Re: stability of toc links

[Tom Gillespie]

It sounds like you are looking for the CUSTOM_ID property. See
https://orgmode.org/manual/Handling-Links.html and
https://orgmode.org/manual/Internal-Links.html. I don't remember
whether there is a way to generate ids matching headlines within org
itself, but there is
https://github.com/alphapapa/unpackaged.el#export-to-html-with-useful-anchors.
Best!
Tom