Do you want your Google form responses directly into your database in Postgre SQL?
Yes, it can be achieved through AppiWorks for Google Forms.
AppiWorks is an add-on for Google Forms to enable interactions with external applications.
Just do simple 3 step to set up:
Service Configuration: Choose an application, establish connection, and
select the action that you want to perform on form submission.
Mapping: Map form fields with corresponding app fields to ensure correct entry of data into your application.
Notification (optional): Get notified via Google Chat, Email etc., on successful entry in your application.