feat(returnmatch): publish return matching and after-sales access (#338 #341)

server/app/admin/router/init_router.go

@@ -14,6 +14,7 @@ import (
 	goautopurchase "go-admin/app/goauto/purchase"
 	goautopurchaserule "go-admin/app/goauto/purchaserule"
 	goautoreplacement "go-admin/app/goauto/replacement"
+	goautoreturnmatch "go-admin/app/goauto/returnmatch"
 	goautorule "go-admin/app/goauto/rule"
 	goautoshopeeproduct "go-admin/app/goauto/shopeeproduct"
 	goautosybimport "go-admin/app/goauto/sybimport"
@@ -71,4 +72,5 @@ func InitRouter() {
 	goautosybshop.InitRouter(r, authMiddleware)
 	goautosybproductfilter.InitRouter(r, authMiddleware)
 	goautoyeeke.InitRouter(r, authMiddleware)
+	goautoreturnmatch.InitRouter(r, authMiddleware)
 }

server/app/goauto/access/modules.go

@@ -173,6 +173,8 @@ func moduleKeyForAPI(path string) string {
 		return ModuleYeekeSyncRuns
 	case strings.HasPrefix(path, "/api/admin/v1/yeeke-returns"):
 		return ModuleYeekeReturns
+	case strings.HasPrefix(path, "/api/admin/v1/return-matches"):
+		return ModuleSYBProducts
 	default:
 		return ""
 	}

server/app/goauto/access/purchaser.go

@@ -135,6 +135,15 @@ var AdminAPIs = []APIPermission{
 	{"查看 yeeke 同步详情", "/api/admin/v1/yeeke-returns/sync-runs/:runId", "GET", true},
 	{"手动触发 yeeke 同步", "/api/admin/v1/yeeke-returns/sync", "POST", true},
 
+	{"查看退货匹配", "/api/admin/v1/return-matches", "GET", true},
+	{"查看退货匹配批次", "/api/admin/v1/return-matches/batches", "GET", true},
+	{"查看退货匹配批次详情", "/api/admin/v1/return-matches/batches/:batchId", "GET", true},
+	{"查看退货匹配详情", "/api/admin/v1/return-matches/:id", "GET", true},
+	{"批量匹配退货", "/api/admin/v1/return-matches/batch-match", "POST", true},
+	{"确认退货匹配", "/api/admin/v1/return-matches/:id/confirm", "POST", true},
+	{"取消退货匹配", "/api/admin/v1/return-matches/:id/cancel", "POST", true},
+	{"备注退货匹配", "/api/admin/v1/return-matches/:id/remark", "POST", true},
+
 	{"查看 AI 匹配状态", "/api/admin/v1/ai-matching-settings", "GET", true},
 	{"保存 AI 匹配设置", "/api/admin/v1/ai-matching-settings", "PUT", false},
 	{"测试 AI 服务连接", "/api/admin/v1/ai-matching-settings/test", "POST", false},

server/app/goauto/migrations/migrate.go

@@ -79,6 +79,9 @@ func MigratedModels() []any {
 		&models.PDDProductReplacement{},
 		&models.PDDProductReplacementItem{},
 		&models.PDDProductReplacementWorkerLease{},
+		&models.ReturnMatch{},
+		&models.ReturnMatchLog{},
+		&models.ReturnMatchBatch{},
 	}
 }
 

server/app/goauto/models/return_match.go

@@ -0,0 +1,71 @@
+package models
+
+import "time"
+
+// #338: ReturnMatch links one syb_product row to one yeeke_return_item row so
+// the return can be reused instead of buying the item again on PDD. A match
+// is "active" (still blocking purchase creation and occupying the return)
+// while Status is matched or confirmed; cancelling clears both Active*
+// columns so the unique index frees up both sides for a future rematch
+// (issue #338, business rule: 取消匹配后再次点击「匹配退货」若配回同一对，允许).
+//
+// ActiveSYBProductID/ActiveYeekeReturnItemID follow the same nullable-unique-
+// column pattern already used by YeekeSyncRun.ActiveSlot in this codebase:
+// MySQL unique indexes allow any number of NULL rows, so only the currently
+// active match for a given side occupies the slot, and a concurrent second
+// insert for the same side fails the unique constraint instead of double-
+// booking it.
+const (
+	ReturnMatchStatusMatched   = "matched"
+	ReturnMatchStatusConfirmed = "confirmed"
+	ReturnMatchStatusCancelled = "cancelled"
+)
+
+type ReturnMatch struct {
+	ID uint64 `json:"id" gorm:"primaryKey;autoIncrement"`
+
+	SYBProductID      uint64 `json:"sybProductId" gorm:"not null;index"`
+	YeekeReturnItemID uint64 `json:"yeekeReturnItemId" gorm:"not null;index"`
+
+	// ActiveSYBProductID/ActiveYeekeReturnItemID mirror the ID columns above
+	// while Status is matched/confirmed, and are cleared to NULL on cancel.
+	ActiveSYBProductID      *uint64 `json:"-" gorm:"uniqueIndex:ux_return_match_active_syb"`
+	ActiveYeekeReturnItemID *uint64 `json:"-" gorm:"uniqueIndex:ux_return_match_active_return"`
+
+	Status string `json:"status" gorm:"size:16;not null;index;check:ck_return_match_status,status IN ('matched','confirmed','cancelled')"`
+
+	// Snapshots of the normalized spec text on both sides at match time, kept
+	// for audit and for the compare screen even if the source rows change
+	// later.
+	SYBSpecText   string `json:"sybSpecText" gorm:"size:255;not null;default:''"`
+	YeekeSpecText string `json:"yeekeSpecText" gorm:"size:255;not null;default:''"`
+	NormalizedKey string `json:"normalizedKey" gorm:"size:255;not null;default:'';index"`
+
+	// PreviousProcessStage records what the SYB product's computed process
+	// stage was immediately before this match, so cancel can report/restore
+	// context; the actual restore is a pure recomputation (no stage is
+	// stored on syb_product), this is for audit/display only.
+	PreviousProcessStage string `json:"previousProcessStage" gorm:"size:32;not null;default:''"`
+
+	DestroyDeadlineSnapshot *time.Time `json:"destroyDeadlineSnapshot,omitempty"`
+
+	Remark string `json:"remark" gorm:"size:500;not null;default:''"`
+
+	MatchedBy   string     `json:"matchedBy" gorm:"size:64;not null;default:''"`
+	MatchedAt   time.Time  `json:"matchedAt"`
+	ConfirmedBy string     `json:"confirmedBy,omitempty" gorm:"size:64;not null;default:''"`
+	ConfirmedAt *time.Time `json:"confirmedAt,omitempty"`
+	CancelledBy string     `json:"cancelledBy,omitempty" gorm:"size:64;not null;default:''"`
+	CancelledAt *time.Time `json:"cancelledAt,omitempty"`
+
+	CreatedAt time.Time `json:"createdAt"`
+	UpdatedAt time.Time `json:"updatedAt"`
+}
+
+func (ReturnMatch) TableName() string { return "return_match" }
+
+// IsActive reports whether the match currently blocks purchase creation and
+// occupies its return item.
+func (m ReturnMatch) IsActive() bool {
+	return m.Status == ReturnMatchStatusMatched || m.Status == ReturnMatchStatusConfirmed
+}

server/app/goauto/models/return_match_batch.go

@@ -0,0 +1,25 @@
+package models
+
+import "time"
+
+// ReturnMatchBatch records one click of 「匹配退货」 (#338): who submitted it,
+// which SYB products were submitted and the per-product outcome, so a later
+// question like "why did only N of my selection match" can be answered from
+// data instead of reconstructing the page selection. ItemsJSON holds the
+// []BatchMatchItem result array (sybProductId/matched/reasonCode/reason/
+// matchId) in submission order.
+type ReturnMatchBatch struct {
+	ID             uint64 `json:"id" gorm:"primaryKey;autoIncrement"`
+	Operator       string `json:"operator" gorm:"size:64;not null;default:'';index"`
+	SubmittedCount int    `json:"submittedCount" gorm:"not null;default:0"`
+	MatchedCount   int    `json:"matchedCount" gorm:"not null;default:0"`
+	SkippedCount   int    `json:"skippedCount" gorm:"not null;default:0"`
+	ItemsJSON      string `json:"-" gorm:"type:longtext;not null"`
+	// Error is non-empty when the batch aborted part-way; ItemsJSON then
+	// holds only the rows processed before the failure.
+	Error string `json:"error" gorm:"size:500;not null;default:''"`
+
+	CreatedAt time.Time `json:"createdAt" gorm:"index"`
+}
+
+func (ReturnMatchBatch) TableName() string { return "return_match_batch" }

server/app/goauto/models/return_match_log.go

@@ -0,0 +1,28 @@
+package models
+
+import "time"
+
+// ReturnMatchLog is #338's dedicated operation log for the return-matching
+// feature. The framework's generic sys_opera_log records raw HTTP
+// request/response per call and is not queryable per match id nor does it
+// carry a stable action/operator/detail shape, so this table is written
+// explicitly, in the same transaction as the action it records (match /
+// confirm / cancel / remark).
+const (
+	ReturnMatchLogActionMatched   = "matched"
+	ReturnMatchLogActionConfirmed = "confirmed"
+	ReturnMatchLogActionCancelled = "cancelled"
+	ReturnMatchLogActionRemark    = "remark"
+)
+
+type ReturnMatchLog struct {
+	ID       uint64 `json:"id" gorm:"primaryKey;autoIncrement"`
+	MatchID  uint64 `json:"matchId" gorm:"not null;index"`
+	Action   string `json:"action" gorm:"size:16;not null;index;check:ck_return_match_log_action,action IN ('matched','confirmed','cancelled','remark')"`
+	Operator string `json:"operator" gorm:"size:64;not null;default:''"`
+	Detail   string `json:"detail" gorm:"size:1000;not null;default:''"`
+
+	CreatedAt time.Time `json:"createdAt"`
+}
+
+func (ReturnMatchLog) TableName() string { return "return_match_log" }

server/app/goauto/models/yeeke.go

@@ -38,9 +38,14 @@ type YeekeReturnPackage struct {
 	UpdateTime         *time.Time
 	DestroyDeadLine    *time.Time
 	LastSyncedAt       time.Time `gorm:"not null;index"`
-	SyncStatus         string    `gorm:"size:32;not null;default:'ok'"`
-	CreatedAt          time.Time
-	UpdatedAt          time.Time
+	// SyncStatus is "ok" while the package still appears in a COMPLETE yeeke
+	// sync; #338 sets it to "missing" (with MissingSince stamped) once a
+	// completed sync no longer sees it, so return matching stops using it.
+	// It is never deleted or marked "已销毁" — only flagged unavailable.
+	SyncStatus   string `gorm:"size:32;not null;default:'ok';index"`
+	MissingSince *time.Time
+	CreatedAt    time.Time
+	UpdatedAt    time.Time
 }
 
 func (YeekeReturnPackage) TableName() string { return "yeeke_return_package" }
@@ -56,32 +61,40 @@ type YeekeReturnItem struct {
 	Image         string    `gorm:"type:text;not null"`
 	Quantity      int64     `gorm:"not null;default:0"`
 	LastSyncedAt  time.Time `gorm:"not null;index"`
-	SyncStatus    string    `gorm:"size:32;not null;default:'ok'"`
-	CreatedAt     time.Time
-	UpdatedAt     time.Time
+	// SyncStatus/MissingSince mirror YeekeReturnPackage's fields (#338): once
+	// a COMPLETE yeeke sync no longer sees this item it is flagged "missing"
+	// so returnmatch.availableReturnPool stops offering it, without ever
+	// deleting the row.
+	SyncStatus   string `gorm:"size:32;not null;default:'ok';index"`
+	MissingSince *time.Time
+	CreatedAt    time.Time
+	UpdatedAt    time.Time
 }
 
 func (YeekeReturnItem) TableName() string { return "yeeke_return_item" }
 
 type YeekeSyncRun struct {
-	ID             uint64    `gorm:"primaryKey;autoIncrement"`
-	Status         string    `gorm:"size:32;not null;index"`
-	Trigger        string    `gorm:"size:32;not null;index"`
-	TotalPages     int       `gorm:"not null;default:0"`
-	ReadCount      int       `gorm:"not null;default:0"`
-	CreatedCount   int       `gorm:"not null;default:0"`
-	UpdatedCount   int       `gorm:"not null;default:0"`
-	SkippedCount   int       `gorm:"not null;default:0"`
-	FailedCount    int       `gorm:"not null;default:0"`
-	ErrorMessage   string    `gorm:"size:1000;not null;default:''"`
-	StartedAt      time.Time `gorm:"not null"`
-	FinishedAt     *time.Time
-	LastSuccessAt  *time.Time
-	ActiveSlot     *uint8 `gorm:"uniqueIndex:ux_yeeke_sync_run_active_slot"`
-	LeaseOwner     string `gorm:"size:128;not null;default:''"`
-	LeaseExpiresAt *time.Time
-	CreatedAt      time.Time
-	UpdatedAt      time.Time
+	ID           uint64 `gorm:"primaryKey;autoIncrement"`
+	Status       string `gorm:"size:32;not null;index"`
+	Trigger      string `gorm:"size:32;not null;index"`
+	TotalPages   int    `gorm:"not null;default:0"`
+	ReadCount    int    `gorm:"not null;default:0"`
+	CreatedCount int    `gorm:"not null;default:0"`
+	UpdatedCount int    `gorm:"not null;default:0"`
+	SkippedCount int    `gorm:"not null;default:0"`
+	FailedCount  int    `gorm:"not null;default:0"`
+	// #338: items flipped to "missing" / back to "ok" by this run.
+	MissingMarkedCount int       `gorm:"not null;default:0"`
+	RecoveredCount     int       `gorm:"not null;default:0"`
+	ErrorMessage       string    `gorm:"size:1000;not null;default:''"`
+	StartedAt          time.Time `gorm:"not null"`
+	FinishedAt         *time.Time
+	LastSuccessAt      *time.Time
+	ActiveSlot         *uint8 `gorm:"uniqueIndex:ux_yeeke_sync_run_active_slot"`
+	LeaseOwner         string `gorm:"size:128;not null;default:''"`
+	LeaseExpiresAt     *time.Time
+	CreatedAt          time.Time
+	UpdatedAt          time.Time
 }
 
 func (YeekeSyncRun) TableName() string { return "yeeke_sync_run" }

server/app/goauto/purchase/batch.go

@@ -142,6 +142,11 @@ type batchPreviewDataset struct {
 	// 见 #289 与 sybimport.RawSpecHalves。
 	collapsedColorByShopee map[uint64]map[string]bool
 	collapsedSizeByShopee  map[uint64]map[string]bool
+	// activeReturnMatchBySYB is #338's return-match stage input: a non-zero
+	// entry means the SYB product currently has an active (matched or
+	// confirmed) return_match row, which forces the 退货待确认/已用退货
+	// stages regardless of what the rest of the pipeline would compute.
+	activeReturnMatchBySYB map[uint64]models.ReturnMatch
 }
 
 // loadBatchPreviewDataset keeps the read-only preview on bounded bulk queries.
@@ -159,6 +164,7 @@ func (s *Service) loadBatchPreviewDataset(ctx context.Context, ids []uint64) (ba
 		skuCombinationsByPDD:   make(map[uint64][]pddSKUCombination),
 		collapsedColorByShopee: make(map[uint64]map[string]bool),
 		collapsedSizeByShopee:  make(map[uint64]map[string]bool),
+		activeReturnMatchBySYB: make(map[uint64]models.ReturnMatch),
 	}
 	var sybProducts []models.SYBProduct
 	if err := s.DB.WithContext(ctx).Where("id IN ?", ids).Find(&sybProducts).Error; err != nil {
@@ -248,6 +254,18 @@ func (s *Service) loadBatchPreviewDataset(ctx context.Context, ids []uint64) (ba
 			dataset.latestTaskBySYB[*task.SYBProductID] = task
 		}
 	}
+	// #338: load active return matches for these SYB products. This query
+	// only ever ADDS a stage override on top of the pre-#338 computation; an
+	// empty result set (the common case for products never matched) leaves
+	// every other branch of processStageFromDataset byte-for-byte unchanged
+	// (issue #338 acceptance item 11 regression).
+	var activeMatches []models.ReturnMatch
+	if err := s.DB.WithContext(ctx).Where("syb_product_id IN ? AND active_syb_product_id IS NOT NULL", ids).Find(&activeMatches).Error; err != nil {
+		return dataset, err
+	}
+	for _, m := range activeMatches {
+		dataset.activeReturnMatchBySYB[m.SYBProductID] = m
+	}
 	return dataset, nil
 }
 

server/app/goauto/purchase/batch_test.go

@@ -311,10 +311,11 @@ func TestBatchPreviewBulkLoadsAndNeverCallsAIMatcher(t *testing.T) {
 		t.Fatalf("read-only preview called AI matcher %d times", matcher.calls)
 	}
 	// #289 新增一次有界批量查询（按蕃皮商品拉全部明细用于塔缩检测），
-	// 因此从 7 变为 8。这条断言守的是“不得出现 N+1”，不是具体数字；
-	// 只有新增的查询确实有界时才允许上调。
-	if queries != 8 {
-		t.Fatalf("batch preview used %d queries, want 8 bounded queries including collection eligibility, current purchase rule and collapsed spec keys", queries)
+	// 因此从 7 变为 8；#338 再新增一次有界批量查询（按 SYB 商品ID拉活跃
+	// 退货匹配），因此从 8 变为 9。这条断言守的是“不得出现 N+1”，不是具体
+	// 数字；只有新增的查询确实有界时才允许上调。
+	if queries != 9 {
+		t.Fatalf("batch preview used %d queries, want 9 bounded queries including collection eligibility, current purchase rule, collapsed spec keys and #338 active return matches", queries)
 	}
 	if len(response.Items) != 2 || !response.Items[0].Eligible || !response.Items[1].Eligible || response.EligibleCount != 2 {
 		t.Fatalf("unresolved rows remain eligible for live probing but are not purchase-ready: %+v", response)

server/app/goauto/purchase/process_stage.go

@@ -21,7 +21,13 @@ const (
 	ProcessStageTaskCreated       = "task_created"
 	ProcessStagePurchaseSucceeded = "purchase_succeeded"
 	ProcessStageOrderReview       = "order_review"
-	processActionOpenPDDLink      = "open_pdd_link"
+	// ProcessStageReturnPending/ProcessStageReturnUsed are the two new stages
+	// added by issue #338: a SYB product with an active return_match blocks
+	// purchase creation regardless of what stage it would otherwise compute
+	// to (see rejectIfActiveReturnMatch and processStageFromDataset below).
+	ProcessStageReturnPending = "return_pending"
+	ProcessStageReturnUsed    = "return_used"
+	processActionOpenPDDLink  = "open_pdd_link"
 )
 
 var processStageLabels = map[string]string{
@@ -35,6 +41,8 @@ var processStageLabels = map[string]string{
 	ProcessStageTaskCreated:       "已创建任务",
 	ProcessStagePurchaseSucceeded: "采购成功",
 	ProcessStageOrderReview:       "待人工核对",
+	ProcessStageReturnPending:     "退货待确认",
+	ProcessStageReturnUsed:        "已用退货",
 }
 
 type ProcessStageResult struct {
@@ -132,6 +140,17 @@ func processStageFromDataset(id uint64, dataset batchPreviewDataset, preview Bat
 		}
 	}
 
