I am coming across an underscore hd ( _hd ) object in my instance, Ive not noticed this before?
I have a custom object called Membershi__c
I also see the following to additional objects
The History object I know is for file history tracking.
Does anyone know what the _hd object is, it is not query-able, I see it in the developer console object list
The _hd suffix stands in for ‘Historical Data’. When Historical Trending is set up for an object, the customobject__c_hd will show up in the Developer Console. There isn’t much in the way of documentation on how Salesforce is handling this on the backend that I can find, just the Setup and Reporting documentation linked above.