thread-master/docs/product/brand-product-radar/tasks/T774-product-match-race-metering-regression.md

T774 — product match race metering regression

Status: todo
Milestone: M7 · Phase D
Kind: test · Est. change: ~190 lines

Goal

證明多 worker／重試不重複 ProductMatch 或 AI 計費，Sweep counters 與實際資料可對帳。

Depends on

• T770–T773

Inputs

• radar worker/sweep/repository/usage fake harness
• ../spec.md §4.2、§5.5、§8、驗收 #12

Outputs

路徑	動作	說明
apps/backend/internal/module/radar/usecase/product_race_meter_test.go	add	same/different product worker race、retry
apps/backend/internal/module/radar/usecase/sweep_counter_test.go	edit/add	evaluated/merged/rejected/truncated reconciliation
usage integration tests	edit	radar.product_fit exactly-once semantics

Behavior

• 同 (opportunity, product) 最多一次適配計費。
• 不同 Product 可各計一次但仍一 Opportunity。
• job guarded update、Redis lock value=workerID 規則不變。

Out of scope

• 真 AI／Threads 網路壓測
• 新 usage meter

Acceptance

• race detector 綠，資料筆數／counter／usage records 對帳。

cd apps/backend && go test ./internal/module/radar/... ./internal/module/usage/... -race -count=1