feat(frontend): auto-generate TypeScript types from backend OpenAPI schema

Replace manually maintained types in src/lib/types.ts with auto-generated
types from FastAPI's OpenAPI schema using @hey-api/openapi-ts. The bridge
file re-exports generated types with renames, Require<> augmentations for
fields that are optional in the schema but always present in responses, and
manually added relationship fields excluded from OpenAPI.

- Add openapi-ts.config.ts and generate:api npm script
- Generate types into src/lib/api/generated/types.gen.ts
- Rewrite src/lib/types.ts as bridge with re-exports and augmentations
- Fix null vs undefined mismatches in consumer components
- Remove unused manual type definitions from api.ts
- Update AGENTS.md docs with type generation workflow

AGENTS.md

@@ -51,7 +51,7 @@ When editing frontend code, follow `docs/frontend-design-cookbook.md` and update
 | Add LLM validator | `backend/innercontext/validators/` | Extend `BaseValidator`, return `ValidationResult` |
 | Add i18n strings | `frontend/messages/{en,pl}.json` | Auto-generates to `src/lib/paraglide/` |
 | Modify design system | `frontend/src/app.css` + `docs/frontend-design-cookbook.md` | Update both in same change |
-| Modify types | `frontend/src/lib/types.ts` + `backend/innercontext/models/` | Manual sync, no codegen |
+| Modify types | `backend/innercontext/models/` → `pnpm generate:api` → `frontend/src/lib/types.ts` | Auto-generated from OpenAPI; bridge file may need augmentation |
 
 ## Commands
 
@@ -69,6 +69,7 @@ cd frontend && pnpm check                     # Type check + Svelte validation
 cd frontend && pnpm lint                      # ESLint
 cd frontend && pnpm format                    # Prettier
 cd frontend && pnpm build                     # Production build → build/
+cd frontend && pnpm generate:api              # Regenerate types from backend OpenAPI
 ```
 
 ## Commit Guidelines
@@ -83,7 +84,7 @@ Conventional Commits: `feat(api): ...`, `fix(frontend): ...`, `test(models): ...
 
 ### Cross-Cutting Patterns
 
-- **Type sharing**: Manual sync between `frontend/src/lib/types.ts` and `backend/innercontext/models/`. No code generation.
+- **Type sharing**: Auto-generated from backend OpenAPI schema via `@hey-api/openapi-ts`. Run `cd frontend && pnpm generate:api` after backend model changes. `src/lib/types.ts` is a bridge file with re-exports, renames, and `Require<>` augmentations. See `frontend/AGENTS.md` § Type Generation.
 - **API proxy**: Frontend server-side uses `PUBLIC_API_BASE` (http://localhost:8000). Browser uses `/api` (nginx strips prefix → backend).
 - **Auth**: None. Single-user personal system.
 - **Error flow**: Backend `HTTPException(detail=...)` → Frontend catches `.detail` field → `FlashMessages` or `StructuredErrorDisplay`.

frontend/.prettierignore

@@ -1,6 +1,8 @@
 node_modules
 .svelte-kit
 paraglide
+src/lib/api/generated
+openapi.json
 build
 dist
 .env

frontend/AGENTS.md

@@ -19,7 +19,8 @@ frontend/src/
 │   └── profile/         # User profile
 └── lib/
     ├── api.ts           # Typed fetch wrappers (server: PUBLIC_API_BASE, browser: /api)
-    ├── types.ts         # TypeScript types mirroring backend models (manual sync)
+    ├── types.ts         # Type bridge — re-exports from generated OpenAPI types with augmentations
+    ├── api/generated/   # Auto-generated types from backend OpenAPI schema — DO NOT EDIT
     ├── utils.ts         # cn() class merger, bits-ui types
     ├── utils/           # forms.ts (preventIfNotConfirmed), skin-display.ts (label helpers)
     ├── paraglide/       # Generated i18n runtime — DO NOT EDIT
@@ -123,6 +124,7 @@ pnpm check        # Type check + Svelte validation
 pnpm lint         # ESLint
 pnpm format       # Prettier
 pnpm build        # Production build → build/
+pnpm generate:api # Regenerate TypeScript types from backend OpenAPI schema
 ```
 
