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diff --git a/overlays/spm/server/Data/CaseInsensitive/Instances.hs b/overlays/spm/server/Data/CaseInsensitive/Instances.hs
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+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Data.CaseInsensitive.Instances () where
+
+import Prelude
+import Database.Persist
+import Database.Persist.Sql
+
+import Data.CaseInsensitive (CI)
+import qualified Data.CaseInsensitive as CI
+
+import Data.Text (Text)
+import qualified Data.Text as Text
+import qualified Data.Text.Encoding as Text
+
+import Control.Exception
+
+
+instance PersistField (CI Text) where
+  toPersistValue = PersistLiteralEscaped . Text.encodeUtf8 . CI.original
+  fromPersistValue = \case
+    PersistText t -> Right $ CI.mk t
+    PersistLiteralEscaped bs -> case Text.decodeUtf8' bs of
+      Right t   -> Right $ CI.mk t
+      Left  err -> Left $ "Could not decode PersistLiteral as UTF-8: " <> Text.pack (displayException err)
+    o -> Left $ "Expected PersistText or PersistLiteral but got ‘" <> Text.pack (show o) <> "’"
+
+instance PersistFieldSql (CI Text) where
+  sqlType _ = SqlOther "citext"