This may be a dumb question but… let’s say I have three projects locally and I want to use a Prisma setup in each one. So I have three docker-compose files, how does Docker/Prisma differentiate between them?

Docker creates 'volumes and images' based on your folder name, to make sure your data persists separately from those folders if the names are the same or similar without making a mess of your instance, you could change your database volume name within your docker-compose file. In the image below you change

volumes: postgres

to whatever name you want, make sure to do that when connecting the data folder to your volume too:

volumes:
- postgres:/var/lib/postgresql/data

Here you change postgres: to the named volume, if that make sense.

Ah this makes the most sense, thanks man