Thanks for your post! Currently, there isn’t a report that can gather this, and you would just need to review this directly within the user management area under Administration > Users & Roles. With TestRail Server, you may be able to use some queries to gather this data (e.g. such as last login time, project access details, etc), however this wouldn’t be available for TestRail Cloud. That said, we do have plans to look into adding support for more details user audit logs, and I’ve added another vote to this feature request.
Please note that accessing the TestRail database should be in a read-only capacity only, as any modifications to the database can lead to data inconsistency which would result in an unsupported database.