Ensure collection is empty

mongodb-seeder/src/seeder.ts

@@ -18,6 +18,10 @@ export async function seedDatabase(
     // Get the collection instance
     const collection = db.collection(collectionName);
 
+    // Ensure collection is empty
+    const count = await collection.countDocuments();
+    if (count !== 0) throw new Error('Collection already contains documents.');
+
     // Add timestamps to each data object
     const now = new Date();
     const dataWithTimestamps = data.map((item) => ({