text: from flask_simplelogin import SimpleLogin
  from werkzeug.security import check_password_hash, generate_password_hash
  
  from project_name.ext.database import db
  from project_name.models import User
  
  
  def verify_login(user):
      """Validates user login"""
      username = user.get("username")
      password = user.get("password")
      if not username or not password:
          return False
      existing_user = User.query.filter_by(username=username).first()
      if not existing_user:
          return False
      if check_password_hash(existing_user.password, password):
          return True
      return False
  
  
  def create_user(username, password):
      """Creates a new user"""
      if User.query.filter_by(username=username).first():
          raise RuntimeError(f"{username} already exists")
      user = User(username=username, password=generate_password_hash(password))
      db.session.add(user)
      db.session.commit()
      return user
  
  
  def init_app(app):
      SimpleLogin(app, login_checker=verify_login)
  