class InviteCode(db.Model):
    __tablename__ = 'invite_code'
    id = db.Column(db.BigInteger, primary_key=True, autoincrement=True)
    code = db.Column(db.VARCHAR(32), nullable=False)
    created_at = db.Column(db.TIMESTAMP(True), nullable=False)
    status = db.Column(db.VARCHAR(1), nullable=False, server_default='0')
    user_id = db.Column(db.BigInteger, nullable=True, server_default=None)

    __table_args__ = (
        Index('idx_invite_code', func.lower(code), unique=True),   <------  not 
work, migrations file have not this operation
        Index('idx_invite_userid', 'user_id', unique=False),
    )

    def __init__(self, code=None, created_at=None, status=None, user_id=None):
        self.code = code
        self.created_at = created_at if created_at is not None else 
arrow.utcnow()
        self.status = status
        self.user_id = user_id



-- 
SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper

http://www.sqlalchemy.org/

To post example code, please provide an MCVE: Minimal, Complete, and Verifiable 
Example.  See  http://stackoverflow.com/help/mcve for a full description.
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