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02e8d474e2
<!-- Add the related story/sub-task/bug number, like Resolves #123, or remove if NA --> **Related issue:** Resolves #41664 Switching `kernel_host_counts` to the established swap pattern. Reduce load on the DB writer by moving the large read to the DB reader. Do `CleanupSoftwareTitles` in batches. With a single large select/delete, it took > 16 minutes. In batches, it took ~1.5 minutes in loadtest with 100K hosts. # Checklist for submitter If some of the following don't apply, delete the relevant line. - [x] Changes file added for user-visible changes in `changes/`, `orbit/changes/` or `ee/fleetd-chrome/changes`. ## Testing - [x] QA'd all new/changed functionality manually For unreleased bug fixes in a release candidate, one of: - [x] Alerted the release DRI if additional load testing is needed <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Performance Improvements** * Added indexing and a batched swap/insert flow to speed up vulnerability-related queries and lower maintenance contention. * Batched cleanup of orphaned records to reduce long-running delete operations. * **Reliability** * Migration removes a legacy constraint to simplify data maintenance and avoid migration failures. * Scheduled vulnerability refresh now runs more atomically to reduce disruption. * **Tests** * Updated assertion logic to improve test clarity for host-count verification. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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* Reduced database contention during the vulnerability cron.
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* Added a secondary index on `host_software(software_id)` to improve query performance.
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