CLI

Prompt: Create a complete command-line application using Python. The application should solve this problem: [Clearly describe the problem in 1–2 sentences.] Core features: [Feature 1 with exact behavior] [Feature 2 with exact behavior] [Feature 3 with exact behavior] Technical requirements: Use a clean and modular structure with functions or classes Use argparse (or click if specified) for CLI input handling Store data using [JSON / SQLite / file system] Handle edge cases and invalid inputs properly Output requirements: Provide full working code in a single file (or structured files if needed) Include setup and run instructions Show example commands and expected output Keep the code production-ready, not a prototype Constraints: Do not use unnecessary external libraries Prioritize readability and maintainability