Help understanding xf_session and xf_session_activity

I want to build an addon to query the xf_session / xf_session_activity tables and determine whether any users with shared IPs to the current user have visited this user's profile page or interacted with any of this user's content. This is in an attempt to help identify duplicate accounts of banned or problematic users.

For example, banned users will often return to the website, create a new account, and then visit their old profile. I guess they want to "see" if they are still banned...

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