We are using prisma ( https://www.prisma.io/ ) as a database abstraction layer. Prisma supports multiple databases but not every database supports every feature. And I don't know if we use any features that are not supported by MySQL.
So for a production environment I would definitely recommend using PostgreSQL.
But if you would like to see if mysql works as well for testing, you can change the prisma schema in packages/database/prisma/schema.prisma
https://www.prisma.io/docs/concepts/database-connectors/mysql
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