Daily domain delta: which domains gained or lost blocking countries overnight

Most censorship dashboards answer "is X blocked in Y right now?" The Voidly Atlas daily domain delta answers the question journalists actually need at 8 AM: which domains gained or lost blocking countries between yesterday and today. Pipeline diffs the per-domain set of blocking countries day-over-day across the 85K-row evidence table, requires min_observations=3 per (domain, country, day) to drop intermittent noise, and ships top 25 gainers + top 25 losers + a 7-day per-domain history as a pre-rendered sidecar. First build (2026-05-21) surfaced 15 movers across 13 domains — chat.openai.com and chatgpt.com both lost CN (overnight probe coverage shift, not a policy shift), Skype and Copilot picked up 14 countries each (probe rotation expanding into countries not probed yesterday). The endpoint refuses to dress this up: four honest caveats are baked into every response — probe coverage is uneven, intermittent connectivity flips bits, 24h windows have <500 global block measurements, and "lost a block" can just mean the country was probed once today vs three times yesterday. Endpoints: GET /v1/atlas/domain-delta (top movers + filters), /v1/atlas/domain-delta/<domain> (7d per-domain history), /v1/atlas/domain-delta/info (methodology + freshness). Cron 0 4 * * *.