Extract user tracking into concern (#2600)

app/controllers/concerns/user_tracking_concern.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+module UserTrackingConcern
+  extend ActiveSupport::Concern
+
+  REGENERATE_FEED_DAYS = 14
+  UPDATE_SIGN_IN_HOURS = 24
+
+  included do
+    before_action :set_user_activity, if: %i(user_signed_in? user_needs_sign_in_update?)
+  end
+
+  private
+
+  def set_user_activity
+    # Mark as signed-in today
+    current_user.update_tracked_fields!(request)
+
+    # Regenerate feed if needed
+    RegenerationWorker.perform_async(current_user.account_id) if user_needs_feed_update?
+  end
+
+  def user_needs_sign_in_update?
+    current_user.current_sign_in_at.nil? || current_user.current_sign_in_at < UPDATE_SIGN_IN_HOURS.hours.ago
+  end
+
+  def user_needs_feed_update?
+    current_user.last_sign_in_at < REGENERATE_FEED_DAYS.days.ago
+  end
+end