Cleanup eval serialization

Signed-off-by: Shea Levy <shea@shealevy.com>

src/lib/Hydra/Schema/JobsetEvalInputs.pm

@@ -169,6 +169,14 @@ __PACKAGE__->belongs_to(
 # Created by DBIx::Class::Schema::Loader v0.07033 @ 2013-06-13 01:54:50
 # DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:1Dp8B58leBLh4GK0GPw2zg
 
+my %hint = (
+    columns => [
+        "revision"
+    ],
+);
+
+sub json_hint {
+    return \%hint;
+}
 
-# You can replace this text with custom code or comments, and it will be preserved on regeneration
 1;