old_contents: from ..factory.config import ConfigFactory
  from ..exceptions 	  import DuplicateDocument
  from urllib.parse 	  import quote_plus
  import arrow
  import pymongo
  
  class PostSaver:
  	def save(self, post=None):
  		""" Exceptions:
  			- AssertionError
  		"""
  		assert post is not None, "post is not defined."
  
  		config = ConfigFactory.get_config(ConfigFactory.DATABASE)
  		config = config.get("azure-document-db")
  
  		conn = pymongo.MongoClient(config["connectionString"])
  		db   = conn[config["database"]]
  		db[config["collection"]].create_index("permalink", background=True)
  
  		if db[config["collection"]].count({"permalink": post.permalink}) > 0:
  			raise DuplicateDocument("Ops! Duplicate document!")
  		db[config["collection"]].insert(post.to_dict())
  		conn.close()
new_contents: from ..factory.config import ConfigFactory
  from ..exceptions 	  import DuplicateDocument
  from urllib.parse 	  import quote_plus
  import arrow
  import pymongo
  
  class PostSaver:
  	def save(self, post=None):
  		""" Exceptions:
  			- AssertionError
  		"""
  		assert post is not None, "post is not defined."
  		post._insert_time = arrow.utcnow().datetime
  		
  		config = ConfigFactory.get_config(ConfigFactory.DATABASE)
  		config = config.get("azure-document-db")
  
  		conn = pymongo.MongoClient(config["connectionString"])
  		db   = conn[config["database"]]
  		db[config["collection"]].create_index("permalink", background=True)
  
  		if db[config["collection"]].count({"permalink": post.permalink}) > 0:
  			raise DuplicateDocument("Ops! Duplicate document!")
  		db[config["collection"]].insert(post.to_dict())
  		conn.close()
subject: add insert time stats