Prisma Migration

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Based on the knowledge sources provided, I can answer your question about managing migrations with Prisma when using multiple schemas in a single PostgreSQL database.

Prisma currently offers multi-schema support as a preview feature for PostgreSQL. However, it's important to note that this feature is designed for cases where different models are in different schemas, rather than having the same models across multiple schemas for multi-tenancy purposes.

For your specific use case of wanting to add a new feature (Prisma schema) that affects all existing schemas, there isn't a direct built-in solution in Prisma's multi-schema support. The current implementation requires you to define each model for each schema separately, which would lead to duplication in your case.

However, there is a workaround you can use to manage migrations across multiple schemas:

1. Define your Prisma schema with the new feature you want to add.

2. Use environment variables to override the database URL for each schema when running migrations.

3. Run the migration command for each schema separately.

Here's how you can do this:

DATABASE_URL=postgresql:///example.com/db?schema=schema1 npx prisma migrate deploy
DATABASE_URL=postgresql:///example.com/db?schema=schema2 npx prisma migrate deploy
# Repeat for each schema

This approach allows you to apply the same migration to multiple schemas without having to duplicate your Prisma schema for each tenant.

It's worth noting that this method requires some additional scripting on your part to automate the process for all your schemas, but it provides a way to manage migrations across multiple schemas in a single PostgreSQL database.

For more information on Prisma's multi-schema support and migration strategies, you can refer to:

1. How to use Prisma ORM with multiple database schemas
2. [Github Issue: One model to multiple database schemas for multi-tenancy](<h

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ttps://github.com/prisma/prisma/issues/24794>)

Remember that the multi-schema feature is still in preview, and Prisma may introduce more robust solutions for multi-tenancy scenarios in the future.

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