+	// #338: an active return match overrides the normal computation below —
+	// it only ever fires for a SYB product that has one, so with zero
+	// matches (the pre-#338 default) this branch is a no-op and every stage
+	// below is unchanged (acceptance item 11 regression).
+	if match, ok := dataset.activeReturnMatchBySYB[id]; ok {
+		if match.Status == models.ReturnMatchStatusConfirmed {
+			return stage(ProcessStageReturnUsed, "已用退货冲抵，无需采购", "open_return_match")
+		}
+		return stage(ProcessStageReturnPending, "已匹配退货待人工确认，暂不能创建采购任务", "open_return_match")
+	}
+
 	syb, ok := dataset.sybByID[id]
 	if !ok {
 		return stage(ProcessStageManualAction, "SYB 商品不存在或已删除", "refresh")

server/app/goauto/purchase/return_match_block.go

@@ -0,0 +1,30 @@
+package purchase
+
+import (
+	"go-admin/app/goauto/models"
+
+	"gorm.io/gorm"
+)
+
+// rejectIfActiveReturnMatch implements issue #338's purchase-creation block:
+// a SYB product with an active (matched or confirmed) return_match row must
+// not get a NEW purchase task created for it (single or batch — BatchCreate
+// calls s.Create per row, so this single check point covers both paths and
+// batch creation simply skips the row via the normal createErr handling,
+// issue #338 acceptance item 5). Resuming/reparsing an existing task is a
+// different code path and is not affected.
+//
+// On any query error this returns the error (never nil) so a DB failure can
+// never silently allow a purchase for an already-matched product (issue
+// #338 acceptance item 11).
+func rejectIfActiveReturnMatch(tx *gorm.DB, sybProductID uint64) error {
+	var match models.ReturnMatch
+	err := tx.Where("active_syb_product_id = ?", sybProductID).First(&match).Error
+	if err == nil {
+		return fail(CodeReturnMatched, "该商品已匹配退货，需先在退货匹配中取消才能创建采购任务")
+	}
+	if err == gorm.ErrRecordNotFound {
+		return nil
+	}
+	return internal(err)
+}

server/app/goauto/purchase/return_match_block_test.go

@@ -0,0 +1,145 @@
+package purchase
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"go-admin/app/goauto/models"
+
+	"github.com/google/uuid"
+)
+
+// #338 acceptance item 5/6/11: a SYB product with an active return match
+// must be rejected for NEW single-task creation, batch creation must skip
+// only that row (not fail the whole batch), and with zero matches (the
+// default) behavior must be byte-for-byte unchanged.
+
+func TestCreate_RejectsWhenActiveReturnMatch(t *testing.T) {
+	db := testDB(t)
+	s := testService(db)
+	f := seed(t, db, liveCaps(), true)
+
+	match := models.ReturnMatch{
+		SYBProductID: f.syb.ID, YeekeReturnItemID: 1,
+		ActiveSYBProductID: &f.syb.ID, Status: models.ReturnMatchStatusMatched,
+		MatchedAt: time.Now(),
+	}
+	if err := db.Create(&match).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	_, err := createLive(t, s, f)
+	if err == nil {
+		t.Fatalf("expected rejection, got success")
+	}
+	if se, ok := asServiceError(err); !ok || se.Code != CodeReturnMatched {
+		t.Fatalf("expected CodeReturnMatched, got %v", err)
+	}
+}
+
+func TestCreate_ConfirmedReturnMatchAlsoRejects(t *testing.T) {
+	db := testDB(t)
+	s := testService(db)
+	f := seed(t, db, liveCaps(), true)
+
+	match := models.ReturnMatch{
+		SYBProductID: f.syb.ID, YeekeReturnItemID: 1,
+		ActiveSYBProductID: &f.syb.ID, Status: models.ReturnMatchStatusConfirmed,
+		MatchedAt: time.Now(),
+	}
+	if err := db.Create(&match).Error; err != nil {
+		t.Fatal(err)
+	}
+	_, err := createLive(t, s, f)
+	if err == nil {
+		t.Fatalf("expected rejection for confirmed match too")
+	}
+	if se, ok := asServiceError(err); !ok || se.Code != CodeReturnMatched {
+		t.Fatalf("expected CodeReturnMatched, got %v", err)
+	}
+}
+
+func TestCreate_CancelledReturnMatchDoesNotBlock(t *testing.T) {
+	db := testDB(t)
+	s := testService(db)
+	f := seed(t, db, liveCaps(), true)
+
+	match := models.ReturnMatch{
+		SYBProductID: f.syb.ID, YeekeReturnItemID: 1,
+		ActiveSYBProductID: nil, Status: models.ReturnMatchStatusCancelled,
+		MatchedAt: time.Now(),
+	}
+	if err := db.Create(&match).Error; err != nil {
+		t.Fatal(err)
+	}
+	if _, err := createLive(t, s, f); err != nil {
+		t.Fatalf("cancelled match must not block creation: %v", err)
+	}
+}
+
+// TestBatchCreate_SkipsOnlyBlockedRowNotWholeBatch is the acceptance-item-5
+// "batch creation must skip just those rows" regression: one blocked SYB
+// product and one clean one in the same batch call.
+func TestBatchCreate_SkipsOnlyBlockedRowNotWholeBatch(t *testing.T) {
+	db := testDB(t)
+	s := testService(db)
+	f1 := seed(t, db, liveCaps(), true)
+	setCollectedPDDPrice(t, db, f1.pdd.ID)
+
+	// second, independent eligible SYB product sharing the same shopee/pdd
+	// chain shape but its own row.
+	syb2 := models.SYBProduct{OrderCode: "SYB-2", DetailID: 2, StockID: 3, ShopeeItemID: f1.shopee.ShopeeItemID, ShopeeProductID: &f1.shopee.ID, ProductTitle: f1.shopee.Title, TargetColor: "黑色", TargetSize: "XL", Quantity: 1, UnitPriceCent: 2000, ImageURL: "", ParseStatus: models.SYBParseStatusSuccess, RawJSON: `{}`}
+	if err := db.Create(&syb2).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	match := models.ReturnMatch{
+		SYBProductID: f1.syb.ID, YeekeReturnItemID: 1,
+		ActiveSYBProductID: &f1.syb.ID, Status: models.ReturnMatchStatusMatched,
+		MatchedAt: time.Now(),
+	}
+	if err := db.Create(&match).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := s.BatchCreate(context.Background(), BatchCreateRequest{
+		RequestID: uuid.NewString(), SYBProductIDs: []uint64{f1.syb.ID, syb2.ID}, DeviceID: &f1.device.ID,
+	})
+	if err != nil {
+		t.Fatalf("batch call itself must not fail: %v", err)
+	}
+	if resp.CreatedCount != 1 || resp.FailedCount != 1 {
+		t.Fatalf("expected 1 created + 1 failed, got created=%d failed=%d items=%+v", resp.CreatedCount, resp.FailedCount, resp.Items)
+	}
+	for _, item := range resp.Items {
+		if item.SYBProductID == f1.syb.ID {
+			if item.Created {
+				t.Fatalf("matched row must not be created: %+v", item)
+			}
+			if item.ReasonCode != CodeReturnMatched {
+				t.Fatalf("expected CodeReturnMatched reason, got %+v", item)
+			}
+		}
+		if item.SYBProductID == syb2.ID && !item.Created {
+			t.Fatalf("clean row must still be created: %+v", item)
+		}
+	}
+}
+
+// TestCreate_NoReturnMatchTableRowsUnaffected is the acceptance-item-11
+// regression: with zero return_match rows anywhere, creation behaves exactly
+// as it did before #338.
+func TestCreate_NoReturnMatchTableRowsUnaffected(t *testing.T) {
+	db := testDB(t)
+	s := testService(db)
+	f := seed(t, db, liveCaps(), true)
+	if _, err := createLive(t, s, f); err != nil {
+		t.Fatalf("zero-match baseline must succeed unchanged: %v", err)
+	}
+}
+
+func asServiceError(err error) (*ServiceError, bool) {
+	se, ok := err.(*ServiceError)
+	return se, ok
+}

server/app/goauto/purchase/service.go

@@ -178,6 +178,9 @@ func (s *Service) create(ctx context.Context, req CreateRequest) (models.Purchas
 			if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).First(&syb, *req.SYBProductID).Error; err != nil {
 				return notFound(err, "顺云宝商品不存在")
 			}
+			if err := rejectIfActiveReturnMatch(tx, syb.ID); err != nil {
+				return err
+			}
 			if syb.ShopeeProductID == nil {
 				return fail(CodeInvalidRequest, "该商品尚未关联蝦皮商品")
 			}

server/app/goauto/purchase/types.go

@@ -36,7 +36,12 @@ const (
 	CodeOrderTimeMissing    = "PURCHASE_ORDER_TIME_MISSING"
 	CodeOrderTimeInvalid    = "PURCHASE_ORDER_TIME_INVALID"
 	CodeOrderUnpaidMissing  = "PURCHASE_ORDER_UNPAID_EVIDENCE_MISSING"
-	CodeInternal            = "INTERNAL_ERROR"
+	// CodeReturnMatched is returned when a SYB product has an active (matched
+	// or confirmed) return match: issue #338 blocks creating NEW purchase
+	// tasks for such a product until the match is cancelled. Resuming or
+	// reparsing an existing task is not affected.
+	CodeReturnMatched = "PURCHASE_RETURN_MATCHED"
+	CodeInternal      = "INTERNAL_ERROR"
 )
 
 type ServiceError struct {

server/app/goauto/returnmatch/batch_record_test.go

@@ -0,0 +1,80 @@
+package returnmatch
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"go-admin/app/goauto/models"
+)
+
+// #338: every 「匹配退货」 click is recorded with the submitted SYB products in
+// order and each one's outcome, so "why did only some of my selection match"
+// can be answered from data.
+func TestBatchMatch_RecordsSubmittedProductsAndOutcomes(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	hit := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 2, 0, 0, 0, 0, time.UTC))
+	miss := seedSYB(t, db, "SYB-2", 2, "黑色", "XL", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L", &deadline)
+	missingID := uint64(999999)
+
+	submitted := []uint64{miss.ID, hit.ID, missingID}
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: submitted, Operator: "caigou1"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	batches, err := s.ListBatches(context.Background(), 10, true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(batches) != 1 {
+		t.Fatalf("want exactly one batch record, got %d", len(batches))
+	}
+	b := batches[0]
+	if b.Operator != "caigou1" || b.SubmittedCount != 3 || b.MatchedCount != 1 || b.SkippedCount != 2 || b.Error != "" {
+		t.Fatalf("unexpected batch header: %+v", b.ReturnMatchBatch)
+	}
+	if len(b.Items) != len(submitted) {
+		t.Fatalf("want %d items, got %+v", len(submitted), b.Items)
+	}
+	for i, id := range submitted {
+		if b.Items[i].SYBProductID != id {
+			t.Fatalf("item %d: want submitted order id %d, got %d", i, id, b.Items[i].SYBProductID)
+		}
+	}
+	if b.Items[0].ReasonCode != ReasonNoCandidate || !b.Items[1].Matched || b.Items[1].MatchID != resp.Items[1].MatchID || b.Items[2].ReasonCode != ReasonStageIneligible {
+		t.Fatalf("unexpected recorded outcomes: %+v", b.Items)
+	}
+
+	got, err := s.GetBatch(context.Background(), b.ID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(got.Items) != 3 {
+		t.Fatalf("GetBatch items: %+v", got.Items)
+	}
+
+	// The list without items stays small.
+	light, err := s.ListBatches(context.Background(), 10, false)
+	if err != nil || len(light) != 1 || light[0].Items != nil {
+		t.Fatalf("list without items: %+v err=%v", light, err)
+	}
+}
+
+// An empty submission is rejected before matching and leaves no record.
+func TestBatchMatch_EmptySubmissionNotRecorded(t *testing.T) {
+	db := testDB(t)
+	if _, err := NewService(db).BatchMatch(context.Background(), BatchMatchRequest{Operator: "x"}); err != nil {
+		t.Fatal(err)
+	}
+	var n int64
+	db.Model(&models.ReturnMatchBatch{}).Count(&n)
+	if n != 0 {
+		t.Fatalf("empty submission recorded %d batches", n)
+	}
+}

server/app/goauto/returnmatch/candidate.go

@@ -0,0 +1,112 @@
+package returnmatch
+
+import (
+	"sort"
+	"time"
+)
+
+// SYBCandidate is the pure, DB-free view of one selected SYB order product
+// eligible to participate in this batch's matching (stage filter and "no
+// active match" filter are applied by the caller before building this list;
+// see issue #338 rule 1).
+type SYBCandidate struct {
+	SYBProductID uint64
+	ShopeeItemID string
+	TargetColor  string
+	TargetSize   string
+	CreatedAt    time.Time
+}
+
+// ReturnCandidate is the pure, DB-free view of one available yeeke return
+// item (no active match, non-nil destroy deadline; the "deadline later than
+// now" filter is applied by the caller — see BuildReturnPool below, or by
+// the caller directly when it already filters in SQL).
+type ReturnCandidate struct {
+	ReturnItemID    uint64
+	ItemID          string
+	VariationName   string
+	DestroyDeadline time.Time
+}
+
+// SkipReason enumerates why a selected SYB candidate was not matched in this
+// batch, for the batch-result dialog's per-row reasons (issue #338 prototype
+// screen 2).
+type SkipReason string
+
+const (
+	SkipReasonNoCandidate SkipReason = "no_candidate"
+)
+
+// MatchOutcome is one row of the pure matching result: either matched to a
+// return item, or skipped with a reason.
+type MatchOutcome struct {
+	SYBProductID    uint64
+	Matched         bool
+	ReturnItemID    uint64
+	SkipReason      SkipReason
+	NormalizedKey   string
+	DestroyDeadline time.Time
+}
+
+// SelectMatches implements issue #338 rules 2-6 purely in memory:
+//   - products are processed in the order given by the caller, which MUST be
+//     SYB created_at DESC (rule 4); this function does not itself sort by
+//     CreatedAt so a caller can supply a stable pre-sorted/tie-broken order.
+//   - a return is eligible only while its deadline is strictly after `now`
+//     (rule 2), matched on shopeeItemId + normalized spec text (rule 3);
+//   - once a return is used within this run it cannot be reused by a later
+//     product in the same run, on top of whatever was already occupied
+//     before the run started (rule 4, "已被占用的退货商品不再参与本轮后续
+//     及以后的匹配");
+//   - when several candidates match the same product, the one with the
+//     earliest destroy deadline is chosen (rule 5); quantity is ignored
+//     entirely (rule 6).
+func SelectMatches(products []SYBCandidate, returns []ReturnCandidate, now time.Time) []MatchOutcome {
+	// Group available (deadline > now) returns by matchKey = itemId + "|" +
+	// normalized spec text, sorted by deadline ascending so the first unused
+	// entry in each bucket is always the earliest deadline.
+	buckets := make(map[string][]ReturnCandidate)
+	for _, r := range returns {
+		if !r.DestroyDeadline.After(now) {
+			continue
+		}
+		key := matchKey(r.ItemID, trimCommas(Normalize(r.VariationName)))
+		buckets[key] = append(buckets[key], r)
+	}
+	for key := range buckets {
+		bucket := buckets[key]
+		sort.Slice(bucket, func(i, j int) bool {
+			return bucket[i].DestroyDeadline.Before(bucket[j].DestroyDeadline)
+		})
+		buckets[key] = bucket
+	}
+
+	used := make(map[uint64]bool)
+	outcomes := make([]MatchOutcome, 0, len(products))
+	for _, p := range products {
+		key := matchKey(p.ShopeeItemID, trimCommas(Normalize(SYBSpecText(p.TargetColor, p.TargetSize))))
+		var picked *ReturnCandidate
+		for i := range buckets[key] {
+			cand := buckets[key][i]
+			if used[cand.ReturnItemID] {
+				continue
+			}
+			picked = &buckets[key][i]
+			break
+		}
+		if picked == nil {
+			outcomes = append(outcomes, MatchOutcome{SYBProductID: p.SYBProductID, Matched: false, SkipReason: SkipReasonNoCandidate, NormalizedKey: key})
+			continue
+		}
+		used[picked.ReturnItemID] = true
+		outcomes = append(outcomes, MatchOutcome{
+			SYBProductID: p.SYBProductID, Matched: true, ReturnItemID: picked.ReturnItemID,
+			NormalizedKey: key, DestroyDeadline: picked.DestroyDeadline,
+		})
+	}
+	return outcomes
+}
+
+func matchKey(itemID, normalizedSpec string) string {
+	return itemID + "|" + normalizedSpec
+}

