Do I lose my thumbs up/down training when Events are deleted?

No, your training data continues to influence the learning models of your cameras even after your video history has been deleted. If instead you specifically want to forget your prior training data, then you can give your cameras amnesia (camnesia ;)).

1. Open the camio.com/learning page.
2. Enter the date of the earliest training memory to be retained.
3. Press the Save button.

If you accidentally enter an incorrect date, then you can Clear the incorrect date and press Save again.