Need to integrate Postman with Postgre DB

we are trying to validate the Response from the Postman against DB values from Postgre DB. we are looking for open source middle ware which can be used for this. I have browsed through here and am not able to find anything conclusive. Any help would be appreciated.

Hi,

I did a while back a tutorial on how to do this:

Maybe this helps.

I think their approach to open source might have changed in the meanwhile, but originally this was an open source product. https://www.dreamfactory.com/downloads/