Refactor code structure for improved readability and maintainability

test-db.js

@@ -0,0 +1,17 @@
+const { MongoClient } = require('mongodb');
+
+async function check() {
+    const uri = process.env.MONGODB_URI || "mongodb://localhost:27017/reader";
+    const client = new MongoClient(uri);
+    try {
+        await client.connect();
+        const db = client.db();
+        // Just find the latest 5 chapters inserted
+        const docs = await db.collection('Chapter').find({}).sort({ _id: -1 }).limit(10).toArray();
+        console.log("Recent chapters:");
+        docs.forEach(d => console.log(d.novelId, d.number, d.title));
+    } finally {
+        await client.close();
+    }
+}
+check();