old_contents: from flask import Flask
  from app.controller import cashier
  from app.controller import category
  from app.controller import dashboard
  from app.controller import item
  from app.controller import user
  from app.controller import view
  
  
  def startup_app():
      app = Flask(__name__)
  
      # URL末尾のスラッシュを含めなくて良いようにする
      app.url_map.strict_slashes = False
      blueprints = [
          cashier.bp,
          category.bp,
          dashboard.bp,
          item.bp,
          user.bp,
          view.bp
      ]
  
      for bp in blueprints:
          app.register_blueprint(bp)
      return app
  
new_contents: from flask import Flask
  from app.controller import cashier
  from app.controller import category
  from app.controller import daily_sales
  from app.controller import dashboard
  from app.controller import item
  from app.controller import user
  from app.controller import view
  
  
  def startup_app():
      app = Flask(__name__)
  
      # URL末尾のスラッシュを含めなくて良いようにする
      app.url_map.strict_slashes = False
      blueprints = [
          cashier.bp,
          category.bp,
          daily_sales.bp,
          dashboard.bp,
          item.bp,
          user.bp,
          view.bp
      ]
  
      for bp in blueprints:
          app.register_blueprint(bp)
      return app
  
subject: add daily sales api