Sentry: errors from the duel server, and cron check-ins for the rollup and backup

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0141G6xqLeNRYEtviLWSB5Up

server/src/index.ts

@@ -10,6 +10,7 @@
 //
 // Caddy serves the static site and proxies /api and /ws here.
 
+import * as Sentry from '@sentry/node';
 import { createServer, type IncomingMessage, type ServerResponse } from 'node:http';
 import { WebSocketServer, WebSocket } from 'ws';
 import { RateLimit } from './ratelimit';
@@ -21,6 +22,15 @@ const HOST = process.env.HOST ?? '127.0.0.1';
 const DATA_DIR = process.env.WH_DATA_DIR ?? '../data/rooms';
 const BODY_LIMIT = 16 * 1024;
 
+// Errors go to Sentry when a DSN is set; the SDK drops them otherwise.
+if (process.env.SENTRY_DSN) {
+	Sentry.init({ dsn: process.env.SENTRY_DSN, environment: 'production', tracesSampleRate: 0 });
+}
+process.on('unhandledRejection', (reason) => {
+	console.error(reason);
+	Sentry.captureException(reason);
+});
+
 const rooms = new Rooms(new Store(DATA_DIR));
 /** Opening rooms and taking seats are open to anyone; a script gets a few dozen an hour, not thousands. */
 const doors = new RateLimit(40, 60 * 60 * 1000);
@@ -112,6 +122,7 @@ const server = createServer((req, res) => {
 	handle(req, res).catch((err: unknown) => {
 		if (err instanceof RoomError) return send(res, err.status, { error: err.message });
 		console.error(err);
+		Sentry.captureException(err, { extra: { url: req.url, method: req.method } });
 		send(res, 500, { error: 'Something went wrong on the server.' });
 	});
 });