Thank you so much for your feedback!
About the issues:
1. I'll try to learn how dark theme works and how it is connected to my app. I'll try to turn off the interaction, or make the dark mode interaction better and add the ability to switch between 'Light Theme' and 'Dark Theme'.
2. The database is currently read-only and is not related to the buttons.
3. You are right, for some reason, when updating/deleting a password that doesn't exist it doesn't return an error.
I'll add the option to directly save a password from the generator screen. I'll make sure that all the passwords are hidden at first, maybe even set a lock that when pressed unlocks the passwords for a few minutes.