 ## Anti-Patterns
@@ -130,3 +132,29 @@ pnpm build        # Production build → build/
 - No frontend tests exist. Only linting + type checking.
 - ESLint `svelte/no-navigation-without-resolve` has `ignoreGoto: true` workaround (upstream bug sveltejs/eslint-plugin-svelte#1327).
 - `src/paraglide/` is a legacy output path — active i18n output is in `src/lib/paraglide/`.
+
+## Type Generation
+
+TypeScript types are auto-generated from the FastAPI backend's OpenAPI schema using `@hey-api/openapi-ts`.
+
+### Workflow
+
+1. Generate `openapi.json` from backend: `cd backend && uv run python -c "import json; from main import app; print(json.dumps(app.openapi(), indent=2))" > ../frontend/openapi.json`
+2. Generate types: `cd frontend && pnpm generate:api`
+3. Output lands in `src/lib/api/generated/types.gen.ts` — **never edit this file directly**.
+
+### Architecture
+
+- **Generated types**: `src/lib/api/generated/types.gen.ts` — raw OpenAPI types, auto-generated.
+- **Bridge file**: `src/lib/types.ts` — re-exports from generated types with:
+  - **Renames**: `ProductWithInventory` → `Product`, `ProductListItem` → `ProductSummary`, `UserProfilePublic` → `UserProfile`, `SkinConditionSnapshotPublic` → `SkinConditionSnapshot`.
+  - **`Require<T, K>` augmentations**: Fields with `default_factory` in SQLModel are optional in OpenAPI but always present in API responses (e.g. `id`, `created_at`, `updated_at`, `targets`, `inventory`).
+  - **Relationship fields**: SQLModel `Relationship()` fields are excluded from OpenAPI schema. Added manually: `MedicationEntry.usage_history`, `Routine.steps`, `RoutineStep.product`, `ProductInventory.product`, `Product.inventory` (with augmented `ProductInventory`).
+  - **Manual types**: `PriceTierSource`, `ShoppingPriority` — inline literals in backend, not named in OpenAPI.
+- **Canonical import**: Always `import type { ... } from '$lib/types'` — never import from `$lib/api/generated` directly.
+
+### When to regenerate
+
+- After adding/modifying backend models or response schemas.
+- After adding/modifying API endpoints that change the OpenAPI spec.
+- After updating the bridge file, run `pnpm check` to verify type compatibility.

frontend/README.md

@@ -69,6 +69,6 @@ Or use the provided systemd service: `../systemd/innercontext-node.service`.
 | File               | Purpose                           |
 | ------------------ | --------------------------------- |
 | `src/lib/api.ts`   | API client (typed fetch wrappers) |
-| `src/lib/types.ts` | Shared TypeScript types           |
+| `src/lib/types.ts` | Type bridge (re-exports from generated OpenAPI types) |
 | `src/app.css`      | Tailwind v4 theme + global styles |
 | `svelte.config.js` | SvelteKit config (adapter-node)   |

frontend/eslint.config.js

@@ -12,6 +12,7 @@ export default [
       "dist",
       "**/paraglide/**",
       "**/lib/paraglide/**",
+      "**/api/generated/**",
     ],
   },
   js.configs.recommended,

frontend/openapi-ts.config.ts

@@ -0,0 +1,14 @@
+import { defineConfig } from "@hey-api/openapi-ts";
+
+export default defineConfig({
+  input: "./openapi.json",
+  output: {
+    path: "src/lib/api/generated",
+  },
+  plugins: [
+    {
+      name: "@hey-api/typescript",
+      enums: false, // union types, matching existing frontend pattern
+    },
+  ],
+});

frontend/package.json

@@ -11,10 +11,12 @@
     "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
     "lint": "eslint .",
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "generate:api": "cd ../backend && uv run python -c \"import json; from main import app; print(json.dumps(app.openapi(), indent=2))\" > ../frontend/openapi.json && cd ../frontend && openapi-ts"
   },
   "devDependencies": {
     "@eslint/js": "^10.0.1",
+    "@hey-api/openapi-ts": "^0.94.0",
     "@internationalized/date": "^3.11.0",
     "@lucide/svelte": "^0.561.0",
     "@sveltejs/adapter-node": "^5.0.0",

