Hide/Delete keepusaliveuser in radpostauth table

[Sylvain De Muynck]

Dear all, 
I need to get a keepalive user for my NAS to be authenticated every minutes. 
Also, for monitoring purpose, I am using this table to check which user get authenticated.
Is there a specific way to delete automatically or to say to the Radius server not to add this particular user in the database? 
In fact, I am authenticated this user every minutes so this table is not significant anymore.
Thanks for your reply,
Sylvain
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