Inventory Management System Backend with any framework of python

The Goal of this project is to develop the backend of an Inventory Management System using the Flask web framework. The system shall contain RESTful APIs for managing inventory items, implementing CRUD operations $($Create$,$ Read, Update, Delete$)$ with valid input validation and user authentication using cookies and sessions to track logged$-$in users and also error handling.

Functional Requirements:

$1.$ User Authentication with Sessions and Cookies:

$-$ User Login: Implement user login functionality where a user can log in by providing credentials $($username and password$).$ Use sessions and cookies to track and maintain login states.

$-$ User Registration: Allow new users to register by providing a username, password, and email.

$-$ Session Management: Use Flask's session management to store user session data securely$.$

$-$ Logout: Implement logout functionality that clears the session and removes authentication cookies.

$2.$ CRUD Operations for Inventory:

$-$ Create Inventory Item: Allow the creation of new inventory items with fields like item name, description, quantity, and price. With auto creation of ID

$-$ Read Inventory Items: Provide APIs to list all inventory items or fetch a single item based on its ID$.$

$-$ Update Inventory Item: Allow the modification of an inventory item's details $($name$,$ quantity, price, etc.$).$by id

$-$ Delete Inventory Item: Enable deletion of an inventory item by ID

$3.$ User$-$Specific Inventory Management:

$-$ Each logged$-$in user will have their own inventory items, ensuring that users can only access and modify their own data.

$-$ Use sessions to ensure that only authenticated users can access inventory$-$related CRUD operations.

$4.$ Session and Cookie Security:

$-$ Secure user sessions with encryption $($Flask secret key$).$

$-$ Implement proper session expiration handling to automatically log out inactive users

$5.$ Testing of API using postman