frontend/src/lib/api.ts

@@ -1,22 +1,22 @@
 import { browser } from "$app/environment";
 import { PUBLIC_API_BASE } from "$env/static/public";
 import type {
-  ActiveIngredient,
   BatchSuggestion,
   GroomingSchedule,
   LabResult,
+  LabResultListResponse,
   MedicationEntry,
   MedicationUsage,
   PartOfDay,
   Product,
-  ProductSummary,
-  ProductContext,
-  ProductEffectProfile,
   ProductInventory,
+  ProductParseResponse,
+  ProductSummary,
   Routine,
   RoutineSuggestion,
   RoutineStep,
   SkinConditionSnapshot,
+  SkinPhotoAnalysisResponse,
   UserProfile,
 } from "./types";
 
@@ -120,41 +120,6 @@ export const updateInventory = (
 export const deleteInventory = (id: string): Promise<void> =>
   api.del(`/inventory/${id}`);
 
-export interface ProductParseResponse {
-  name?: string;
-  brand?: string;
-  line_name?: string;
-  sku?: string;
-  url?: string;
-  barcode?: string;
-  category?: string;
-  recommended_time?: string;
-  texture?: string;
-  absorption_speed?: string;
-  leave_on?: boolean;
-  price_amount?: number;
-  price_currency?: string;
-  size_ml?: number;
-  pao_months?: number;
-  inci?: string[];
-  actives?: ActiveIngredient[];
-  recommended_for?: string[];
-  targets?: string[];
-  fragrance_free?: boolean;
-  essential_oils_free?: boolean;
-  alcohol_denat_free?: boolean;
-  pregnancy_safe?: boolean;
-  product_effect_profile?: ProductEffectProfile;
-  ph_min?: number;
-  ph_max?: number;
-  context_rules?: ProductContext;
-  min_interval_hours?: number;
-  max_frequency_per_week?: number;
-  is_medication?: boolean;
-  is_tool?: boolean;
-  needle_length_mm?: number;
-}
-
 export const parseProductText = (text: string): Promise<ProductParseResponse> =>
   api.post("/products/parse-text", { text });
 
@@ -283,13 +248,6 @@ export interface LabResultListParams {
   offset?: number;
 }
 
-export interface LabResultListResponse {
-  items: LabResult[];
-  total: number;
-  limit: number;
-  offset: number;
-}
-
 export function getLabResults(
   params: LabResultListParams = {},
 ): Promise<LabResultListResponse> {
@@ -353,21 +311,6 @@ export const updateSkinSnapshot = (
 export const deleteSkinSnapshot = (id: string): Promise<void> =>
   api.del(`/skincare/${id}`);
 
-export interface SkinPhotoAnalysisResponse {
-  overall_state?: string;
-  texture?: string;
-  skin_type?: string;
-  hydration_level?: number;
-  sebum_tzone?: number;
-  sebum_cheeks?: number;
-  sensitivity_level?: number;
-  barrier_state?: string;
-  active_concerns?: string[];
-  risks?: string[];
-  priorities?: string[];
-  notes?: string;
-}
-
 export async function analyzeSkinPhotos(
   files: File[],
 ): Promise<SkinPhotoAnalysisResponse> {

frontend/src/lib/components/ProductForm.svelte

@@ -1,14 +1,12 @@
 <script lang="ts">
 	import { untrack } from 'svelte';
-	import type { Product } from '$lib/types';
-	import type { IngredientFunction } from '$lib/types';
+	import type { Product, IngredientFunction, ProductParseResponse } from '$lib/types';
 	import { Button } from '$lib/components/ui/button';
 	import { Input } from '$lib/components/ui/input';
 	import { Label } from '$lib/components/ui/label';
 	import { Tabs, TabsList, TabsTrigger } from '$lib/components/ui/tabs';
 	import { Card, CardContent, CardHeader, CardTitle } from '$lib/components/ui/card';
 	import { baseSelectClass, baseTextareaClass } from '$lib/components/forms/form-classes';
-	import type { ProductParseResponse } from '$lib/api';
 	import * as m from '$lib/paraglide/messages.js';
 	import { Sparkles, X } from 'lucide-svelte';
 

frontend/src/lib/types.ts

@@ -1,390 +1,112 @@
-// ─── Enums ──────────────────────────────────────────────────────────────────
+// Re-exports from generated OpenAPI types.
+// This bridge file keeps `$lib/types` as the canonical import path while
+// renaming backend response-model names to shorter frontend-friendly names
+// and augmenting types where the OpenAPI schema diverges from runtime:
+// - Relationship fields (SQLModel Relationships excluded from schema)
+// - Default-valued fields marked optional in schema but always present in responses
 
