Feature Request: Emit events for price list price changes (price.created, price.updated)

[milewskibogumil]

Is your feature request related to a problem?

Yes. I'm implementing EU Omnibus Directive compliance for a Polish B2B e-commerce store. This directive requires displaying the lowest price from the last 30 days whenever a product is on sale or has a promotional price.

To achieve this, I need to track all price changes in real-time and store them in a price history table. The problem is:

Price list price changes do not emit any events, making it impossible to track them in real-time without:

• Overriding admin API routes (risky, fragile)
• Using database triggers (bypasses application layer)
• Polling the database periodically (not ideal)

Current behavior

When prices are created/updated in a price list via batchPriceListPricesWorkflow:

• ❌ No events are emitted (price.created, price.updated, etc.)
• ❌ No workflow hooks are exposed (pricesCreated, pricesUpdated)
• ✅ Regular product variant prices emit product-variant.created/updated (this works!)

This creates an asymmetry where regular prices can be tracked via events, but price list prices cannot.

Expected behavior

When prices in a price list are created, updated, or deleted, Medusa should emit events like:

// Events emitted by batchPriceListPricesWorkflow
"price-list.prices.created"  // { price_list_id, prices: [...] }
"price-list.prices.updated"  // { price_list_id, prices: [...] }
"price-list.prices.deleted"  // { price_list_id, price_ids: [...] }

OR expose workflow hooks:

batchPriceListPricesWorkflow.hooks.pricesCreated
batchPriceListPricesWorkflow.hooks.pricesUpdated
createPriceListPricesWorkflow.hooks.pricesCreated
updatePriceListPricesWorkflow.hooks.pricesUpdated

Use cases

1. EU Omnibus Directive - Track price history to show lowest 30-day price (required by law in EU)
2. Price change notifications - Alert customers when prices drop
3. Analytics & reporting - Track price changes over time
4. Audit trails - Compliance and business intelligence
5. Third-party sync - Sync price changes to external systems (ERP, marketplaces)

Workarounds attempted

Approach	Issue
Override /admin/price-lists/:id/prices/batch route	Fragile, hard to map prices to variants via links
Subscribe to product-variant.updated	Only works for regular prices, not price list prices
Use workflow hooks	batchPriceListPricesWorkflow has empty .hooks property
Database triggers	Bypasses application layer, not recommended
Periodic polling	Works but not real-time

Suggested implementation

The simplest solution would be adding emitEventStep to the price list workflows:

// In batchPriceListPricesWorkflow
emitEventStep({
  eventName: "price-list.prices.updated",
  data: {
    price_list_id: input.data.id,
    created: result.created,
    updated: result.updated,
    deleted: result.deleted,
  },
})

Alternatively, expose hooks similar to createProductsWorkflow.hooks.productsCreated.

Environment

• Medusa version: 2.11.3
• Node version: >=20

Additional context

The EU Omnibus Directive affects millions of e-commerce stores in Europe. Having built-in support for tracking price changes would make Medusa more attractive for EU-based businesses that need to comply with this regulation.