old_contents: import os
  from google.appengine.ext import ndb
  from google.appengine.ext import deferred
  from google.appengine.ext.webapp import template
  from controllers.base_controller import LoggedInHandler
  
  from models.event import Event
  from helpers.match_manipulator import MatchManipulator
  
  def add_year(event_key):
    logging.info(event_key)
    matches = event_key.get().matches
    if matches:
      for match in matches:
        match.year = int(match.event.id()[:4])
        match.dirty = True
        MatchManipulator.createOrUpdate(match)
  
  class AdminMigration(LoggedInHandler):
    def get(self):
      self._require_admin()
      path = os.path.join(os.path.dirname(__file__), '../../templates/admin/migration.html')
      self.response.out.write(template.render(path, self.template_values))
  
  
  class AdminMigrationAddMatchYear(LoggedInHandler):
    def get(self):
      self._require_admin()
      for year in range(1992, 2016):
        event_keys = Event.query(Event.year == year).fetch(keys_only=True)
        for event_key in event_keys:
          deferred.defer(add_year, event_key, _queue="admin")
      self.response.out.write(event_keys)
  
new_contents: import os
  import logging
  from google.appengine.ext import ndb
  from google.appengine.ext import deferred
  from google.appengine.ext.webapp import template
  from controllers.base_controller import LoggedInHandler
  
  from models.event import Event
  from helpers.match_manipulator import MatchManipulator
  
  def add_year(event_key):
    logging.info(event_key)
    matches = event_key.get().matches
    if matches:
      for match in matches:
        match.year = int(match.event.id()[:4])
        match.dirty = True
        MatchManipulator.createOrUpdate(match)
  
  class AdminMigration(LoggedInHandler):
    def get(self):
      self._require_admin()
      path = os.path.join(os.path.dirname(__file__), '../../templates/admin/migration.html')
      self.response.out.write(template.render(path, self.template_values))
  
  
  class AdminMigrationAddMatchYear(LoggedInHandler):
    def get(self):
      self._require_admin()
      for year in range(1992, 2016):
        event_keys = Event.query(Event.year == year).fetch(keys_only=True)
        for event_key in event_keys:
          deferred.defer(add_year, event_key, _queue="admin")
      self.response.out.write(event_keys)
  
subject: fix missing import