This patch converts the generated schema to an enum type.
--- a/src/schema.rs
+++ b/src/schema.rs
@@ -4,13 +4,13 @@ table! {
 
     characters (id) {
         id -> Integer,
         user_id -> Integer,
         viewable -> Bool,
         character_name -> Text,
-        data_type -> Text,
+        data_type -> CharacterDataTypeMapping,
         data_version -> Integer,
         data -> Binary,
     }
 }
 
 table! {