feat(user notifications): added the ability for users to sub to notifications and add multi email

backend/notification/notificationSub.post.route.ts

@@ -25,8 +25,25 @@ r.post("/", async (req, res: Response) => {
 	try {
 		const validated = newSubscribe.parse(req.body);
 
+		const emails = validated.emails
+			.map((e) => e.trim().toLowerCase())
+			.filter(Boolean);
+
+		const uniqueEmails = [...new Set(emails)];
+
 		const { data, error } = await tryCatch(
-			db.insert(notificationSub).values(validated).returning(),
+			db
+				.insert(notificationSub)
+				.values({
+					userId: req?.user?.id ?? "",
+					notificationId: validated.notificationId,
+					emails: uniqueEmails,
+				})
+				.onConflictDoUpdate({
+					target: [notificationSub.userId, notificationSub.notificationId],
+					set: { emails: uniqueEmails },
+				})
+				.returning(),
 		);
 
 		await modifiedNotification(validated.notificationId);