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

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(