FIX: Importing with pgbouncer failed

Checking if all records have been imported uses a temp table in PostgreSQL. This fails when pgbouncer is used unless the temp table is created inside a transaction.

script/import_scripts/base.rb

@@ -219,6 +219,8 @@ class ImportScripts::Base
   def all_records_exist?(type, import_ids)
     return false if import_ids.empty?
 
+    ActiveRecord::Base.transaction do
+      begin
         connection = ActiveRecord::Base.connection.raw_connection
         connection.exec('CREATE TEMP TABLE import_ids(val text PRIMARY KEY)')
 
@@ -238,6 +240,8 @@ class ImportScripts::Base
       ensure
         connection.exec('DROP TABLE import_ids') unless connection.nil?
       end
+    end
+  end
 
   def created_user(user)
     # override if needed