old_contents: from google.appengine.ext import db
  from google.appengine.api import users
  from time import mktime
  
  class User(db.Model):
      google_user = db.UserProperty()
      nickname = db.StringProperty()
      nickname_lower = db.StringProperty()
      deleted = db.BooleanProperty(default=False)
      
      def fetch_feeds(self):
      	return {}
      
      def to_struct(self):
      	if self.deleted:
  	    	return None
      	else:
      		return {
      			'id': self.key().id(),
      			'email': self.google_user.email(),
      			'nickname': self.nickname
      		}
  
  class InviteToken(db.Model):
      email = db.StringProperty()
      token = db.StringProperty()
  
  class InputFeed(db.Model):
      # parent(User)
      title = db.StringProperty()
      url = db.StringProperty()
      time_fetched = db.DateTimeProperty()
      deleted = db.BooleanProperty()
  
      def fetch_entries(self):
      	return []
  
      def to_struct(self):
  		return {
  			'title': self.title,
  			'url': self.url,
  			'time_fetched': mktime(self.time_fetched.timetuple()),
  		}
  
  class Entry(db.Model):
      #parent(InputFeed)
      id = db.StringProperty()
      title = db.StringProperty()
      content = db.TextProperty()
      link = db.TextProperty()
      time_published = db.DateTimeProperty()
      published = db.BooleanProperty()
      tags = db.ListProperty(db.Key)
      user = db.ReferenceProperty(reference_class=User)
  
      def to_struct(self, include_tags=False):
      	tags = []
      	if include_tags:
      		for tag in db.get(self.tags):
  				tags.append(tag.to_struct())
      	
      	return {
      		'id': self.id,
      		'title': self.title,
      		'content': self.summary,
      		'link': self.link,
      		'time_published': mktime(self.time_published.timetuple()),
      		'published': self.published,
      		'tags': tags,
      	}
  
  class Tag(db.Model):
      #parent(User)
      title = db.StringProperty()
      title_lower = db.StringProperty()
      entry_count = db.IntegerProperty(default=0)
      entries = db.ListProperty(db.Key)
  
      def tag_entry(self, entry):
      	self.entry_count += 1
      	entry.tags.append(self.Key())
      	entry.save()
      	self.save()
  
      def to_struct(include_entries=False):
      	entries = []
      	if include_entries:
      		for entry in entries:
      			entries.append(entry.to_struct())
  
  		return {
  			'title': self.title,
  			'entry_count': self.entry_count,
  			'entries': entries,
  		}
  
new_contents: from google.appengine.ext import db
  from google.appengine.api import users
  from time import mktime
  
  class User(db.Model):
      google_user = db.UserProperty()
      nickname = db.StringProperty()
      nickname_lower = db.StringProperty()
      deleted = db.BooleanProperty(default=False)
      
      def fetch_feeds(self):
      	return {}
      
      def to_struct(self):
      	if self.deleted:
  	    	return None
      	else:
      		return {
      			'id': self.key().id(),
      			'email': self.google_user.email(),
      			'nickname': self.nickname
      		}
  
  class InviteToken(db.Model):
      email = db.StringProperty()
      token = db.StringProperty()
  
  class InputFeed(db.Model):
      # parent(User)
      title = db.StringProperty()
      url = db.StringProperty()
      time_fetched = db.DateTimeProperty(auto_now_add=True)
      deleted = db.BooleanProperty()
  
      def fetch_entries(self):
      	return []
  
      def to_struct(self):
  		return {
  			'title': self.title,
  			'url': self.url,
  			'time_fetched': mktime(self.time_fetched.timetuple()),
  		}
  
  class Entry(db.Model):
      #parent(InputFeed)
      id = db.StringProperty()
      title = db.StringProperty()
      content = db.TextProperty()
      link = db.TextProperty()
      time_published = db.DateTimeProperty()
      published = db.BooleanProperty()
      tags = db.ListProperty(db.Key)
      user = db.ReferenceProperty(reference_class=User)
  
      def to_struct(self, include_tags=False):
      	tags = []
      	if include_tags:
      		for tag in db.get(self.tags):
  				tags.append(tag.to_struct())
      	
      	return {
      		'id': self.id,
      		'title': self.title,
      		'content': self.summary,
      		'link': self.link,
      		'time_published': mktime(self.time_published.timetuple()),
      		'published': self.published,
      		'tags': tags,
      	}
  
  class Tag(db.Model):
      #parent(User)
      title = db.StringProperty()
      title_lower = db.StringProperty()
      entry_count = db.IntegerProperty(default=0)
      entries = db.ListProperty(db.Key)
  
      def tag_entry(self, entry):
      	self.entry_count += 1
      	entry.tags.append(self.Key())
      	entry.save()
      	self.save()
  
      def to_struct(include_entries=False):
      	entries = []
      	if include_entries:
      		for entry in entries:
      			entries.append(entry.to_struct())
  
  		return {
  			'title': self.title,
  			'entry_count': self.entry_count,
  			'entries': entries,
  		}
  
subject: Use auto_now_add for InputFeed.time_fetched