Add RSS and JSON feeds of incidents and an open dataset

Let readers and bots follow new incidents without polling the card:
/:locale/feed.xml (RSS 2.0) and /:locale/feed.json (JSON Feed 1.1),
the latest 50 incidents with stable IDs, advertised in the page head
and footer.

/data.json publishes every datacenter with its specs and sourced
incidents under CC BY 4.0, for journalists and OSINT reuse.

Assisted-by: Claude:opus-5

CLAUDE.md

@@ -31,6 +31,15 @@ Content is edited in the asxp.io admin (`/admin/bingo`, repo `asxpio`:
   (card; `?view=all`, `?p[]=provider`), `/:locale/dc/:slug`, `/sitemap.xml`,
   `/robots.txt`, `/p/:file` (photo proxy, immutable), `/<indexnow-key>.txt`,
   icons, `/healthz`.
+- Feeds: `/:locale/feed.xml` (RSS 2.0) and `/:locale/feed.json` (JSON Feed
+  1.1), the latest 50 incidents, newest first. Item IDs are
+  `tag:<host>,2026:incident-<id>`, so they stay stable when an incident is
+  edited. Pages advertise both via `<link rel="alternate">` and in the
+  footer.
+- `/data.json`: every datacenter with names in all locales, specs, pages,
+  photo credit and incidents with sources. Licensed CC BY 4.0, with the
+  attribution inside the file. Feeds and dataset send
+  `Access-Control-Allow-Origin: *`.
 - `config.ru`: `www.` → `BINGO_HOST` 301.
 - `views/`: `layout.erb` (CSS and SEO head), `index.erb` (card, provider
   filter, dialogs), `dc.erb`, partials. `assets/`: icons.

README.md

@@ -13,4 +13,13 @@ of Claude (Anthropic). Part of the list came from the
 [hackyourmom datacenter map](https://hackyourmom.com/en/karta-data-czentriv-na-rasii/)
 (data by Cat Eyes OSINT), and each entry was re-verified.
 
+## Data
+
+- **Incident feeds:** `/en/feed.xml` (RSS) and `/en/feed.json` (JSON Feed).
+  Swap `en` for `ru` or `uk`.
+- **Full dataset:** [`/data.json`](https://datacenterbingo.xyz/data.json),
+  licensed [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).
+  Credit "Datacenter Bingo (datacenterbingo.xyz)"; the full attribution
+  line is in the file.
+
 Development: `nix develop`, then `bin/test`. See `CLAUDE.md`.

app.rb

@@ -26,6 +26,8 @@ end
 # database and photo bucket.
 class BingoWeb < Sinatra::Base
   SOURCE_URL = 'https://github.com/asxpi/datacenterbingo'.freeze
+  LICENSE_URL = 'https://creativecommons.org/licenses/by/4.0/'.freeze
+  FEED_SIZE = 50
   HOSTS = [ENV['BINGO_HOST'], ENV['BINGO_ALT_HOST']].compact.reject(&:empty?).freeze
 
   configure do
@@ -157,6 +159,28 @@ class BingoWeb < Sinatra::Base
       { 'building' => t(:building), 'planned' => t(:planned) }[dc.status]
     end
 
