Design a simple greeting-card web app

Problem Statement

Design a web-based greeting-card application that allows users to create, personalize, and share digital cards. The core workflow involves a user choosing a template, adding a custom message, and generating a unique URL to send to a recipient.

Functional Requirements

1. Users can select from a pre-defined set of card templates.
2. Users can input a custom text message to be displayed on the card.
3. The system should generate a unique, shareable link for each card.
4. Recipients can view the card by navigating to the unique link.

Non-Functional Requirements

1. The system should be able to handle roughly 10,000 creations and 50,000 views per day.
2. Low latency for card viewing is a priority.
3. The design should account for data persistence and basic security (e.g., preventing unauthorized edits).

Deliverables

• Provide a high-level architecture diagram or description.
• Define the API endpoints required for the MVP.
• Outline the database schema for cards and templates.
• Explain the trade-offs in your storage choice (e.g., SQL vs. NoSQL) for card content.