class Model extends ManagedObject<_Model> implements _Model {
  @override
  void willInsert() {
    createdAt = DateTime.now().toUtc();
  }
}

class _Model {
  @primaryKey
  int id;

  @Column(indexed: true)
  String name;

  DateTime createdAt;

  @Column(nullable: true)
  String _myPrivateField;
}

"components": {
        "schemas": {
            "Model": {
                "title": "Model",
                "type": "object",
                "properties": {
                    "id": {
                        "title": "id",
                        "type": "integer",
                        "description": "This is the primary identifier for this object.\n",
                        "nullable": false
                    },
                    "name": {
                        "title": "name",
                        "type": "string",
                        "nullable": false
                    },
                    "createdAt": {
                        "title": "createdAt",
                        "type": "string",
                        "format": "date-time",
                        "nullable": false
                    },
                    "_myPrivateField": {
                        "title": "_myPrivateField",
                        "type": "string",
                        "nullable": true
                    }
                },
                "description": ""
            }
        },