Useless Row in "statistical_answer" table

[sam98uele]

product_id row is useless in "_statisticalanswer" table! Because it must be connected only to "questionnaire_response", then it will have the corresponding product, but having it in the "statistical_answer" table is not correct!

We will discuss and modify it this night! Will need to:

• update the model
• and the entities

[alessandriniluca]

Also I was wondering that it could be wrong, but I could not remember exactly what we decided (indeed I put it, and it was one thing I wanted to mention tonight). I actually thought that we put it because ti could be useful in order to access directly answers about a product, without retrieving before every user who respond the questionnaire. Anyway tonight we will discuss it better and evaluate. Let's remember to have a look here at all the issues we pointed out during the deployment, we will face them better together