upgrading-to-prisma-6

Prisma 6 introduces four breaking changes: Buffer fields convert to Uint8Array, implicit many-to-many primary keys change, NotFoundError is removed (replaced by P2025), and reserved keywords must be renamed. Each requires schema and application code updates to prevent runtime errors and type mismatches.

Follow four phases: pre-migration assessment to locate Bytes fields, implicit m-n relations, NotFoundError usage, and reserved keywords; schema migration applying @map to reserved names; code migration updating Buffer to Uint8Array and error handling; validation via TypeScript compilation and test migration.

Replace NotFoundError catch blocks with P2025 error code checks. Prisma 6 removes the NotFoundError exception; instead, inspect the thrown error's code property for P2025 to identify not-found scenarios in your application code.

Rename fields and models that conflict with Prisma reserved keywords using the @map directive to preserve database column names. This prevents compilation failures and allows your schema to remain compatible with your existing database structure.

Yes. Generate and validate new migrations after schema changes to ensure implicit m-n relation primary key updates and any structural modifications are captured. Test the migration in a non-production environment before applying to production.

Update Bytes field type annotations and runtime handling from Buffer to Uint8Array. This aligns with Prisma 6's stricter type requirements and ensures compatibility with modern JavaScript environments.