Dont connect back-end Nodejs on my database MySQL.

Hello guys. I have one application Nodejs deployed in railway. My application backend it works, but i dont connect in database. There is a tutorial for connection between database and backend ? I'm testing with insomnia from url generated in deploy.

8b93b6fe-4889-4be3-accc-59a198edd485

This is my variables

this will help you
https://docs.railway.app/troubleshoot/fixing-common-errors