Hello,
It’s possible to update an item in a database collection using the wix-data API and update() specifically.
https://www.wix.com/corvid/reference/wix-data.html#update
The insert() might be helpful as well as it a dds an item to a collection.
https://www.wix.com/corvid/reference/wix-data.html#insert
If you are referring to something else, please elaborate on the issue and explain the exact actions you are trying to perform.