implemented a simple backend for mobile banking

src/config/db.js

@@ -0,0 +1,20 @@
+const { Pool } = require('pg');
+const { dbUrl } = require('./config');
+const { logger } = require('../util/logger');
+
+const pool = new Pool({
+  connectionString: dbUrl,
+});
+
+pool.on('connect', () => {
+  logger.info('connected to Postgres database');
+});
+
+pool.on('error', (err) => {
+  logger.error(err, 'unexpected database pool error');
+});
+
+module.exports = {
+  query: (text, params) => pool.query(text, params),
+  pool,
+};