user manager database

hi

i have a hotspot (60users) with 2 rb 433l and 1 493g. i am using the usermanager in 493g for all 3 devices.
i would like to ask you because i see database size is 19865.0 Kib and in use from first week is 73%. but i also see the free space in my routerboard is 83.1 mb.

whats gonna happed if database in use reach 100%? do i have to do anything?
can i change the size of the database?

could you please help me?

Regards
dat.jpg
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nobody knows?

please help me

Put Usermanager on to a x86 machine with a bigger hdd.