nix build, builds scaffolding succesfully

config/models.persistentmodels

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+-- By default this file is used by `persistFileWith` in Model.hs (which is imported by Foundation.hs)
+-- Syntax for this file here: https://github.com/yesodweb/persistent/blob/master/docs/Persistent-entity-syntax.md
+
+User
+    ident Text
+    password Text Maybe
+    UniqueUser ident
+    deriving Typeable
+Email
+    email Text
+    userId UserId Maybe
+    verkey Text Maybe
+    UniqueEmail email
+Comment json -- Adding "json" causes ToJSON and FromJSON instances to be derived.
+    message Text
+    userId UserId Maybe
+    deriving Eq
+    deriving Show