First commit - es tut schon mal ganz gut

lib/db.ts

@@ -0,0 +1,18 @@
+import mysql from 'mysql2/promise';
+
+let pool: mysql.Pool | null = null;
+
+export function getDbPool() {
+  if (!pool) {
+    pool = mysql.createPool({
+      host: process.env.DB_HOST || 'localhost',
+      user: process.env.DB_USER || 'root',
+      password: process.env.DB_PASSWORD || '',
+      database: process.env.DB_NAME || 'RXF',
+      waitForConnections: true,
+      connectionLimit: 10,
+      queueLimit: 0,
+    });
+  }
+  return pool;
+}