self.posts = columns(

            # identification
            'id',
            'user_id',

            # user defined
            'symptom_id',

            # phone
            'time',
            'location',

            # outside
            'temperature',
            'pressure',
            'humidity',
            'wind',

            # inside
            'in_temperature',
            'in_humidity',
            'in_dust',
            'in_noise',

            # wearable
            'fitness',
            'pulse',
            'sleep',
        )