+    # Stable per incident across edits, so readers don't show duplicates.
+    def incident_id(i) = "tag:#{ENV.fetch('BINGO_HOST', request.host)},2026:incident-#{i.id}"
+
+    # Feed entry body: what happened, the datacenter facts, the source.
+    def incident_html(i)
+      h = Rack::Utils.method(:escape_html)
+      parts = ["<p>#{h.(i.l(:title, @locale))}</p>", "<p>#{h.(dc_facts(i.datacenter).join(' '))}</p>"]
+      parts << %(<p><a href="#{h.(i.url)}">#{h.(t(:source))}</a></p>) if i.url
+      parts.join
+    end
+
+    def incident_headline(i)
+      "#{kind_label(i.kind)}: #{i.datacenter.l(:name, @locale)} — #{i.l(:title, @locale)}"
+    end
+
+    def feed_incidents
+      Bingo::Incident.order(Sequel.desc(:occurred_on), Sequel.desc(:id)).limit(FEED_SIZE)
+                     .eager(datacenter: :incidents).all
+    end
+
+    def feed_time(i) = Time.utc(i.occurred_on.year, i.occurred_on.month, i.occurred_on.day)
+
     def preferred_locale
       langs = request.env['HTTP_ACCEPT_LANGUAGE'].to_s.downcase.scan(/([a-z]{2})(?:-[a-z]+)?(?:;q=([\d.]+))?/)
       langs.sort_by { |_, q| -(q || '1').to_f }.map(&:first).find { |l| Bingo::LOCALES.include?(l) } || 'en'
@@ -232,6 +256,72 @@ class BingoWeb < Sinatra::Base
     erb :dc
   end
 
+  # Incident feeds per locale: RSS 2.0 and JSON Feed 1.1, newest first.
+  get %r{/(ru|en|uk)/feed\.xml} do |locale|
+    @locale = locale
+    @incidents = feed_incidents
+    content_type 'application/rss+xml', charset: 'utf-8'
+    cache_control :public, max_age: 300
+    erb :feed_rss, layout: false
+  end
+
+  get %r{/(ru|en|uk)/feed\.json} do |locale|
+    @locale = locale
+    content_type 'application/feed+json', charset: 'utf-8'
+    headers 'Access-Control-Allow-Origin' => '*'
+    cache_control :public, max_age: 300
+    JSON.pretty_generate(
+      version: 'https://jsonfeed.org/version/1.1',
+      title: format(t(:feed_title), site: t(:title)),
+      description: t(:tagline),
+      home_page_url: "#{base_url}/#{locale}",
+      feed_url: "#{base_url}/#{locale}/feed.json",
+      language: locale,
+      icon: "#{base_url}/apple-touch-icon.png",
+      favicon: "#{base_url}/favicon.ico",
+      authors: [{ name: 'asxpi', url: 'https://asxp.io' }],
+      items: feed_incidents.map do |i|
+        dc = i.datacenter
+        { id: incident_id(i), url: "#{base_url}#{dc_path(dc)}", external_url: i.url,
+          title: incident_headline(i), content_html: incident_html(i),
+          image: (dc.photo_key && "#{base_url}#{photo_path(dc, 1200)}"),
+          date_published: feed_time(i).iso8601, date_modified: i.updated_at&.utc&.iso8601,
+          tags: [kind_label(i.kind), Bingo.provider_name(dc.provider, locale)].compact.uniq }.compact
+      end
+    )
+  end
+
+  # The whole dataset, every language, for reuse under CC BY 4.0.
+  get '/data.json' do
+    content_type 'application/json', charset: 'utf-8'
+    headers 'Access-Control-Allow-Origin' => '*'
+    cache_control :public, max_age: 300
+    loc = ->(row, field) { Bingo::LOCALES.to_h { |l| [l, row.l(field, l)] } }
+    dcs = Bingo::Datacenter.order(:position, :id).eager(:incidents).all
+    JSON.pretty_generate(
+      title: 'Datacenter Bingo dataset',
+      description: "Russia's largest datacenters with publicly sourced incidents (strikes, fires, outages).",
+      home_page_url: "#{base_url}/",
+      license: 'CC-BY-4.0',
+      license_url: LICENSE_URL,
+      attribution: "Datacenter Bingo (#{base_url}/), collected and verified with the help of Claude (Anthropic); " \
+                   'part of the list from the hackyourmom datacenter map (data by Cat Eyes OSINT), re-verified.',
+      updated_at: Bingo::Board.load.updated_on&.utc&.iso8601,
+      datacenters: dcs.map do |dc|
+        { slug: dc.slug, rank: dc.position, name: loc.(dc, :name), city: loc.(dc, :city),
+          operator: dc.operator, provider: dc.provider, status: dc.status,
+          mw: dc.mw, mw_value: Bingo.mw_value(dc.mw), mw_type: dc.mw_type, year: dc.year,
+          info_url: dc.info_url,
+          pages: Bingo::LOCALES.to_h { |l| [l, "#{base_url}#{dc_path(dc, l)}"] },
+          photo: dc.photo_key && { url: "#{base_url}#{photo_path(dc, 1200)}", credit: dc.photo_credit,
+                                   source_url: dc.photo_source_url },
+          incidents: dc.incidents.map do |i|
+            { date: i.occurred_on.iso8601, kind: i.kind, title: loc.(i, :title), source_url: i.url }
+          end }
+      end
+    )
+  end
+
   # IndexNow key file: proves to the engines that pings come from us.
   get %r{/([A-Za-z0-9-]{8,128})\.txt} do |name|
     halt 404 unless name == Bingo::IndexNow.key

