toJson method
Implementation
Map<String, dynamic> toJson() => {
'pageName': pageName,
'enterTime': enterTime?.toIso8601String(),
'exitTime': exitTime?.toIso8601String(),
'stayDurationMs': stayDuration?.inMilliseconds,
'loadTimeMs': loadTime?.inMilliseconds,
'isActive': exitTime == null,
};