Allinea i KPI su due righe e aggiunge lo storico orario degli invii confermati.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/services/mailings/hourly_throughput.rb

@@ -1,6 +1,7 @@
 class Mailings::HourlyThroughput
   HOUR = 1.hour
   RECENT = 15.minutes
+  HISTORY_HOURS = 12
 
   def initialize(project, now: Time.current)
     @project = project
@@ -23,6 +24,31 @@ class Mailings::HourlyThroughput
     sent + failed
   end
 
+  def hourly_history
+    @hourly_history ||= begin
+      from = (@now - (HISTORY_HOURS - 1).hours).beginning_of_hour
+      keyed = recipients.sent
+        .where(sent_at: from..@now)
+        .pluck(:sent_at)
+        .each_with_object(Hash.new(0)) do |sent_at, counts|
+          counts[sent_at.in_time_zone.beginning_of_hour] += 1
+        end
+
+      HISTORY_HOURS.times.map do |index|
+        at = from + index.hours
+        { at: at, count: keyed[at] || 0 }
+      end
+    end
+  end
+
+  def history_total
+    hourly_history.sum { |bucket| bucket[:count] }
+  end
+
+  def history_max
+    [hourly_history.map { |bucket| bucket[:count] }.max, 1].max
+  end
+
   private
 
   def sent_since(window)