lib/bingo.rb

@@ -29,6 +29,11 @@ module Bingo
 
   def self.provider_name(slug, locale) = PROVIDERS.dig(slug, locale) || slug
 
+  # "64" → 64.0, "25–30" → 30.0, ">40" → 40.0, "13,7" → 13.7, "" → nil
+  def self.mw_value(mw)
+    mw.to_s.tr(',', '.').scan(/\d+(?:\.\d+)?/).map(&:to_f).max
+  end
+
   # Every row, column and both diagonals, as 0-based cell indices.
   LINES = (
     (0...SIZE).map { |r| (0...SIZE).map { |c| r * SIZE + c } } +
@@ -54,6 +59,7 @@ module Bingo
       credits_ai: 'Информация собрана и проверена с помощью Claude (Anthropic).',
       credits_hym: 'Спасибо %{link} (данные Cat Eyes OSINT) за часть списка: каждая запись перепроверена по сайтам операторов и прессе.',
       source_code: 'Исходный код на GitHub',
+      feed_title: '%{site} — Журнал инцидентов', open_data: 'Открытые данные (CC BY 4.0)',
       footer: 'Данные из открытых источников (2025–2026). Клетка зачёркивается только по публичному источнику.',
       kinds: { 'strike' => 'Атака БПЛА', 'fire' => 'Пожар', 'outage' => 'Отключение', 'flood' => 'Затопление', 'cooling' => 'Перегрев', 'other' => 'Инцидент' },
       letters: %w[Б И Н Г О],
@@ -85,6 +91,7 @@ module Bingo
       credits_ai: 'Information collected and verified with the help of Claude (Anthropic).',
       credits_hym: 'Thanks to %{link} (data by Cat Eyes OSINT) for part of the list; every entry was re-verified against operator sites and the press.',
       source_code: 'Source code on GitHub',
+      feed_title: '%{site} — Incident log', open_data: 'Open data (CC BY 4.0)',
       footer: 'Open-source data (2025–2026). A cell is crossed out only with a public source.',
       kinds: { 'strike' => 'Drone strike', 'fire' => 'Fire', 'outage' => 'Outage', 'flood' => 'Flood', 'cooling' => 'Overheating', 'other' => 'Incident' },
       letters: %w[B I N G O],
@@ -116,6 +123,7 @@ module Bingo
       credits_ai: 'Інформацію зібрано й перевірено за допомогою Claude (Anthropic).',
       credits_hym: 'Дякуємо %{link} (дані Cat Eyes OSINT) за частину списку: кожен запис перевірено за сайтами операторів і пресою.',
       source_code: 'Вихідний код на GitHub',
+      feed_title: '%{site} — Журнал інцидентів', open_data: 'Відкриті дані (CC BY 4.0)',
       footer: 'Дані з відкритих джерел (2025–2026). Клітинка закреслюється лише за публічним джерелом.',
       kinds: { 'strike' => 'Атака БПЛА', 'fire' => 'Пожежа', 'outage' => 'Відключення', 'flood' => 'Затоплення', 'cooling' => 'Перегрів', 'other' => 'Інцидент' },
       letters: %w[Б І Н Г О],

test/bingo_test.rb

@@ -342,6 +342,78 @@ class BingoTest < Minitest::Test
     assert_includes last_response.body, 'github.com/asxpi/datacenterbingo'
   end
 
