Per-Request Query Budget (Detect Runaway Pages)

                  class QueryBudget
  def initialize(app, max_queries: 50)
    @app = app
    @max_queries = max_queries
  end

  def call(env)
    count = 0
    subscriber = ActiveSupport::Notifications.subscribe('sql.active_record') do |*, payload|
      next if payload[:name] == 'SCHEMA'
      count += 1
    end

    status, headers, body = @app.call(env)

    if Rails.env.development? && count > @max_queries
      Rails.logger.warn({ msg: 'query_budget_exceeded', count: count, path: env['PATH_INFO'] }.to_json)
    end

    [status, headers, body]
  ensure
    ActiveSupport::Notifications.unsubscribe(subscriber) if subscriber
  end
end