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Keep in mind that Changelog Behavior generally applies, even to delete and expunge operations. Even though deleted and expunged records will no longer appear in the user interface by default, they will remain in the underlying database, and can be viewed via the UI or REST API with appropriate requests. The only ways to remove these records from the database are to delete the entire CO (not typically recommended, except under limited test circumstances) or by manually removing the records via the database's toolset (also not typically recommended, as this can cause integrity problems if not done correctly).