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It is possible that a node will have no owned token ranges in some keyspaces based on their replication strategy, if the strategy is configured to have no replicas in this node's data center. In this case we should go ahead with cleanup that will effectively delete all data. Note that this is current very inefficient as we need to filter every partition and drop it as unowned. It can be optimized by either special casing this case or, better, use skip forward to the next owned range. This will skip to end-of-stream since there are no owned ranges. Fixes #13634 Also, add a respective rest_api unit test Closes #13849 * github.com:scylladb/scylladb: test: rest_api: test_storage_service: add test_storage_service_keyspace_cleanup_with_no_owned_ranges compaction_manager: perform_cleanup: handle empty owned ranges