-export type AbsorptionSpeed =
-  | "very_fast"
-  | "fast"
-  | "moderate"
-  | "slow"
-  | "very_slow";
-export type BarrierState = "intact" | "mildly_compromised" | "compromised";
-export type DayTime = "am" | "pm" | "both";
-export type GroomingAction =
-  | "shaving_razor"
-  | "shaving_oneblade"
-  | "dermarolling";
-export type IngredientFunction =
-  | "humectant"
-  | "emollient"
-  | "occlusive"
-  | "exfoliant_aha"
-  | "exfoliant_bha"
-  | "exfoliant_pha"
-  | "retinoid"
-  | "antioxidant"
-  | "soothing"
-  | "barrier_support"
-  | "brightening"
-  | "anti_acne"
-  | "ceramide"
-  | "niacinamide"
-  | "sunscreen"
-  | "peptide"
-  | "hair_growth_stimulant"
-  | "prebiotic"
-  | "vitamin_c"
-  | "anti_aging";
-export type MedicationKind =
-  | "prescription"
-  | "otc"
-  | "supplement"
-  | "herbal"
-  | "other";
-export type OverallSkinState = "excellent" | "good" | "fair" | "poor";
-export type PartOfDay = "am" | "pm";
-export type PriceTier = "budget" | "mid" | "premium" | "luxury";
+import type {
+  GroomingSchedule as _GroomingSchedule,
+  LabResult as _LabResult,
+  LabResultListResponse as _LabResultListResponse,
+  MedicationEntry as _MedicationEntry,
+  MedicationUsage as _MedicationUsage,
+  ProductInventory as _ProductInventory,
+  ProductListItem as _ProductListItem,
+  ProductWithInventory as _ProductWithInventory,
+  Routine as _Routine,
+  RoutineStep as _RoutineStep,
+  SkinConditionSnapshotPublic as _SkinConditionSnapshotPublic,
+} from "./api/generated/types.gen";
+
+type Require<T, K extends keyof T> = Omit<T, K> & Required<Pick<T, K>>;
+
+export type {
+  AbsorptionSpeed,
+  ActiveIngredient,
+  BarrierState,
+  BatchSuggestion,
+  DayPlan,
+  DayTime,
+  GroomingAction,
+  IngredientFunction,
+  MedicationKind,
+  OverallSkinState,
+  PartOfDay,
+  PriceTier,
+  ProductCategory,
+  ProductContext,
+  ProductEffectProfile,
+  ProductParseResponse,
+  ProductSuggestion,
+  RemainingLevel,
+  ResponseMetadata,
+  ResultFlag,
+  RoutineSuggestion,
+  RoutineSuggestionSummary,
+  SexAtBirth,
+  ShoppingSuggestionResponse,
+  SkinConcern,
+  SkinPhotoAnalysisResponse,
+  SkinTexture,
+  SkinType,
+  StrengthLevel,
+  SuggestedStep,
+  TextureType,
+  TokenMetrics,
+} from "./api/generated/types.gen";
+
+export type { ProductWithInventory } from "./api/generated/types.gen";
+export type { UserProfilePublic as UserProfile } from "./api/generated/types.gen";
+
+// Inline literal types in backend — not named schemas in OpenAPI
 export type PriceTierSource = "category" | "fallback" | "insufficient_data";
-export type RemainingLevel = "high" | "medium" | "low" | "nearly_empty";
-export type ProductCategory =
-  | "cleanser"
-  | "toner"
-  | "essence"
-  | "serum"
-  | "moisturizer"
-  | "spf"
-  | "mask"
-  | "exfoliant"
-  | "hair_treatment"
-  | "tool"
-  | "spot_treatment"
-  | "oil";
-export type ResultFlag = "N" | "ABN" | "POS" | "NEG" | "L" | "H";
-export type SkinConcern =
-  | "acne"
-  | "rosacea"
-  | "hyperpigmentation"
-  | "aging"
-  | "dehydration"
-  | "redness"
-  | "damaged_barrier"
-  | "pore_visibility"
-  | "uneven_texture"
-  | "hair_growth"
-  | "sebum_excess";
-export type SkinTexture = "smooth" | "rough" | "flaky" | "bumpy";
-export type SexAtBirth = "male" | "female" | "intersex";
-export type SkinType =
-  | "dry"
-  | "oily"
-  | "combination"
-  | "sensitive"
-  | "normal"
-  | "acne_prone";
-export type StrengthLevel = 1 | 2 | 3;
-export type TextureType =
-  | "watery"
-  | "gel"
-  | "emulsion"
-  | "cream"
-  | "oil"
-  | "balm"
-  | "foam"
-  | "fluid";
-// ─── Product types ───────────────────────────────────────────────────────────
+export type ShoppingPriority = "high" | "medium" | "low";
 