+  def test_rss_feed
+    old = hit!(1, kind: 'fire')
+    old.update(occurred_on: Date.new(2026, 1, 2), url: 'https://example.com/fire?a=1&b=2')
+    hit!(3, kind: 'strike')
+    get '/en/feed.xml'
+    assert last_response.ok?
+    assert_equal 'application/rss+xml;charset=utf-8', last_response.content_type
+    require 'rexml/document'
+    doc = REXML::Document.new(last_response.body)
+    assert_equal 'Datacenter Bingo — Incident log', doc.elements['rss/channel/title'].text
+    items = doc.get_elements('rss/channel/item')
+    assert_equal 2, items.size
+    assert_equal 'Drone strike: ЦОД 4 — Авария 3', items[0].elements['title'].text # newest first, ru fallback
+    assert_equal 'https://example.org/en/dc/dc-2', items[1].elements['link'].text
+    assert_equal "tag:example.org,2026:incident-#{old.id}", items[1].elements['guid'].text
+    assert_equal 'Fri, 02 Jan 2026 00:00:00 -0000', items[1].elements['pubDate'].text
+    assert_includes items[1].elements['description'].text, '<a href="https://example.com/fire?a=1&amp;b=2">Source</a>'
+    get '/uk/feed.xml'
+    assert_includes last_response.body, '<title>Бінго ЦОДів — Журнал інцидентів</title>'
+    get '/xx/feed.xml'
+    assert_equal 404, last_response.status
+  end
+
+  def test_json_feed
+    hit!(0, kind: 'outage').update(url: 'https://example.com/n')
+    @dcs[0].update(provider: 'yandex', photo_key: 'bingo/dc-1-0123abcd.jpg', photo_variants: true)
+    get '/ru/feed.json'
+    assert last_response.ok?
+    assert_equal 'application/feed+json;charset=utf-8', last_response.content_type
+    assert_equal '*', last_response.headers['access-control-allow-origin']
+    feed = JSON.parse(last_response.body)
+    assert_equal 'https://jsonfeed.org/version/1.1', feed['version']
+    assert_equal 'https://example.org/ru/feed.json', feed['feed_url']
+    item = feed['items'].fetch(0)
+    assert_equal 'Отключение: ЦОД 1 — Авария 0', item['title']
+    assert_equal 'https://example.org/ru/dc/dc-1', item['url']
+    assert_equal 'https://example.com/n', item['external_url']
+    assert_equal 'https://example.org/p/dc-1-0123abcd-1200.webp', item['image']
+    assert_equal %w[Отключение Яндекс], item['tags']
+    assert_equal "#{Date.today.iso8601}T00:00:00Z", item['date_published']
+  end
+
+  def test_open_dataset
+    hit!(4, kind: 'fire').update(url: 'https://example.com/f', title_en: 'Fire')
+    @dcs[4].update(mw: '25–30', mw_type: 'it', provider: 'rtk')
+    get '/data.json'
+    assert last_response.ok?
+    assert_equal '*', last_response.headers['access-control-allow-origin']
+    data = JSON.parse(last_response.body)
+    assert_equal 'CC-BY-4.0', data['license']
+    assert_includes data['attribution'], 'Cat Eyes OSINT'
+    assert_equal 25, data['datacenters'].size
+    dc = data['datacenters'].find { |d| d['slug'] == 'dc-5' }
+    assert_equal 5, dc['rank']
+    assert_equal 30.0, dc['mw_value']
+    assert_equal({ 'ru' => 'ЦОД 5', 'en' => 'ЦОД 5', 'uk' => 'ЦОД 5' }, dc['name'])
+    assert_equal 'https://example.org/uk/dc/dc-5', dc['pages']['uk']
+    assert_equal [{ 'date' => Date.today.iso8601, 'kind' => 'fire',
+                    'title' => { 'ru' => 'Авария 4', 'en' => 'Fire', 'uk' => 'Аварія 4' },
+                    'source_url' => 'https://example.com/f' }], dc['incidents']
+  end
+
+  def test_pages_link_the_feeds
+    get '/en'
+    body = last_response.body
+    assert_includes body, '<link rel="alternate" type="application/rss+xml" title="Datacenter Bingo — Incident log" href="https://example.org/en/feed.xml">'
+    assert_includes body, 'type="application/feed+json"'
+    assert_includes body, '<a href="/en/feed.xml">RSS</a> · <a href="/en/feed.json">JSON Feed</a> · <a href="/data.json">Open data (CC BY 4.0)</a>'
+    get '/ru/dc/dc-1'
+    assert_includes last_response.body, 'href="https://example.org/ru/feed.xml"'
+  end
+
   def test_static_files_not_served
     get '/style.css'
     assert_equal 404, last_response.status

