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This (draft) PR adds a
Memo
trait and a first draft of an implementation of theMemo
trait via the backed ORM-mapped database.We use associated types to allow the implementor to define what the types they want to represent each concept.
There are a few todos still that I can't resolve myself, like how to add the children of both types of expressions into the ORM, since if you just have a JSON you can't figure it out on your own (unless you write something that is dependent on the variant tag).
Additionally, there are a few places where I arbitrarily choose to get IDs for a group or expression versus the entire tuple / record. I just chose what was easiest via the ORM, that can be easily changed if we need to.