web app 作成 flask について

>>> db.create_all()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/takuyasuzuki/miniforge3/envs/ds_env/lib/python3.9/site-packages/flask_sqlalchemy/extension.py", line 868, in create_all
    self._call_for_binds(bind_key, "create_all")
  File "/Users/takuyasuzuki/miniforge3/envs/ds_env/lib/python3.9/site-packages/flask_sqlalchemy/extension.py", line 839, in _call_for_binds
    engine = self.engines[key]
  File "/Users/takuyasuzuki/miniforge3/envs/ds_env/lib/python3.9/site-packages/flask_sqlalchemy/extension.py", line 628, in engines
    app = current_app._get_current_object()  # type: ignore[attr-defined]
  File "/Users/takuyasuzuki/miniforge3/envs/ds_env/lib/python3.9/site-packages/werkzeug/local.py", line 513, in _get_current_object
    raise RuntimeError(unbound_message) from None
RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that needed
the current application. To solve this, set up an application context
with app.app_context(). See the documentation for more information.
>>> 

from flask import Flask, render_template
from flask_sqlalchemy import SQLAlchemy



app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///todo.db'
db = SQLAlchemy(app)



class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(30), nullable=False)
    detail = db.Column(db.String(100))
    due = db.Column(db.DateTime, nullable=False)

@app.route('/')
def index():
    return render_template('index.html')

if __name__ == "__main__":
    app.run(debug=True)

with app.app_context():
        init_db()