With Velo code, is it possible to add new fields (including text) to items in a database?

[CODE-NINJA]

No this is surely not what you want!!!

Better way → using either…

a) ARRAY-FIELDS
…or even better, using…
b) OBJECT-FIELDS

This way you can store for each of ROW (LINE) all messages related to a USER.

You surely don’t want to create an infinite DATABASE creating infinite COLUMNS!!!

Your issue has a lot of similarity to the following…

Creating a Questionnaire with repeater, images, and checkboxes/radio buttons

Yes —> OBJECT into an ARRAY !!! CORRECT! RESULT → OBJECT-ARRAY —> [{data:‘tt’},{data:‘ff’},{data:‘dd’},{data:‘aa’}] But the same way you can put the ARRAY again into an OBJECT, You can do this infinite. Also works vice versa. → Will depend on your data and how you want to store it inside database. As i already said, you first have to structure your database, before you start to code. Make clear → how your database will look like at the end.

At the end you also can create a second database → for MESSAGES <— and include them in your QUERY…

https://www.wix.com/velo/reference/wix-data/wixdataquery/include