As of v0.9.4, many (but not all) Delete operations are now Soft Deletes. (No undelete is currently available; CO-1104.) These are largely around People attributes, but also those involving Enrollment Flows and Enrollment Attributes. Future planned changes will introduce more Soft Delete capabilities (CO-95), including for Groups and configurations.
Note that Expunge is and will remain a Hard Soft Delete operation, as is deleting a CO.. Deleting a CO is a Hard Delete operation.
See also: Deleting Registry Records