User-Related Device Fields:

The MI_USER table stores the set of user-related device fields. The Reporting Database further separates these fields into common user fields that are stored in this table and LDAP fields that are stored in the MI_USER_LDAP_ATTR and MI_USER_LDAP_GROUP tables.

It has one to one relationship with the MI_DEVICE table, that is, if a user owns three devices, all three devices are stored in the MI_DEVICE table and the user record is stored three times in this MI_USER table, each with a different "device_id" value, but the same values for the other fields.