Best Practice clarification adding extra fields to Users table

Database & APIs

I want to track credits for users.

https://docs.flutterflow.io/data-and-backend/firebase/authentication/initial-setup says "To store and collect additional information with the default fields, see how to add fields." so I added this as an extra field in the Users collection

However now I notice in FlutterFlow Firestore Data Manager there is a warning that says: "Warning this is your users table that we automatically populate for you. we do not recommend modifying this table manually" Does this mean it is not recommended to manually edit information for existing users or that it is not recommended to add fields to the schema either? If the latter, why e.g. might FlutterFlow override my schema etc? I expect this is ok per the article but I do not want to encounter surprises later on so looking to confirm.

What have you tried so far?

Searched in FF community and online.

Did you check FlutterFlow's Documentation for this topic?
Yes
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