fix: use entity.save() instead of insert (needed for caching)

src/api/util/handlers/Message.ts

@@ -274,7 +274,7 @@ export async function sendMessage(opts: MessageOptions) {
 	const message = await handleMessage({ ...opts, timestamp: new Date() });
 
 	await Promise.all([
-		Message.insert(message),
+		message.save(),
 		emitEvent({
 			event: "MESSAGE_CREATE",
 			channel_id: opts.channel_id,