Local memory storage is the quickest and easiest session back end to set up, as it has no external dependencies whatsoever. It has the following significant drawbacks:
No shared storage across processes or workers.
No persistence after a process terminates.
The local memory back end is enabled as the default for Horizon solely because it has no dependencies. It is not recommended for production use, or even for serious development work. Enabled by:
SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
CACHES = {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
}