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old.cms.fellies.org/docs/product-engineering/critical-invariants.md

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# Critical Invariants
These rules must stay true across refactors and feature work.
## Auth and User Invariants
- Exactly one owner user must exist.
- The canonical owner must remain protected and not banned.
- Support user is system-owned and protected.
- Protected users cannot be deleted through auth endpoints.
- First owner bootstrap closes open owner-registration window.
Primary implementation:
- `apps/admin/src/lib/auth/server.ts`
- `apps/admin/src/app/api/auth/[...all]/route.ts`
Primary tests:
- `apps/admin/src/lib/auth/server.test.ts`
- `apps/admin/src/app/register/page.test.tsx`
- `apps/admin/src/app/welcome/page.test.tsx`
- `apps/admin/src/app/login/page.test.tsx`
## Registration Policy Invariants
- If no owner exists:
`welcome` flow is open for first owner bootstrap.
- If owner exists:
self-registration depends on persisted policy in `system_setting`.
- Register route must never silently create users when policy is disabled.
Primary implementation:
- `packages/db/src/settings.ts`
- `apps/admin/src/app/settings/page.tsx`
- `apps/admin/src/app/register/page.tsx`
## Media Storage Contract
- Storage provider is selected by `CMS_MEDIA_STORAGE_PROVIDER`.
- S3 is primary; local is explicit fallback.
- Each media asset stores a stable `storageKey`.
- Deleting a media asset must also attempt storage object deletion.
Primary implementation:
- `apps/admin/src/lib/media/storage.ts`
- `apps/admin/src/lib/media/storage-key.ts`
- `apps/admin/src/app/media/[id]/page.tsx`
## Public Rendering Contract
- Public pages must render only published CMS pages.
- Public navigation must be built from managed menu items.
- Header banner and announcements must be optional and fail-safe.
Primary implementation:
- `apps/web/src/app/[locale]/layout.tsx`
- `apps/web/src/app/[locale]/page.tsx`
- `apps/web/src/app/[locale]/[slug]/page.tsx`