{
  "type": "object",
  "required": [
    "id",
    "name",
    "description",
    "created_at"
  ],
  "properties": {
    "id": { "type": "integer" },
    "name": { "type": "string" },
    "description": { "type": ["string", "null"] },
    "created_at": { "type": "date" }
  },
  "additionalProperties": false
}