Mongo DB issue/audit - Running on a Python / Flutter App

Hello - i have an app and the Mongo DB has deleted a stored section that users complete and stays on their account. I wanted someone to take a look at this to see if it can be restored, and then to see how we prevent this from happening again in the future. If the server needs upgrading or any changes need to be made to the database infrastructure.

I also want a default checklist installed for every new account.