On the plus side that means it’ll be pretty quick and easy to implement.

But as always, I’m sure they’ll ask “ok but can it also do this?” and at that point you need to weigh the cost of your time vs buying one of those products.

The only other options I’m aware of are just using something like phpmysql or whatever the postgres equivalent is called, or maybe some FOSS alternative to powerbi. Maybe libreoffice calc can connect to SQL?