post/pool versions: fix database timeouts not being set.

Bug: database timeouts were set only on the main database, not on the
post and pool versions database, so users effectively had an unlimited
timeout when dealing with these things.

app/controllers/post_versions_controller.rb

@@ -1,11 +1,11 @@
 class PostVersionsController < ApplicationController
   before_action :member_only, except: [:index, :search]
   before_action :check_availabililty
+  around_action :set_timeout
   respond_to :html, :xml, :json
   respond_to :js, only: [:undo]
 
   def index
-    # XXX statement timeouts
     @post_versions = PostArchive.includes(:updater, post: [:versions]).search(search_params).paginate(params[:page], :limit => params[:limit], :search_count => params[:search])
     respond_with(@post_versions)
   end
@@ -22,6 +22,13 @@ class PostVersionsController < ApplicationController
 
   private
 
+  def set_timeout
+    PostArchive.connection.execute("SET statement_timeout = #{CurrentUser.user.statement_timeout}")
+    yield
+  ensure
+    PostArchive.connection.execute("SET statement_timeout = 0")
+  end
+
   def check_availabililty
     if !PostArchive.enabled?
       raise NotImplementedError.new("Archive service is not configured. Post versions are not saved.")