Need guidance on extending Prisma adapter while maintaining core functionality

[kissngg]

What is the improvement or update you wish to see?

The current documentation lacks clear guidance on how to extend the Prisma adapter while maintaining core functionality.

Specifically:

1. How to extend the basic Auth.js schema with additional fields/relations
2. Best practices for customizing the schema while using the Prisma adapter
3. Examples of successful Prisma adapter extensions
4. Guidelines for maintaining core Auth.js functionality while adding custom fields

While the documentation covers creating custom adapters from scratch, there's no clear guidance on extending the existing Prisma adapter.

Is there any context that might help us understand?

Many developers using Prisma likely have existing database schemas or need additional fields/relations beyond the basic Auth.js schema. Currently, the only documented options are:

1. Using the basic schema as-is
2. Creating a completely custom adapter

There's a gap in documentation for those who want to extend the Prisma adapter while keeping its core functionality.

Does the docs page already exist? Please link to it.

https://authjs.dev/getting-started/adapters/prisma