views/_footer.erb

@@ -2,5 +2,6 @@
   <p><%= t(:footer) %></p>
   <p class="credits"><%= t(:credits_ai) %>
     <%== format(Rack::Utils.escape_html(t(:credits_hym)), link: '<a href="https://hackyourmom.com/en/karta-data-czentriv-na-rasii/" target="_blank" rel="noopener">hackyourmom</a>') %></p>
+  <p><a href="/<%= @locale %>/feed.xml">RSS</a> · <a href="/<%= @locale %>/feed.json">JSON Feed</a> · <a href="/data.json"><%= t(:open_data) %></a></p>
   <p>© <%= Date.today.year %> <a href="https://asxp.io">asxp.io</a> · <a href="<%= BingoWeb::SOURCE_URL %>" rel="noopener"><%= t(:source_code) %></a></p>
 </footer>

views/feed_rss.erb

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<% base = base_url %>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+  <channel>
+    <title><%= format(t(:feed_title), site: t(:title)) %></title>
+    <link><%= base %>/<%= @locale %></link>
+    <description><%= t(:tagline) %></description>
+    <language><%= @locale %></language>
+    <atom:link href="<%= base %>/<%= @locale %>/feed.xml" rel="self" type="application/rss+xml"/>
+    <% if (top = @incidents.first) %>
+    <lastBuildDate><%= [*@incidents.map(&:updated_at).compact, feed_time(top)].max.utc.rfc2822 %></lastBuildDate>
+    <% end %>
+    <% @incidents.each do |i| %>
+    <item>
+      <title><%= incident_headline(i) %></title>
+      <link><%= base %><%= dc_path(i.datacenter) %></link>
+      <guid isPermaLink="false"><%= incident_id(i) %></guid>
+      <pubDate><%= feed_time(i).rfc2822 %></pubDate>
+      <category><%= kind_label(i.kind) %></category>
+      <description><%= incident_html(i) %></description>
+    </item>
+    <% end %>
+  </channel>
+</rss>

views/layout.erb

@@ -17,6 +17,8 @@
 <link rel="alternate" hreflang="x-default" href="<%= base %><%= @x_default %>">
 <% end %>
 <link rel="sitemap" type="application/xml" href="/sitemap.xml">
+<link rel="alternate" type="application/rss+xml" title="<%= format(t(:feed_title), site: t(:title)) %>" href="<%= base %>/<%= @locale %>/feed.xml">
+<link rel="alternate" type="application/feed+json" title="<%= format(t(:feed_title), site: t(:title)) %>" href="<%= base %>/<%= @locale %>/feed.json">
 <meta property="og:type" content="website">
 <meta property="og:site_name" content="<%= t(:title) %>">
 <meta property="og:title" content="<%= @title %>">