I don't have a specific recommendation (I could just give out names of tools that seem to match your needs but I can't really say I've used any), but in your place I'd reconsider your last requirement of "no connection to the DB".
In my view the best docs are the ones that take the least effort to keep up-to-date. Consider a tool that's able to dynamically list and extract schemas from your existing tables and generate a nice HTML or diagram that can be used as a quick and up-to-date reference. That will require little or zero maintenance compared to a manual diagramming tool. So I'd start looking there.
Depending on the project and usage I'd also consider exposing the database through an API. This makes documentation much easier too, as there are tools to auto generate API docs and you'll decouple your DB schema + access from its usage, which has its own benefits.
Without knowing the "higher" reality, I'd still call it a simulation. An emulator is capable of replacing the "real" system it's emulating. Maybe that's your view on the topic, but I find it more likely the higher reality is more complex than ours because it contains ours. Therefore our reality could not be an emulation. Lots of speculation though.
I got the HL-L2325DW last year. Connecting it to the WiFi using WPS was really easy. Making the desktop see it was a bit of trial and error, but it was partially thanks to the PDF viewer I was using, so I'd recommend printing from a well established viewer like Okular or the web browser, at least for the first use.
I don't remember having to download any drivers manually from their website btw, I just chose it from the list when setting up a new printer. This process might change with the distro and desktop environment though, I'm using Kubuntu.
In fact, if you're a bit lucky, the printer might even show up as a "discovered device" after you connect it to your network, even with a suggested driver and connection so you just need to press next.
Replace Manjaro for EndeavourOS and it's a fine chart