The node 'content' has the attributes 'lastValidatedAt', 'lastModifiedAt' and 'createdAt' but not the 'firstValidatedAt'.

On FO, it may be required to display the 'Online from' date (means the first time visible on FO = first validation), and the 'last modification' date (means latest validation).

At the same time, instead of the user's login in lastcontributor and creator, the full name would be better. Then we can display on FO:

Created by 'creator' the 'first validation date'
Last modification by 'lastmodificator' the 'last validation date'