diff --git a/backend/scratch/query-prompts.ts b/backend/scratch/query-prompts.ts
new file mode 100644
index 00000000..aba9dc23
--- /dev/null
+++ b/backend/scratch/query-prompts.ts
@@ -0,0 +1,92 @@
+// File: backend/scratch/query-prompts.ts
+// Change Log
+// - 2026-05-29: Created fully ESLint-compliant database diagnostic utility (ADR-029)
+import * as fs from 'fs';
+import * as path from 'path';
+import { Logger } from '@nestjs/common';
+import * as mysql from 'mysql2/promise';
+
+const logger = new Logger('QueryPromptsDiagnostic');
+
+interface PromptRow {
+  id: number;
+  public_id: string;
+  prompt_type: string;
+  version_number: number;
+  is_active: number;
+  snippet: string;
+}
+
+/**
+ * ดึงข้อมูลการเชื่อมต่อฐานข้อมูลจากไฟล์ .env.local
+ */
+function parseEnvConfig(): Record<string, string> {
+  const config: Record<string, string> = {};
+  try {
+    const envPath = path.join(__dirname, '..', '.env.local');
+    if (fs.existsSync(envPath)) {
+      const content = fs.readFileSync(envPath, 'utf8');
+      content.split('\n').forEach((line) => {
+        const trimmed = line.trim();
+        if (trimmed && !trimmed.startsWith('#') && trimmed.includes('=')) {
+          const parts = trimmed.split('=');
+          const key = parts[0].trim();
+          const val = parts.slice(1).join('=').trim();
+          config[key] = val;
+        }
+      });
+    }
+  } catch (err: unknown) {
+    logger.warn(
+      `ไม่สามารถอ่านไฟล์ .env.local ได้: ${err instanceof Error ? err.message : String(err)}`
+    );
+  }
+  return config;
+}
+
+async function main(): Promise<void> {
+  const env = parseEnvConfig();
+  const dbHost = env.DB_HOST || '127.0.0.1';
+  const dbPort = env.DB_PORT ? Number(env.DB_PORT) : 3306;
+  const dbUser = env.DB_USERNAME || 'admin';
+  const dbPass = env.DB_PASSWORD || 'Center2025';
+  const dbName = env.DB_DATABASE || 'lcbp3_dev';
+
+  logger.log(
+    `กำลังเชื่อมต่อฐานข้อมูลที่ ${dbHost}:${dbPort} (Database: ${dbName})...`
+  );
+
+  const connection = await mysql.createConnection({
+    host: dbHost,
+    port: dbPort,
+    user: dbUser,
+    password: dbPass,
+    database: dbName,
+  });
+
+  try {
+    const [rows] = await connection.execute(
+      'SELECT id, public_id, prompt_type, version_number, is_active, LEFT(template, 30) as snippet FROM ai_prompts'
+    );
+    logger.log('--- ข้อมูลในตาราง ai_prompts ---');
+    const prompts = rows as PromptRow[];
+    prompts.forEach((row) => {
+      logger.log(
+        `[v${row.version_number}] ID: ${row.id} | PublicID: ${row.public_id} | Type: ${row.prompt_type} | Active: ${row.is_active} | Snippet: ${row.snippet}`
+      );
+    });
+  } catch (err: unknown) {
+    logger.error(
+      `เกิดข้อผิดพลาดในการดึงข้อมูล: ${err instanceof Error ? err.message : String(err)}`
+    );
+  } finally {
+    await connection.end();
+  }
+}
+
+// รันฟังก์ชันหลักโดยดักจับข้อผิดพลาดทั้งหมดและป้องกัน floating promise
+main().catch((err: unknown) => {
+  logger.error(
+    `ข้อผิดพลาดร้ายแรงขณะรันสคริปต์: ${err instanceof Error ? err.message : String(err)}`
+  );
+});