update to rails 4.2.5.1, add debugging info for tracking slow queries

app/logical/moderator/tag_batch_change.rb

@@ -12,7 +12,7 @@ module Moderator
 
       CurrentUser.without_safe_mode do
         CurrentUser.scoped(updater, updater_ip_addr) do
-          ::Post.tag_match(antecedent).find_each do |post|
+          ::Post.tag_match(antecedent).where("true /* Moderator::TagBatchChange#perform */").find_each do |post|
             tags = (post.tag_array - normalized_antecedent + normalized_consequent).join(" ")
             post.update_attributes(:tag_string => tags)
           end

app/logical/post_sets/artist.rb

@@ -9,7 +9,7 @@ module PostSets
 
     def posts
       @posts ||= begin
-        query = ::Post.tag_match(@artist.name).limit(10)
+        query = ::Post.tag_match(@artist.name).where("true /* PostSets::Artist#posts */").limit(10)
         query.each # hack to force rails to eager load
         query
       end

app/logical/post_sets/post.rb

@@ -70,7 +70,7 @@ module PostSets
     end
 
     def has_deleted?
-      tag_string !~ /status/ && ::Post.tag_match("#{tag_string} status:deleted").exists?
+      tag_string !~ /status/ && ::Post.tag_match("#{tag_string} status:deleted").where("true /* PostSets::Post#has_deleted */").exists?
     end
 
     def has_explicit?
@@ -127,9 +127,9 @@ module PostSets
         if random
           temp = get_random_posts()
         elsif raw
-          temp = ::Post.raw_tag_match(tag_string).order("posts.id DESC").paginate(page, :count => post_count, :limit => per_page)
+          temp = ::Post.raw_tag_match(tag_string).order("posts.id DESC").where("true /* PostSets::Post#posts:1 */").paginate(page, :count => post_count, :limit => per_page)
         else
-          temp = ::Post.tag_match(tag_string, read_only).paginate(page, :count => post_count, :limit => per_page)
+          temp = ::Post.tag_match(tag_string, read_only).where("true /* PostSets::Post#posts:2 */").paginate(page, :count => post_count, :limit => per_page)
         end
         temp.each # hack to force rails to eager load
         temp

app/logical/related_tag_calculator.rb

@@ -53,9 +53,9 @@ class RelatedTagCalculator
     candidates = convert_hash_to_array(counts, 100)
     similar_counts = Hash.new {|h, k| h[k] = 0}
     CurrentUser.without_safe_mode do
-      Post.with_timeout(5_000) do
+      PostReadOnly.with_timeout(5_000) do
         candidates.each do |ctag, _|
-          acount = Post.tag_match("#{tag} #{ctag}").count
+          acount = PostReadOnly.tag_match("#{tag} #{ctag}").count
           ctag_record = Tag.find_by_name(ctag)
           div = Math.sqrt(tag_record.post_count * ctag_record.post_count)
           if div != 0

app/logical/user_deletion.rb

@@ -6,7 +6,7 @@ class UserDeletion
   def self.remove_favorites_for(user_id)
     user = User.find(user_id)
     Post.without_timeout do
-      Post.raw_tag_match("fav:#{user_id}").find_each do |post|
+      Post.raw_tag_match("fav:#{user_id}").where("true /* UserDeletion.remove_favorites_for */").find_each do |post|
         Favorite.remove(post, user)
       end
     end