Yesod is a Haskell web framework for productive development of type-safe, RESTful, high performance web applications. August 29, 2014By Greg WeberView source on Github We are happy to announce the release of persistent 2.0 persistent 2.0 adds a flexible key type and makes some breaking changes. 2.0 is an unstable release that we want your feedback on for the soon to follow stable 2.1 release. New