I am not sure, how you're trying to access data but if it's generic.

You can access tables mapped to the classes.

Refer similar posts,

https://pdn.pega.com/community/pega-product-support/question/how-access -db-schema-prpc-personal-edition-72

Hope it helps.

Hi 

Could you try using "postgres" as user name. And let me know if you still facing an issue.

Regards

Krishna

Enter username as postgres and password as postgres and check.