TEST-017: Performance Regression Suite

[ajitpratap0]

Summary

Create performance regression test suite to track and prevent performance degradation over time.

Problem

No tracking of performance over time - risk of performance regressions going unnoticed until production.

Action Items

1. Create performance test suite with baselines:
   • Simple SELECT: < 280ns (current benchmark)
   • Complex query: < 1μs
   • Window function: < 1.5μs
   • CTE: < 2μs
   • Tokenization: 8M+ tokens/sec
   • End-to-end: 1.38M+ ops/sec sustained
2. Store performance baselines in repository
3. Alert on 20%+ degradation in any benchmark
4. Track performance trends over time
5. Generate performance comparison reports

Acceptance Criteria

• Performance baselines established for all critical operations
• CI tracks performance trends
• Alerts on 20%+ regression
• Performance comparison in PR comments
• Historical performance graphs

Technical Details

Priority: Medium
Effort: Medium (16h)
Phase: Phase 2 - Testing & Coverage
Dependencies: TEST-007 (Benchmark regression testing in CI)

Related

Validates production claim: "1.38M+ operations/second sustained, up to 1.5M peak"