This reports the exact date and time of a specific historical switchover event recorded in this table's row, the historical, per-row counterpart to carLastSwitchOverTime which only tracks the single most recent event. Having this per-row timestamp lets an admin build a full timeline of every switchover this HA pair has experienced, not just the latest one, useful for spotting patterns like recurring failures at a particular time of day. For example, an admin noticing several history rows with event times clustered around the same hour each day might suspect a scheduled process or environmental factor (like a nightly backup job) is triggering the switchovers.