{
  "type": "object",
  "required": [
    "id",
    "title",
    "description",
    "author",
    "state",
    "iid",
    "confidential",
    "created_at",
    "due_date"
  ],
  "properties": {
    "id": { "type": "integer" },
    "title": { "type": "string" },
    "description": { "type": ["string", "null"] },
    "state": { "type": "string" },
    "iid": { "type": "integer" },
    "confidential": { "type": "boolean" },
    "created_at": { "type": "date" },
    "due_date": { "type": ["date", "null"] }
  },
  "additionalProperties": false
}