{
    "additionalProperties": false,
    "properties": {
        "grade": {
            "additionalProperties": false,
            "properties": {
                "deleted_at": {
                    "format": "date-time",
                    "type": [
                        "string",
                        "null"
                    ]
                },
                "lesson_id": {
                    "type": "string"
                },
                "mark": {
                    "type": "number"
                },
                "skill_id": {
                    "type": "number"
                },
                "student_id": {
                    "type": "number"
                }
            },
            "required": [
                "mark",
                "skill_id",
                "lesson_id",
                "student_id",
                "deleted_at"
            ]
        },
        "meta": {
            "additionalProperties": false,
            "properties": {
                "timestamp": {
                    "_format": "date-time",
                    "type": "string"
                }
            },
            "required": [
                "timestamp"
            ],
            "type": "object"
        }
    },
    "required": [
        "grade",
        "meta"
    ],
    "type": "object"
}