GitHub - ahyatt/ekg: The emacs knowledge graph, app for notes and structured data.
apropos: https://github.com/ahyatt/ekg
It is a note taking tools very similar to Org-Roam based on the project triples, which is basically a Triple store for Emacs.
A demonstration of these two projects have been given at the EmacsConf : https://emacsconf.org/2022/talks/sqlite/