hehe cool.
pls make a backup from the file, before you use the sql ;-)
cp /home/user/.rtcom-eventlogger/el-v1.db /home/user/.rtcom-eventlogger/el-v1-backup.db

to delete all sent sms, run this command in the "execute SQL" tab:
delete from events where event_type_id = 7 and outgoing = 1

and yes just by
cp /home/user/MyDocs/el-v1.db /home/user/.rtcom-eventlogger/el-v1.db
you can overwrite the old database with your new one