Broadcast an already parsed JSON payload

lib/www/server/ws/db.js

@@ -7,6 +7,12 @@ const channels = {};
 async function notify (data) {
 	if (data.channel in channels) {
 		data._received = new Date();
+		try {
+			const json = JSON.parse(data.payload);
+			data.payload = json;
+		} catch {
+			// Ignore the error
+		}
 		for (const listener of channels[data.channel]) {
 			listener(data);
 		}