thread-master/docs/product/brand-product-radar/tasks/T745-fit-stale-concurrency-tests.md

T745 — fit stale concurrency tests

Status: done
Milestone: M4 · Phase C
Kind: test · Est. change: ~190 lines

Goal

鎖定 stale 保存、產品更新快照、純同名排除與並行 merge 的端到端 domain 行為。

Depends on

• T742、T743、T744

Inputs

• ../spec.md 驗收 #2–#8、#12
• 代表性 CandidatePost 與 Product fixtures

Outputs

路徑	動作	說明
apps/backend/internal/module/radar/usecase/product_fit_integration_test.go	add	scorer→merge→primary cases
apps/backend/internal/module/radar/repository/product_match_race_test.go	add	concurrent same/different product merge

Behavior

• 20 天貼文 rejected/stale 但 match reasons 完整保存。
• Product 更新不重寫同 Opportunity 舊 match。
• race 結果無 duplicate，人工 primary 保留。

Out of scope

• HTTP 與前端
• 真平台抓取

Acceptance

• 具名覆蓋 stale／snapshot／same-product／override／並行 merge；普通測試通過。

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

Implementation result (2026-08-10): added stale-candidate evidence retention, immutable product snapshot, and concurrent same/different-product merge tests; the memory repository keeps one match per product and preserves human primary overrides. The requested race command was attempted, but this environment has CGO enabled without a gcc compiler, so the race binary cannot be built here.