I appreciate it’s not Wappler related and is not an issue specific to Wappler, but it may not be obvious to or expected by new Wappler users who have just used PHP to connect their databases before for example. I think people are usually surprised to realise the data is accessible in the way it is.
By default, creating a new query in query builder creates a SELECT * query - ie by default all of the data is included whether you intend to display it or not. I expect new users tend to accept defaults without realising the implications. Of course you don’t want to alarm people, but I think perhaps there should be some information about this somewhere - docs or query builder.