[stumped]

I have been working on a book to improve chapterization.

What I do is use delete option on the actual kobo, to remove the book, then connect to pc and resend the need edit from calibre

I observe that when I do that, the series info auto-appears for the resent books, without me having to do the connect , eject, connect, eject dance.to add series data.

So clearly, the kobo retains it. Even after. Book is deleted on device.

That is fine, it is actually helpful, it I wonder what else does not get deleted?

I recall reading somewhere that kobo also copies each added book's toc to somewhere in its little database, which could explain why fixing how kepub headers work is so frustrating ( e.g. chapter title tag daa not always shown )

Is there a way to totally delete a book from kobo. Without having to use the sign out, sign back in drastic overkill.

Is there ore info. Tried in other threads, about what is, is not deleted?