Phase 3 Slice 5 Go-side: ErrInvalidProceedingTypeCategory typed
error + service-layer validation + handler-level mapping +
listing-side filter.
- services.ErrInvalidProceedingTypeCategory: typed error so
handlers can map to a 400 with a bilingual user-facing message
distinct from generic ErrInvalidInput.
- ProjectService.validateProceedingTypeCategory: looks up the
referenced proceeding_types.category and rejects with the typed
error if it's not 'fristenrechner'. Called from both Create and
Update before any DB write.
- DeadlineRuleService.ListProceedingTypesByCategory: extends the
existing ListProceedingTypes with an optional category filter.
Empty category passes through (legacy callers unaffected).
- GET /api/proceeding-types-db?category=<value>: handler reads the
query param and forwards it to the service. The project-create
/ project-edit pickers pass 'fristenrechner' so users never see
retired litigation codes.
- writeServiceError: maps ErrInvalidProceedingTypeCategory to
HTTP 400 with a bilingual message ("Verfahrenstyp muss ein
Fristenrechner-Typ sein / proceeding type must be a
Fristenrechner type"). Distinct from generic ErrInvalidInput so
the frontend can show a more helpful hint.
Defence-in-depth chain: frontend picker filter → service-layer
validation → DB trigger (mig 088). Each backstops the next.
mAi
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