Stop using prisma's generated client

[huumn]

This has been a stick in my boot since day 1 - mostly due to their client having a very limited feature set especially with regard to transactions. It slows us down a lot to be forced to write wallet touching code in plpgsql as each change, significant or not, requires a migration.

Anyway, the part of prisma that's worth using is the migration tool mostly because it allows us to express the current schema in a human readable way.

I've been very happy with https://github.com/porsager/postgres. I've been using it for https://outer.space and we should replace all usage of the prisma client with that. Most of our queries are hand written anyway as the prisma client doesn't support ltree.