Replaces MongoDB support with PostgreSQL (#151)

- All schemas have been rewritten to a relational model
- All services have been rewritten to accommodate the new data model
- Adds idempotency keys to core endpoints allowing you to retry requests with no additional side effects
- Adds staged jobs to avoid putting jobs in the queue when transactions abort
- Adds atomic transactions to all methods with access to the data layer

Co-authored-by: Oliver Windall Juhl <oliver@mrbltech.com>

packages/medusa/src/api/routes/admin/discounts/delete-dynamic-code.js

@@ -1,20 +1,15 @@
-import { MedusaError, Validator } from "medusa-core-utils"
-
 export default async (req, res) => {
   const { discount_id, code } = req.params
 
-  const { value, error } = schema.validate(req.body)
-  if (error) {
-    throw new MedusaError(MedusaError.Types.INVALID_DATA, error.details)
-  }
-
   try {
     const discountService = req.scope.resolve("discountService")
     await discountService.deleteDynamicCode(discount_id, code)
 
-    const data = await discountService.retrieve(dicsount_id)
+    const discount = await discountService.retrieve(discount_id, {
+      relations: ["rule", "rule.valid_for", "regions"],
+    })
 
-    res.status(200).json({ discount: data })
+    res.status(200).json({ discount })
   } catch (err) {
     throw err
   }