fixes #2812: StatementInvalid exception on all Profile Pages

app/models/pool_version.rb

@@ -130,6 +130,6 @@ class PoolVersion < ActiveRecord::Base
   end
 
   def previous
-    PoolVersion.where(["pool_id = ? and updated_at < ?", pool_id, updated_at]).order("updated_at desc").first
+    PoolArchive.where(["pool_id = ? and updated_at < ?", pool_id, updated_at]).order("updated_at desc").first
   end
 end

app/models/user.rb

@@ -674,7 +674,7 @@ class User < ActiveRecord::Base
     end
 
     def pool_version_count
-      PoolVersion.for_user(id).count
+      PoolArchive.for_user(id).count
     end
 
     def forum_post_count