Hello
I think it would be a good idea to automaticly delete all app-data after a preset amount of time. Lets say you didn’t use BW for one week and the app resets itself. Like this someone who found/stole your phone has less chance to access your data.
Another thought is to delete BW after five attempts to unlock BW and/or the Android lockscreen.
I look forward to hear that you think of my ideas.