- prune_by_age(column) registers a time-series column with the hourly cleanup; Traefik (metrics, access summaries, global stats) and UniFi (WAN, client, WLAN, DPI, events, alarms, speedtests) register theirs in setup(). - Alert events join monitor results and Ansible runs on data.retention_days, read from Settings each run; Ansible run log files older than it are deleted. - audit.retention_days (365) keeps the audit log longer, set on Settings > General. - metric_series.points reads metrics.retention.raw_days, so the chart's raw/rollup seam is where the rollup put it (RAW_DAYS removed). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>