    expect(response?.status()).toBeLessThan(400);
+
+    // 로그아웃 (쿠키 삭제)
+    await page.context().clearCookies();
+
+    // 보호된 페이지 접근 시도
+    response = await page.goto(ADMIN_DASHBOARD);
+
+    // 로그인 페이지로 리다이렉트되거나 401/403 에러
+    const url = page.url();
+    expect(
+      url.includes('/Account/Login') ||
+      url.includes('/Account/AccessDenied') ||
+      (response?.status() && [401, 403].includes(response.status()))
+    ).toBe(true);
+
+    console.log('✓ Access control working correctly');
+  });
+});