re: https://www.rubydoc.info/gems/rubocop/RuboCop/Cop/Style/FrozenStringLiteralComment
The controllers are not using the serializers, because of a bug in active_model_serializer. Hence the update.API tests are fixed to work with the new API response structure. Fixes bugs in conference serializer.
and cleanup api/v1/tracks and api/v1/rooms controllers