How to store last user activity data in Redis

Question

NoSQL

Hello!
How to store last user activity data in Redis?
Like "key_user_id" "time" or like a hash?
That is, with any action on the site, a record of the form "user id" - "time" is updated
thanks!

Answer 1

if you only need to know the time of the last activity, then store it like this:
the key users_last_activity:user_id is the value

Answer 2

And for what purpose do you actually need this functionality? To show the date the user was last active, or to show active users over a period?