ERD
The ER diagrams were created with https://github.com/BurntSushi/erd/.
You can go download erd from https://github.com/BurntSushi/erd/releases and then do:
./erd_static-x86-64 -i film.er -o ../_static/film.png
The fonts used belong to the GNU FreeFont family. You can download them here: http://ftp.gnu.org/gnu/freefont/
LaTeX
The schema structure diagram is done with LaTeX. You can use a GUI like https://www.mathcha.io/editor to create the .tex file.
Then use this command to generate the png file.
postgrest-docs-render
LaTeX is used because it's a tweakable plain text format.
You can install the full latex suite with nix:
nix-env -iA texlive.combined.scheme-full
To tweak the file with a live reload environment use:
# open the pdf(zathura used as an example)
zathura db.pdf &
# live reload with entr
echo db.tex | entr pdflatex --shell-escape -halt-on-error db.tex