I think we might need to add both a timeout and max entry specification here. I need to dig a bit more into the django docs to confirm but we need to make sure the cached log files do not persist indefinitely and we set some kind of maximum limit on how many we cache. This looks promising:
```
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
        'LOCATION': '/var/tmp/django_cache',
        'TIMEOUT': 60,
        'OPTIONS': {
            'MAX_ENTRIES': 1000
        }
    }
}
```
https://docs.djangoproject.com/en/dev/topics/cache/#cache-arguments

Not sure if the ``filesystem`` property will take the same arguments but I would suspect it would.