Can't delete entries in a Ketai SQLite database

Hello,

I'm working on some Android app in which I'm using a Ketai SQLite database. Basically that's working nicely but I'm stuck on a problem which is really driving me nuts: I cannot delete my entries using a DELETE query:

boolean success = db.query("DELETE FROM my_table");
if (success) {
    println("done deleting");
}

... I'm getting the success message but in my app I can see nothing has been deleted.

What's wrong with my approach? Or is this maybe a bug? Any ideas?

Thanks, Stefan