app/__init__.py

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

# create database obj globallysecrect_key
db = SQLAlchemy()

def create_app():
    app = Flask(__name__)
    
    
    app.config['SECRET_KEY'] = 'secret_key'
    app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///todo.db'
    app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False   
    
    db.init_app(app)
    
    from app.routes.auth import auth_bp
    from app.routes.tasks import tasks_bp
    app.register_blueprint(auth_bp)
    app.register_blueprint(tasks_bp)

    return app