feat: Implement graceful server shutdown with signal handling and interval clearing.

src/server/index.ts

@@ -155,7 +155,7 @@ app.post('/api/packs/generate', async (req: Request, res: Response) => {
 });
 
 // Global Draft Timer Loop
-setInterval(() => {
+const draftInterval = setInterval(() => {
   const updates = draftManager.checkTimers();
   updates.forEach(({ roomId, draft }) => {
     io.to(roomId).emit('draft_update', draft);
@@ -525,3 +525,25 @@ httpServer.listen(Number(PORT), '0.0.0.0', () => {
     }
   }
 });
+
+const gracefulShutdown = () => {
+  console.log('Received kill signal, shutting down gracefully');
+  clearInterval(draftInterval);
+
+  io.close(() => {
+    console.log('Socket.io closed');
+  });
+
+  httpServer.close(() => {
+    console.log('Closed out remaining connections');
+    process.exit(0);
+  });
+
+  setTimeout(() => {
+    console.error('Could not close connections in time, forcefully shutting down');
+    process.exit(1);
+  }, 10000);
+};
+
+process.on('SIGTERM', gracefulShutdown);
+process.on('SIGINT', gracefulShutdown);