Thank you very much for answering.
I'm new to osticket...for now in my role as administrator and trainer of end users.
But I can also help from the programming side if I could have access to the documentation in the development environment.
For example, I don't know what the persistence of custom aggregate fields looks like... nor of the (I imagine) classes and methods defined for their manipulation.
Do you know where I can find more info? for now I plan to see the ERD published in the documentation for developers...