/etc/freeradius/3.0/mods-config/sql/counter/mysql/noresetcounter.conf is in freeradius-config 3.0.16+dfsg-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | query = "\
SELECT IFNULL(SUM(AcctSessionTime),0) \
FROM radacct \
WHERE UserName='%{${key}}'"
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