limit number of synchronous saved search updates

app/models/saved_search.rb

@@ -19,16 +19,18 @@ class SavedSearch < ApplicationRecord
         label = normalize_label(label) if label
         queries = queries_for(user_id, label: label)
         post_ids = Set.new
+        update_count = 0
         queries.each do |query|
           redis_key = "search:#{query}"
           if redis.exists(redis_key)
             sub_ids = redis.smembers(redis_key).map(&:to_i)
             post_ids.merge(sub_ids)
             redis.expire(redis_key, REDIS_EXPIRY)
-          elsif CurrentUser.is_gold?
+          elsif CurrentUser.is_gold? && update_count < 5
             SavedSearch.populate(query)
             sub_ids = redis.smembers(redis_key).map(&:to_i)
             post_ids.merge(sub_ids)
+            update_count += 1
           else
             SavedSearch.delay(queue: "default").populate(query)
           end

script/fixes/056_message_nonascii_usernames.rb

@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+require File.expand_path(File.join(File.dirname(__FILE__), '..', '..', 'config', 'environment'))
+
+CurrentUser.user = User.system
+CurrentUser.ip_addr = "127.0.0.1"
+
+User.where("name !~ ?", "^[ -~]*$").find_each do |user|
+  Dmail.create_automated(
+    :to_id => user.id,
+    :title => "Name change required",
+    :body => "Because of issues with users exploiting various Unicode characters in their name, in the future all non-ASCII characters and any non-printable characters will be forbidden. This means you will have to change your name. You can visit \"this page\":/user_name_change_requests/new to change your name. You will have 30 days to change your name or else your account will be banned."
+  )
+end