Add alternative input of username, password, host and db

[BrutalCSkakan]

Hello!
The current implementation requires me to write the full connection string to the postgresql database.
However, I have a password that contains characters like the starting parenthesis "(", this breaks the cmd as it expects me to also provide an end-parenthesis ")" before cmd actually executes the code.

I'd like a config file for my db connection rather than providing it in the cmd.

[mayfer]

yeah this makes sense. if anyone makes a pull request for it i'll approve