fix: parallelize analytics queries with Promise.all to prevent 504 timeouts

[sachin-mahato25]

Closes #223

Problem

The analytics endpoint ran 7 database queries sequentially, causing
the Vercel serverless function to exceed the 10-second timeout limit
for classrooms with 50+ users, resulting in 504 Gateway Timeout errors.

Fix

Wrapped all 7 independent queries in Promise.all() so they execute
in parallel. Response time is now determined by the slowest single
query instead of the sum of all queries.

Changes

• app/api/analytics/route.ts — parallelized all analytics queries

[vercel]

@sachin-mahato25 is attempting to deploy a commit to the Karan Mani Tripathi 's projects Team on Vercel.

A member of the Team first needs to authorize it.

[sachin-mahato25]

Hey @knoxiboy!
I've investigated the issue and found that the GET /api/analytics
endpoint was running 7 database queries sequentially, causing the total response
time to exceed Vercel's 10-second timeout limit for classrooms with 50+ users.

Fixed this by wrapping all 7 independent queries in Promise.all() so they now
execute in parallel, reducing response time from the sum of all queries to just
the slowest single query. No changes to API response shape or existing functionality.

PR has been submitted for your review. Looking forward to your feedback! 🙏

[knoxiboy]

Technical Review

Hi @sachin-mahato25! Thank you for your contribution to DoubtDesk.

The code changes look good. Before we can complete the technical review, approve, and merge this pull request, we have one final requirement for all contributors: Please star the DoubtDesk repository.

Once you have starred the repository, please drop a comment here saying "done" (or we will automatically detect it) and we will proceed with approving and merging your PR. Thank you.

[sachin-mahato25]

@knoxiboy Done! ⭐ I have starred the DoubtDesk repository. Thank you for reviewing my contribution.

[knoxiboy]

Automated review: Thank you for starring the repository! The PR is approved.\n\nNote: This PR currently has merge conflicts with the main branch. Please resolve the merge conflicts so we can complete the merge!