{
    "additionalProperties": false,
    "properties": {
        "grades": {
            "items": {
                "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"
                ],
                "type": "object"
            },
            "type": "array"
        },
        "meta": {
            "additionalProperties": false,
            "properties": {
                "timestamp": {
                    "_format": "date-time",
                    "type": "string"
                }
            },
            "required": [
                "timestamp"
            ],
            "type": "object"
        }
    },
    "required": [
        "grades",
        "meta"
    ],
    "type": "object"
}