id = Column(Integer, Sequence('idseq'), primary_key=True)
email = Column(String, unique=True)
ip_addr = Column(String)
created_date = Column(TIMESTAMP(timezone=True), default=datetime.datetime.
    utcnow)
modified_date = Column(TIMESTAMP(timezone=True), default=datetime.datetime.
    utcnow)
Index('user_index', Users.c.email, Users.c.ip_addr)
Defining Indexes in SqlAlchemy with Alembic