docs: add work log for 2026-06-15 and update DB deletion policy in README

scratch/check_public_pcs.cjs

@@ -0,0 +1,40 @@
+const mysql = require('mysql2/promise');
+require('dotenv').config();
+
+async function checkPublicPCs() {
+  const connection = await mysql.createConnection({
+    host: process.env.DB_HOST,
+    user: process.env.DB_USER,
+    password: process.env.DB_PASS,
+    database: process.env.DB_NAME,
+    port: parseInt(process.env.DB_PORT || '3306')
+  });
+
+  console.log('🔍 공용 PC(Public PC)로 추정되는 자산 조회 중...');
+
+  // 사번이 없거나, 사용자명에 '공용'이 포함된 데이터 조회
+  const [rows] = await connection.query(`
+    SELECT id, asset_code, user_current, emp_no, current_dept, asset_type 
+    FROM asset_core 
+    WHERE (emp_no IS NULL OR emp_no = '' OR user_current LIKE '%공용%')
+      AND id LIKE 'PC_20260615_%'
+  `);
+
+  console.log(`📊 발견된 공용 PC 후보: ${rows.length}건`);
+  
+  if (rows.length > 0) {
+    console.table(rows.slice(0, 20)); // 상위 20개 샘플 출력
+    
+    // 요약 통계
+    const summary = {
+      only_no_emp: rows.filter(r => (!r.emp_no) && !r.user_current.includes('공용')).length,
+      only_public_name: rows.filter(r => r.emp_no && r.user_current.includes('공용')).length,
+      both: rows.filter(r => (!r.emp_no) && r.user_current.includes('공용')).length
+    };
+    console.log('\n📈 요약 통계:', summary);
+  }
+
+  await connection.end();
+}
+
+checkPublicPCs().catch(console.error);