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

app/models/artist.rb

@@ -183,7 +183,7 @@ class Artist < ActiveRecord::Base
         if params[:name]
           artist.name = params[:name]
           post = CurrentUser.without_safe_mode do
-            Post.tag_match("source:http #{artist.name}").first
+            Post.tag_match("source:http #{artist.name}").where("true /* Artist.new_with_defaults */").first
           end
           unless post.nil? || post.source.blank?
             artist.url_string = post.source
@@ -271,7 +271,7 @@ class Artist < ActiveRecord::Base
           ti.destroy if ti
 
           begin
-            Post.tag_match(name).each do |post|
+            Post.tag_match(name).where("true /* Artist.unban */").each do |post|
               post.unban!
               fixed_tags = post.tag_string.sub(/(?:\A| )banned_artist(?:\Z| )/, " ").strip
               post.update_attributes(:tag_string => fixed_tags)
@@ -289,7 +289,7 @@ class Artist < ActiveRecord::Base
       Post.transaction do
         CurrentUser.without_safe_mode do
           begin
-            Post.tag_match(name).each do |post|
+            Post.tag_match(name).where("true /* Artist.ban */").each do |post|
               post.ban!
             end
           rescue Post::SearchError

app/models/tag.rb

@@ -71,7 +71,7 @@ class Tag < ActiveRecord::Base
     end
 
     def real_post_count
-      @real_post_count ||= Post.raw_tag_match(name).count
+      @real_post_count ||= Post.raw_tag_match(name).where("true /* Tag#real_post_count */").count
     end
 
     def fix_post_count
@@ -131,7 +131,7 @@ class Tag < ActiveRecord::Base
 
     def update_category_post_counts
       Post.with_timeout(30_000, nil) do
-        Post.raw_tag_match(name).find_each do |post|
+        Post.raw_tag_match(name).where("true /* Tag#update_category_post_counts */").find_each do |post|
           post.reload
           post.set_tag_counts
           Post.where(:id => post.id).update_all(:tag_count => post.tag_count, :tag_count_general => post.tag_count_general, :tag_count_artist => post.tag_count_artist, :tag_count_copyright => post.tag_count_copyright, :tag_count_character => post.tag_count_character)

app/models/tag_implication.rb

@@ -186,7 +186,7 @@ class TagImplication < ActiveRecord::Base
 
   def update_posts
     Post.without_timeout do
-      Post.raw_tag_match(antecedent_name).find_each do |post|
+      Post.raw_tag_match(antecedent_name).where("true /* TagImplication#update_posts */").find_each do |post|
         fixed_tags = "#{post.tag_string} #{descendant_names}".strip
         CurrentUser.scoped(creator, creator_ip_addr) do
           post.update_attributes(