The monitor seeds its six-hour activity buckets and its by-kind tallies from stored observations at session start, so the header pulse, the dashboard chart, and the traffic panel open mid-story after a restart instead of counting from zero. A once-per-session sweep prunes observations past the new history_days retention setting (default 365, 0 = keep forever), keeping the always-recording database bounded. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>