keep data timestamp in postData

apps/postData.js

@@ -4,7 +4,5 @@ const socket = new WebSocket(`${process.env.BACKEND_URL}/ws/sendData/${process.e
 
 setInterval(() => {
     const data = Meteostanica.getData()[0]
-    delete data.timestamp
-
     socket.send(JSON.stringify(data))
 }, process.env.DATA_POST_INTERVAL * 1000)