Post login (once) opens on back button from Home

What would you expect from the back button (other than going to the previous screen)?

Yes, going to a previous screen should be expected with a back button, but not on a Home screen, and not after a login flow. 

This is a native mobile pattern

So you would rather close the app? I don't think that's possible, neither is deactivating Android core functions

No I wouldnt. i just dont want to go back to login or post login flow once i get to my Home screen, since I use the post login to save Firebase user.id and Username to Airtable using httpbin.

Im using Post login page to fetch the user.id data i just created in Firebase and add a Username, and save all that data to my Airtable so I can filter by that id. There might be a better way to do that but I havent found it on any tutorial since there are pretty skimp on that particular issue.

So the problem is, once I enter my Username and Have user.id fetched from firebase and saved in Airtable (i use invisible text field to not show it just have it there saved) I get to my Home page, and I dont want to go back since going back to postlogin then back to the Home page again, means making another entry in Airtable with the same user.id

I see, that makes sense, thanks for clarifying the use case.