@core / pricing

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1.0.0

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Pricing from cost: markup rules by category/supplier/product, charm rounding, margin alerts and EU 30-day price history

Code6 filesContext~485 tokensscan passed

~485 tokens→ src/lib/pricing/AGENTS.md→ .cursor/rules/genpm-core-pricing.mdc

This is exactly what your AI reads when it works in src/lib/pricing. Nothing else is added to its context.

@core/pricing — rules for AI agents

Purpose

Turns costs into selling prices and keeps price changes honest. Rules (scope all / category / supplier / product, cost range, markup in basis points, fixed add-on, charm rounding, minimum margin, priority) pick the most specific match; repriceProduct applies them to variants with a cost. Every price change goes to price_history, which gives the EU "prior price" (lowest of the 30 days before the current price) for any sale badge. Tables: price_rules, price_history.

Map

index.ts — public API: upsertPriceRule, priceFromCost, applyRule, repriceProduct, setVariantPrice, priorPrice, honestCompareAt, lowMarginVariants, priceRulesAdminResource.
pricing.ts — logic. admin.ts — admin resource. schema.ts — tables.

Integration

Migrations as in src/lib/db/AGENTS.md.
Create rules in the admin (priceRulesAdminResource in src/genpm/admin.ts, permissions pricing:read|update), e.g. markupBps: 15000 (+150 %), rounding .99.
Change prices only with setVariantPrice(variantId, amount) (also from the admin and supplier syncs) so history is kept.
Product pages: show a crossed-out price only with honestCompareAt(variantId); never with a typed "compare at".
Simulate before applying: repriceProduct(productId, { apply: false }) returns old/new price and margin per variant.
Verify: lower a price, honestCompareAt returns the lowest price of the previous 30 days.

Conventions

Amounts in minor units; markup and margins in basis points (10000 = 100 %).
Review lowMarginVariants() after cost changes; items below their rule's minimum must not be sold silently.

Don't

Don't update priceAmount directly or invent "was" prices; that breaks the 30-day rule (Omnibus Directive).
Don't raise a price shortly before a sale to inflate the discount.
Don't expose costs or margins in public pages or APIs.

# @core/pricing — rules for AI agents

## Purpose
Turns costs into selling prices and keeps price changes honest. Rules (scope all / category / supplier / product,
cost range, markup in basis points, fixed add-on, charm rounding, minimum margin, priority) pick the most specific
match; `repriceProduct` applies them to variants with a cost. Every price change goes to `price_history`, which gives
the EU "prior price" (lowest of the 30 days before the current price) for any sale badge. Tables: `price_rules`, `price_history`.

## Map
- `index.ts` — public API: `upsertPriceRule`, `priceFromCost`, `applyRule`, `repriceProduct`, `setVariantPrice`, `priorPrice`, `honestCompareAt`, `lowMarginVariants`, `priceRulesAdminResource`.
- `pricing.ts` — logic. `admin.ts` — admin resource. `schema.ts` — tables.

## Integration
1. Migrations as in `src/lib/db/AGENTS.md`.
2. Create rules in the admin (`priceRulesAdminResource` in `src/genpm/admin.ts`, permissions `pricing:read|update`), e.g. `markupBps: 15000` (+150 %), rounding `.99`.
3. Change prices only with `setVariantPrice(variantId, amount)` (also from the admin and supplier syncs) so history is kept.
4. Product pages: show a crossed-out price only with `honestCompareAt(variantId)`; never with a typed "compare at".
5. Simulate before applying: `repriceProduct(productId, { apply: false })` returns old/new price and margin per variant.
6. Verify: lower a price, `honestCompareAt` returns the lowest price of the previous 30 days.

## Conventions
- Amounts in minor units; markup and margins in basis points (10000 = 100 %).
- Review `lowMarginVariants()` after cost changes; items below their rule's minimum must not be sold silently.

## Don't
- Don't update `priceAmount` directly or invent "was" prices; that breaks the 30-day rule (Omnibus Directive).
- Don't raise a price shortly before a sale to inflate the discount.
- Don't expose costs or margins in public pages or APIs.

The exact tree that will be injected, after .genpmignore. Pinned to

src/lib/pricing/index.tsread-only · 6aa4077

// @core/pricing — API pública. Importa desde aquí.
export { priceRulesAdminResource } from './admin.ts';
export {
  applyRule,
  honestCompareAt,
  lowMarginVariants,
  marginBps,
  type PriceQuote,
  PriceRuleInput,
  type PricingContext,
  priceFromCost,
  priorPrice,
  repriceProduct,
  ruleFor,
  setVariantPrice,
  upsertPriceRule,
} from './pricing.ts';
export { type PriceRule, priceHistory, priceRules } from './schema.ts';