⚡ Bolt: [performance improvement] Optimize array filtering with Set lookups

[xb1g]

💡 What: Replaced O(N*M) array .includes() calls inside .filter() loops with pre-computed O(1) Set lookups in grading and assignments API routes.
🎯 Why: To eliminate nested O(N^2) complexity bottlenecks when processing arrays, dramatically improving execution speed for large datasets (like classrooms with many students and assignments).
📊 Impact: Reduces lookup complexity from O(N) to O(1) per iteration, leading to significant latency reduction when filtering missing users or nodes in large cohorts.
🔬 Measurement: Verify by benchmarking response times of the /api/classrooms/[id]/grading and /api/assignments/[id]/nodes routes under heavy load with large classroomMembers and submissionUserIds arrays.

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PR created automatically by Jules for task 3984100059902385752 started by @xb1g

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Pull request overview

This PR optimizes two Next.js API routes by replacing repeated Array.includes() membership checks inside .filter() loops with precomputed Set lookups, reducing worst-case lookup cost when processing large classrooms/assignments.

Changes:

• In /api/classrooms/[id]/grading, precomputes a Set of submissionUserIds and uses .has() to find classroom members missing from submissions.
• In /api/assignments/[id]/nodes, precomputes a Set of existingNodeIds and uses .has() to find missing node IDs before inserting assignment nodes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
app/api/classrooms/[id]/grading/route.ts	Uses a Set for membership checks when computing missingUserIds to avoid repeated linear .includes() lookups.
app/api/assignments/[id]/nodes/route.ts	Uses a Set for membership checks when computing missingNodes to avoid repeated linear .includes() lookups.

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	web	993d271	May 11 2026, 06:32 PM