When you click on a DB name, then in the contextual menu, you select 'Empty', it actually executes a DROP on all tables…. so your data AND structure is lost…
it has just happened to me. 🙁 so this should be fix so that it doesn't happen to others….
That's what is supposed to happen when you click on a DB name and select empty. It empties the DB. It's not designed to simply truncate all the tables. (Althought that would be a cool feature to add.)