Real-Time Student Performance Dashboard API Integration

Design a modular Express.js microservice that aggregates student performance data from multiple learning management systems using GraphQL. Create a normalized data schema that can handle disparate grade formats from Canvas, Blackboard, and Moodle. Implement robust error handling for API disconnections, with automatic retry mechanisms and comprehensive logging. Include rate limiting and implement JWT authentication with role-based access controls distinguishing between student, teacher, and administrator views.