# Complete - m-api-centered-proto-socket-rail/04+02_backtest_rail

## 완료 일시

2026-05-30

## 요약

Backtest API-to-worker proto-socket rail follow-up completed after 2 review loops; G08 failed on error semantics, empty compare, production start availability, and evidence trust, and G09 passed with typed `ErrorInfo` responses plus completed verification evidence.

## 루프 이력

| Plan | Review | Verdict | 메모 |
|------|--------|---------|------|
| `plan_cloud_G08_0.log` | `code_review_cloud_G08_0.log` | FAIL | Expected handler errors could become proto-socket timeouts, compare empty semantics drifted, production start exposed placeholder pending runs, and verification evidence was incomplete. |
| `plan_cloud_G09_1.log` | `code_review_cloud_G09_1.log` | PASS | Backtest error responses, empty compare semantics, production start availability, and verification evidence were corrected. |

## 구현/정리 내용

- Added additive `ErrorInfo` fields to backtest response messages and regenerated Go/Dart contracts.
- Updated API and worker backtest handlers so expected validation, unavailable, not-found, timeout, and backend failures return typed response payloads instead of Go handler errors.
- Unified `CompareBacktestRuns` empty request semantics as a no-op empty response while preserving empty-id validation.
- Kept production `StartBacktest` unavailable until a real executable backtest adapter is wired, avoiding permanently pending placeholder runs.
- Added API and worker socket-level regression coverage for typed error responses without request timeout.

## 최종 검증

- `bin/contracts-gen` - PASS; no output, recorded in `code_review_cloud_G09_1.log`.
- `bin/contracts-check` - PASS; no output, recorded in `code_review_cloud_G09_1.log`.
- `go test ./packages/contracts/gen/go/...` - PASS; `alt/v1` reported no test files.
- `go test ./services/api/...` - PASS; API packages passed or reported no test files.
- `go test ./services/worker/...` - PASS; worker packages passed or reported no test files.
- `cd apps/client && flutter test` - PASS; dependency resolver warnings were printed and Flutter reported `All tests passed!`.
- API/worker smoke - PASS by recorded substitute evidence; socket-level tests cover invalid and unavailable backtest paths without timeout.

## 잔여 Nit

- 없음

## 후속 작업

- 없음
