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>