server/app/goauto/returnmatch/candidate_test.go

@@ -0,0 +1,149 @@
+package returnmatch
+
+import (
+	"testing"
+	"time"
+)
+
+func t1(offsetDays int) time.Time {
+	base := time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC)
+	return base.AddDate(0, 0, offsetDays)
+}
+
+func TestSelectMatches_BasicMatch(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{
+		{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "2XL", CreatedAt: t1(-1)},
+	}
+	returns := []ReturnCandidate{
+		{ReturnItemID: 900, ItemID: "100", VariationName: "白色,2XL【建議65-75公斤】", DestroyDeadline: t1(10)},
+	}
+	out := SelectMatches(products, returns, now)
+	if len(out) != 1 || !out[0].Matched || out[0].ReturnItemID != 900 {
+		t.Fatalf("unexpected outcome: %+v", out)
+	}
+}
+
+// TestSelectMatches_MultiColourSameOrderCrossPairing reproduces issue #338's
+// documented real-world case: the same order buys 2+ colour variants of the
+// same Shopee item, and each SYB row must pair with the return item of its
+// OWN colour, never grab whichever candidate is available first.
+func TestSelectMatches_MultiColourSameOrderCrossPairing(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{
+		{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "2XL", CreatedAt: t1(-1)},
+		{SYBProductID: 2, ShopeeItemID: "100", TargetColor: "紫色", TargetSize: "M", CreatedAt: t1(-2)},
+	}
+	returns := []ReturnCandidate{
+		{ReturnItemID: 901, ItemID: "100", VariationName: "紫色,M【建議43-53公斤】", DestroyDeadline: t1(5)},
+		{ReturnItemID: 900, ItemID: "100", VariationName: "白色,2XL【建議65-75公斤】", DestroyDeadline: t1(10)},
+	}
+	out := SelectMatches(products, returns, now)
+	got := map[uint64]uint64{}
+	for _, o := range out {
+		if !o.Matched {
+			t.Fatalf("expected all matched, got skip: %+v", o)
+		}
+		got[o.SYBProductID] = o.ReturnItemID
+	}
+	if got[1] != 900 {
+		t.Fatalf("white/2XL SYB product should match return 900 (white/2XL), got %d", got[1])
+	}
+	if got[2] != 901 {
+		t.Fatalf("purple/M SYB product should match return 901 (purple/M), got %d", got[2])
+	}
+}
+
+func TestSelectMatches_ExpiredDeadlineExcluded(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", CreatedAt: t1(-1)}}
+	returns := []ReturnCandidate{
+		{ReturnItemID: 900, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(0)},  // not after now -> excluded
+		{ReturnItemID: 901, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(-1)}, // already past -> excluded
+	}
+	out := SelectMatches(products, returns, now)
+	if out[0].Matched {
+		t.Fatalf("expected no match for expired-only candidates, got %+v", out[0])
+	}
+	if out[0].SkipReason != SkipReasonNoCandidate {
+		t.Fatalf("unexpected skip reason: %+v", out[0])
+	}
+}
+
+func TestSelectMatches_EarliestDeadlineFirst(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", CreatedAt: t1(-1)}}
+	returns := []ReturnCandidate{
+		{ReturnItemID: 900, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(30)},
+		{ReturnItemID: 901, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(3)}, // soonest to expire, must win
+		{ReturnItemID: 902, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(10)},
+	}
+	out := SelectMatches(products, returns, now)
+	if !out[0].Matched || out[0].ReturnItemID != 901 {
+		t.Fatalf("expected earliest-deadline candidate 901, got %+v", out[0])
+	}
+}
+
+func TestSelectMatches_OccupiedWithinRunNotReused(t *testing.T) {
+	now := t1(0)
+	// Two products with the identical spec, only one return item available:
+	// processed in the given (already created_at DESC) order, the second
+	// product must NOT be able to reuse the same return item.
+	products := []SYBCandidate{
+		{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", CreatedAt: t1(-1)}, // newer, processed first (DESC)
+		{SYBProductID: 2, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", CreatedAt: t1(-5)},
+	}
+	returns := []ReturnCandidate{
+		{ReturnItemID: 900, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(10)},
+	}
+	out := SelectMatches(products, returns, now)
+	if !out[0].Matched || out[0].ReturnItemID != 900 {
+		t.Fatalf("first (newer) product should win the only candidate: %+v", out[0])
+	}
+	if out[1].Matched {
+		t.Fatalf("second product must not reuse the already-occupied return: %+v", out[1])
+	}
+}
+
+func TestSelectMatches_QuantityIgnored(t *testing.T) {
+	// SYBCandidate/ReturnCandidate deliberately carry no quantity field at
+	// all: this test documents that omission is intentional (issue #338
+	// rule 6, quantity never participates in matching).
+	now := t1(0)
+	products := []SYBCandidate{{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", CreatedAt: t1(-1)}}
+	returns := []ReturnCandidate{{ReturnItemID: 900, ItemID: "100", VariationName: "白色,L", DestroyDeadline: t1(10)}}
+	out := SelectMatches(products, returns, now)
+	if !out[0].Matched {
+		t.Fatalf("expected match regardless of any quantity mismatch: %+v", out[0])
+	}
+}
+
+func TestSelectMatches_ColorOnlySYBSpecMatchesPlainYeekeText(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "黑色", TargetSize: "", CreatedAt: t1(-1)}}
+	returns := []ReturnCandidate{{ReturnItemID: 900, ItemID: "100", VariationName: "黑色", DestroyDeadline: t1(10)}}
+	out := SelectMatches(products, returns, now)
+	if !out[0].Matched || out[0].ReturnItemID != 900 {
+		t.Fatalf("color-only spec should still match: %+v", out[0])
+	}
+}
+
+func TestSelectMatches_SizeOnlySYBSpecMatchesPlainYeekeText(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "", TargetSize: "L", CreatedAt: t1(-1)}}
+	returns := []ReturnCandidate{{ReturnItemID: 900, ItemID: "100", VariationName: "L", DestroyDeadline: t1(10)}}
+	out := SelectMatches(products, returns, now)
+	if !out[0].Matched || out[0].ReturnItemID != 900 {
+		t.Fatalf("size-only spec should still match: %+v", out[0])
+	}
+}
+
+func TestSelectMatches_DifferentItemIDNeverMatches(t *testing.T) {
+	now := t1(0)
+	products := []SYBCandidate{{SYBProductID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", CreatedAt: t1(-1)}}
+	returns := []ReturnCandidate{{ReturnItemID: 900, ItemID: "200", VariationName: "白色,L", DestroyDeadline: t1(10)}}
+	out := SelectMatches(products, returns, now)
+	if out[0].Matched {
+		t.Fatalf("different shopee item id must never match: %+v", out[0])
+	}
+}

server/app/goauto/returnmatch/handler.go

@@ -0,0 +1,259 @@
+package returnmatch
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+
+	"go-admin/app/goauto/models"
+
+	"github.com/gin-gonic/gin"
+	"github.com/go-admin-team/go-admin-core/sdk/pkg"
+	jwt "github.com/go-admin-team/go-admin-core/sdk/pkg/jwtauth"
+	"gorm.io/gorm"
+)
+
+// Handler exposes the #338 return-matching admin surface: manual batch
+// match, list/filter (shared by the SYB product page and the yeeke returns
+// page), detail, confirm, cancel and remark. Everything here only reads or
+// writes GoAuto's own database — no yeeke or SYB write call is made.
+type Handler struct {
+	DB *gorm.DB
+}
+
+func (h Handler) db(c *gin.Context) (*gorm.DB, bool) {
+	db := h.DB
+	var err error
+	if db == nil {
+		db, err = pkg.GetOrm(c)
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return nil, false
+	}
+	return db, true
+}
+
+func operatorFromContext(c *gin.Context) (string, string) {
+	claims := jwt.ExtractClaims(c)
+	role, _ := claims["rolekey"].(string)
+	username, _ := claims["username"].(string)
+	if username == "" {
+		username, _ = claims["userName"].(string)
+	}
+	return role, username
+}
+
+// requireCanPurchase mirrors the admin/purchaser/after-sales write gate this codebase
+// already uses for other manual-trigger actions (yeeke.Handler.TriggerSync,
+// sybimport.Handler.Import): trigger match, confirm, cancel and remark are
+// writes and require it; the two list/detail read endpoints do not.
+func requireCanPurchase(c *gin.Context) bool {
+	role, _ := operatorFromContext(c)
+	if role != "admin" && role != "purchaser" && role != "after_sales" {
+		c.JSON(http.StatusForbidden, gin.H{"code": "FORBIDDEN", "message": "只有管理员、采购员或售后可以操作退货匹配"})
+		return false
+	}
+	return true
+}
+
+type batchMatchBody struct {
+	SYBProductIDs []uint64 `json:"sybProductIds"`
+}
+
+// BatchMatch is the「匹配退货」button: manual-only trigger for ticked rows.
+func (h Handler) BatchMatch(c *gin.Context) {
+	if !requireCanPurchase(c) {
+		return
+	}
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	var body batchMatchBody
+	if err := c.ShouldBindJSON(&body); err != nil || len(body.SYBProductIDs) == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "sybProductIds 不能为空"})
+		return
+	}
+	_, operator := operatorFromContext(c)
+	resp, err := NewService(db).BatchMatch(c.Request.Context(), BatchMatchRequest{SYBProductIDs: body.SYBProductIDs, Operator: operator})
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": resp})
+}
+
+// List backs both the SYB product page's匹配列/筛选 and the yeeke returns
+// page's占用状态筛选/列 (issue #338 pages section).
+func (h Handler) List(c *gin.Context) {
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	filter := ListFilter{Status: c.Query("status")}
+	if raw := c.QueryArray("sybProductId"); len(raw) > 0 {
+		filter.SYBProductIDs = parseUint64List(raw)
+	}
+	if raw := c.QueryArray("yeekeReturnItemId"); len(raw) > 0 {
+		filter.YeekeReturnItemIDs = parseUint64List(raw)
+	}
+	rows, err := NewService(db).List(c.Request.Context(), filter)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{"items": rows}})
+}
+
+func (h Handler) Detail(c *gin.Context) {
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "id 无效"})
+		return
+	}
+	detail, err := NewService(db).Detail(c.Request.Context(), id)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"code": "NOT_FOUND", "message": "匹配记录不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": detail})
+}
+
+func (h Handler) Confirm(c *gin.Context) {
+	h.transition(c, func(s *Service, ctx *gin.Context, id uint64, operator string) (models.ReturnMatch, error) {
+		return s.Confirm(ctx.Request.Context(), id, operator)
+	})
+}
+
+func (h Handler) Cancel(c *gin.Context) {
+	h.transition(c, func(s *Service, ctx *gin.Context, id uint64, operator string) (models.ReturnMatch, error) {
+		return s.Cancel(ctx.Request.Context(), id, operator)
+	})
+}
+
+func (h Handler) transition(c *gin.Context, fn func(*Service, *gin.Context, uint64, string) (models.ReturnMatch, error)) {
+	if !requireCanPurchase(c) {
+		return
+	}
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "id 无效"})
+		return
+	}
+	_, operator := operatorFromContext(c)
+	match, err := fn(NewService(db), c, id, operator)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"code": "NOT_FOUND", "message": "匹配记录不存在"})
+			return
+		}
+		if errors.Is(err, errStateConflict) {
+			c.JSON(http.StatusConflict, gin.H{"code": "STATE_CONFLICT", "message": "匹配状态已变化，请刷新后重试"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{"item": match}})
+}
+
+type remarkBody struct {
+	Remark string `json:"remark"`
+}
+
+func (h Handler) Remark(c *gin.Context) {
+	if !requireCanPurchase(c) {
+		return
+	}
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "id 无效"})
+		return
+	}
+	var body remarkBody
+	if err := c.ShouldBindJSON(&body); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "请求体无效"})
+		return
+	}
+	_, operator := operatorFromContext(c)
+	match, err := NewService(db).Remark(c.Request.Context(), id, operator, body.Remark)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"code": "NOT_FOUND", "message": "匹配记录不存在"})
+			return
+		}
+		if errors.Is(err, errRemarkTooLong) {
+			c.JSON(http.StatusBadRequest, gin.H{"code": "REMARK_TOO_LONG", "message": "备注不能超过 500 字"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{"item": match}})
+}
+
+func parseUint64List(raw []string) []uint64 {
+	out := make([]uint64, 0, len(raw))
+	for _, v := range raw {
+		if id, err := strconv.ParseUint(v, 10, 64); err == nil {
+			out = append(out, id)
+		}
+	}
+	return out
+}
+
+// ListBatches returns recent 「匹配退货」 batch records (who, when, submitted
+// and matched counts); pass withItems=1 to include each row's outcome.
+func (h Handler) ListBatches(c *gin.Context) {
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	limit, _ := strconv.Atoi(c.Query("limit"))
+	rows, err := NewService(db).ListBatches(c.Request.Context(), limit, c.Query("withItems") == "1")
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{"items": rows}})
+}
+
+// GetBatch returns one batch record with every submitted SYB product's outcome.
+func (h Handler) GetBatch(c *gin.Context) {
+	db, ok := h.db(c)
+	if !ok {
+		return
+	}
+	id, err := strconv.ParseUint(c.Param("batchId"), 10, 64)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "batchId 无效"})
+		return
+	}
+	rec, err := NewService(db).GetBatch(c.Request.Context(), id)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"code": "NOT_FOUND", "message": "批量匹配记录不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"code": 200, "data": rec})
+}

server/app/goauto/returnmatch/missing_test.go

@@ -0,0 +1,158 @@
+package returnmatch
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"go-admin/app/goauto/models"
+)
+
+// TestBatchMatch_MissingItemNotMatched: a return item whose sync_status is
+// "missing" (#338: dropped from a COMPLETE yeeke sync) must never be offered
+// to matching, even though it otherwise satisfies every other rule (an
+// eligible SYB candidate, a future destroy deadline, no active match).
+func TestBatchMatch_MissingItemNotMatched(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	ret := seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	now := time.Now().UTC()
+	if err := db.Model(&models.YeekeReturnItem{}).Where("id = ?", ret.ID).
+		Updates(map[string]any{"sync_status": "missing", "missing_since": now}).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "tester"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 0 || resp.SkippedCount != 1 {
+		t.Fatalf("expected the missing item to be skipped, not matched: %+v", resp)
+	}
+	if resp.Items[0].ReasonCode != ReasonNoCandidate {
+		t.Fatalf("expected no_candidate (the only candidate is missing): %+v", resp.Items[0])
+	}
+}
+
+// TestBatchMatch_MissingPackageNotMatched: same as above but the ITEM itself
+// is still "ok" while its PACKAGE is "missing" — availableReturnPool must
+// exclude it too, since #338's rule is "an item, or an item whose package,
+// is no longer ok".
+func TestBatchMatch_MissingPackageNotMatched(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	ret := seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	now := time.Now().UTC()
+	if err := db.Model(&models.YeekeReturnPackage{}).Where("id = ?", ret.PackageID).
+		Updates(map[string]any{"sync_status": "missing", "missing_since": now}).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "tester"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 0 || resp.SkippedCount != 1 {
+		t.Fatalf("expected the item to be skipped because its package is missing: %+v", resp)
+	}
+}
+
+// TestActiveMatchSurvivesItemGoingMissing: issue #338's rule 6 — an existing
+// active match is NOT auto-cancelled when its return item later becomes
+// missing. Detail() must still report it (SYB side unaffected) and surface
+// the yeeke side's syncStatus="missing" so the UI can show the warning.
+func TestActiveMatchSurvivesItemGoingMissing(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	ret := seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "tester"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 1 {
+		t.Fatalf("expected a match before the item goes missing: %+v", resp)
+	}
+	matchID := resp.Items[0].MatchID
+
+	// The return item now drops out of a COMPLETE yeeke sync.
+	missingSince := time.Now().UTC()
+	if err := db.Model(&models.YeekeReturnItem{}).Where("id = ?", ret.ID).
+		Updates(map[string]any{"sync_status": "missing", "missing_since": missingSince}).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	var match models.ReturnMatch
+	if err := db.First(&match, matchID).Error; err != nil {
+		t.Fatal(err)
+	}
+	if match.Status != models.ReturnMatchStatusMatched || match.ActiveYeekeReturnItemID == nil {
+		t.Fatalf("existing match must stay active when its return item goes missing, got %+v", match)
+	}
+
+	detail, err := s.Detail(context.Background(), matchID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if detail.Yeeke == nil {
+		t.Fatal("Detail must still resolve the yeeke side (the row was never deleted)")
+	}
+	if detail.Yeeke.SyncStatus != "missing" || detail.Yeeke.MissingSince == nil {
+		t.Fatalf("Detail must report the return item's syncStatus=missing, got %+v", detail.Yeeke)
+	}
+	if detail.SYB == nil || detail.SYB.SYBProductID != syb.ID {
+		t.Fatalf("SYB side must be unaffected by the return item going missing, got %+v", detail.SYB)
+	}
+}
+
+// TestList_ReportsMissingReturnSyncStatus: the SYB products match column and
+// the compare dialog read List()'s syncStatus/missingSince fields (#338); a
+// match whose return item is missing must carry them through.
+func TestList_ReportsMissingReturnSyncStatus(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	ret := seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "tester"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 1 {
+		t.Fatalf("expected a match: %+v", resp)
+	}
+
+	missingSince := time.Now().UTC()
+	if err := db.Model(&models.YeekeReturnItem{}).Where("id = ?", ret.ID).
+		Updates(map[string]any{"sync_status": "missing", "missing_since": missingSince}).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	items, err := s.List(context.Background(), ListFilter{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) != 1 {
+		t.Fatalf("expected one list row, got %d", len(items))
+	}
+	if items[0].SyncStatus != "missing" || items[0].MissingSince == nil {
+		t.Fatalf("List() must surface the missing return item's status, got %+v", items[0])
+	}
+}

