Design a Tagging Service

Functional Requirements

1. Tag Creation

   • Users should be able to create new tags.
   • Tags should be unique and descriptive.

2. Tag Assignment

   • Users can assign tags to various resources (e.g., articles, images, videos).
   • Support for assigning multiple tags to a single resource.

3. Tag Removal

   • Users should be able to remove tags from resources.
   • Users should be able to delete tags entirely from the system.

4. Tag Search

   • Users can search for resources based on tags.
   • Support for partial and full-text search.

5. Tag Management

   • Provide a dashboard for users to view and manage their tags.
   • Support for bulk operations (e.g., bulk tag assignment, removal).

6. Tag Analytics

   • Provide analytics on tag usage (e.g., most popular tags, tag trends over time).

7. Access Control

   • Ensure that only authorized users can create, modify, or delete tags.

8. Integration

   • Provide APIs for integration with other services and systems.

Non-Functional Requirements

1. Scalability

   • The system should handle a large number of tags and resources efficiently.
   • Support for horizontal scaling to manage increased load.

2. Performance

   • Fast response times for tag creation, assignment, and search operations.
   • Low latency for API responses.

3. Reliability

   • Ensure high availability of the tagging service.
   • Implement redundancy to prevent data loss.

4. Security

   • Secure access to the tagging service with authentication and authorization.
   • Protect against common vulnerabilities (e.g., SQL injection, XSS).

5. Consistency

   • Ensure data consistency across distributed systems.
   • Implement eventual consistency where necessary.

6. Flexibility

   • Support for different types of resources and tags.
   • Ability to adapt to changing business requirements.

7. Extensibility

   • Design the system to allow for future feature additions without major overhauls.

8. Monitoring and Logging

   • Implement monitoring to track system performance and usage.
   • Provide detailed logging for troubleshooting and auditing purposes.