Alza soft capacity fase A e aggiunge quiet hours CPX notturne.

Home a 4 e cloud a 6 con MAX_NODES=12 (~76 soft); di notte (02–07 Europe/Rome) niente scale-out/warm-spare e sweeper che chiude i CPX idle.

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

backend/app/services/streams/night_cloud_sweeper.rb

@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+module Streams
+  # Durante quiet hours chiude CPX cloud idle; se hanno sessioni attive solo alert Ops.
+  class NightCloudSweeper
+    Result = Struct.new(:skipped, :actions, :error, keyword_init: true)
+
+    class << self
+      def enabled?
+        ENV.fetch("STREAM_NIGHT_SWEEP_ENABLED", "1") == "1"
+      end
+
+      def sweep!(provisioner: nil)
+        new(provisioner: provisioner).sweep!
+      end
+    end
+
+    def initialize(provisioner: nil)
+      @provisioner = provisioner || NodeProvisioner.new
+    end
+
+    def sweep!
+      unless self.class.enabled?
+        return Result.new(skipped: true, actions: [], error: "disabled")
+      end
+      unless QuietHours.active?
+        return Result.new(skipped: true, actions: [], error: "outside_quiet_hours")
+      end
+
+      actions = []
+      cloud_nodes.find_each do |node|
+        if node.occupying_sessions.exists?
+          alert_active_night_node!(node)
+          actions << :"alert_active_#{node.slug}"
+          next
+        end
+
+        close_idle_node!(node)
+        actions << :"decommission_#{node.slug}"
+      rescue NodeProvisioner::BusyError, NodeProvisioner::Error => e
+        Rails.logger.warn("[Streams::NightCloudSweeper] #{node.slug}: #{e.message}")
+        actions << :"error_#{node.slug}"
+      end
+
+      Rails.logger.info("[Streams::NightCloudSweeper] actions=#{actions.inspect}")
+      Result.new(skipped: false, actions: actions)
+    end
+
+    private
+
+    def cloud_nodes
+      StreamNode.where(role: "cloud").where(status: %w[ready draining provisioning])
+    end
+
+    def alert_active_night_node!(node)
+      Ops::IncidentRecorder.record(
+        {
+          kind: "stream_overflow",
+          severity: "warning",
+          title: "CPX attivo di notte — verificare evento",
+          message: "Nodo #{node.slug} ha #{node.active_publishers} sessione/i in quiet hours (#{QuietHours.range_config} #{QuietHours.time_zone_name})",
+          metadata: {
+            "slug" => node.slug,
+            "session_ids" => node.occupying_sessions.pluck(:id),
+            "quiet_hours" => QuietHours.range_config
+          },
+          fingerprint: "stream_overflow:night_active:#{node.slug}"
+        }
+      )
+    end
+
+    def close_idle_node!(node)
+      @provisioner.drain!(node) unless node.status == "draining"
+      node.reload
+      raise NodeProvisioner::BusyError, "sessioni ancora attive" if node.occupying_sessions.exists?
+
+      slug = node.slug
+      @provisioner.decommission!(node)
+      Rails.logger.warn("[Streams::NightCloudSweeper] decommissioned idle cloud node #{slug} during quiet hours")
+      Ops::IncidentRecorder.resolve(fingerprint: "stream_overflow:night_active:#{slug}")
+    end
+  end
+end