Fix compilation when DBENGINE is disabled #21323
Merged
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Summary
Fixes #21321
Summary by cubic
Restore compilation when DBENGINE is disabled by gating the parallel host iteration behind ENABLE_DBENGINE. When DBENGINE is off, query_scope_foreach_host is used with weights_do_node_callback, skipping the parallel path.
Written for commit 97d6b42. Summary will update automatically on new commits.