API: Deleted deal stages not appearing in stay in pipeline stages from Deals
When a deal stage is deleted it is currently removed from the field stay_in_pipeline_stages. To track deal stage progression you must instead use the deal updates endpoint which is a massive log of events. Furthermore the information corresponding to the deleted deal stage is removed from the stages endpoint.
It would be far more useful to keep to keep the deleted deal stages in the stay_in_pipeline_stages field and the stages endpoint and just mark it as deactivated.