usage: accounting report [-f] : prints accounting report in JSON, data is served from cache if possible
-f : forces a synchronous report instead of using the cache (only use this if the cached data is too old)
accounting config -e [<expired>] -i [<invalid>] : configure caching behaviour
-e : expiry time in minutes, after this time frame asynchronous update happens, default is 10 minutes
-i : invalidity time in minutes, after this time frame synchronous update happens, must be greater than expiry time, default is never