- Document every endpoint's responses (Produces<T>/status codes/validation)
so the generated OpenAPI/Scalar docs carry response schemas and status codes
instead of empty responses
- Cache recently-synced user ids (IMemoryCache, 15 min) in the JWT
TokenValidated handler so user provisioning no longer hits the DB on every
authenticated request
- Add ProblemDetails + UseExceptionHandler for consistent RFC7807 errors
- Add ToCreatedResult ErrorOr helper and use it in the create endpoints
- Normalize the playlists route to lowercase (/playlists)
Verified: booted the Api against RabbitMQ + Postgres in Docker and inspected
/openapi/v1.json — operations now expose response schemas/status codes and the
route is /playlists.
Build: 0 warnings, 0 errors.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>