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Really appreciate your help, you all bend over backwards to help us getting to grips with Wix Code. You have gold in your hands, it´s a very powerful tool. If you could just provide more documentation, maybe a thick book or something, with real projects and online code examples.
I believe it has been said before, but it looks like most users, me included, are simply not proficient enough in the concepts and syntax of server side Javascript in combination with the design decisions you had to make.
In my case, I understand perfectly what should be done, why it should be done this way and not that, but it is the physical coding that is the big hurdle. I have extensive experience with IIS, MS-SQL server and ASP-script, others might know a thing or two about PHP and MySql, but getting to grips with the new concepts of SS JS (why do we need to export functions inside our own code if no other app imports them …, (oh, wait, maybe there is …)), asynchronous functions and promises, it´s overwhelming.
We also lack insight in problems that we know from experience, but are not addressed, like Transaction Tracking (Commit, RollBack), especially when you are about to introduce Master/Detail structures.

In short: you have a jewel in your hands, but your audience couldn’t tell the difference between a diamond and a sapphire. You do not come from the coding community, you come from the Design-Your-Own-Beautiful-Webpage angle. And this audience needs help, a lot of help. You do your utmost best to offer this thru the forum and you sometimes write the whole function for us. That is of course appreciated, but if you could just provide us with good documentation, we wouldn´t have to bother you so much with our silly questions that make your eyes roll.

I, for now, will put the coding on halt, I simply don´t have the time to write a question for every line of code (after having searched thru all examples and API). I will try to contract somebody else. THat doesn´t mean I dump Wix Code, again, you are sitting on a pot of gold, but I will wait for the roadmap, preferably a 1000 pages long.
I sincerely congratulate you with the end result of your tremendous project.