Inserting data right after create table in SqlAlchemy

Question

I'm creating my tables with SqlAlchemy and have a table called UserTypes

id | type

0 | Owner

1 | Customer

In my User table i take usertype id as foreign key. And whenever i want to create a user, i want to assign usertype default 0. But my usertype table is empty, so i want to fill this table right after its created with SqlAlchemy, and locked for further insertions. Question is can i insert

Here is my User and UserType modals.

class User(Model):       

    id = Column(db.Integer, primary_key=True)
    email = Column(db.String(64), unique=True, index=True)
    username = Column(db.String(15), unique=True, index=True)
    name = Column(db.String(64))
    password_hash = Column(db.String(128))
    usertype_id = Column(db.Integer, db.ForeignKey('user_types.id'), default=DEFAULT_USERTYPE)

and

class UserType(db.Model):

   __tablename__ = 'user_types'
   id = db.Column(db.Integer, primary_key=True)
   name = db.Column(db.String(64), index=True, unique=True)   
   users = db.relationship('User', backref='user_types', lazy='dynamic')