PoC: Crud skill test 03 Product Varaint

[manuelblum]

Sample PR showcasing how Claude (Opus 4.6) implements full-stack CRUD for a sub-entity from a spec file using Comet
skills. The entire implementation — API entity, admin UI, enum components, nested navigation — was generated from
specs/product/03-product-variant.md. This also includes updating the existing Product entity with a variants
OneToMany relation and a variantCount ResolveField on the Products DataGrid.

What's implemented

Area	Features
API Entity	ProductVariant entity scoped via parent Product relation (async @ScopedEntity with loadOrFail), VariantStatus enum (Active, OutOfStock, Discontinued), DamImageBlock for image, MikroORM migration, NestJS module registration
API Resolver & Service	Full CRUD with dedicated product resolver arg (R2 pattern), SKU uniqueness validation scoped within parent product (SKU_ALREADY_EXISTS field-level error), variantCount ResolveField on Product resolver via em.count()
Translatable Enums	VariantStatus: translatable component, colored chip (green Active, orange Out of Stock, red Discontinued), editable chip with Apollo query/mutation, SelectField for form
DataGrid	Server-side paginated grid filtered by parent product ID. Columns: image thumbnail, name, sku, price (EUR), stock, variantStatus (editable chip with inline status change), isAvailable. Toolbar with search and "New Variant" button
Form	Three FieldSets — "General" (name, sku, variantStatus SelectField), "Pricing & Stock" (price with EUR adornment, stock with non-negative integer validator, isAvailable switch), "Media" (DamImageBlock). Server-side error handling for SKU uniqueness
Pages	RouterTab "Variants" on Product edit page with nested StackSwitch (grid/add/edit). Entity toolbar showing variant name + SKU. Breadcrumb: Products > Product > Variant
Products DataGrid	New variantCount column with grey Chip showing number of variants per product

Spec

See specs/product/03-product-variant.md for the full requirements.

Feature	Screenshot
Product edit page with Product / Variants tabs
Variants DataGrid with status chips
Variant create form (General, Pricing & Stock, Media)
Variant edit page with entity toolbar
Inline status editing via editable chip
Search filtering by name/SKU
Variant count column on Products DataGrid