How to use 'deleteNodesByTimestamp' with orderByKey ?

[Sulomus]

I have looked into this discussion where I think is described how the function Firebase.RTDB.deleteNodesByTimestamp() works.

With the example data structure it is stated that we need to change the rules for every single device. My question is if this function can also be used with this data structure (timestamps are keys):

And if so then how?
Or should I write my own logic and this function cannot be used?

Right now I am using this function as so (with Index not defined, add \".indexOn\": \"GC01\", for path \"/trends\" error):

/*
30 for last 30 nodes
20 as 20 seconds retention period
*/

Firebase.RTDB.deleteNodesByTimestamp(&fb_do,  "/trends/", "GC01", 30, 20)

[mobizt]

I have to update this function to treat the wild card $key properly.