备份：修复前完整项目快照 2026-04-19

backend/db.js

@@ -0,0 +1,26 @@
+const { Pool } = require('pg');
+
+const pool = new Pool({
+  host: 'localhost',
+  port: 5432,
+  database: 'company_finance',
+  user: 'postgres',
+  password: 'X123c321@',
+  max: 20,
+  idleTimeoutMillis: 30000,
+  connectionTimeoutMillis: 2000,
+});
+
+pool.on('connect', () => {
+  console.log('✅ PostgreSQL 数据库连接成功');
+});
+
+pool.on('error', (err) => {
+  console.error('❌ PostgreSQL 连接错误:', err);
+  process.exit(-1);
+});
+
+module.exports = {
+  query: (text, params) => pool.query(text, params),
+  pool,
+};