A partial fork of Lars Petersen's HiggsSet. Unless you're looking for one of the very specific advantages I'm going for here, you're probably better off looking at HiggsSet.

JaggedSet is a multi-index set for sum types desgined to enforce relations on update. You put all of your data in one sum type and then use constructor-specific instances to map related fields onto shared indexes in a JaggedSet. Every record now stores every field related to a given constructor so you don't need to JOIN on every request. Furthermore: when you update an index, you also update its value in every record it points to, enforcing relations between constructors in a simple fashion.

As you may have guessed, this strategy is most beneficial for highly read-biased workloads. Furthermore, types of index values are limited - currently to bytestrings and ints.