Refactor database connection logic; ensure DB is connected before starting the server

src/index.js

@@ -8,6 +8,7 @@ import { WebSocketServer } from 'ws';
 import authRoutes from './routes/auth.js';
 import lobbyRoutes from './routes/lobby.js';
 import walletRoutes from './routes/wallet.js';
+import pool from './db.js';
 import { setupWebSocket } from './ws.js';
 
 dotenv.config();
@@ -31,7 +32,25 @@ const wss = new WebSocketServer({ server });
 setupWebSocket(wss);
 
 const PORT = Number(process.env.PORT || 4000);
+
+async function ensureDbConnected() {
+  try {
+    const connection = await pool.getConnection();
+    await connection.ping();
+    connection.release();
+  } catch (err) {
+    // eslint-disable-next-line no-console
+    console.error('DB kapcsolat hiba inditas kozben:', err);
+    process.exit(1);
+  }
+}
+
+async function start() {
+  await ensureDbConnected();
   server.listen(PORT, () => {
     // eslint-disable-next-line no-console
     console.log(`Backend fut: http://localhost:${PORT}`);
   });
+}
+
+start();