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app/__init__.py

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+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+def create_app():
+    app = Flask(__name__)
+    app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///todo.db"
+    app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
+
+    db.init_app(app)
+
+    # Импорт и регистрация маршрутов
+    with app.app_context():
+        from . import routes
+        db.create_all()
+
+    return app