Shravya - Phase4 - Class Performance Report

[ShravyaKudlu]

Description

Implements # (WBS) phase 4 class performance report
Result:
Adds backend capability for generating aggregated class-level reports,
enabling educators and PMs to compare and visualize group-level performance trends.

Returns: class-level analytics including per-student summaries.
Implement aggregation queries using existing performance and activity datasets.
Ensure efficient data retrieval through pagination or caching for large classes.

Main changes explained:

Features:

Aggregate performance data for all students within a class or group.
Include metrics such as:

1. Average completion rate per topic.
2. Distribution of performance levels (e.g., % Excellent / Satisfactory / Needs Improvement).
3. Comparative analytics between students.
4. Support filtering by subject, time range, or educator.

How to test:

1. check into current branch
2. do npm install and ... to run this PR locally
3. Clear site data/cache
4. log as admin user
5. Endpoint: GET /educator/reports/class/:classId
6. Verify the functionality

Screenshots or videos of changes:

Note:

For Now I have used the build in database and connected to my mongoDB schema and with my own DB name added
Please update mongoDB add your schema and test it.