Users connecting Statement

Hi All,
To manage users, we created user group to which we granted rights,
given the growing number of users, I expect better user management.
How to get a detailed connection statement over a period given
according to all users. I have not set up a program in the capture
tracker to track users. I do not find options in the DHIS2 to improve
that management. Are there a sql exists? or something else ?
All suggestions are welcome

Best Regards
Pepe Ken Mvulu