Content freshness — what share of the live article corpus is fresh?

Buckets quality-passing articles (is_quality=True — the feed- eligible corpus) by the age of their created_at timestamp:

• fresh_24h — published in the last 24 hours
• fresh_7d — published in the last 7 days (cumulative, so it includes fresh_24h)
• stale — older than 7 days but still inside the window

The denominator (total) is every quality article created inside the requested window (default 30d; the window floor is 7d so the 24h/7d buckets always nest). Percentages are relative to total.

Answers the operator question "is the feed going stale?" at a glance: a falling fresh-share means intake has stalled or the quality gate is rejecting too much of what came in.