Sounds like it might be database or implementation-specific. From quick Googling I found https://groups.google.com/d/msg/vault-tool/6jhwtqkfpA8/IK2_H... and http://stackoverflow.com/questions/38579168/spring-boot-jdbc... -- see also, periodic tokens: https://github.com/hashicorp/vault/blob/master/website/sourc...

I look forward to other answers though, if anyone's currently set this up. I haven't used it yet myself, but I've been considering it.