text: import sqlite3
  from db import db
  
  class UserModel(db.Model):
  	__tablename__ = 'users'
  
  	id = db.Column(db.Integer, primary_key=True)
  	username = db.Column(db.String(80))
  	password = db.Column(db.String(80))
  
  	def __init__(self, username, password):
  		self.username = username
  		self.password = password
  
  	def upsert(self):
  		db.session.add(self)
  		db.session.commit()
  
  	@classmethod
  	def find_by_username(cls, username):
  		return cls.query.filter_by(username=username).first()
  
  	@classmethod
  	def find_by_id(cls, _id):
  		return cls.query.filter_by(id=_id).first()
  