Add `ConstraintKinds` for backwards compat
Add `ConstraintKinds` for backwards compat

rdnetto/persistent,yesodweb/persistent,naushadh/persistent,gbwey/persistent,rdnetto/persistent,bitemyapp/persistent,plow-technologies/persistent,paul-rouse/persistent,gbwey/persistent,gbwey/persistent,erikd/persistent,pseudonom/persistent,creichert/persistent,pseudonom/persistent,psibi/persistent