#5752 "Container CPU and memory history lives in the one metric store". Docker persist now records each snapshot at its own time, so test_docker's June and early-October snapshots leave raw plugin_metrics rows older than the 7-day window, and the rollup's table-wide counts include them (CI run 9119: 11 buckets, not 1). The test's own host is still checked exactly: one hourly row averaging 15 over 2 samples, and one raw sample left. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>