The Issue: The Admin dashboard was reporting a 7-minute offset for "Last Seen" heartbeat status, even when traffic was live.
The Fix: Discovered a local NTP sync drift on the development domain controller. Standardized all dashboard status calculations to use strict UTC (current_time('timestamp', true)), removing reliance on local system clocks. - Maintenance performed by Matthew Colley, Lead Engineer.
The Lesson: This reinforces why AdGuardian uses server-side validation; local system clocks (and browser clocks) are too prone to drift to be used for security-critical data.