[Freeswitch-users] Mod_db deleting data from database

HI I am setting up the intercept feature, and I went through the wiki on how to accomplish it. The only question I have is once I inserted data on the db with <action application="db" data="insert/realm/key/value"/> how could I delete this data out of the db ? I see the <action application="db" data="delete/realm/key"/> will delete the record, is this the only options that I have to delete the record from the db ? If yes then how could I use it to delete the record when the call gets hangup? Do I have to have this action on every calls that get hangup? Thanks in advance.