Phase 3 Delta Comparison Engine Plan

Phase 3 Delta Comparison Engine Plan

Strategy (WHY)

QA teams need side-by-side comparison of two runs (reliability + performance) with deterministic regression/improvement labels — especially for load and multi-stage cycles.

Implementation (HOW — use these as source of truth)

Layer	Detail
Metric semantics	Delta Comparison Policy
Core service	testo_core/services/delta_service.py
CLI	Command Reference § testo diff / testo summary
API	GET /api/v1/analytics/delta
React	frontend/src/features/compare/

Do not duplicate the direction table here — it lives in Delta Comparison Policy.

Release gate

Release Checklist - Phase 3 Delta Engine

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Context & Links: Delta Comparison Policy, Architecture Overview, Product Roadmap § Phase 3: Enterprise UI & Analytics

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Generated from docs/Specs & ADRs/Phase 3 Delta Comparison Engine Plan.md. Edit it there; changes made in the wiki are overwritten.