/api/groups and /api/invites refactored, fixed some inserts/updates in which I didn't include the id

src/pages/api/exam/[module]/[id].ts

@@ -48,7 +48,8 @@ async function patch(req: NextApiRequest, res: NextApiResponse) {
 	if (docSnap) {
 		await db.collection(module).updateOne(
 			{ id: id},
-			{ $set: req.body }
+			{ $set: { id: id, ...req.body }},
+			{ upsert: true }
 		);
 		res.status(200).json({ok: true});
 	} else {