curl --request POST \
  --url https://app.solya.app/api/supplier-variant-constraints \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "moq": 12,
  "packMultiple": null,
  "supplierId": "supplier-uuid-123",
  "variantId": "variant-uuid-abc"
}
'

{
  "createdAt": "2026-06-05T10:00:00.000Z",
  "id": "constraint-uuid-new",
  "moq": 12,
  "packMultiple": null,
  "supplierId": "supplier-uuid-123",
  "updatedAt": null,
  "variantId": "variant-uuid-abc"
}