server/app/goauto/returnmatch/normalize.go

@@ -0,0 +1,119 @@
+// Package returnmatch implements the #338 return-matching algorithm: pairing
+// a SYB order product with an available yeeke return item that is the same
+// Shopee item with the same spec, so the return can be reused instead of
+// buying the item again. This file holds only pure, DB-free functions so the
+// matching rules can be unit tested directly against the 840 real pairs used
+// to design the normalization rule (see issue #338 "当前事实").
+package returnmatch
+
+import "strings"
+
+// bracketPairs lists every bracket style issue #338 requires stripped, along
+// with its contained content: 【】（）() and [].
+var bracketPairs = []struct{ open, close rune }{
+	{'【', '】'},
+	{'（', '）'},
+	{'(', ')'},
+	{'[', ']'},
+}
+
+// stripBracketedContent removes every bracket-delimited span (any style in
+// bracketPairs) and its contents. Unmatched opening brackets discard the
+// remainder of the string from that point, which is safe here because SYB
+// and yeeke free-text specs never rely on a trailing unmatched bracket to
+// carry meaningful spec content.
+func stripBracketedContent(s string) string {
+	var b strings.Builder
+	depth := 0
+	for _, r := range s {
+		isOpen, isClose := false, false
+		for _, pair := range bracketPairs {
+			if r == pair.open {
+				isOpen = true
+			}
+			if r == pair.close {
+				isClose = true
+			}
+		}
+		switch {
+		case isOpen:
+			depth++
+		case isClose:
+			if depth > 0 {
+				depth--
+			}
+		case depth == 0:
+			b.WriteRune(r)
+		}
+	}
+	return b.String()
+}
+
+// fullwidthToHalfwidth converts fullwidth ASCII forms (U+FF01-U+FF5E) and the
+// fullwidth space (U+3000) to their halfwidth equivalents, leaving CJK
+// characters (colors like 紫色) untouched.
+func fullwidthToHalfwidth(s string) string {
+	var b strings.Builder
+	for _, r := range s {
+		switch {
+		case r == '　':
+			b.WriteRune(' ')
+		case r >= '！' && r <= '～':
+			b.WriteRune(r - 0xFEE0)
+		default:
+			b.WriteRune(r)
+		}
+	}
+	return b.String()
+}
+
+// Normalize implements issue #338's spec-text normalization rule: strip
+// bracketed remarks (【】（）()[] and their content), strip whitespace,
+// convert fullwidth characters to halfwidth, and lowercase. It is used on
+// both the SYB side (target_color + "," + target_size) and the yeeke side
+// (variation_name) so the two can be compared for equality.
+func Normalize(raw string) string {
+	s := stripBracketedContent(raw)
+	s = fullwidthToHalfwidth(s)
+	s = strings.ToLower(s)
+	var b strings.Builder
+	for _, r := range s {
+		if !isSpace(r) {
+			b.WriteRune(r)
+		}
+	}
+	return b.String()
+}
+
+func isSpace(r rune) bool {
+	switch r {
+	case ' ', '\t', '\n', '\r', '\f', '\v', ' ':
+		return true
+	}
+	return false
+}
+
+// SYBSpecText builds the SYB-side comparable spec text from the parser's
+// target_color/target_size fields, per issue #338's data design. Only
+// non-empty parts are joined so a single-dimension spec (color-only or
+// size-only) doesn't pick up a stray leading/trailing comma that would
+// prevent it from normalizing equal to the yeeke side's single-value
+// variation_name (e.g. SYBSpecText("黑色", "") must be "黑色", not "黑色,").
+func SYBSpecText(targetColor, targetSize string) string {
+	parts := make([]string, 0, 2)
+	if targetColor != "" {
+		parts = append(parts, targetColor)
+	}
+	if targetSize != "" {
+		parts = append(parts, targetSize)
+	}
+	return strings.Join(parts, ",")
+}
+
+// trimCommas removes leading/trailing commas left over after normalization
+// (e.g. a source value that itself started or ended with a comma). Used only
+// when building the matching key, so exact-text comparisons/tests elsewhere
+// are unaffected.
+func trimCommas(s string) string {
+	return strings.Trim(s, ",")
+}

server/app/goauto/returnmatch/normalize_test.go

@@ -0,0 +1,78 @@
+package returnmatch
+
+import "testing"
+
+func TestNormalize(t *testing.T) {
+	cases := []struct {
+		name string
+		in   string
+		want string
+	}{
+		{"square brackets with content", "白色,2XL【建議65-75公斤】", "白色,2xl"},
+		{"chinese parens", "紫色,Ｍ（建議43-53公斤）", "紫色,m"},
+		{"ascii parens", "紫色,M (建議43-53公斤)", "紫色,m"},
+		{"latin square brackets", "紫色,M [建議43-53公斤]", "紫色,m"},
+		{"internal whitespace stripped", "紫色, M  【建議43-53公斤】", "紫色,m"},
+		{"fullwidth digits and letters", "白色，２ＸＬ", "白色,2xl"},
+		{"no bracket, plain", "黑色,L", "黑色,l"},
+		{"empty", "", ""},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			got := Normalize(tc.in)
+			if got != tc.want {
+				t.Fatalf("Normalize(%q) = %q, want %q", tc.in, got, tc.want)
+			}
+		})
+	}
+}
+
+func TestNormalizeMatchesRealPairSample(t *testing.T) {
+	// Representative real pairs from issue #338's local 840-pair backtest
+	// note: SYB target_color+","+target_size vs yeeke variation_name should
+	// normalize equal once bracketed remarks are stripped.
+	pairs := []struct{ syb, yeeke string }{
+		{SYBSpecText("白色", "2XL"), "白色,2XL【建議65-75公斤】"},
+		{SYBSpecText("紫色", "M"), "紫色,M【建議43-53公斤】"},
+		{SYBSpecText("黑色", "L"), "黑色,L"},
+	}
+	for _, p := range pairs {
+		if Normalize(p.syb) != Normalize(p.yeeke) {
+			t.Fatalf("expected normalized equality: syb=%q (%q) yeeke=%q (%q)",
+				p.syb, Normalize(p.syb), p.yeeke, Normalize(p.yeeke))
+		}
+	}
+}
+
+func TestSYBSpecText(t *testing.T) {
+	if got := SYBSpecText("白色", "2XL"); got != "白色,2XL" {
+		t.Fatalf("got %q", got)
+	}
+}
+
+func TestSYBSpecText_SingleDimension(t *testing.T) {
+	if got := SYBSpecText("黑色", ""); got != "黑色" {
+		t.Fatalf("color-only: got %q, want %q (no trailing comma)", got, "黑色")
+	}
+	if got := SYBSpecText("", "L"); got != "L" {
+		t.Fatalf("size-only: got %q, want %q (no leading comma)", got, "L")
+	}
+	if got := SYBSpecText("", ""); got != "" {
+		t.Fatalf("both empty: got %q, want empty", got)
+	}
+}
+
+func TestTrimCommas(t *testing.T) {
+	cases := map[string]string{
+		"黑色,":  "黑色",
+		",黑色":  "黑色",
+		",黑色,": "黑色",
+		"黑色":   "黑色",
+		"":     "",
+	}
+	for in, want := range cases {
+		if got := trimCommas(in); got != want {
+			t.Fatalf("trimCommas(%q) = %q, want %q", in, got, want)
+		}
+	}
+}

server/app/goauto/returnmatch/router.go

@@ -0,0 +1,24 @@
+package returnmatch
+
+import (
+	"github.com/gin-gonic/gin"
+	jwt "github.com/go-admin-team/go-admin-core/sdk/pkg/jwtauth"
+)
+
+// InitRouter mounts the #338 return-matching admin surface. List/detail are
+// readable by any authenticated admin user; the write actions (batch match,
+// confirm, cancel, remark) additionally require admin/purchaser/after-sales via
+// requireCanPurchase, same gate as yeeke.Handler.TriggerSync.
+func InitRouter(engine *gin.Engine, auth *jwt.GinJWTMiddleware) {
+	handler := Handler{}
+	group := engine.Group("/api/admin/v1/return-matches").Use(auth.MiddlewareFunc())
+	group.GET("", handler.List)
+	// Static batch routes are registered before /:id so they never parse as a match id.
+	group.GET("/batches", handler.ListBatches)
+	group.GET("/batches/:batchId", handler.GetBatch)
+	group.GET("/:id", handler.Detail)
+	group.POST("/batch-match", handler.BatchMatch)
+	group.POST("/:id/confirm", handler.Confirm)
+	group.POST("/:id/cancel", handler.Cancel)
+	group.POST("/:id/remark", handler.Remark)
+}

