new_contents: import arrow
  import boto3
  import uuid
  from bloop import (Engine, Column, Integer, DateTime, UUID,
                     GlobalSecondaryIndex, String)
  
  # ================================================
  # Model setup
  # ================================================
  
  session = boto3.session.Session(profile_name="test-user-bloop")
  engine = Engine(session=session)
  
  
  class Account(engine.model):
      class Meta:
          read_units = 5
          write_units = 2
  
      id = Column(UUID, hash_key=True)
      name = Column(String)
      email = Column(String)
      by_email = GlobalSecondaryIndex(
          hash_key='email', projection='keys_only',
          write_units=1, read_units=5)
  
  
  class Tweet(engine.model):
      class Meta:
          write_units = 10
      account = Column(UUID, hash_key=True)
      id = Column(String, range_key=True)
      content = Column(String)
      date = Column(DateTime(timezone='EU/Paris'))
      favorites = Column(Integer)
  
      by_date = GlobalSecondaryIndex(
          hash_key='date', projection='keys_only')
  
  engine.bind()
  
  
  # ================================================
  # Usage
  # ================================================
  
  account = Account(
      id=uuid.uuid4(), name='@garybernhardt',
      email='REDACTED')
  tweet = Tweet(
      account=account.id, id='616102582239399936',
      content='today, I wrote a type validator in Python, as you do',
      favorites=9,
      date=arrow.now())
  
  engine.save([account, tweet])
  
subject: Add tweet example from quickstart