they provide crud functionality on data using the UI when logged in as an admin
Right.
But is it possible to just use, for example, adding data and disable the other features?
I guess yes, but there is no single approach here. Each library will solve this in different ways. They give you CRUD, but it's up to you how to implement ACL
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Right.
I guess yes, but there is no single approach here. Each library will solve this in different ways. They give you CRUD, but it's up to you how to implement ACL