This SQL statement is executed whenever a user session
finishes (i.e. when an Accounting-Request Stop message is received). It is
expected to remove the details of the session from the SQL database.
Special formatting characters may be used. %1 by the NAS IP address, %2 by
the NAS-Port, %3 by the SQL quoted Acct-Session-Id and %4 by the
Framed-IP-Address. If DeleteQuery is defined as an empty string, then the
query will not be executed.
Delete is executed by default when an
Access-Request message is received or a new session is added. This
attempts to clear any defunct existing session for the port. If the port
is not unique for a session, or there's some other reason to control
session database updates, see
SessionDatabaseOptions.
It defaults to:
delete from RADONLINE where NASIDENTIFIER='%1' and NASPORT=0%2