show some site change activity in global activity

app/activity.rb

@@ -8,7 +8,20 @@ get '/activity' do
     global_dataset.where! Sequel.qualify(:events, :id) => params[:event_id]
   end
 
-  @events = global_dataset.all
+  events = global_dataset.all
+  site_change_events = Event.global_site_changes_dataset.limit(25).all
+
+  @events = []
+
+  events.each do |event|
+    unless site_change_events.empty?
+      until site_change_events.first.created_at < event.created_at
+        @events << site_change_events.shift
+        break if site_change_events.empty?
+      end
+    end
+    @events << event
+  end
 
   erb :'activity'
 end

models/event.rb

@@ -14,6 +14,7 @@ class Event < Sequel::Model
 
   DEFAULT_GLOBAL_LIMIT = 300
   GLOBAL_VIEWS_MINIMUM = 5
+  GLOBAL_VIEWS_SITE_CHANGE_MINIMUM = 1000
 
   def self.news_feed_default_dataset
     select_all(:events).
@@ -33,6 +34,14 @@ class Event < Sequel::Model
       where(site_change_id: nil)
   end
 
+  def self.global_site_changes_dataset
+    news_feed_default_dataset.
+      where{views > GLOBAL_VIEWS_SITE_CHANGE_MINIMUM}.
+      exclude(is_nsfw: true).
+      exclude(is_crashing: true).
+      exclude(site_change_id: nil)
+  end
+
   def created_by?(site)
     return true if actioning_site_id == site.id
     false