Prisma - ### Bug description `prisma migrate dev` command fails when using `multiSchema` with Supabase.

## The fix

[janpio (maintainer)]: The drift is detected because you introspected with db pull (which creates no migration history) and then ran migrate dev, which compares against migration history. Fix: baseline the database first (see Prisma's "baseline your database" docs) so migrate dev sees no drift and never prompts a reset. Going forward, Prisma 6.13.0 made multiSchema GA with "external tables": list Supabase-managed system tables in prisma.config.ts so Prisma leaves them alone.

Thread: gh:prisma/orm#17734