pacman -S postgresql postgis
[postgres]$ initdb --locale=C.UTF-8 --encoding=UTF8 -D /var/lib/postgres/data --data-checksums
sudo systemctl start postgresql.service

sudo su - postgres:
psql
> CREATE USER luxagraf WITH PASSWORD 'jw8s0F4' CREATEDB;
> ALTER ROLE luxagraf SUPERUSER;
> exit

createdb luxagraf
psql luxagraf
> CREATE EXTENSION postgis;
> exit
exit
psql -U luxagraf -hlocalhost -d luxagraf < luxagraf.20240821.sql