old_contents: """
  """
  import os
  import json
  from sqlalchemy import (create_engine, Table, Column, String, Integer,
                          PickleType, Boolean, DateTime, Float, Text,
                          MetaData, select, ForeignKey, bindparam,
                          delete, and_)
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.sql import func
  from config import Configuration
  
  engine = create_engine(Configuration.SQLALCHEMY_DATABASE_URI, echo=True)
  
  engine.execute('alter table post add column "start" type timestamp with time zone')
  engine.execute('alter table post add column "end" type timestamp with time zone')
  engine.execute('alter table post add column updated timestamp')
  
  
  
new_contents: """
  """
  import os
  import json
  from sqlalchemy import (create_engine, Table, Column, String, Integer,
                          PickleType, Boolean, DateTime, Float, Text,
                          MetaData, select, ForeignKey, bindparam,
                          delete, and_)
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.sql import func
  from config import Configuration
  
  engine = create_engine(Configuration.SQLALCHEMY_DATABASE_URI, echo=True)
  
  engine.execute('alter table post add column start_utc type timestamp')
  engine.execute('alter table post add column end_utc type timestamp')
  engine.execute('alter table post add column start_utcoffset type interval')
  engine.execute('alter table post add column end_utcoffset type interval')
  engine.execute('alter table post add column updated timestamp')
  
  
  
subject: add utcoffset columns in the migration