experiments in model and firm py

orm.py

@@ -1,8 +1,8 @@
 # -*- coding: utf-8 -*-
 from sqlalchemy import create_engine, inspect
 from sqlalchemy.ext.declarative import declarative_base
-from sqlalchemy import (Column, Integer, DECIMAL, String, ForeignKey, BigInteger,
+from sqlalchemy import (Column, Integer, DECIMAL, String, ForeignKey,
-                        DateTime, PickleType, Boolean, Text)
+                        BigInteger, DateTime, PickleType, Boolean, Text)
 from sqlalchemy.sql import func
 from sqlalchemy.orm import relationship, Session
 from sqlalchemy.pool import NullPool