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This application is a simple todo list manager built using Next.js and Neon Postgres. It allows users to create, update, and delete tasks, providing a straightforward interface for managing daily activities. To use the app, users can add new tasks by entering text into an input field and clicking the add button. Each task can be marked as completed or deleted. The app supports a demo mode, which allows users to interact with the interface without a database connection, simulating the addition and management of tasks. The application is built with several technologies, including TypeScript for type safety, Tailwind CSS for styling, and Next.js for server-side rendering and API routes. The Neon database is utilized for persistent storage of todos, with a connection pool established for efficient database interactions. Key features of the app include: - A responsive user interface that adapts to different screen sizes. - Support for dark mode, allowing users to switch themes based on their preferences. - Optimistic UI updates, which provide immediate feedback when tasks are added, toggled, or deleted, enhancing the user experience. - A demo mode that showcases the app's functionality without requiring a database connection, making it accessible for testing and demonstration purposes. - Error handling for database operations, ensuring that users receive feedback if something goes wrong during interactions with the database. Overall, this todo app serves as a practical example of building a full-stack application with modern web technologies, emphasizing user experience and efficient data management.