add notification cleanup script

cron/notificationCleanup.js

@@ -0,0 +1,26 @@
+import mongoose from "mongoose";
+
+const notifModel = mongoose.model(
+  "notificaiton",
+  new mongoose.Schema(
+    {
+      createdAt: Date,
+    },
+    { strict: false }
+  )
+);
+
+(async () => {
+  console.log(
+    new Date().toISOString() + " Started notification cleanup script..."
+  );
+
+  await mongoose.connect(process.env.DB_URI);
+
+  const fifthDay = new Date(Date.now() - 3600 * 24 * 5 * 1000);
+  const result = await notifModel.deleteMany({ createdAt: { $lt: fifthDay } });
+
+  console.log(`Deleted ${result.deletedCount} notifications`);
+
+  await mongoose.connection.close();
+})().catch((err) => console.log(err));