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/quiet_hours.rb

@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+module Streams
+  # Finestra notturna (default 02:00–07:00 Europe/Rome) in cui non devono restare CPX idle.
+  module QuietHours
+    DEFAULT_RANGE = "02:00-07:00"
+    DEFAULT_TZ = "Europe/Rome"
+
+    module_function
+
+    def range_config
+      ENV.fetch("STREAM_AUTOSCALE_QUIET_HOURS", DEFAULT_RANGE).to_s.strip
+    end
+
+    def time_zone_name
+      ENV.fetch("STREAM_AUTOSCALE_QUIET_TZ", DEFAULT_TZ)
+    end
+
+    def configured?
+      range_config.present? && range_config != "off" && range_config != "0"
+    end
+
+    def active?(now: Time.current)
+      return false unless configured?
+
+      zone = ActiveSupport::TimeZone[time_zone_name] || Time.find_zone!(time_zone_name)
+      local = now.in_time_zone(zone)
+      start_min, end_min = parse_range(range_config)
+      return false if start_min.nil? || end_min.nil?
+
+      current = local.hour * 60 + local.min
+      if start_min <= end_min
+        current >= start_min && current < end_min
+      else
+        # es. 22:00-06:00
+        current >= start_min || current < end_min
+      end
+    rescue ArgumentError => e
+      Rails.logger.warn("[Streams::QuietHours] invalid config: #{e.message}")
+      false
+    end
+
+    def parse_range(raw)
+      start_s, end_s = raw.split("-", 2).map { |p| p.to_s.strip }
+      return [nil, nil] if start_s.blank? || end_s.blank?
+
+      [parse_hhmm(start_s), parse_hhmm(end_s)]
+    end
+
+    def parse_hhmm(value)
+      h, m = value.split(":", 2)
+      hours = Integer(h)
+      mins = Integer(m || 0)
+      raise ArgumentError, "ora fuori range: #{value}" unless hours.between?(0, 23) && mins.between?(0, 59)
+
+      hours * 60 + mins
+    end
+  end
+end