Searchable db/Knowledge Management Software [SOLVED - THANKS]

I'm looking for a knowledge management system, or at least I think I am. Scrolling around in a notepad ++ of more than 300k lines gets to be a chore. Yeah, I document just about everything I do. They say that we never really forget anything, and that it's our faulty recall system. Well, my recall system is shit. While Notepad++ does allow searching, I guess I'm looking for something a bit more elegant.

I'm looking for something I can dump my notes into a database and be able to search them for a particular command or phrase. I do use ByteStash for all my compose files, but ByteStash doesn't let me search for commands, or command strings like I keep in my notes, or at least I haven't been able to get ByteStash to do that. It's pretty jammy for compose files tho.

Am I asking for too much? Perhaps someone uses something like this for their notes and such or even something entirely different for notes and documentation.

Kind Regards

ETA: Thank you all for your recommendations. I gave each a serious look. Some of the ones like emacs and logseq I downloaded the windows binary to give them a go. So, the winner is Obsidian. It just seems to mesh with my flow. I found a community plugin that encrypts my notes, and I really like that. I also like the fact that you can specify how long you want Obsidian to remember the encryption password, and then revert back to encrypted. Very handy option with the plugin.

Thanks again.