saqib mirandClaude Sonnet 5
20e5493798
Documents implementation-time findings in the requirements checklist: all three suspected races were confirmed real then fixed, the ticket-status mechanism needed no fix, a real pre-existing test-infrastructure issue (throwaway DB ticket-code collisions at high accumulated volume) was found and resolved by resetting the throwaway database and replaying its full migration history, two full-suite-only integration failures were confirmed as pre-existing cross-file contamination (not a regression), and the load-test tooling surfaced a real Anthropic API cost consideration for ticket creation itself. All 23 tasks marked complete. Full quality gate green: typecheck, lint, architecture check, full unit suite (119/119), full integration suite against a freshly reset throwaway database (122/124 — the 2 failures are the project's own already-accepted MinIO baseline), and all 6 concurrency test files (11/11). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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4.8 KiB
Specification Quality Checklist: Load and Concurrency Testing
Purpose: Validate specification completeness and quality before proceeding to planning Created: 2026-09-09 Feature: spec.md
Content Quality
- No implementation details (languages, frameworks, APIs)
- Focused on user value and business needs
- Written for non-technical stakeholders
- All mandatory sections completed
Requirement Completeness
- No [NEEDS CLARIFICATION] markers remain
- Requirements are testable and unambiguous
- Success criteria are measurable
- Success criteria are technology-agnostic (no implementation details)
- All acceptance scenarios are defined
- Edge cases are identified
- Scope is clearly bounded
- Dependencies and assumptions identified
Feature Readiness
- All functional requirements have clear acceptance criteria
- User scenarios cover primary flows
- Feature meets measurable outcomes defined in Success Criteria
- No implementation details leak into specification
Notes
- This feature was scoped from a targeted codebase audit (not guesswork) confirming which concurrency guarantees already exist untested (ticket optimistic concurrency) versus which have no protection at all today (assignment double-assignment, SLA pause/resume, escalation idempotency) — see spec.md's own Assumptions section.
- Per this project's own roadmap convention, exact load-test pass/fail thresholds are left as an
explicit
OPEN BUSINESS DECISION(FR-009) rather than invented — this is intentional, not a gap requiring [NEEDS CLARIFICATION]. - All items pass; no revision iterations were needed.
Implementation-time findings
- All three suspected real races were confirmed real, then fixed. Before the fix, firing 20
genuinely concurrent assignment attempts at the same ticket reliably threw an unhandled
Postgres unique-constraint error once the new
assignments_one_current_per_ticketpartial index was in place (proving the race existed even before the retry logic was added) — after the fix (bounded retry with jitter inAssignmentRepository.createAssignment), it holds consistently across 10 repeated runs. Escalation idempotency was proven the same way: the database-level unique-violation is visibly caught and absorbed in the logs during the test, confirming the fix actually engages under a genuine race rather than sitting untested. - The ticket-status optimistic-concurrency mechanism (User Story 4) needed no fix — proven correct on the first run, exactly as research.md's Assumptions predicted.
- A real, pre-existing test-infrastructure issue was found and resolved along the way: the
throwaway integration-test Postgres database had accumulated a very large number of tickets
over this project's long development history, and the ticket-code generator's own
documented "rare race between two concurrent creates" (a read-then-increment sequence number
scoped by code prefix) became a frequent occurrence at that accumulated volume — manifesting
as dozens of unrelated integration-test failures when the full suite ran, unrelated to any
change in this feature. Confirmed by direct reproduction (a debug run showing the literal
Unique constraint failed on the fields: (code)error) and by re-running the exact same suite cleanly (122/124 passing, matching the project's known accepted baseline) after dropping and recreating the throwaway database and replaying its full migration history (prisma migrate deploy, 12 migrations including this feature's own). This is a test- infrastructure hygiene finding, not a defect in this feature's own code. - Two additional integration-test failures seen only in the full-suite run (never in isolation) were confirmed to be pre-existing cross-file contamination inherent to this suite's shared-database, non-fully-isolated hierarchy/agent scoping (already acknowledged in comments elsewhere in the suite, e.g. sla-escalation-flow.test.ts's own note about a wildcard SLA policy leaking across concurrently-running files) — re-running the two affected files together in isolation passed cleanly (13/13), ruling out this feature's own changes as the cause.
- The autocannon-based load-test tooling (User Story 5) surfaced a real, non-obvious cost consideration: ticket creation asynchronously triggers a real, billed Anthropic API call for that ticket's first AI diagnosis turn (005-ai-support) — this applies to both the ticket-creation and AI-support-flow load scripts, not only the latter as initially assumed. All three scripts were run once at a small, explicitly bounded scale (confirmed with the project owner beforehand) rather than an open-ended duration, specifically to keep this real cost small and predictable.