schema.json

{
    "forms": [
        {
            "name": "device",
            "repeating": false,
            "fields": [
                {
                    "name": "device_type",
                    "settings": [
                        {"element_type": "select"}
                    ]
                },
                {
                    "name":"device_suspension_date",
                    "settings": [
                        {"element_type": "text"},
                        {"element_validation_type": "date_dmy"}
                    ]

                },
                {
                    "name": "device_registration_date",
                    "settings": [
                        {"element_type": "text"},
                        {"element_validation_type": "date_dmy"}
                    ]
                }
            ]

        },
        {
            "name": "sessions",
            "repeating": true,
            "fields": [                    
                {
                    "name": "session_tracking_id",
                    "settings": [
                        {"element_type": "text"}
                    ]
                },
                {
                    "name": "session_owner_id",
                    "settings": [
                        {"element_type": "text"}
                    ]
                },
                {
                    "name": "session_event_id",
                    "settings": [
                        {"element_type": "text"}
                    ]
                },
                {
                    "name": "session_project_id",
                    "settings": [
                        {"element_type": "text"}
                    ]
                },
                {
                    "name": "session_device_state",
                    "settings": [
                        {"element_type": "radio"},
                        {"element_enum": "0, available \\n 1, unavailable \\n 2, maintained"}
                    ]
                },
                {
                    "name": "session_assign_date",
                    "settings": [
                        {"element_type": "text"},
                        {"element_validation_type": "datetime_seconds_ymd"}
                    ]
                },
                {
                    "name": "session_return_date",
                    "settings": [
                        {"element_type": "text"},
                        {"element_validation_type": "datetime_seconds_ymd"}
                    ]
                },
                {
                    "name": "session_reset_date",
                    "settings": [
                        {"element_type": "text"},
                        {"element_validation_type": "datetime_seconds_ymd"}
                    ]
                }
            ]
        }
    ]
}