BrainBase
A second brain is useless if you can't query it. BrainBase is the engine that indexes my personal notes and makes them searchable: every note is chunked, indexed, then retrieved before a model phrases an answer. That's what RAG means, and it is what separates a grounded answer from a plausible one.
It is what feeds this site's chat.
The boundary that matters: private by default
A second brain holds everything, including what is nobody's business. So BrainBase inverts the usual rule: a note is private until it is explicitly marked public.
There is no global switch, no "roughly public" folder, no implicit exception. An unmarked note cannot be served by the chat, even if it answers the question perfectly. That rigidity is deliberate: the only confidentiality boundary that holds is the one that refuses by default.
What it changes for this site
The chat you're using doesn't search "somewhere on the internet", and it doesn't guess either. It searches two corpora: this site's pages, and the part of my notes I have explicitly opened. When neither holds the answer, it tells you it doesn't know.
It is also what makes the site correctable: a wrong answer is fixed at the source, in a note, without republishing anything.
How it plugs in
BrainBase is an engine, not a note-taking app. It sits behind wherever the notes already live and exposes search to whoever is allowed to query it — SiteVox for the public face, an admin console for the private one. Several instances run in parallel, each on its own corpus, none seeing the others.