WORKAROUND:
1. Stop Dell-UCCS-Analytics-Data-Engine service
2. Backup "Dell.UC.Insights.DataEngine.DataModel.dll" from $\Dell\UCCS Analytics\Data Engine to some other location.
3. Replace "Dell.UC.Insights.DataEngine.DataModel.dll" in $\Dell\UCCS Analytics\Data Engine with the one attached
4. Start Dell-UCCS-Analytics-Data-Engine service.
5. Refresh the website, check the insights and let us know the results.
STATUS:
Issue resolved in Hotfix.