diff --git a/src/Handler/Sheet.hs b/src/Handler/Sheet.hs
index dfcb16d90..d59de841d 100644
--- a/src/Handler/Sheet.hs
+++ b/src/Handler/Sheet.hs
@@ -1,6 +1,5 @@
 {-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE PartialTypeSignatures #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE TemplateHaskell #-}
@@ -314,16 +313,17 @@ getSShowR tid ssh csh shn = do
     , dbtStyle = def
     , dbtFilter = Map.empty
     , dbtIdent = "files" :: Text
-    , dbtSorting = [ ( "type"
-                     , SortColumn $ \(sheet `E.InnerJoin` sheetFile `E.InnerJoin` file) -> sheetFile E.^. SheetFileType
-                     )
-                   , ( "path"
-                     , SortColumn $ \(sheet `E.InnerJoin` sheetFile `E.InnerJoin` file) -> file E.^. FileTitle
-                     )
-                   , ( "time"
-                     , SortColumn $ \(sheet `E.InnerJoin` sheetFile `E.InnerJoin` file) -> file E.^. FileModified
-                     )
-                   ]
+    , dbtSorting = Map.fromList
+      [ ( "type"
+        , SortColumn $ \(sheet `E.InnerJoin` sheetFile `E.InnerJoin` file) -> sheetFile E.^. SheetFileType
+        )
+      , ( "path"
+        , SortColumn $ \(sheet `E.InnerJoin` sheetFile `E.InnerJoin` file) -> file E.^. FileTitle
+        )
+      , ( "time"
+        , SortColumn $ \(sheet `E.InnerJoin` sheetFile `E.InnerJoin` file) -> file E.^. FileModified
+        )
+      ]
     }
   (hasHints, hasSolution) <- runDB $ do
     hasHints <- (/= 0) <$> count [ SheetFileSheet ==. sid, SheetFileType ==. SheetHint ]
diff --git a/src/Model/Types.hs b/src/Model/Types.hs
index 8c0569cc3..d8f4c8820 100644
--- a/src/Model/Types.hs
+++ b/src/Model/Types.hs
@@ -81,6 +81,7 @@ import Data.Bits
 import Data.Ix
 import Data.List (genericIndex, elemIndex)
 import System.Random (Random(..))
+import Data.Data (Data)
 
 import Model.Types.Wordlist
 
@@ -536,7 +537,7 @@ derivePersistFieldJSON ''MailLanguages
 
 
 newtype Pseudonym = Pseudonym Word24
-  deriving (Eq, Ord, Read, Show)
+  deriving (Eq, Ord, Read, Show, Generic, Data)
   deriving newtype (Bounded, Enum, Integral, Num, Real, Bits, FiniteBits, Ix)
 
 
@@ -578,15 +579,15 @@ instance FromJSON Pseudonym where
       Nothing -> fail "Could not parse pseudonym words"
 
 instance ToJSON Pseudonym where
-  toJSON = toJSON . (review pseudonymWords :: Pseudonym -> [CI Text])
+  toJSON = toJSON . (review pseudonymWords :: Pseudonym -> [PseudonymWord])
 
-pseudonymWordlist :: [CI Text]
+pseudonymWordlist :: [PseudonymWord]
 pseudonymWordlist = $(wordlist "config/wordlist.txt")
 
-pseudonymWords :: Prism' [CI Text] Pseudonym
+pseudonymWords :: Prism' [PseudonymWord] Pseudonym
 pseudonymWords = prism' pToWords pFromWords
   where
-    pFromWords :: [CI Text] -> Maybe Pseudonym
+    pFromWords :: [PseudonymWord] -> Maybe Pseudonym
     pFromWords [w1, w2]
       | Just i1 <- elemIndex w1 pseudonymWordlist
       , Just i2 <- elemIndex w2 pseudonymWordlist
@@ -594,7 +595,7 @@ pseudonymWords = prism' pToWords pFromWords
       = Just $ shiftL (fromIntegral i1) 12 .|. fromIntegral i2
     pFromWords _ = Nothing
 
-    pToWords :: Pseudonym -> [CI Text]
+    pToWords :: Pseudonym -> [PseudonymWord]
     pToWords (Pseudonym p)
       = [ genericIndex pseudonymWordlist $ shiftR p 12 .&. maxWord
         , genericIndex pseudonymWordlist $ p .&. maxWord
@@ -606,6 +607,8 @@ pseudonymWords = prism' pToWords pFromWords
 
 -- Type synonyms
 
+type PseudonymWord   = CI Text
+
 type Email           = Text
 
 type SchoolName      = CI Text