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The density chart is an interactive filter control; a 5-minute private browser cache let it show stale month counts after an edit/upload/re-tag. The in-memory aggregation is sub-200ms p95 over ~5k docs, so there is no load reason to cache. Removing the explicit header lets Spring Security's default no-store directive apply, so the response is always fresh. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>