fix(order): Add composite unique index on order_item version:item_id

[NicolasGorga]

Summary

What — What changes are introduced in this PR?

Adds a unique constraint to order_item table to prevent a given order_line_item from having duplicates for a given version.

Why — Why are these changes relevant or necessary?

There is no constraint at the DB level to enforce this atm.

How — How have these changes been implemented?

Added a composite unique index for order_item table on version:item_id fields.

Testing — How have these changes been tested, or how can the reviewer test the feature?

Run migrations successfully.

---

Examples

Provide examples or code snippets that demonstrate how this feature works, or how it can be used in practice.
This helps with documentation and ensures maintainers can quickly understand and verify the change.

// Example usage

---

Checklist

Please ensure the following before requesting a review:

• I have added a changeset for this PR
  • Every non-breaking change should be marked as a patch
  • To add a changeset, run yarn changeset and follow the prompts
• The changes are covered by relevant tests
• I have verified the code works as intended locally
• I have linked the related issue(s) if applicable

---

Additional Context

We already prevented generating this situation when executing markOrderFulfillmentAsDeliveredWorkflow with this PR. The intention here is to now also enforce this at the DB level, relevant to custom workflows and any other workflow impacting the order_item table.

Closes CORE-1297

[changeset-bot]

🦋 Changeset detected

Latest commit: e690a28

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 74 packages

Name	Type
@medusajs/order	Major
@medusajs/medusa	Major
@medusajs/test-utils	Major
@medusajs/medusa-oas-cli	Major
integration-tests-http	Patch
@medusajs/analytics	Major
@medusajs/api-key	Major
@medusajs/auth	Major
@medusajs/caching	Major
@medusajs/cart	Major
@medusajs/currency	Major
@medusajs/customer	Major
@medusajs/file	Major
@medusajs/fulfillment	Major
@medusajs/index	Major
@medusajs/inventory	Major
@medusajs/link-modules	Major
@medusajs/locking	Major
@medusajs/notification	Major
@medusajs/payment	Major
@medusajs/pricing	Major
@medusajs/product	Major
@medusajs/promotion	Major
@medusajs/region	Major
@medusajs/sales-channel	Major
@medusajs/settings	Major
@medusajs/stock-location	Major
@medusajs/store	Major
@medusajs/tax	Major
@medusajs/user	Major
@medusajs/workflow-engine-inmemory	Major
@medusajs/workflow-engine-redis	Major
@medusajs/draft-order	Major
@medusajs/oas-github-ci	Major
@medusajs/cache-inmemory	Major
@medusajs/cache-redis	Major
@medusajs/event-bus-local	Major
@medusajs/event-bus-redis	Major
@medusajs/analytics-local	Major
@medusajs/analytics-posthog	Major
@medusajs/auth-emailpass	Major
@medusajs/auth-github	Major
@medusajs/auth-google	Major
@medusajs/caching-redis	Major
@medusajs/file-local	Major
@medusajs/file-s3	Major
@medusajs/fulfillment-manual	Major
@medusajs/locking-postgres	Major
@medusajs/locking-redis	Major
@medusajs/notification-local	Major
@medusajs/notification-sendgrid	Major
@medusajs/payment-stripe	Major
@medusajs/core-flows	Major
@medusajs/framework	Major
@medusajs/js-sdk	Major
@medusajs/modules-sdk	Major
@medusajs/orchestration	Major
@medusajs/types	Major
@medusajs/utils	Major
@medusajs/workflows-sdk	Major
@medusajs/cli	Major
@medusajs/deps	Major
@medusajs/telemetry	Major
@medusajs/admin-bundler	Major
@medusajs/admin-sdk	Major
@medusajs/admin-shared	Major
@medusajs/admin-vite-plugin	Major
@medusajs/dashboard	Major
@medusajs/icons	Major
@medusajs/toolbox	Major
@medusajs/ui-preset	Major
create-medusa-app	Major
medusa-dev-cli	Major
@medusajs/ui	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

8 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
api-reference	Ignored			Nov 30, 2025 6:57pm
api-reference-v2	Ignored			Nov 30, 2025 6:57pm
cloud-docs	Ignored			Nov 30, 2025 6:57pm
docs-ui	Ignored			Nov 30, 2025 6:57pm
docs-v2	Ignored			Nov 30, 2025 6:57pm
medusa-docs	Ignored			Nov 30, 2025 6:57pm
resources-docs	Ignored			Nov 30, 2025 6:57pm
user-guide	Ignored			Nov 30, 2025 6:57pm