log file will be overwrite when use prefork?

below is the logging config in setting.py.  only the newest logs in the output file.. It seems the log file is overwrite when new process been forked 

LOGGING = {

    'version': 1,

    'disable_existing_loggers': False,

    'formatters': {

        'standard': {

            'format': '%(levelname)s %(asctime)s %(module)s %(lineno)d %(message)s'

        },

        'detail': {

            'format': '%(levelname)s %(asctime)s %(pathname)s %(lineno)d %(message)s'

        }

    },

    'handlers': {

        'frontend': {

            'level': 'INFO',

            'formatter': "standard",

            'class': 'logging.handlers.TimedRotatingFileHandler',

            'when': 'MIDNIGHT',

            'filename': '/deploy/logs/log.txt'

        },

        'error': {

            'level': 'INFO',

            'formatter': "detail",

            'class': 'logging.handlers.TimedRotatingFileHandler',

            'when': 'MIDNIGHT',

            'filename': '/deploy/logs/error.txt'

        },

        'stat': {

            'level': 'INFO',

            'formatter': "standard",

            'class': 'logging.handlers.TimedRotatingFileHandler',

            'when': 'MIDNIGHT',

            'filename': '/deploy/logs/stat.txt'

        }

    },

    'loggers': {

        'frontend': {

            'handlers': ['frontend'],

            'level': 'INFO',

            'propagate': True,

            },

        'error': {

            'handlers': ['error'],

            'level': 'INFO',

            'propagate': True,

            },

        'stat': {

            'handlers': ['stat'],

            'level': 'INFO',

            'propagate': True,

            },

        }

}

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