Is your feature request related to a problem? Please describe.
There aren't currently any system to protect fetchers (which will focus on 3rd part code) from overloading. Of course, that is a good idea to block end-user from spamming commands to overload fetcher but that will be a good idea to store cache somewhere to protect fetchers from any internal overloads caused by bot's core.

Describe the solution you'd like
That might be a good idea to store cache for about 30 minutes inside a variable or Redis