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Added
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* Support for a description field on route rules and security rules in the Networking service
* Support for starting and stopping Digital Assistant instances in the Digital Assistant service
* Support for shared database homes on Exadata, bare metal, and virtual machine instances in the Database service
* Support for tracking a number of Database service operations through the Work Requests service
Breaking
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* Field `db_home_id` in `list_databases` from database service is changed from required to optional
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