-export interface ActiveIngredient {
-  name: string;
-  percent?: number;
-  functions: IngredientFunction[];
-  strength_level?: StrengthLevel;
-  irritation_potential?: StrengthLevel;
-}
+// Response types: required fields + relationship augmentations.
 
-export interface ProductEffectProfile {
-  hydration_immediate: number;
-  hydration_long_term: number;
-  barrier_repair_strength: number;
-  soothing_strength: number;
-  exfoliation_strength: number;
-  retinoid_strength: number;
-  irritation_risk: number;
-  comedogenic_risk: number;
-  barrier_disruption_risk: number;
-  dryness_risk: number;
-  brightening_strength: number;
-  anti_acne_strength: number;
-  anti_aging_strength: number;
-}
-
-export interface ProductContext {
-  safe_after_shaving?: boolean;
-  safe_after_acids?: boolean;
-  safe_after_retinoids?: boolean;
-  safe_with_compromised_barrier?: boolean;
-  low_uv_only?: boolean;
-}
-
-export interface ProductInventory {
-  id: string;
-  product_id: string;
-  is_opened: boolean;
-  opened_at?: string;
-  finished_at?: string;
-  expiry_date?: string;
-  remaining_level?: RemainingLevel;
-  notes?: string;
-  created_at: string;
-  product?: Product;
-}
-
-export interface Product {
-  id: string;
-  name: string;
-  brand: string;
-  line_name?: string;
-  sku?: string;
-  url?: string;
-  barcode?: string;
-  category: ProductCategory;
-  recommended_time: DayTime;
-  texture?: TextureType;
-  absorption_speed?: AbsorptionSpeed;
-  leave_on: boolean;
-  price_amount?: number;
-  price_currency?: string;
-  price_tier?: PriceTier;
-  price_per_use_pln?: number;
-  price_tier_source?: PriceTierSource;
-  size_ml?: number;
-  pao_months?: number;
-  inci: string[];
-  actives?: ActiveIngredient[];
-  recommended_for: SkinType[];
-  targets: SkinConcern[];
-  fragrance_free?: boolean;
-  essential_oils_free?: boolean;
-  alcohol_denat_free?: boolean;
-  pregnancy_safe?: boolean;
-  product_effect_profile: ProductEffectProfile;
-  ph_min?: number;
-  ph_max?: number;
-  context_rules?: ProductContext;
-  min_interval_hours?: number;
-  max_frequency_per_week?: number;
-  is_medication: boolean;
-  is_tool: boolean;
-  needle_length_mm?: number;
-  personal_tolerance_notes?: string;
-  created_at: string;
-  updated_at: string;
+export type Product = Require<
+  _ProductWithInventory,
+  "id" | "created_at" | "updated_at" | "inventory" | "inci" | "recommended_for" | "targets"
+> & {
   inventory: ProductInventory[];
-}
+};
 
-export interface ProductSummary {
-  id: string;
-  name: string;
-  brand: string;
-  category: ProductCategory;
-  recommended_time: DayTime;
-  targets: SkinConcern[];
-  is_owned: boolean;
-  price_tier?: PriceTier;
-  price_per_use_pln?: number;
-  price_tier_source?: PriceTierSource;
-}
+export type ProductSummary = Require<_ProductListItem, "id" | "targets">;
 
