you may be looking for quite a while as far as i am aware, there is no plantery record keeper on dath,
I know there is one on tat and dantand maybe one of the other planets,
These were put in when quests / rewards were changes so people that hade already done the quests could repeat the quests.
As nothing has changed on dath only added to, i dotn think one was ever set up on the planet.
Although i maybe wrong, but im sure i read another post asking the same question, and im sure it recieved the same answer.