if you are implementing a file-system metaphor within your program, that's when you should just step back and use 9P instead
or hecc, just use the basic file system of your OS
@grainloom but it isn't a file system metaphor... it's a (strange) real-world metaphor, where you have a folder containing references to books. like, a piece of paper saying "a great book: page 101, line 25". and some colorful stickers attached for it to be easily found, tags. or real tags if you want.
A #file is just an interface to an #abstraction.
And actually, a file can contains an #URL, without even disturbing #9P2000. ๐
The advantage of #SQL is #RelationalAlgebra: if you don't need it, files are way better.