Integrate Persistent with Servant

Query my SQLite database from within my Servant handlers. Nothing I've written
is domain-specific to the business logic yet -- I'm just making sure everything
integrates.

src/Types.hs

@@ -0,0 +1,35 @@
+{-# LANGUAGE EmptyDataDecls #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TypeFamilies #-}
+--------------------------------------------------------------------------------
+module Types where
+--------------------------------------------------------------------------------
+import Data.Aeson
+import Data.Text
+import Database.Persist.TH
+--------------------------------------------------------------------------------
+
+share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
+User
+  name Text
+  age  Int
+  UniqueName name
+  deriving Eq Read Show
+|]
+
+instance FromJSON User where
+  parseJSON = withObject "User" $ \ v ->
+    User <$> v .: "name"
+         <*> v .: "age"
+
+instance ToJSON User where
+  toJSON (User name age) =
+    object [ "name" .= name
+           , "age"  .= age
+           ]