old_contents: from app_factory.create_app import db
  from models import User
  from forms import RegistrationForm, LoginForm
  
  
  def load_user(user_id):
      return User.query.filter_by(id=user_id).first()
  
  
  def login(request):
      form = LoginForm.from_json(request.form)
      if request.method == 'POST' and form.validate():
          return True
  
new_contents: from models import User
  from forms import LoginForm
  
  
  def load_user(user_id):
      """Returns a user from the database based on their id"""
      return User.query.filter_by(id=user_id).first()
  
  
  def login(request):
      """Handle a login request from a user."""
      form = LoginForm.from_json(request.form)
      if request.method == 'POST' and form.validate():
          return True
  
subject: Clean up unused imports and add docstrings