-// ─── Routine types ───────────────────────────────────────────────────────────
+export type SkinConditionSnapshot = Require<
+  _SkinConditionSnapshotPublic,
+  "id" | "created_at" | "active_concerns" | "risks" | "priorities"
+>;
 
-export interface RoutineStep {
-  id: string;
-  routine_id: string;
-  product_id?: string;
-  order_index: number;
-  action_type?: GroomingAction;
-  action_notes?: string;
-  dose?: string;
-  region?: string;
-  product?: Product;
-}
+export type GroomingSchedule = Require<_GroomingSchedule, "id">;
 
-export interface Routine {
-  id: string;
-  routine_date: string;
-  part_of_day: PartOfDay;
-  notes?: string;
-  created_at: string;
-  updated_at: string;
-  steps?: RoutineStep[];
-}
+export type LabResult = Require<_LabResult, "record_id" | "created_at" | "updated_at">;
 
-export interface GroomingSchedule {
-  id: string;
-  day_of_week: number;
-  action: GroomingAction;
-  notes?: string;
-}
+export type LabResultListResponse = Omit<_LabResultListResponse, "items"> & {
+  items: LabResult[];
+};
 
-export interface SuggestedStep {
-  product_id?: string;
-  action_type?: GroomingAction;
-  action_notes?: string;
-  region?: string;
-  why_this_step?: string;
-  optional?: boolean;
-}
+export type MedicationUsage = Require<
+  _MedicationUsage,
+  "record_id" | "created_at" | "updated_at"
+>;
 
-export interface RoutineSuggestionSummary {
-  primary_goal: string;
-  constraints_applied: string[];
-  confidence: number;
-}
-
-// Phase 3: Observability metadata types
-export interface TokenMetrics {
-  prompt_tokens: number;
-  completion_tokens: number;
-  thoughts_tokens?: number;
-  total_tokens: number;
-}
-
-export interface ResponseMetadata {
-  model_used: string;
-  duration_ms: number;
-  reasoning_chain?: string;
-  token_metrics?: TokenMetrics;
-}
-
-export interface RoutineSuggestion {
-  steps: SuggestedStep[];
-  reasoning: string;
-  summary?: RoutineSuggestionSummary;
-  // Phase 3: Observability fields
-  validation_warnings?: string[];
-  auto_fixes_applied?: string[];
-  response_metadata?: ResponseMetadata;
-}
-
-export interface DayPlan {
-  date: string;
-  am_steps: SuggestedStep[];
-  pm_steps: SuggestedStep[];
-  reasoning: string;
-}
-
-export interface BatchSuggestion {
-  days: DayPlan[];
-  overall_reasoning: string;
-  // Phase 3: Observability fields
-  validation_warnings?: string[];
-  auto_fixes_applied?: string[];
-  response_metadata?: ResponseMetadata;
-}
-
-// ─── Shopping suggestion types ───────────────────────────────────────────────
-
-export type ShoppingPriority = 'high' | 'medium' | 'low';
-
-export interface ProductSuggestion {
-  category: string;
-  product_type: string;
-  priority: ShoppingPriority;
-  key_ingredients: string[];
-  target_concerns: string[];
-  recommended_time: string;
-  frequency: string;
-  short_reason: string;
-  reason_to_buy_now: string;
-  reason_not_needed_if_budget_tight?: string;
-  fit_with_current_routine: string;
-  usage_cautions: string[];
-}
-
-export interface ShoppingSuggestionResponse {
-  suggestions: ProductSuggestion[];
-  reasoning: string;
-  // Phase 3: Observability fields
-  validation_warnings?: string[];
-  auto_fixes_applied?: string[];
-  response_metadata?: ResponseMetadata;
-}
-
-// ─── Health types ────────────────────────────────────────────────────────────
-
-export interface MedicationUsage {
-  record_id: string;
-  medication_record_id: string;
-  dose_value?: number;
-  dose_unit?: string;
-  frequency?: string;
-  schedule_text?: string;
-  as_needed: boolean;
-  valid_from: string;
-  valid_to?: string;
-  source_file?: string;
-  notes?: string;
-  created_at: string;
-  updated_at: string;
-}
-
-export interface MedicationEntry {
-  record_id: string;
-  kind: MedicationKind;
-  product_name: string;
-  active_substance?: string;
-  formulation?: string;
-  route?: string;
-  source_file?: string;
-  notes?: string;
-  created_at: string;
-  updated_at: string;
+export type MedicationEntry = Require<
+  _MedicationEntry,
+  "record_id" | "created_at" | "updated_at"
+> & {
   usage_history: MedicationUsage[];
-}
+};
 
