Proxy between database and Cucumber selenium tests

I have tests writen for my web app in Cucumber with Selenium. In these tests I need to connect with database (postgres) which is on some server. This is a problem in local development process because establishing connection takes time so every time I write some changes and want to run tests I need to wait more than 10 sec to connect to the database.

So I thought about some proxy that can be run once and then can serve connection to my local project.

Is this have any sense? Maybe there are tools for that? If not, maybe You know some blogs or tutorial for something like that? Prefered technologies: java, grails, nodejs.

Thanks in advance!