Is threr a way to update certain resources in the same way like the events using Scheduler.events.update()?
Yes, you can use row.update() method:
Thank you. Is there an equivalent method for adding single resource? I found only for removing: DayPilot.Row.remove()
Unfortunately, there is no method for adding new rows. I recommend adding the new resource using the resources array.
Adding a new resource through a direct method would only be more efficient if the new resource were added at the bottom. In all other cases, it would require a full update anyway.