More fixes for #1865

* Reltag calculator
* Artist default urls (fixes #1149)
* Post count cache

app/logical/related_tag_calculator.rb

@@ -1,7 +1,9 @@
 class RelatedTagCalculator
   def self.find_tags(tag, limit)
-    Post.with_timeout(5_000, []) do
-      Post.tag_match(tag).limit(limit).select("posts.tag_string").reorder("posts.md5").map(&:tag_string)
+    CurrentUser.without_safe_mode do
+      Post.with_timeout(5_000, []) do
+        Post.tag_match(tag).limit(limit).select("posts.tag_string").reorder("posts.md5").map(&:tag_string)
+      end
     end
   end
 

app/models/artist.rb

@@ -128,11 +128,8 @@ class Artist < ActiveRecord::Base
       Artist.new.tap do |artist|
         if params[:name]
           artist.name = params[:name]
-          if CurrentUser.user.is_gold?
-            # below gold users are limited to two tags
-            post = Post.tag_match("source:http #{artist.name} status:any").first
-          else
-            post = Post.tag_match("source:http #{artist.name}").first
+          post = CurrentUser.without_safe_mode do
+            Post.tag_match("source:http #{artist.name}").first
           end
           unless post.nil? || post.source.blank?
             artist.url_string = post.source

app/models/post.rb

@@ -728,7 +728,9 @@ class Post < ActiveRecord::Base
 
     def fast_count_search(tags)
       count = Post.with_timeout(500, Danbooru.config.blank_tag_search_fast_count || 1_000_000) do
-        Post.tag_match(tags).count
+        CurrentUser.without_safe_mode do
+          Post.tag_match(tags).count
+        end
       end
       if count > 0
         set_count_in_cache(tags, count)