server/app/goauto/returnmatch/service.go

@@ -0,0 +1,638 @@
+package returnmatch
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log"
+	"strings"
+	"time"
+	"unicode/utf8"
+
+	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/purchase"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+func clauseLockUpdate() clause.Locking { return clause.Locking{Strength: "UPDATE"} }
+
+// participatingStages is issue #338 rule 1's "待采购范围": 待人工处理 is
+// explicitly excluded (already matched, per the confirmed rule), as are the
+// stages that mean a task is already in flight or a match already exists.
+var participatingStages = map[string]bool{
+	purchase.ProcessStagePDDUnlinked:       true,
+	purchase.ProcessStagePDDPending:        true,
+	purchase.ProcessStagePDDCollecting:     true,
+	purchase.ProcessStagePDDCollectionFail: true,
+	purchase.ProcessStageColorMapping:      true,
+	purchase.ProcessStagePurchaseReady:     true,
+}
+
+type Service struct {
+	DB  *gorm.DB
+	Now func() time.Time
+}
+
+func NewService(db *gorm.DB) *Service {
+	return &Service{DB: db, Now: time.Now}
+}
+
+// BatchMatchRequest/Result mirror the prototype's batch result dialog
+// (screen 2): per-SYB-product outcome plus a reason bucket count.
+type BatchMatchRequest struct {
+	SYBProductIDs []uint64
+	Operator      string
+}
+
+type BatchMatchItem struct {
+	SYBProductID uint64 `json:"sybProductId"`
+	Matched      bool   `json:"matched"`
+	ReasonCode   string `json:"reasonCode,omitempty"`
+	Reason       string `json:"reason,omitempty"`
+	MatchID      uint64 `json:"matchId,omitempty"`
+}
+
+type BatchMatchResponse struct {
+	Items          []BatchMatchItem `json:"items"`
+	ProcessedCount int              `json:"processedCount"`
+	MatchedCount   int              `json:"matchedCount"`
+	SkippedCount   int              `json:"skippedCount"`
+}
+
+const (
+	ReasonStageIneligible = "stage_ineligible"
+	ReasonNoCandidate     = "no_candidate"
+	ReasonConflict        = "conflict"
+)
+
+// BatchMatch implements issue #338's manual "匹配退货" trigger. It is only
+// ever called from the batch-match button (ticked rows) — no scheduler, no
+// yeeke-sync/SYB-import hook calls this (rule: 手动触发, 无定时任务).
+func (s *Service) BatchMatch(ctx context.Context, req BatchMatchRequest) (BatchMatchResponse, error) {
+	resp, err := s.batchMatch(ctx, req)
+	if len(req.SYBProductIDs) > 0 {
+		// The batch record is written after the per-row transactions have
+		// committed, so a failure here must not turn an already-applied
+		// match into an error response; it is logged instead.
+		if logErr := s.recordBatch(ctx, req, resp, err); logErr != nil {
+			log.Printf("return match batch record failed: operator=%s submitted=%d: %v", req.Operator, len(req.SYBProductIDs), logErr)
+		}
+	}
+	return resp, err
+}
+
+// recordBatch stores one ReturnMatchBatch row describing this click of
+// 「匹配退货」: submitted SYB products in order and each one's outcome.
+func (s *Service) recordBatch(ctx context.Context, req BatchMatchRequest, resp BatchMatchResponse, batchErr error) error {
+	items := resp.Items
+	if items == nil {
+		items = []BatchMatchItem{}
+	}
+	raw, err := json.Marshal(items)
+	if err != nil {
+		return err
+	}
+	row := models.ReturnMatchBatch{
+		Operator:       req.Operator,
+		SubmittedCount: len(req.SYBProductIDs),
+		MatchedCount:   resp.MatchedCount,
+		SkippedCount:   resp.SkippedCount,
+		ItemsJSON:      string(raw),
+	}
+	if batchErr != nil {
+		row.Error = truncateRunes(batchErr.Error(), 500)
+	}
+	return s.DB.WithContext(ctx).Create(&row).Error
+}
+
+func truncateRunes(v string, max int) string {
+	r := []rune(v)
+	if len(r) <= max {
+		return v
+	}
+	return string(r[:max])
+}
+
+// BatchRecord is the API view of one ReturnMatchBatch row.
+type BatchRecord struct {
+	models.ReturnMatchBatch
+	Items []BatchMatchItem `json:"items,omitempty"`
+}
+
+// ListBatches returns the most recent batch records, newest first; items are
+// only expanded when withItems is true to keep the list response small.
+func (s *Service) ListBatches(ctx context.Context, limit int, withItems bool) ([]BatchRecord, error) {
+	if limit <= 0 || limit > 100 {
+		limit = 20
+	}
+	var rows []models.ReturnMatchBatch
+	if err := s.DB.WithContext(ctx).Order("id DESC").Limit(limit).Find(&rows).Error; err != nil {
+		return nil, err
+	}
+	out := make([]BatchRecord, 0, len(rows))
+	for _, row := range rows {
+		rec := BatchRecord{ReturnMatchBatch: row}
+		if withItems {
+			if err := json.Unmarshal([]byte(row.ItemsJSON), &rec.Items); err != nil {
+				return nil, err
+			}
+		}
+		out = append(out, rec)
+	}
+	return out, nil
+}
+
+// GetBatch returns one batch record with its items expanded.
+func (s *Service) GetBatch(ctx context.Context, id uint64) (BatchRecord, error) {
+	var row models.ReturnMatchBatch
+	if err := s.DB.WithContext(ctx).First(&row, id).Error; err != nil {
+		return BatchRecord{}, err
+	}
+	rec := BatchRecord{ReturnMatchBatch: row}
+	if err := json.Unmarshal([]byte(row.ItemsJSON), &rec.Items); err != nil {
+		return BatchRecord{}, err
+	}
+	return rec, nil
+}
+
+func (s *Service) batchMatch(ctx context.Context, req BatchMatchRequest) (BatchMatchResponse, error) {
+	resp := BatchMatchResponse{Items: make([]BatchMatchItem, 0, len(req.SYBProductIDs))}
+	if len(req.SYBProductIDs) == 0 {
+		return resp, nil
+	}
+
+	var sybProducts []models.SYBProduct
+	if err := s.DB.WithContext(ctx).Where("id IN ?", req.SYBProductIDs).Find(&sybProducts).Error; err != nil {
+		return resp, err
+	}
+	sybByID := make(map[uint64]models.SYBProduct, len(sybProducts))
+	for _, p := range sybProducts {
+		sybByID[p.ID] = p
+	}
+
+	stages, err := purchase.NewService(s.DB).ProcessStages(ctx, req.SYBProductIDs)
+	if err != nil {
+		return resp, err
+	}
+
+	now := s.Now()
+	eligible := make([]SYBCandidate, 0, len(req.SYBProductIDs))
+	skipped := make(map[uint64]string)
+	for _, id := range req.SYBProductIDs {
+		syb, ok := sybByID[id]
+		if !ok {
+			skipped[id] = "SYB 商品不存在或已删除"
+			continue
+		}
+		stage := stages[id]
+		if !participatingStages[stage.Stage] {
+			skipped[id] = "该处理阶段不参与匹配：" + stage.Label
+			continue
+		}
+		eligible = append(eligible, SYBCandidate{
+			SYBProductID: syb.ID, ShopeeItemID: syb.ShopeeItemID,
+			TargetColor: syb.TargetColor, TargetSize: syb.TargetSize, CreatedAt: syb.CreatedAt,
+		})
+	}
+	// Rule 4: process in SYB created_at DESC order.
+	sortSYBCandidatesDesc(eligible)
+
+	returns, err := s.availableReturnPool(ctx)
+	if err != nil {
+		return resp, err
+	}
+
+	outcomes := SelectMatches(eligible, returns, now)
+	outcomeBySYB := make(map[uint64]MatchOutcome, len(outcomes))
+	for _, o := range outcomes {
+		outcomeBySYB[o.SYBProductID] = o
+	}
+
+	for _, id := range req.SYBProductIDs {
+		if reason, isSkip := skipped[id]; isSkip {
+			resp.Items = append(resp.Items, BatchMatchItem{SYBProductID: id, Matched: false, ReasonCode: ReasonStageIneligible, Reason: reason})
+			resp.SkippedCount++
+			continue
+		}
+		outcome, ok := outcomeBySYB[id]
+		if !ok || !outcome.Matched {
+			resp.Items = append(resp.Items, BatchMatchItem{SYBProductID: id, Matched: false, ReasonCode: ReasonNoCandidate, Reason: "没有满足条件的退货商品"})
+			resp.SkippedCount++
+			continue
+		}
+		match, insertErr := s.matchOneWithLock(ctx, id, outcome, req.Operator)
+		if insertErr != nil {
+			if errors.Is(insertErr, errStageNoLongerEligible) {
+				// #338 review fix: the stage was re-checked under the same
+				// FOR UPDATE lock purchase.create takes, right before insert.
+				// A purchase task could have been created for this row
+				// between the outer screening pass above and this point;
+				// when that happens the product is no longer in a
+				// participating stage and this row is skipped, not matched.
+				resp.Items = append(resp.Items, BatchMatchItem{SYBProductID: id, Matched: false, ReasonCode: ReasonStageIneligible, Reason: "处理阶段已变化，不再参与匹配"})
+				resp.SkippedCount++
+				continue
+			}
+			if isUniqueConstraintErr(insertErr) {
+				// Rule 7 / acceptance item 9: a concurrent insert lost the
+				// race for either side — skip this row and report it, never
+				// fail the whole batch.
+				resp.Items = append(resp.Items, BatchMatchItem{SYBProductID: id, Matched: false, ReasonCode: ReasonConflict, Reason: "并发匹配冲突，该商品或退货商品已被占用"})
+				resp.SkippedCount++
+				continue
+			}
+			return resp, insertErr
+		}
+		resp.Items = append(resp.Items, BatchMatchItem{SYBProductID: id, Matched: true, MatchID: match.ID})
+		resp.MatchedCount++
+	}
+	resp.ProcessedCount = len(resp.Items)
+	return resp, nil
+}
+
+func sortSYBCandidatesDesc(items []SYBCandidate) {
+	for i := 1; i < len(items); i++ {
+		for j := i; j > 0 && items[j].CreatedAt.After(items[j-1].CreatedAt); j-- {
+			items[j], items[j-1] = items[j-1], items[j]
+		}
+	}
+}
+
+// availableReturnPool loads every yeeke return item with no active match and
+// a destroy deadline (rule 2: empty deadline is unavailable, handled by the
+// NULL exclusion below; "later than now" is enforced by SelectMatches).
+// #338 scope addition: an item, or an item whose package, is no longer
+// sync_status="ok" (i.e. a COMPLETE yeeke sync stopped seeing it) is
+// excluded here so matching never offers a return yeeke has dropped.
+func (s *Service) availableReturnPool(ctx context.Context) ([]ReturnCandidate, error) {
+	var rows []struct {
+		ID              uint64
+		ItemID          string
+		VariationName   string
+		DestroyDeadLine *time.Time
+	}
+	err := s.DB.WithContext(ctx).Table("yeeke_return_item AS i").
+		Select("i.id AS id, i.item_id AS item_id, i.variation_name AS variation_name, p.destroy_dead_line AS destroy_dead_line").
+		Joins("JOIN yeeke_return_package AS p ON p.id = i.package_id").
+		Joins("LEFT JOIN return_match AS m ON m.active_yeeke_return_item_id = i.id").
+		Where("m.id IS NULL AND i.sync_status = ? AND p.sync_status = ?", "ok", "ok").
+		Find(&rows).Error
+	if err != nil {
+		return nil, err
+	}
+	out := make([]ReturnCandidate, 0, len(rows))
+	for _, r := range rows {
+		if r.DestroyDeadLine == nil {
+			continue
+		}
+		out = append(out, ReturnCandidate{ReturnItemID: r.ID, ItemID: r.ItemID, VariationName: r.VariationName, DestroyDeadline: *r.DestroyDeadLine})
+	}
+	return out, nil
+}
+
+// errStageNoLongerEligible is returned by matchOneWithLock when the SYB
+// product's process stage, re-checked under lock immediately before insert,
+// is no longer in participatingStages — e.g. a purchase task was created for
+// it between BatchMatch's outer screening pass and this point (#338 review
+// fix: race between matching and purchase creation).
+var errStageNoLongerEligible = errors.New("syb product stage no longer participates in matching")
+
+// matchOneWithLock takes the SAME row lock purchase.Service.create takes on
+// syb_product (clause.Locking{Strength: "UPDATE"}) and re-computes the
+// process stage inside that transaction via purchase.NewService(tx) before
+// inserting the match, so a purchase task creation racing with this batch
+// match can never both succeed: whichever gets the row lock first commits,
+// and the other sees the now-current state (an active return_match row, or
+// a task_created/order_review/purchase_succeeded stage) and is rejected/
+// skipped instead of double-committing an inconsistent state.
+func (s *Service) matchOneWithLock(ctx context.Context, sybID uint64, outcome MatchOutcome, operator string) (models.ReturnMatch, error) {
+	var match models.ReturnMatch
+	err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var syb models.SYBProduct
+		if err := tx.Clauses(clauseLockUpdate()).First(&syb, sybID).Error; err != nil {
+			return err
+		}
+		stages, err := purchase.NewService(tx).ProcessStages(ctx, []uint64{sybID})
+		if err != nil {
+			return err
+		}
+		stage := stages[sybID]
+		if !participatingStages[stage.Stage] {
+			return errStageNoLongerEligible
+		}
+		var returnItem models.YeekeReturnItem
+		if err := tx.First(&returnItem, outcome.ReturnItemID).Error; err != nil {
+			return err
+		}
+		sybIDCopy := syb.ID
+		returnIDCopy := outcome.ReturnItemID
+		deadline := outcome.DestroyDeadline
+		now := s.Now()
+		match = models.ReturnMatch{
+			SYBProductID: sybIDCopy, YeekeReturnItemID: returnIDCopy,
+			ActiveSYBProductID: &sybIDCopy, ActiveYeekeReturnItemID: &returnIDCopy,
+			Status:                  models.ReturnMatchStatusMatched,
+			SYBSpecText:             SYBSpecText(syb.TargetColor, syb.TargetSize),
+			YeekeSpecText:           returnItem.VariationName,
+			NormalizedKey:           outcome.NormalizedKey,
+			PreviousProcessStage:    stage.Stage,
+			MatchedBy:               operator,
+			MatchedAt:               now,
+			DestroyDeadlineSnapshot: &deadline,
+		}
+		if err := tx.Create(&match).Error; err != nil {
+			return err
+		}
+		logRow := models.ReturnMatchLog{
+			MatchID: match.ID, Action: models.ReturnMatchLogActionMatched, Operator: operator,
+			Detail: fmt.Sprintf("匹配退货商品 #%d（%s），此前处理阶段：%s", returnIDCopy, returnItem.VariationName, stage.Label),
+		}
+		return tx.Create(&logRow).Error
+	})
+	return match, err
+}
+
+func isUniqueConstraintErr(err error) bool {
+	msg := strings.ToLower(err.Error())
+	return strings.Contains(msg, "unique") || strings.Contains(msg, "duplicate")
+}
+
+// Confirm/Cancel/Remark implement the human-review half of issue #338.
+
+func (s *Service) Confirm(ctx context.Context, matchID uint64, operator string) (models.ReturnMatch, error) {
+	var match models.ReturnMatch
+	err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if err := tx.Clauses(clauseLockUpdate()).First(&match, matchID).Error; err != nil {
+			return err
+		}
+		if match.Status != models.ReturnMatchStatusMatched {
+			return errStateConflict
+		}
+		now := s.Now()
+		match.Status = models.ReturnMatchStatusConfirmed
+		match.ConfirmedBy = operator
+		match.ConfirmedAt = &now
+		if err := tx.Save(&match).Error; err != nil {
+			return err
+		}
+		return tx.Create(&models.ReturnMatchLog{MatchID: match.ID, Action: models.ReturnMatchLogActionConfirmed, Operator: operator, Detail: "确认匹配，商品状态变为已用退货"}).Error
+	})
+	return match, err
+}
+
+// Cancel restores the SYB product to purchasable (by clearing
+// ActiveSYBProductID) and returns the return item to the eligible pool (by
+// clearing ActiveYeekeReturnItemID), from either matched or confirmed state,
+// per issue #338 rule: 取消匹配后再次点击「匹配退货」若配回同一对，允许.
+func (s *Service) Cancel(ctx context.Context, matchID uint64, operator string) (models.ReturnMatch, error) {
+	var match models.ReturnMatch
+	err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if err := tx.Clauses(clauseLockUpdate()).First(&match, matchID).Error; err != nil {
+			return err
+		}
+		if match.Status == models.ReturnMatchStatusCancelled {
+			return errStateConflict
+		}
+		now := s.Now()
+		match.Status = models.ReturnMatchStatusCancelled
+		match.ActiveSYBProductID = nil
+		match.ActiveYeekeReturnItemID = nil
+		match.CancelledBy = operator
+		match.CancelledAt = &now
+		if err := tx.Save(&match).Error; err != nil {
+			return err
+		}
+		return tx.Create(&models.ReturnMatchLog{MatchID: match.ID, Action: models.ReturnMatchLogActionCancelled, Operator: operator, Detail: "取消匹配，SYB 商品恢复可采购，退货商品回到可用池"}).Error
+	})
+	return match, err
+}
+
+// errRemarkTooLong is returned instead of silently truncating; remark is a
+// varchar(500) column and MySQL VARCHAR length is a character count, so this
+// checks runes, not bytes.
+var errRemarkTooLong = errors.New("remark exceeds 500 characters")
+
+const maxRemarkLength = 500
+
+func (s *Service) Remark(ctx context.Context, matchID uint64, operator, remark string) (models.ReturnMatch, error) {
+	if utf8.RuneCountInString(remark) > maxRemarkLength {
+		return models.ReturnMatch{}, errRemarkTooLong
+	}
+	var match models.ReturnMatch
+	err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if err := tx.First(&match, matchID).Error; err != nil {
+			return err
+		}
+		match.Remark = remark
+		if err := tx.Save(&match).Error; err != nil {
+			return err
+		}
+		return tx.Create(&models.ReturnMatchLog{MatchID: match.ID, Action: models.ReturnMatchLogActionRemark, Operator: operator, Detail: remark}).Error
+	})
+	return match, err
+}
+
+// List supports both admin pages' filter/column needs: by SYB product ids,
+// by yeeke return item ids, or by status.
+type ListFilter struct {
+	SYBProductIDs      []uint64
+	YeekeReturnItemIDs []uint64
+	Status             string
+}
+
+// ListItem is one row of List's result: the match itself plus a few display
+// fields the SYB product page's match column needs (thumbnail, return order
+// sn, spec) so it never has to issue a second request per row.
+type ListItem struct {
+	models.ReturnMatch
+	OrderSN         string     `json:"orderSn,omitempty"`
+	Image           string     `json:"image,omitempty"`
+	VariationName   string     `json:"variationName,omitempty"`
+	DestroyDeadline *time.Time `json:"destroyDeadline,omitempty"`
+	// SyncStatus/MissingSince (#338) surface the yeeke return item's own
+	// current availability ("ok"/"missing") so the SYB products match column
+	// and the compare dialog can warn even on an existing, already-matched
+	// pair whose return later dropped out of a COMPLETE yeeke sync.
+	SyncStatus   string     `json:"syncStatus,omitempty"`
+	MissingSince *time.Time `json:"missingSince,omitempty"`
+}
+
+func (s *Service) List(ctx context.Context, filter ListFilter) ([]ListItem, error) {
+	q := s.DB.WithContext(ctx).Model(&models.ReturnMatch{})
+	if len(filter.SYBProductIDs) > 0 {
+		q = q.Where("syb_product_id IN ?", filter.SYBProductIDs)
+	}
+	if len(filter.YeekeReturnItemIDs) > 0 {
+		q = q.Where("yeeke_return_item_id IN ?", filter.YeekeReturnItemIDs)
+	}
+	if filter.Status != "" {
+		q = q.Where("status = ?", filter.Status)
+	}
+	var rows []models.ReturnMatch
+	if err := q.Order("id DESC").Find(&rows).Error; err != nil {
+		return nil, err
+	}
+	items := make([]ListItem, len(rows))
+	returnIDs := make([]uint64, 0, len(rows))
+	for i, r := range rows {
+		items[i] = ListItem{ReturnMatch: r}
+		returnIDs = append(returnIDs, r.YeekeReturnItemID)
+	}
+	if len(returnIDs) == 0 {
+		return items, nil
+	}
+	// One bounded join query for every return item referenced on this page —
+	// never a per-row lookup.
+	var joined []struct {
+		ID               uint64
+		OrderSN          string
+		Image            string
+		VariationName    string
+		DestroyDeadLine  *time.Time
+		SyncStatus       string
+		MissingSince     *time.Time
+		PackageSyncStat  string     `gorm:"column:package_sync_status"`
+		PackageMissingAt *time.Time `gorm:"column:package_missing_since"`
+	}
+	if err := s.DB.WithContext(ctx).Table("yeeke_return_item AS i").
+		Select("i.id AS id, p.order_sn AS order_sn, i.image AS image, i.variation_name AS variation_name, p.destroy_dead_line AS destroy_dead_line, "+
+			"i.sync_status AS sync_status, i.missing_since AS missing_since, p.sync_status AS package_sync_status, p.missing_since AS package_missing_since").
+		Joins("JOIN yeeke_return_package AS p ON p.id = i.package_id").
+		Where("i.id IN ?", returnIDs).
+		Find(&joined).Error; err != nil {
+		return nil, err
+	}
+	type extraFields struct {
+		OrderSN         string
+		Image           string
+		VariationName   string
+		DestroyDeadLine *time.Time
+		SyncStatus      string
+		MissingSince    *time.Time
+	}
+	byID := make(map[uint64]extraFields, len(joined))
+	for _, j := range joined {
+		// A missing package makes its items unavailable too (#338), even
+		// if the item row itself is still "ok" — surface the package's
+		// missing_since in that case since it is the more accurate reason.
+		syncStatus, missingSince := j.SyncStatus, j.MissingSince
+		if j.PackageSyncStat != "ok" {
+			syncStatus, missingSince = j.PackageSyncStat, j.PackageMissingAt
+		}
+		byID[j.ID] = extraFields{j.OrderSN, j.Image, j.VariationName, j.DestroyDeadLine, syncStatus, missingSince}
+	}
+	for i := range items {
+		if extra, ok := byID[items[i].YeekeReturnItemID]; ok {
+			items[i].OrderSN = extra.OrderSN
+			items[i].Image = extra.Image
+			items[i].VariationName = extra.VariationName
+			items[i].DestroyDeadline = extra.DestroyDeadLine
+			items[i].SyncStatus = extra.SyncStatus
+			items[i].MissingSince = extra.MissingSince
+		}
+	}
+	return items, nil
+}
+
+// SYBDetailView/YeekeDetailView/MatchDetail back the prototype's compare
+// screen (screen 3): both sides' fields and images side by side, normalized
+// spec text for both, and the operation log.
+type SYBDetailView struct {
+	SYBProductID      uint64 `json:"sybProductId"`
+	OrderCode         string `json:"orderCode"`
+	ShopeeItemID      string `json:"shopeeItemId"`
+	ShopName          string `json:"shopName"`
+	ProductTitle      string `json:"productTitle"`
+	TargetColor       string `json:"targetColor"`
+	TargetSize        string `json:"targetSize"`
+	Quantity          int64  `json:"quantity"`
+	ImageURL          string `json:"imageUrl,omitempty"`
+	CurrentStage      string `json:"currentStage"`
+	CurrentStageLabel string `json:"currentStageLabel"`
+}
+
+type YeekeDetailView struct {
+	YeekeReturnItemID uint64     `json:"yeekeReturnItemId"`
+	OrderSN           string     `json:"orderSn"`
+	ItemID            string     `json:"itemId"`
+	VariationID       string     `json:"variationId"`
+	ShopName          string     `json:"shopName"`
+	ItemName          string     `json:"itemName"`
+	VariationName     string     `json:"variationName"`
+	Quantity          int64      `json:"quantity"`
+	Image             string     `json:"image,omitempty"`
+	DestroyDeadline   *time.Time `json:"destroyDeadline,omitempty"`
+	// SyncStatus/MissingSince (#338): "missing" when either the item or its
+	// package fell out of a COMPLETE yeeke sync, so the compare dialog can
+	// show the warning even on a match made before the item went missing.
+	SyncStatus   string     `json:"syncStatus"`
+	MissingSince *time.Time `json:"missingSince,omitempty"`
+}
+
+type MatchDetail struct {
+	Match               models.ReturnMatch      `json:"match"`
+	SYB                 *SYBDetailView          `json:"syb,omitempty"`
+	Yeeke               *YeekeDetailView        `json:"yeeke,omitempty"`
+	NormalizedSYBSpec   string                  `json:"normalizedSybSpec"`
+	NormalizedYeekeSpec string                  `json:"normalizedYeekeSpec"`
+	Logs                []models.ReturnMatchLog `json:"logs"`
+}
+
+func (s *Service) Detail(ctx context.Context, matchID uint64) (MatchDetail, error) {
+	var match models.ReturnMatch
+	if err := s.DB.WithContext(ctx).First(&match, matchID).Error; err != nil {
+		return MatchDetail{}, err
+	}
+	detail := MatchDetail{Match: match}
+
+	var syb models.SYBProduct
+	if err := s.DB.WithContext(ctx).First(&syb, match.SYBProductID).Error; err == nil {
+		stages, stageErr := purchase.NewService(s.DB).ProcessStages(ctx, []uint64{syb.ID})
+		var stage purchase.ProcessStageResult
+		if stageErr == nil {
+			stage = stages[syb.ID]
+		}
+		detail.SYB = &SYBDetailView{
+			SYBProductID: syb.ID, OrderCode: syb.OrderCode, ShopeeItemID: syb.ShopeeItemID,
+			ShopName: syb.ShopName, ProductTitle: syb.ProductTitle,
+			TargetColor: syb.TargetColor, TargetSize: syb.TargetSize, Quantity: syb.Quantity,
+			ImageURL: syb.ImageURL, CurrentStage: stage.Stage, CurrentStageLabel: stage.Label,
+		}
+		detail.NormalizedSYBSpec = trimCommas(Normalize(SYBSpecText(syb.TargetColor, syb.TargetSize)))
+	} else if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return detail, err
+	}
+
+	var item models.YeekeReturnItem
+	if err := s.DB.WithContext(ctx).First(&item, match.YeekeReturnItemID).Error; err == nil {
+		var pkg models.YeekeReturnPackage
+		if pkgErr := s.DB.WithContext(ctx).First(&pkg, item.PackageID).Error; pkgErr != nil && !errors.Is(pkgErr, gorm.ErrRecordNotFound) {
+			return detail, pkgErr
+		}
+		syncStatus, missingSince := item.SyncStatus, item.MissingSince
+		if pkg.SyncStatus != "" && pkg.SyncStatus != "ok" {
+			syncStatus, missingSince = pkg.SyncStatus, pkg.MissingSince
+		}
+		detail.Yeeke = &YeekeDetailView{
+			YeekeReturnItemID: item.ID, OrderSN: pkg.OrderSN, ItemID: item.ItemID, VariationID: item.VariationID,
+			ShopName: pkg.ShopName, ItemName: item.ItemName, VariationName: item.VariationName,
+			Quantity: item.Quantity, Image: item.Image, DestroyDeadline: pkg.DestroyDeadLine,
+			SyncStatus: syncStatus, MissingSince: missingSince,
+		}
+		detail.NormalizedYeekeSpec = trimCommas(Normalize(item.VariationName))
+	} else if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return detail, err
+	}
+
+	var logs []models.ReturnMatchLog
+	if err := s.DB.WithContext(ctx).Where("match_id = ?", matchID).Order("id DESC").Find(&logs).Error; err != nil {
+		return detail, err
+	}
+	detail.Logs = logs
+	return detail, nil
+}
+
+var errStateConflict = errors.New("return match state conflict")

