Thrawn reading the database.
The Inquisitorial database[1] was a databank created by the Inquisitorius which detailed information on remaining Jedi after Order 66. In the time of the New Republic, the records remained intact in the hands of the Imperial remnant.[2] Grand Admiral Thrawn read the database on a datapad on Ahsoka Tano to discover her master was Anakin Skywalker.[1]
Appearances
Star Wars: Ahsoka — "Part Seven: Dreams and Madness" (First appearance)
Sources
Inquisitorial Database in the Databank (backup link)