curl --request POST \
  --url http://localhost:3917/item/define \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "name": "Health Potion",
  "properties": {
    "cost": 50,
    "heal": 150
  }
}
'

{
  "ok": true,
  "message": "<string>"
}