server/app/goauto/returnmatch/service_test.go

@@ -0,0 +1,460 @@
+package returnmatch
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	"go-admin/app/goauto/migrations"
+	"go-admin/app/goauto/models"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func testDB(t *testing.T) *gorm.DB {
+	t.Helper()
+	dsn := fmt.Sprintf("file:%s?mode=memory&cache=shared&_foreign_keys=on", strings.ReplaceAll(t.Name(), "/", "_"))
+	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err = migrations.Migrate(db); err != nil {
+		t.Fatal(err)
+	}
+	return db
+}
+
+// shopeeLinkForItem memoizes one shopee_product row per (db, item id) test
+// case so multiple SYB rows for the same order/item share the link, same as
+// real data, while still landing on the PDD-unlinked stage (which
+// participates in matching per issue #338 rule 1) without needing the full
+// PDD/price fixture the purchase package's own tests use.
+func shopeeLinkForItem(t *testing.T, db *gorm.DB, itemID string) uint64 {
+	t.Helper()
+	var existing models.ShopeeProduct
+	if err := db.Where("shopee_item_id = ?", itemID).First(&existing).Error; err == nil {
+		return existing.ID
+	}
+	sp := models.ShopeeProduct{ShopeeItemID: itemID, Title: "蝦皮商品", ShopName: "测试店", SpecsJSON: `[]`, Currency: "CNY"}
+	if err := db.Create(&sp).Error; err != nil {
+		t.Fatal(err)
+	}
+	return sp.ID
+}
+
+func seedSYB(t *testing.T, db *gorm.DB, orderCode string, detailID uint64, color, size string, createdAt time.Time) models.SYBProduct {
+	t.Helper()
+	shopeeID := shopeeLinkForItem(t, db, "100")
+	syb := models.SYBProduct{
+		OrderCode: orderCode, DetailID: detailID, StockID: detailID, ShopeeItemID: "100", ShopeeProductID: &shopeeID,
+		TargetColor: color, TargetSize: size, Quantity: 1, UnitPriceCent: 1000,
+		ParseStatus: models.SYBParseStatusSuccess, RawJSON: `{}`,
+	}
+	if err := db.Create(&syb).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Model(&models.SYBProduct{}).Where("id = ?", syb.ID).Update("created_at", createdAt).Error; err != nil {
+		t.Fatal(err)
+	}
+	syb.CreatedAt = createdAt
+	return syb
+}
+
+func seedReturn(t *testing.T, db *gorm.DB, variationName string, deadline *time.Time) models.YeekeReturnItem {
+	t.Helper()
+	pkg := models.YeekeReturnPackage{
+		ExternalID: "pkg-" + variationName + fmt.Sprint(time.Now().UnixNano()), OrderSN: "ORD1", TrackingNo: "TRK1",
+		DestroyDeadLine: deadline, LastSyncedAt: time.Now(),
+	}
+	if err := db.Create(&pkg).Error; err != nil {
+		t.Fatal(err)
+	}
+	item := models.YeekeReturnItem{
+		PackageID: pkg.ID, ExternalKey: "key-" + variationName + fmt.Sprint(time.Now().UnixNano()),
+		ItemID: "100", VariationName: variationName, LastSyncedAt: time.Now(),
+	}
+	if err := db.Create(&item).Error; err != nil {
+		t.Fatal(err)
+	}
+	return item
+}
+
+func TestBatchMatch_EndToEnd(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "tester"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 1 || len(resp.Items) != 1 || !resp.Items[0].Matched {
+		t.Fatalf("expected one match: %+v", resp)
+	}
+
+	var match models.ReturnMatch
+	if err := db.First(&match, resp.Items[0].MatchID).Error; err != nil {
+		t.Fatal(err)
+	}
+	if match.Status != models.ReturnMatchStatusMatched || match.ActiveSYBProductID == nil || *match.ActiveSYBProductID != syb.ID {
+		t.Fatalf("unexpected match row: %+v", match)
+	}
+}
+
+func TestBatchMatch_ExpiredDeadlineNotMatched(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+
+	past := time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L", &past)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 0 || resp.SkippedCount != 1 {
+		t.Fatalf("expected skip due to expired deadline: %+v", resp)
+	}
+}
+
+func TestBatchMatch_MultiColourSameOrderCrossPairing(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+
+	white := seedSYB(t, db, "SYB-1", 1, "白色", "2XL", time.Date(2026, 9, 1, 12, 0, 0, 0, time.UTC))
+	purple := seedSYB(t, db, "SYB-1", 2, "紫色", "M", time.Date(2026, 9, 1, 11, 0, 0, 0, time.UTC))
+	whiteReturn := seedReturn(t, db, "白色,2XL【建議65-75公斤】", &deadline)
+	purpleReturn := seedReturn(t, db, "紫色,M【建議43-53公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{white.ID, purple.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 2 {
+		t.Fatalf("expected both to match: %+v", resp)
+	}
+	var matches []models.ReturnMatch
+	if err := db.Find(&matches).Error; err != nil {
+		t.Fatal(err)
+	}
+	got := map[uint64]uint64{}
+	for _, m := range matches {
+		got[m.SYBProductID] = m.YeekeReturnItemID
+	}
+	if got[white.ID] != whiteReturn.ID {
+		t.Fatalf("white SYB product should pair with white return, got %+v", got)
+	}
+	if got[purple.ID] != purpleReturn.ID {
+		t.Fatalf("purple SYB product should pair with purple return, got %+v", got)
+	}
+}
+
+func TestBatchMatch_ManualActionStageDoesNotParticipate(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+
+	// A parse-failed SYB product computes to 待人工处理, which the confirmed
+	// rule says must NOT participate even though a candidate return exists.
+	syb := models.SYBProduct{OrderCode: "SYB-1", DetailID: 1, StockID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", Quantity: 1, UnitPriceCent: 1000, ParseStatus: models.SYBParseStatusFailed, RawJSON: `{}`}
+	if err := db.Create(&syb).Error; err != nil {
+		t.Fatal(err)
+	}
+	seedReturn(t, db, "白色,L", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp.MatchedCount != 0 || resp.Items[0].ReasonCode != ReasonStageIneligible {
+		t.Fatalf("expected 待人工处理 to be excluded from matching: %+v", resp)
+	}
+}
+
+func TestConfirmThenCancel_RestoresAvailability(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil || resp.MatchedCount != 1 {
+		t.Fatalf("setup match failed: %v %+v", err, resp)
+	}
+	matchID := resp.Items[0].MatchID
+
+	if _, err := s.Confirm(context.Background(), matchID, "op1"); err != nil {
+		t.Fatal(err)
+	}
+	var confirmed models.ReturnMatch
+	db.First(&confirmed, matchID)
+	if confirmed.Status != models.ReturnMatchStatusConfirmed {
+		t.Fatalf("expected confirmed: %+v", confirmed)
+	}
+
+	if _, err := s.Cancel(context.Background(), matchID, "op2"); err != nil {
+		t.Fatal(err)
+	}
+	var cancelled models.ReturnMatch
+	db.First(&cancelled, matchID)
+	if cancelled.Status != models.ReturnMatchStatusCancelled || cancelled.ActiveSYBProductID != nil || cancelled.ActiveYeekeReturnItemID != nil {
+		t.Fatalf("expected cancel to clear active columns: %+v", cancelled)
+	}
+
+	// Rematch must be able to pick the same pair again (issue #338 rule 7).
+	resp2, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if resp2.MatchedCount != 1 {
+		t.Fatalf("expected rematch after cancel to succeed: %+v", resp2)
+	}
+}
+
+// TestBatchMatch_SkipsWhenStageRacesToTaskCreatedUnderLock is the #338
+// review fix-2 regression: a purchase task gets created for the SYB product
+// (moving its stage to task_created, which does not participate) AFTER
+// BatchMatch's outer screening pass already judged it eligible but BEFORE
+// matchOneWithLock's own re-check runs. The row must be skipped with
+// stage_ineligible, not matched.
+func TestMatchOneWithLock_SkipsWhenStageNoLongerParticipatesUnderLock(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	ret := seedReturn(t, db, "白色,L", &deadline)
+
+	// Simulate the exact race the review flagged: BatchMatch's outer
+	// screening pass already computed `outcome` while the product was still
+	// participating (pdd_unlinked). Before matchOneWithLock's own re-check
+	// runs (which takes the same row lock purchase.create takes and
+	// recomputes the stage inside that transaction), something else moves
+	// the product out of a participating stage — here simulated directly by
+	// flipping it to a parse-failed/manual_action state, same effect as a
+	// purchase task having been created for it in the meantime.
+	if err := db.Model(&models.SYBProduct{}).Where("id = ?", syb.ID).Update("parse_status", models.SYBParseStatusFailed).Error; err != nil {
+		t.Fatal(err)
+	}
+	outcome := MatchOutcome{SYBProductID: syb.ID, Matched: true, ReturnItemID: ret.ID, NormalizedKey: "100|白色,l"}
+
+	_, err := s.matchOneWithLock(context.Background(), syb.ID, outcome, "tester")
+	if !errors.Is(err, errStageNoLongerEligible) {
+		t.Fatalf("expected errStageNoLongerEligible, got %v", err)
+	}
+	var count int64
+	db.Model(&models.ReturnMatch{}).Where("syb_product_id = ?", syb.ID).Count(&count)
+	if count != 0 {
+		t.Fatalf("no return_match row should have been created when the stage race is caught: count=%d", count)
+	}
+}
+
+func TestBatchMatch_WritesLogRowInSameTransaction(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "tester"})
+	if err != nil || resp.MatchedCount != 1 {
+		t.Fatalf("setup match failed: %v %+v", err, resp)
+	}
+	var logs []models.ReturnMatchLog
+	if err := db.Where("match_id = ?", resp.Items[0].MatchID).Find(&logs).Error; err != nil {
+		t.Fatal(err)
+	}
+	if len(logs) != 1 || logs[0].Action != models.ReturnMatchLogActionMatched || logs[0].Operator != "tester" {
+		t.Fatalf("expected one matched log row: %+v", logs)
+	}
+}
+
+func TestConfirmCancelRemark_EachWritesOwnLogRow(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L", &deadline)
+	resp, _ := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "matcher"})
+	matchID := resp.Items[0].MatchID
+
+	if _, err := s.Remark(context.Background(), matchID, "reviewer", "看起来没问题"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.Confirm(context.Background(), matchID, "reviewer"); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := s.Cancel(context.Background(), matchID, "reviewer2"); err != nil {
+		t.Fatal(err)
+	}
+
+	var logs []models.ReturnMatchLog
+	if err := db.Where("match_id = ?", matchID).Order("id ASC").Find(&logs).Error; err != nil {
+		t.Fatal(err)
+	}
+	wantActions := []string{models.ReturnMatchLogActionMatched, models.ReturnMatchLogActionRemark, models.ReturnMatchLogActionConfirmed, models.ReturnMatchLogActionCancelled}
+	if len(logs) != len(wantActions) {
+		t.Fatalf("expected %d log rows, got %d: %+v", len(wantActions), len(logs), logs)
+	}
+	for i, action := range wantActions {
+		if logs[i].Action != action {
+			t.Fatalf("log[%d].Action = %q, want %q (%+v)", i, logs[i].Action, action, logs)
+		}
+	}
+	if logs[1].Detail != "看起来没问题" {
+		t.Fatalf("remark log must carry the remark text: %+v", logs[1])
+	}
+}
+
+func TestRemark_RejectsOverLongInputInsteadOfTruncating(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L", &deadline)
+	resp, _ := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}})
+	matchID := resp.Items[0].MatchID
+
+	tooLong := strings.Repeat("字", 501)
+	if _, err := s.Remark(context.Background(), matchID, "op", tooLong); !errors.Is(err, errRemarkTooLong) {
+		t.Fatalf("expected errRemarkTooLong, got %v", err)
+	}
+	var match models.ReturnMatch
+	db.First(&match, matchID)
+	if match.Remark != "" {
+		t.Fatalf("rejected remark must not be saved (partially or fully): %q", match.Remark)
+	}
+
+	exactly500 := strings.Repeat("字", 500)
+	if _, err := s.Remark(context.Background(), matchID, "op", exactly500); err != nil {
+		t.Fatalf("exactly 500 runes must be accepted: %v", err)
+	}
+}
+
+func TestDetail_ReturnsBothSidesNormalizedSpecsAndLogs(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	ret := seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}, Operator: "matcher"})
+	if err != nil || resp.MatchedCount != 1 {
+		t.Fatalf("setup failed: %v %+v", err, resp)
+	}
+	matchID := resp.Items[0].MatchID
+	if _, err := s.Remark(context.Background(), matchID, "op", "备注文字"); err != nil {
+		t.Fatal(err)
+	}
+
+	detail, err := s.Detail(context.Background(), matchID)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if detail.SYB == nil || detail.SYB.SYBProductID != syb.ID || detail.SYB.OrderCode != "SYB-1" {
+		t.Fatalf("missing/wrong SYB detail: %+v", detail.SYB)
+	}
+	if detail.Yeeke == nil || detail.Yeeke.YeekeReturnItemID != ret.ID || detail.Yeeke.OrderSN != "ORD1" {
+		t.Fatalf("missing/wrong yeeke detail: %+v", detail.Yeeke)
+	}
+	if detail.Yeeke.DestroyDeadline == nil || !detail.Yeeke.DestroyDeadline.Equal(deadline) {
+		t.Fatalf("expected destroy deadline to be carried through: %+v", detail.Yeeke)
+	}
+	if detail.NormalizedSYBSpec == "" || detail.NormalizedSYBSpec != detail.NormalizedYeekeSpec {
+		t.Fatalf("expected both sides to normalize equal: syb=%q yeeke=%q", detail.NormalizedSYBSpec, detail.NormalizedYeekeSpec)
+	}
+	if len(detail.Logs) != 2 {
+		t.Fatalf("expected 2 log rows (matched + remark), got %+v", detail.Logs)
+	}
+	if detail.Logs[0].Action != models.ReturnMatchLogActionRemark {
+		t.Fatalf("expected newest-first ordering (remark first): %+v", detail.Logs)
+	}
+	if detail.Match.YeekeSpecText == "" || detail.Match.PreviousProcessStage == "" {
+		t.Fatalf("insertMatch must fill YeekeSpecText and PreviousProcessStage: %+v", detail.Match)
+	}
+}
+
+// TestBatchMatch_ConcurrentInsertSkipsConflictRow exercises the DB unique
+// constraint directly: two goroutines racing to insert an active match for
+// the exact same SYB product must have exactly one winner, and the loser
+// must not error out the whole call (acceptance item 9).
+func TestBatchMatch_ConcurrentInsertSkipsConflictRow(t *testing.T) {
+	db := testDB(t)
+	sybID := uint64(1)
+	returnAID := uint64(101)
+	returnBID := uint64(102)
+
+	var wg sync.WaitGroup
+	results := make([]error, 2)
+	for i, retID := range []uint64{returnAID, returnBID} {
+		wg.Add(1)
+		go func(i int, retID uint64) {
+			defer wg.Done()
+			match := models.ReturnMatch{
+				SYBProductID: sybID, YeekeReturnItemID: retID,
+				ActiveSYBProductID: &sybID, ActiveYeekeReturnItemID: &retID,
+				Status: models.ReturnMatchStatusMatched, MatchedAt: time.Now(),
+			}
+			results[i] = db.Create(&match).Error
+		}(i, retID)
+	}
+	wg.Wait()
+
+	successCount := 0
+	conflictCount := 0
+	for _, err := range results {
+		if err == nil {
+			successCount++
+		} else if isUniqueConstraintErr(err) {
+			conflictCount++
+		} else {
+			t.Fatalf("unexpected error: %v", err)
+		}
+	}
+	if successCount != 1 || conflictCount != 1 {
+		t.Fatalf("expected exactly one winner and one unique-constraint conflict, got success=%d conflict=%d results=%v", successCount, conflictCount, results)
+	}
+}
+
+func TestList_EnrichesWithYeekeReturnDisplayFields(t *testing.T) {
+	db := testDB(t)
+	s := NewService(db)
+	s.Now = func() time.Time { return time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC) }
+	deadline := time.Date(2026, 10, 1, 0, 0, 0, 0, time.UTC)
+	syb := seedSYB(t, db, "SYB-1", 1, "白色", "L", time.Date(2026, 9, 1, 0, 0, 0, 0, time.UTC))
+	seedReturn(t, db, "白色,L【建議65-75公斤】", &deadline)
+
+	resp, err := s.BatchMatch(context.Background(), BatchMatchRequest{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil || resp.MatchedCount != 1 {
+		t.Fatalf("setup failed: %v %+v", err, resp)
+	}
+
+	items, err := s.List(context.Background(), ListFilter{SYBProductIDs: []uint64{syb.ID}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(items) != 1 || items[0].OrderSN != "ORD1" || items[0].DestroyDeadline == nil {
+		t.Fatalf("expected enriched list item: %+v", items)
+	}
+}

server/app/goauto/yeeke/handler.go

@@ -43,26 +43,29 @@ func (h Handler) db(c *gin.Context) (*gorm.DB, bool) {
 // only the summary fields already computed by the sync run itself; it never
 // carries yeeke_session (token/cookies) or a raw page response.
 type SyncRunDTO struct {
-	ID            uint64  `json:"id"`
-	Status        string  `json:"status"`
-	Trigger       string  `json:"trigger"`
-	TotalPages    int     `json:"totalPages"`
-	ReadCount     int     `json:"readCount"`
-	CreatedCount  int     `json:"createdCount"`
-	UpdatedCount  int     `json:"updatedCount"`
-	SkippedCount  int     `json:"skippedCount"`
-	FailedCount   int     `json:"failedCount"`
-	ErrorMessage  string  `json:"errorMessage"`
-	StartedAt     string  `json:"startedAt"`
-	FinishedAt    *string `json:"finishedAt"`
-	LastSuccessAt *string `json:"lastSuccessAt"`
+	ID                 uint64  `json:"id"`
+	Status             string  `json:"status"`
+	Trigger            string  `json:"trigger"`
+	TotalPages         int     `json:"totalPages"`
+	ReadCount          int     `json:"readCount"`
+	CreatedCount       int     `json:"createdCount"`
+	UpdatedCount       int     `json:"updatedCount"`
+	SkippedCount       int     `json:"skippedCount"`
+	FailedCount        int     `json:"failedCount"`
+	MissingMarkedCount int     `json:"missingMarkedCount"`
+	RecoveredCount     int     `json:"recoveredCount"`
+	ErrorMessage       string  `json:"errorMessage"`
+	StartedAt          string  `json:"startedAt"`
+	FinishedAt         *string `json:"finishedAt"`
+	LastSuccessAt      *string `json:"lastSuccessAt"`
 }
 
 func toDTO(r models.YeekeSyncRun) SyncRunDTO {
 	dto := SyncRunDTO{
 		ID: r.ID, Status: r.Status, Trigger: r.Trigger, TotalPages: r.TotalPages,
 		ReadCount: r.ReadCount, CreatedCount: r.CreatedCount, UpdatedCount: r.UpdatedCount,
-		SkippedCount: r.SkippedCount, FailedCount: r.FailedCount, ErrorMessage: r.ErrorMessage,
+		SkippedCount: r.SkippedCount, FailedCount: r.FailedCount,
+		MissingMarkedCount: r.MissingMarkedCount, RecoveredCount: r.RecoveredCount, ErrorMessage: r.ErrorMessage,
 		StartedAt: r.StartedAt.UTC().Format("2006-01-02T15:04:05Z"),
 	}
 	if r.FinishedAt != nil {

server/app/goauto/yeeke/list.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/purchase"
 
