/etc/freeradius/3.0/mods-config/sql/ippool/ is in freeradius-config 3.0.12+dfsg-5+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/mysql/
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/mysql/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/mysql/schema.sql
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/oracle/
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/oracle/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/oracle/schema.sql
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/sqlite/
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/sqlite/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool-dhcp/sqlite/schema.sql
/etc/freeradius/3.0/mods-config/sql/ippool/mysql/
/etc/freeradius/3.0/mods-config/sql/ippool/mysql/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool/mysql/schema.sql
/etc/freeradius/3.0/mods-config/sql/ippool/oracle/
/etc/freeradius/3.0/mods-config/sql/ippool/oracle/procedures.sql
/etc/freeradius/3.0/mods-config/sql/ippool/oracle/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool/oracle/schema.sql
/etc/freeradius/3.0/mods-config/sql/ippool/postgresql/
/etc/freeradius/3.0/mods-config/sql/ippool/postgresql/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool/postgresql/schema.sql
/etc/freeradius/3.0/mods-config/sql/ippool/sqlite/
/etc/freeradius/3.0/mods-config/sql/ippool/sqlite/queries.conf
/etc/freeradius/3.0/mods-config/sql/ippool/sqlite/schema.sql