The Database Maintenance area shows all of the devices that have reporting data stored in HPCA. Use the Maintenance toolbar to clean up reporting data for devices that may no longer be in your database.
To remove device reporting data:
After reporting data is removed for a device, the data is not available when generating any reports.
Note: If you are deleting reporting data for an actively managed device, to avoid reporting data discrepancies, you should remove then re-deploy the Management Agent on that device.