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
@@ -19,13 +20,15 @@ import (
 // image field is always the external yeeke URL (never downloaded/proxied,
 // per #337 non-goal).
 type ReturnItemDTO struct {
-	ID            uint64 `json:"id"`
-	ItemID        string `json:"itemId"`
-	VariationID   string `json:"variationId"`
-	ItemName      string `json:"itemName"`
-	VariationName string `json:"variationName"`
-	Image         string `json:"image"`
-	Quantity      int64  `json:"quantity"`
+	ID            uint64  `json:"id"`
+	ItemID        string  `json:"itemId"`
+	VariationID   string  `json:"variationId"`
+	ItemName      string  `json:"itemName"`
+	VariationName string  `json:"variationName"`
+	Image         string  `json:"image"`
+	Quantity      int64   `json:"quantity"`
+	SyncStatus    string  `json:"syncStatus"`
+	MissingSince  *string `json:"missingSince,omitempty"`
 }
 
 // ReturnPackageDTO is the read-only shape of one return package returned to
@@ -49,6 +52,7 @@ type ReturnPackageDTO struct {
 	DestroyDeadLine    *string         `json:"destroyDeadLine"`
 	LastSyncedAt       string          `json:"lastSyncedAt"`
 	SyncStatus         string          `json:"syncStatus"`
+	MissingSince       *string         `json:"missingSince,omitempty"`
 	Items              []ReturnItemDTO `json:"items,omitempty"`
 }
 
@@ -76,8 +80,29 @@ type ReturnItemRowDTO struct {
 	DestroyDeadLine    *string `json:"destroyDeadLine"`
 	LastSyncedAt       string  `json:"lastSyncedAt"`
 	HasItem            bool    `json:"hasItem"`
+
+	// SyncStatus/MissingSince (#338 scope addition): "missing" when this
+	// item, or its package, has fallen out of a COMPLETE yeeke sync — the
+	// row is never dropped from this list, only flagged unavailable.
+	SyncStatus   string  `json:"syncStatus,omitempty"`
+	MissingSince *string `json:"missingSince,omitempty"`
+
+	// #338: match status/占用信息, joined from return_match (active match
+	// only). MatchStatus is "unmatched" when there is no active match.
+	MatchID                uint64 `json:"matchId,omitempty"`
+	MatchStatus            string `json:"matchStatus"`
+	OccupyingSYBProductID  uint64 `json:"occupyingSybProductId,omitempty"`
+	OccupyingSYBOrderCode  string `json:"occupyingSybOrderCode,omitempty"`
+	OccupyingSYBStage      string `json:"occupyingSybStage,omitempty"`
+	OccupyingSYBStageLabel string `json:"occupyingSybStageLabel,omitempty"`
 }
 
+const (
+	ReturnMatchFilterUnmatched = "unmatched"
+	ReturnMatchFilterMatched   = "matched"
+	ReturnMatchFilterConfirmed = "confirmed"
+)
+
 func formatTimePtr(t *time.Time) *string {
 	if t == nil {
 		return nil
@@ -94,6 +119,7 @@ func toPackageDTO(p models.YeekeReturnPackage, itemCount int) ReturnPackageDTO {
 		ClaimTime: formatTimePtr(p.ClaimTime), CreateTime: formatTimePtr(p.CreateTime),
 		UpdateTime: formatTimePtr(p.UpdateTime), DestroyDeadLine: formatTimePtr(p.DestroyDeadLine),
 		LastSyncedAt: p.LastSyncedAt.UTC().Format("2006-01-02T15:04:05Z"), SyncStatus: p.SyncStatus,
+		MissingSince: formatTimePtr(p.MissingSince),
 	}
 }
 
@@ -101,6 +127,7 @@ func toItemDTO(i models.YeekeReturnItem) ReturnItemDTO {
 	return ReturnItemDTO{
 		ID: i.ID, ItemID: i.ItemID, VariationID: i.VariationID, ItemName: i.ItemName,
 		VariationName: i.VariationName, Image: i.Image, Quantity: i.Quantity,
+		SyncStatus: i.SyncStatus, MissingSince: formatTimePtr(i.MissingSince),
 	}
 }
 
@@ -126,6 +153,20 @@ type itemRow struct {
 	ItemImage         *string
 	ItemQuantity      *int64
 	ItemLastSynced    *time.Time
+
+	// #338 scope addition: item's own and its package's sync_status/
+	// missing_since, so the row can be flagged unavailable regardless of
+	// which side dropped out of a COMPLETE yeeke sync.
+	ItemSyncStatus      *string    `gorm:"column:item_sync_status"`
+	ItemMissingSince    *time.Time `gorm:"column:item_missing_since"`
+	PackageSyncStatus   string     `gorm:"column:package_sync_status"`
+	PackageMissingSince *time.Time `gorm:"column:package_missing_since"`
+
+	// #338 match columns, from the LEFT JOIN onto return_match/syb_product.
+	MatchID               *uint64 `gorm:"column:match_id"`
+	MatchStatus           *string `gorm:"column:match_status"`
+	OccupyingSYBProductID *uint64 `gorm:"column:occupying_syb_product_id"`
+	OccupyingSYBOrderCode *string `gorm:"column:occupying_syb_order_code"`
 }
 
 func toItemRowDTO(r itemRow) ReturnItemRowDTO {
@@ -166,6 +207,35 @@ func toItemRowDTO(r itemRow) ReturnItemRowDTO {
 	if r.ItemLastSynced != nil {
 		dto.LastSyncedAt = r.ItemLastSynced.UTC().Format("2006-01-02T15:04:05Z")
 	}
+	// #338: the package being "missing" makes the item unavailable too,
+	// even if the item row itself is still "ok" — its reason/timestamp wins.
+	syncStatus, missingSince := "ok", r.ItemMissingSince
+	if r.ItemSyncStatus != nil {
+		syncStatus = *r.ItemSyncStatus
+	}
+	if r.PackageSyncStatus != "" && r.PackageSyncStatus != "ok" {
+		syncStatus, missingSince = r.PackageSyncStatus, r.PackageMissingSince
+	}
+	dto.SyncStatus = syncStatus
+	dto.MissingSince = formatTimePtr(missingSince)
+	dto.MatchStatus = ReturnMatchFilterUnmatched
+	if r.MatchID != nil {
+		dto.MatchID = *r.MatchID
+		if r.MatchStatus != nil {
+			switch *r.MatchStatus {
+			case models.ReturnMatchStatusConfirmed:
+				dto.MatchStatus = ReturnMatchFilterConfirmed
+			default:
+				dto.MatchStatus = ReturnMatchFilterMatched
+			}
+		}
+		if r.OccupyingSYBProductID != nil {
+			dto.OccupyingSYBProductID = *r.OccupyingSYBProductID
+		}
+		if r.OccupyingSYBOrderCode != nil {
+			dto.OccupyingSYBOrderCode = *r.OccupyingSYBOrderCode
+		}
+	}
 	return dto
 }
 
@@ -190,7 +260,12 @@ func (h Handler) ListReturnPackages(c *gin.Context) {
 	}
 
 	base := db.Table("yeeke_return_package p").
-		Joins("LEFT JOIN yeeke_return_item i ON i.package_id = p.id")
+		Joins("LEFT JOIN yeeke_return_item i ON i.package_id = p.id").
+		// #338: single bounded LEFT JOIN onto the active match (if any) and
+		// the SYB product it occupies, so 匹配状态 filtering/column never
+		// needs a per-row lookup.
+		Joins("LEFT JOIN return_match m ON m.active_yeeke_return_item_id = i.id").
+		Joins("LEFT JOIN syb_product sp ON sp.id = m.syb_product_id")
 	if v := strings.TrimSpace(c.Query("orderSn")); v != "" {
 		base = base.Where("p.order_sn LIKE ?", "%"+v+"%")
 	}
@@ -235,6 +310,19 @@ func (h Handler) ListReturnPackages(c *gin.Context) {
 	if v := strings.TrimSpace(c.Query("variationId")); v != "" {
 		base = base.Where("i.variation_id = ?", v)
 	}
+	switch matchStatus := strings.TrimSpace(c.Query("matchStatus")); matchStatus {
+	case "":
+		// no filter
+	case ReturnMatchFilterUnmatched:
+		base = base.Where("m.id IS NULL")
+	case ReturnMatchFilterMatched:
+		base = base.Where("m.status = ?", models.ReturnMatchStatusMatched)
+	case ReturnMatchFilterConfirmed:
+		base = base.Where("m.status = ?", models.ReturnMatchStatusConfirmed)
+	default:
+		c.JSON(http.StatusBadRequest, gin.H{"code": "INVALID_REQUEST", "message": "matchStatus 无效"})
+		return
+	}
 
 	var total int64
 	if err := base.Session(&gorm.Session{}).Count(&total).Error; err != nil {
@@ -247,7 +335,10 @@ func (h Handler) ListReturnPackages(c *gin.Context) {
 		"p.id as package_id, p.order_sn, p.shop_name, p.ware_house, p.ware_code, p.claim_status, " +
 			"p.status_unrecognized, p.claim_time, p.destroy_dead_line as destroy_dead_line, p.last_synced_at as package_last_synced, " +
 			"i.id as item_id, i.item_id as item_external_item, i.variation_id as item_variation_id, i.item_name as item_name, " +
-			"i.variation_name as item_variation_name, i.image as item_image, i.quantity as item_quantity, i.last_synced_at as item_last_synced",
+			"i.variation_name as item_variation_name, i.image as item_image, i.quantity as item_quantity, i.last_synced_at as item_last_synced, " +
+			"i.sync_status as item_sync_status, i.missing_since as item_missing_since, " +
+			"p.sync_status as package_sync_status, p.missing_since as package_missing_since, " +
+			"m.id as match_id, m.status as match_status, sp.id as occupying_syb_product_id, sp.order_code as occupying_syb_order_code",
 	).Order("p.create_time desc, i.id asc").
 		Offset((page - 1) * pageSize).Limit(pageSize)
 	if err := q.Find(&rows).Error; err != nil {
@@ -255,9 +346,37 @@ func (h Handler) ListReturnPackages(c *gin.Context) {
 		return
 	}
 
+	// #338: one bounded ProcessStages call for the distinct occupying SYB
+	// product ids on this page (never per-row), so the 「被占用 SYB 订单
+	// 商品」 column can also show its current stage.
+	sybIDs := make([]uint64, 0, len(rows))
+	seenSYB := make(map[uint64]bool, len(rows))
+	for _, r := range rows {
+		if r.OccupyingSYBProductID != nil && !seenSYB[*r.OccupyingSYBProductID] {
+			seenSYB[*r.OccupyingSYBProductID] = true
+			sybIDs = append(sybIDs, *r.OccupyingSYBProductID)
+		}
+	}
+	var stages map[uint64]purchase.ProcessStageResult
+	if len(sybIDs) > 0 {
+		var stageErr error
+		stages, stageErr = purchase.NewService(db).ProcessStages(c.Request.Context(), sybIDs)
+		if stageErr != nil {
+			c.JSON(http.StatusInternalServerError, gin.H{"code": "INTERNAL", "message": "服务端处理失败"})
+			return
+		}
+	}
+
 	items := make([]ReturnItemRowDTO, 0, len(rows))
 	for _, r := range rows {
-		items = append(items, toItemRowDTO(r))
+		dto := toItemRowDTO(r)
+		if r.OccupyingSYBProductID != nil {
+			if stage, ok := stages[*r.OccupyingSYBProductID]; ok {
+				dto.OccupyingSYBStage = stage.Stage
+				dto.OccupyingSYBStageLabel = stage.Label
+			}
+		}
+		items = append(items, dto)
 	}
 
 	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{

server/app/goauto/yeeke/list_match_test.go

@@ -0,0 +1,113 @@
+package yeeke
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strconv"
+	"testing"
+	"time"
+
+	"go-admin/app/goauto/models"
+
+	"github.com/gin-gonic/gin"
+)
+
+// TestListReturnItems_MatchStatusFilterAndOccupyingColumn is the #338 web-UI
+// support test: the yeeke returns list must be able to filter by match
+// status and show which SYB order product occupies a matched return, using
+// the single bounded LEFT JOIN added to ListReturnPackages (no N+1).
+func TestListReturnItems_MatchStatusFilterAndOccupyingColumn(t *testing.T) {
+	gin.SetMode(gin.TestMode)
+	db := testDB(t)
+	now := time.Date(2026, 9, 24, 0, 0, 0, 0, time.UTC)
+	deadline := now.Add(30 * 24 * time.Hour)
+
+	pkg := models.YeekeReturnPackage{ExternalID: "pkg-m1", OrderSN: "ORD-M1", TrackingNo: "T1", DestroyDeadLine: &deadline, LastSyncedAt: now, CreateTime: &now}
+	if err := db.Create(&pkg).Error; err != nil {
+		t.Fatal(err)
+	}
+	matchedItem := models.YeekeReturnItem{PackageID: pkg.ID, ExternalKey: "k-matched", ItemID: "100", VariationName: "白色,L", LastSyncedAt: now}
+	unmatchedItem := models.YeekeReturnItem{PackageID: pkg.ID, ExternalKey: "k-unmatched", ItemID: "100", VariationName: "黑色,M", LastSyncedAt: now}
+	if err := db.Create(&matchedItem).Error; err != nil {
+		t.Fatal(err)
+	}
+	if err := db.Create(&unmatchedItem).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	syb := models.SYBProduct{OrderCode: "SYB-OCC-1", DetailID: 1, StockID: 1, ShopeeItemID: "100", TargetColor: "白色", TargetSize: "L", Quantity: 1, UnitPriceCent: 100, ParseStatus: models.SYBParseStatusSuccess, RawJSON: "{}"}
+	if err := db.Create(&syb).Error; err != nil {
+		t.Fatal(err)
+	}
+	match := models.ReturnMatch{
+		SYBProductID: syb.ID, YeekeReturnItemID: matchedItem.ID,
+		ActiveSYBProductID: &syb.ID, ActiveYeekeReturnItemID: &matchedItem.ID,
+		Status: models.ReturnMatchStatusMatched, MatchedAt: now,
+	}
+	if err := db.Create(&match).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	handler := Handler{DB: db}
+	engine := gin.New()
+	engine.GET("/api/admin/v1/yeeke-returns", handler.ListReturnPackages)
+	do := func(req *http.Request) *httptest.ResponseRecorder {
+		w := httptest.NewRecorder()
+		engine.ServeHTTP(w, req)
+		return w
+	}
+
+	// No filter: both rows present, matched row carries occupying info.
+	w := do(httptest.NewRequest(http.MethodGet, "/api/admin/v1/yeeke-returns", nil))
+	var resp itemRowListResp
+	decodeJSON(t, w.Body.Bytes(), &resp)
+	if resp.Data.Total != 2 {
+		t.Fatalf("expected 2 rows, got %+v", resp.Data)
+	}
+	byKey := map[string]ReturnItemRowDTO{}
+	for _, item := range resp.Data.Items {
+		byKey[item.Key] = item
+	}
+	matchedDTO := byKey[strconv.FormatUint(matchedItem.ID, 10)]
+	if matchedDTO.MatchStatus != ReturnMatchFilterMatched {
+		t.Fatalf("expected matched status: %+v", matchedDTO)
+	}
+	if matchedDTO.OccupyingSYBOrderCode != "SYB-OCC-1" || matchedDTO.OccupyingSYBProductID != syb.ID {
+		t.Fatalf("expected occupying SYB info: %+v", matchedDTO)
+	}
+	if matchedDTO.OccupyingSYBStageLabel == "" {
+		t.Fatalf("expected occupying SYB stage label to be filled: %+v", matchedDTO)
+	}
+	unmatchedDTO := byKey[strconv.FormatUint(unmatchedItem.ID, 10)]
+	if unmatchedDTO.MatchStatus != ReturnMatchFilterUnmatched || unmatchedDTO.OccupyingSYBProductID != 0 {
+		t.Fatalf("expected unmatched status with no occupying info: %+v", unmatchedDTO)
+	}
+
+	// matchStatus=unmatched filters down to just the unmatched row.
+	w = do(httptest.NewRequest(http.MethodGet, "/api/admin/v1/yeeke-returns?matchStatus=unmatched", nil))
+	decodeJSON(t, w.Body.Bytes(), &resp)
+	if resp.Data.Total != 1 || len(resp.Data.Items) != 1 || resp.Data.Items[0].Key != strconv.FormatUint(unmatchedItem.ID, 10) {
+		t.Fatalf("expected only the unmatched row: %+v", resp.Data)
+	}
+
+	// matchStatus=matched filters down to just the matched row.
+	w = do(httptest.NewRequest(http.MethodGet, "/api/admin/v1/yeeke-returns?matchStatus=matched", nil))
+	decodeJSON(t, w.Body.Bytes(), &resp)
+	if resp.Data.Total != 1 || len(resp.Data.Items) != 1 || resp.Data.Items[0].Key != strconv.FormatUint(matchedItem.ID, 10) {
+		t.Fatalf("expected only the matched row: %+v", resp.Data)
+	}
+
+	// Invalid value is rejected, not silently ignored.
+	w = do(httptest.NewRequest(http.MethodGet, "/api/admin/v1/yeeke-returns?matchStatus=bogus", nil))
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400 for invalid matchStatus, got %d", w.Code)
+	}
+}
+
+func decodeJSON(t *testing.T, body []byte, v any) {
+	t.Helper()
+	if err := json.Unmarshal(body, v); err != nil {
+		t.Fatalf("decode response: %v (%s)", err, body)
+	}
+}

server/app/goauto/yeeke/sync.go

@@ -40,6 +40,17 @@ type Report struct {
 	RunID                                               uint64
 	TotalPages, Read, Created, Updated, Skipped, Failed int
 	Status                                              string
+	// MissingMarked is the number of yeeke_return_item rows flipped from
+	// "ok" to "missing" by this run's completion (#338). It is only ever
+	// non-zero on a run whose page walk finished naturally, wrote no
+	// failures, and stayed under the 20% safety-valve threshold. Persisted
+	// as yeeke_sync_run.missing_marked_count; when the safety valve skips
+	// marking it stays 0 and the reason goes to error_message.
+	MissingMarked int
+	// Recovered is the number of yeeke_return_item rows that were "missing"
+	// before this run and reappeared in it, flipping back to "ok" (#338).
+	// Persisted as yeeke_sync_run.recovered_count.
+	Recovered int
 }
 
