models.py

from extensions import db

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)

class Character(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(80), unique=True, nullable=False)
    level = db.Column(db.Integer, nullable=False)
    class_ = db.Column(db.String(80), nullable=False)
    health = db.Column(db.Integer, nullable=False)
    strength = db.Column(db.Integer, nullable=False)
    agility = db.Column(db.Integer, nullable=False)