Auto cache clear or pruning

[coomcode]

Is your feature request related to a problem? Please describe.
if i want to use a server with 48 hour retention its all saved on mobile and i have to clear the cache manually often

Describe the solution you'd like
an option to automatically clear cache every X amount of days or remove stuff older than X amount of days

Describe alternatives you've considered
the only other options are using burn bot that needs permission to see messages

Additional context
thank you