feat: modernized web application

nextjs/src/lib/db.ts

@@ -0,0 +1,23 @@
+import mysql from 'mysql2/promise';
+
+function createPool(): mysql.Pool {
+  const port = process.env.DB_PORT ? parseInt(process.env.DB_PORT, 10) : 3306;
+  return mysql.createPool({
+    connectionLimit: 10,
+    port,
+    host: process.env.DB_ENDPOINT,
+    user: process.env.DB_USER,
+    password: process.env.DB_PASS,
+    database: 'catherine_league',
+    charset: 'utf8mb4',
+  });
+}
+
+let pool: mysql.Pool | undefined;
+
+export function getPool(): mysql.Pool {
+  if (!pool) {
+    pool = createPool();
+  }
+  return pool;
+}