While not having exactly the same problem, I figured it couldn't hurt to try this. All the steps to DB_Recover went fine with similar output to yours. No benefit to my mother's touchpad's problem. Yes, I even reset after running it.
The email app has been forgetting her account regularly. It would still be listed as an account, but would not be set to default account and could not be without adding a new account or resetting. Resetting worked, at first, but would forget again the next day. Now the problem is worse. It is now impossible to erase emails and the the touchpad does not appear to be receiving new emails correctly either. Even the trash cannot be emptied. Nothing happens at all when you empty it. You can swipe to delete, but when you look again the message is still there despite having briefly disappeared when you swiped.
Also, her kindle app frequently fails to display anything on the screen when she uses it without a reboot.
because it was suggested, I checked and /var is not full
Looking at Lumberjack I see a lot of RenderRow errors for email.
I did install android, but that was only after the touchpad was doing the account forgetting. It is probably not releted.
"Cannot call method 'renderRow' of undefined
"Cannot call method 'render' of undefined
also Resource Load Cancelled
WebView error 1000
I think those are just from the email app themselves, however rather than the problem.
Update: I did get one new email on the touchpad after the db recover. I was able to delete that email and remove it from trash. However, emails that were on there before the db recover cannot be deleted or even moved to trash, which cannot be emptied.
After sending a test email to the touchpad, I can delete that to trash, but empty trash will not remove the email. Manually deleting the email in trash, did work, but as before, no other email can be deleted.