YNAB: How Compact Database
How to contact the database in YNAB4:
This will remove all devices except for the computer being used. This device will be assigned to ‘A’, and then I can add all my other devices again. This is useful, because everytime I flash a new ROM on my phone and add YNAB to it, it adds a new device. YNAB will only let you add up to 26 devices (letters A – Z).