feat: implement basic file watcher and session updater

server/src/runner.ts

@@ -1,6 +1,37 @@
+import express from 'express';
+import http from 'http';
+
 import { userDb } from "@/shared/database/repositories/users.js";
+import { initializeDatabase } from '@/shared/database/init-db.js';
+import { initializeWatcher } from '@/modules/watcher/file-watcher.js';
 
 console.log("----------------Hello there, Refactored Runner!-------------------");
 
-console.log("User db initialized");
-console.log("First user:", userDb.getFirstUser());
+const app = express();
+const server = http.createServer(app);
+
+const serverPortEnv = process.env.SERVER_PORT;
+const SERVER_PORT = serverPortEnv ? Number.parseInt(serverPortEnv) : 3001;
+
+if (Number.isNaN(SERVER_PORT)) {
+    throw new Error(`Invalid SERVER_PORT value: ${serverPortEnv}`);
+}
+const HOST = process.env.HOST || '0.0.0.0';
+
+async function main() {
+    try {
+        await initializeDatabase();
+
+        server.listen(SERVER_PORT, HOST, async () => {
+            console.log(`Server is running on http://${HOST}:${SERVER_PORT}`);
+
+            await initializeWatcher();
+        });
+
+    } catch (error) {
+        console.error("Failed to initialize database:", error);
+        process.exit(1);
+    }
+}
+
+await main();