So, can we assume that deleting a project does not delete the related objects from the Failed Data Repository? What other contents/objects do not get deleted when an entire IS project is deleted from the CMC?
Yes, Deleting a project will not delete the failed data content associated with project, if you are using a separate failed data database per project, then you can drop the Database
if you are using a common FD DB for multiple projects, then it becomes little difficult, you will have to delete the data related to this project from IS_FD_XXXX tables and also drop the views and tables associated with this project. You will also run into issues, if you reuse the same FD DB for the contents of the deleted project by reimporting them in the project with the same name
Rest of the contents from IS Repo/CMS Repo are deleted on deleting a project from CMC