-export interface LabResult {
-  record_id: string;
-  collected_at: string;
-  test_code: string;
-  test_name_original?: string;
-  test_name_loinc?: string;
-  value_num?: number;
-  value_text?: string;
-  value_bool?: boolean;
-  unit_original?: string;
-  unit_ucum?: string;
-  ref_low?: number;
-  ref_high?: number;
-  ref_text?: string;
-  flag?: ResultFlag;
-  lab?: string;
-  source_file?: string;
-  notes?: string;
-  created_at: string;
-  updated_at: string;
-}
+export type ProductInventory = Require<_ProductInventory, "id" | "created_at"> & {
+  product?: _ProductWithInventory;
+};
 
-// ─── Skin types ──────────────────────────────────────────────────────────────
+export type Routine = Require<_Routine, "id" | "created_at" | "updated_at"> & {
+  steps?: RoutineStep[];
+};
 
-export interface SkinConditionSnapshot {
-  id: string;
-  snapshot_date: string;
-  overall_state?: OverallSkinState;
-  skin_type?: SkinType;
-  texture?: SkinTexture;
-  hydration_level?: number;
-  sebum_tzone?: number;
-  sebum_cheeks?: number;
-  sensitivity_level?: number;
-  barrier_state?: BarrierState;
-  active_concerns: SkinConcern[];
-  risks: string[];
-  priorities: string[];
-  notes?: string;
-  created_at: string;
-}
-
-export interface UserProfile {
-  id: string;
-  birth_date?: string;
-  sex_at_birth?: SexAtBirth;
-  created_at: string;
-  updated_at: string;
-}
+export type RoutineStep = Require<_RoutineStep, "id"> & {
+  product?: _ProductWithInventory;
+};

frontend/src/routes/products/+page.svelte

@@ -49,7 +49,7 @@
 		return a.localeCompare(b, undefined, { sensitivity: 'base' });
 	}
 
-	function comparePrice(a?: number, b?: number): number {
+	function comparePrice(a?: number | null, b?: number | null): number {
 		if (a == null && b == null) return 0;
 		if (a == null) return 1;
 		if (b == null) return -1;
@@ -109,12 +109,12 @@
 	const totalCount = $derived(groupedProducts.reduce((s, [, arr]) => s + arr.length, 0));
 	const ownedCount = $derived(data.products.filter((product) => product.is_owned).length);
 
-	function formatPricePerUse(value?: number): string {
+	function formatPricePerUse(value?: number | null): string {
 		if (value == null) return '-';
 		return `${value.toFixed(2)} ${m.common_pricePerUse()}`;
 	}
 
-	function formatTier(value?: string): string {
+	function formatTier(value?: string | null): string {
 		if (!value) return m.common_unknown();
 		if (value === 'budget') return m['productForm_priceBudget']();
 		if (value === 'mid') return m['productForm_priceMid']();
@@ -123,7 +123,7 @@
 		return value;
 	}
 
-	function getPricePerUse(product: ProductSummary): number | undefined {
+	function getPricePerUse(product: ProductSummary): number | null | undefined {
 		return product.price_per_use_pln;
 	}
 

frontend/src/routes/products/[id]/+page.svelte

@@ -65,7 +65,7 @@
 		return (product as { price_per_use_pln?: number }).price_per_use_pln;
 	}
 
-	function formatTier(value?: string): string {
+	function formatTier(value?: string | null): string {
 		if (!value) return m.common_unknown();
 		if (value === 'budget') return m['productForm_priceBudget']();
 		if (value === 'mid') return m['productForm_priceMid']();
@@ -248,7 +248,7 @@
 													editingInventoryId = null;
 												} else {
 													editingInventoryId = pkg.id;
-													editingInventoryOpened = { ...editingInventoryOpened, [pkg.id]: pkg.is_opened };
+													editingInventoryOpened = { ...editingInventoryOpened, [pkg.id]: pkg.is_opened ?? false };
 												}
 											}}
 										>