Add a pywikibot.User method to find the last activity:

e.g.

def last_activity(self) -> pywikibot.Timestamp:

or

def inactive(self, days: int) -> bool:

and find the last activitity using

• User.last_edit
• User.deleted_contributions()
• User.logevents
• refer abuselog (API:Abuselog) there is no implementation yet

Use case(s):
Find inactive IP users to cleanup discussion pages, tag inactive templates to user/user talk pages etc.

Benefits:
Find inactive users for a given time delta