 // knownClaimStatuses lists the status values the sync code currently
@@ -177,7 +188,7 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 	var runErr error
 	defer func() {
 		now := time.Now().UTC()
-		updates := map[string]any{"status": rep.Status, "total_pages": rep.TotalPages, "read_count": rep.Read, "created_count": rep.Created, "updated_count": rep.Updated, "skipped_count": rep.Skipped, "failed_count": rep.Failed, "error_message": errMsg, "active_slot": nil, "lease_owner": "", "lease_expires_at": nil, "finished_at": now}
+		updates := map[string]any{"status": rep.Status, "total_pages": rep.TotalPages, "read_count": rep.Read, "created_count": rep.Created, "updated_count": rep.Updated, "skipped_count": rep.Skipped, "failed_count": rep.Failed, "missing_marked_count": rep.MissingMarked, "recovered_count": rep.Recovered, "error_message": errMsg, "active_slot": nil, "lease_owner": "", "lease_expires_at": nil, "finished_at": now}
 		if rep.Status == "succeeded" {
 			updates["last_success_at"] = now
 		}
@@ -185,6 +196,13 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 	}()
 	seen := map[string]bool{}
 	var firstWriteErr error
+	// complete tracks whether the page walk ended NATURALLY (empty page,
+	// short page, or reaching p.Pages) as opposed to the duplicate-
+	// fingerprint break or MaxPages exhaustion (#338): only a naturally
+	// complete run is trusted to mark absent items/packages "missing" below,
+	// since a duplicate/MaxPages stop means the walk never actually finished
+	// seeing everything yeeke currently has.
+	complete := false
 	for page := 1; page <= s.cfg.MaxPages; page++ {
 		var p yeekeclient.ReturnPage
 		var e error
@@ -211,6 +229,7 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 		}
 		rep.TotalPages = page
 		if len(p.Records) == 0 {
+			complete = true
 			break
 		}
 		finger := pageFingerprint(p)
@@ -220,7 +239,7 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 		}
 		seen[finger] = true
 		for _, x := range p.Records {
-			created, updated, err := s.upsert(ctx, x)
+			created, updated, recovered, err := s.upsert(ctx, x)
 			if err != nil {
 				rep.Failed++
 				if firstWriteErr == nil {
@@ -229,6 +248,7 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 				continue
 			}
 			rep.Read++
+			rep.Recovered += recovered
 			if created {
 				rep.Created++
 			} else if updated {
@@ -238,9 +258,11 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 			}
 		}
 		if len(p.Records) < s.cfg.PageSize {
+			complete = true
 			break
 		}
 		if p.Pages > 0 && page >= p.Pages {
+			complete = true
 			break
 		}
 	}
@@ -253,9 +275,73 @@ func (s *Service) run(ctx context.Context, r *models.YeekeSyncRun) (Report, erro
 			runErr = errors.New(errMsg)
 		}
 	}
+	// #338: only a naturally complete run with zero write failures is
+	// trusted to mark items/packages the sync no longer sees as "missing".
+	if complete && rep.Failed == 0 && rep.Status == "succeeded" {
+		marked, valveReason, mErr := s.markMissing(ctx, r)
+		switch {
+		case mErr != nil:
+			errMsg = truncateRunError(fmt.Sprintf("标记 yeeke 退货不可用失败：%v", mErr))
+		case valveReason != "":
+			errMsg = truncateRunError(valveReason)
+		default:
+			rep.MissingMarked = marked
+		}
+	}
 	return rep, nil
 }
 
+// markMissing implements #338's completion-triggered availability flip: any
+// yeeke_return_item/yeeke_return_package row still marked sync_status="ok"
+// but whose last_synced_at predates this run's start was not touched by
+// this (complete, failure-free) run's upsert calls, meaning yeeke no longer
+// reports it. Both tables are flipped to "missing" with missing_since
+// stamped, in one transaction, so a reader never observes the item flipped
+// without its package (or vice versa). Rows are never deleted.
+//
+// Safety valve: if the number of items that would be marked exceeds 20% of
+// the items currently "ok", nothing is marked and valveReason explains why
+// (the run itself still finishes as "succeeded" — this is a caution, not a
+// sync failure).
+func (s *Service) markMissing(ctx context.Context, r *models.YeekeSyncRun) (marked int, valveReason string, err error) {
+	var totalOkItems int64
+	if e := s.db.WithContext(ctx).Model(&models.YeekeReturnItem{}).Where("sync_status = ?", "ok").Count(&totalOkItems).Error; e != nil {
+		return 0, "", e
+	}
+	var candidateItems int64
+	if e := s.db.WithContext(ctx).Model(&models.YeekeReturnItem{}).
+		Where("sync_status = ? AND last_synced_at < ?", "ok", r.StartedAt).
+		Count(&candidateItems).Error; e != nil {
+		return 0, "", e
+	}
+	if candidateItems == 0 {
+		return 0, "", nil
+	}
+	// candidateItems/totalOkItems > 20%  <=>  candidateItems*5 > totalOkItems
+	// (integer-only, avoids float rounding).
+	if totalOkItems > 0 && candidateItems*5 > totalOkItems {
+		return 0, fmt.Sprintf(
+			"未标记 yeeke 退货不可用：待标记 %d 条超过当前可用退货商品 %d 条的 20%% 安全阈值，需人工核查后再处理",
+			candidateItems, totalOkItems,
+		), nil
+	}
+	now := time.Now().UTC()
+	txErr := s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if e := tx.Model(&models.YeekeReturnItem{}).
+			Where("sync_status = ? AND last_synced_at < ?", "ok", r.StartedAt).
+			Updates(map[string]any{"sync_status": "missing", "missing_since": now}).Error; e != nil {
+			return e
+		}
+		return tx.Model(&models.YeekeReturnPackage{}).
+			Where("sync_status = ? AND last_synced_at < ?", "ok", r.StartedAt).
+			Updates(map[string]any{"sync_status": "missing", "missing_since": now}).Error
+	})
+	if txErr != nil {
+		return 0, "", txErr
+	}
+	return int(candidateItems), "", nil
+}
+
 // truncateRunError keeps error_message inside the column's size limit. It
 // never includes request bodies or headers, so it cannot leak a captcha,
 // token or credential: every error path above passes only Go error text from
@@ -273,7 +359,10 @@ func pageFingerprint(p yeekeclient.ReturnPage) string {
 	h := sha256.Sum256(b)
 	return hex.EncodeToString(h[:])
 }
-func (s *Service) upsert(ctx context.Context, p yeekeclient.ReturnPackage) (bool, bool, error) {
+
+// upsert writes one package and its items. recovered counts items that were
+// marked "missing" before and reappeared in this run (#338).
+func (s *Service) upsert(ctx context.Context, p yeekeclient.ReturnPackage) (created bool, updated bool, recovered int, err error) {
 	now := time.Now().UTC()
 	key := packageKey(p)
 	status := external(p.Status)
@@ -282,7 +371,7 @@ func (s *Service) upsert(ctx context.Context, p yeekeclient.ReturnPackage) (bool
 	// behind without its items. Rows are always inserted fully populated —
 	// MySQL strict mode (NO_ZERO_DATE) rejects the zero last_synced_at an
 	// empty placeholder insert would carry, which failed every record.
-	err := s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+	err = s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
 		var row models.YeekeReturnPackage
 		e := tx.Where("external_id = ?", key).First(&row).Error
 		isNew = errors.Is(e, gorm.ErrRecordNotFound)
@@ -304,7 +393,10 @@ func (s *Service) upsert(ctx context.Context, p yeekeclient.ReturnPackage) (bool
 				return e
 			}
 		} else {
-			vals := map[string]any{"order_sn": fields.OrderSN, "tracking_no": fields.TrackingNo, "shop_id": fields.ShopID, "shop_name": fields.ShopName, "ware_code": fields.WareCode, "ware_house": fields.WareHouse, "ware_name": fields.WareName, "claim_status": fields.ClaimStatus, "status_unrecognized": fields.StatusUnrecognized, "claim_time": fields.ClaimTime, "create_time": fields.CreateTime, "update_time": fields.UpdateTime, "destroy_dead_line": fields.DestroyDeadLine, "last_synced_at": now, "sync_status": "ok"}
+			// #338: missing_since is reset to NULL whenever a package
+			// reappears in a sync so it recovers cleanly, whatever its prior
+			// sync_status was.
+			vals := map[string]any{"order_sn": fields.OrderSN, "tracking_no": fields.TrackingNo, "shop_id": fields.ShopID, "shop_name": fields.ShopName, "ware_code": fields.WareCode, "ware_house": fields.WareHouse, "ware_name": fields.WareName, "claim_status": fields.ClaimStatus, "status_unrecognized": fields.StatusUnrecognized, "claim_time": fields.ClaimTime, "create_time": fields.CreateTime, "update_time": fields.UpdateTime, "destroy_dead_line": fields.DestroyDeadLine, "last_synced_at": now, "sync_status": "ok", "missing_since": (*time.Time)(nil)}
 			if e = tx.Model(&row).Updates(vals).Error; e != nil {
 				return e
 			}
@@ -327,7 +419,10 @@ func (s *Service) upsert(ctx context.Context, p yeekeclient.ReturnPackage) (bool
 			case ie != nil:
 				return ie
 			default:
-				iv := map[string]any{"item_id": item.ItemID, "variation_id": item.VariationID, "item_name": item.ItemName, "variation_name": item.VariationName, "image": item.Image, "quantity": item.Quantity, "last_synced_at": now, "sync_status": "ok"}
+				if existing.SyncStatus == "missing" {
+					recovered++
+				}
+				iv := map[string]any{"item_id": item.ItemID, "variation_id": item.VariationID, "item_name": item.ItemName, "variation_name": item.VariationName, "image": item.Image, "quantity": item.Quantity, "last_synced_at": now, "sync_status": "ok", "missing_since": (*time.Time)(nil)}
 				if e = tx.Model(&existing).Updates(iv).Error; e != nil {
 					return e
 				}
@@ -336,7 +431,7 @@ func (s *Service) upsert(ctx context.Context, p yeekeclient.ReturnPackage) (bool
 		return nil
 	})
 	if err != nil {
-		return false, false, err
+		return false, false, 0, err
 	}
-	return isNew, !isNew, nil
+	return isNew, !isNew, recovered, nil
 }

server/app/goauto/yeeke/sync_missing_test.go

@@ -0,0 +1,406 @@
+package yeeke
+
+import (
+	"context"
+	"fmt"
+	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/yeekeclient"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+// fivePackagesFirstReport builds a first-sync page of 5 distinct packages
+// (p1..p5), so a follow-up run dropping exactly one of them (1/5 = 20%,
+// the safety-valve boundary, which is not ">20%") still marks it missing.
+func fivePackagesFirstReport() []string {
+	recs := make([]string, 0, 5)
+	for i := 1; i <= 5; i++ {
+		id := fmt.Sprintf("p%d", i)
+		recs = append(recs, record(id, "i", "v"+id, 1))
+	}
+	return recs
+}
+
+// TestCompleteRunMarksAbsentItemsAndPackagesMissing: p1 exists from an
+// earlier sync of 5 packages; a later, naturally complete run only reports
+// the other 4 (p2..p5). p1's item and package must both flip to
+// sync_status="missing" with missing_since set; p2..p5 must stay "ok".
+func TestCompleteRunMarksAbsentItemsAndPackagesMissing(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 10})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page(fivePackagesFirstReport(), 5, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("first sync: %v", err)
+	}
+	srv1.Close()
+
+	time.Sleep(1100 * time.Millisecond) // ensure StartedAt of run 2 is strictly later
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p2", "i", "vp2", 1), record("p3", "i", "vp3", 1), record("p4", "i", "vp4", 1), record("p5", "i", "vp5", 1)}, 4, 1))
+	}))
+	defer srv2.Close()
+	s.client, _ = yeekeclient.New(srv2.URL)
+	rep, err := s.Sync(context.Background(), "manual")
+	if err != nil {
+		t.Fatalf("second sync: %v", err)
+	}
+	if rep.Status != "succeeded" {
+		t.Fatalf("rep=%+v", rep)
+	}
+	if rep.MissingMarked != 1 {
+		t.Fatalf("MissingMarked=%d, want 1", rep.MissingMarked)
+	}
+
+	var p1 models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p1").First(&p1).Error; e != nil {
+		t.Fatal(e)
+	}
+	if p1.SyncStatus != "missing" || p1.MissingSince == nil {
+		t.Fatalf("p1 package=%+v, want sync_status=missing with missing_since set", p1)
+	}
+	var i1 models.YeekeReturnItem
+	if e := db.Where("package_id = ?", p1.ID).First(&i1).Error; e != nil {
+		t.Fatal(e)
+	}
+	if i1.SyncStatus != "missing" || i1.MissingSince == nil {
+		t.Fatalf("p1 item=%+v, want sync_status=missing with missing_since set", i1)
+	}
+
+	var p2 models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p2").First(&p2).Error; e != nil {
+		t.Fatal(e)
+	}
+	if p2.SyncStatus != "ok" || p2.MissingSince != nil {
+		t.Fatalf("p2 package=%+v, want sync_status=ok with no missing_since", p2)
+	}
+}
+
+// TestFailedPageStopsMarking: page 2 always fails, so the run ends "failed".
+// Nothing must be marked missing even though p1 (from an earlier run) is
+// absent from this run's (incomplete) output.
+func TestFailedPageStopsMarking(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 1, Retry: 0})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p1", "i", "v1", 1)}, 1, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("first sync: %v", err)
+	}
+	srv1.Close()
+
+	var calls int32
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		n := atomic.AddInt32(&calls, 1)
+		if n == 1 {
+			w.Header().Set("Content-Type", "application/json")
+			fmt.Fprint(w, page([]string{record("p2", "i", "v2", 1)}, 2, 2))
+			return
+		}
+		http.Error(w, "boom", http.StatusInternalServerError)
+	}))
+	defer srv2.Close()
+	s.client, _ = yeekeclient.New(srv2.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err == nil {
+		t.Fatal("expected the second run (failed page 2) to error")
+	}
+
+	var p1 models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p1").First(&p1).Error; e != nil {
+		t.Fatal(e)
+	}
+	if p1.SyncStatus != "ok" || p1.MissingSince != nil {
+		t.Fatalf("p1 must stay ok after a failed page, got %+v", p1)
+	}
+}
+
+// TestCtxCancelStopsMarking: the context is cancelled mid-walk. The run ends
+// with an error and must not mark anything missing.
+func TestCtxCancelStopsMarking(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 1, Retry: 0})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p1", "i", "v1", 1)}, 1, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("first sync: %v", err)
+	}
+	srv1.Close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	var calls int32
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		n := atomic.AddInt32(&calls, 1)
+		if n == 1 {
+			cancel()
+			w.Header().Set("Content-Type", "application/json")
+			fmt.Fprint(w, page([]string{record("p2", "i", "v2", 1)}, 2, 2))
+			return
+		}
+		http.Error(w, "should not be reached", http.StatusInternalServerError)
+	}))
+	defer srv2.Close()
+	s.client, _ = yeekeclient.New(srv2.URL)
+	if _, err := s.Sync(ctx, "manual"); err == nil {
+		t.Fatal("expected a context-cancellation error")
+	}
+
+	var p1 models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p1").First(&p1).Error; e != nil {
+		t.Fatal(e)
+	}
+	if p1.SyncStatus != "ok" || p1.MissingSince != nil {
+		t.Fatalf("p1 must stay ok after a context-cancelled run, got %+v", p1)
+	}
+}
+
+// TestDuplicateFingerprintStopsMarking: the walk ends via the
+// duplicate-page break, not a natural stop, so nothing must be marked even
+// though only p1 (not p2 from an earlier sync) is ever reported.
+func TestDuplicateFingerprintStopsMarking(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 1})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p2", "i", "v2", 1)}, 1, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("first sync (seeds p2): %v", err)
+	}
+	srv1.Close()
+
+	// Second run: page 1 returns p1, but the server (mis)reports pages=5 and
+	// then serves the exact same page again, triggering the duplicate break
+	// before ever reaching a natural stop.
+	body := page([]string{record("p1", "i", "v1", 1)}, 10, 5)
+	var calls int32
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		atomic.AddInt32(&calls, 1)
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, body)
+	}))
+	defer srv2.Close()
+	s.client, _ = yeekeclient.New(srv2.URL)
+	rep, err := s.Sync(context.Background(), "manual")
+	if err != nil {
+		t.Fatalf("second sync: %v", err)
+	}
+	if rep.MissingMarked != 0 {
+		t.Fatalf("MissingMarked=%d, want 0 (duplicate-fingerprint stop is not complete)", rep.MissingMarked)
+	}
+
+	var p2 models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p2").First(&p2).Error; e != nil {
+		t.Fatal(e)
+	}
+	if p2.SyncStatus != "ok" || p2.MissingSince != nil {
+		t.Fatalf("p2 must stay ok after a duplicate-fingerprint stop, got %+v", p2)
+	}
+}
+
+// TestMaxPagesExhaustionStopsMarking: MaxPages is reached without any
+// natural stop condition being hit, so nothing must be marked.
+func TestMaxPagesExhaustionStopsMarking(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 1})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p2", "i", "v2", 1)}, 1, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("first sync (seeds p2): %v", err)
+	}
+	srv1.Close()
+
+	// Second run: every page returns a distinct full page (never short,
+	// never empty, pages always reported far beyond MaxPages), so the walk
+	// only stops because MaxPages is exhausted.
+	var n int32
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		k := atomic.AddInt32(&n, 1)
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record(fmt.Sprintf("p1-%d", k), "i", "v1", 1)}, 1000, 1000))
+	}))
+	defer srv2.Close()
+	s.client, _ = yeekeclient.New(srv2.URL)
+	s.cfg.MaxPages = 2
+	rep, err := s.Sync(context.Background(), "manual")
+	if err != nil {
+		t.Fatalf("second sync: %v", err)
+	}
+	if rep.MissingMarked != 0 {
+		t.Fatalf("MissingMarked=%d, want 0 (MaxPages exhaustion is not complete)", rep.MissingMarked)
+	}
+
+	var p2 models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p2").First(&p2).Error; e != nil {
+		t.Fatal(e)
+	}
+	if p2.SyncStatus != "ok" || p2.MissingSince != nil {
+		t.Fatalf("p2 must stay ok after MaxPages exhaustion, got %+v", p2)
+	}
+}
+
+// TestSafetyValveSkipsMarkingWhenOverThreshold: 3 packages are "ok"; a
+// complete follow-up run only reports 1 of them (2 of 3 = 67% would be
+// marked, well over the 20% threshold). Nothing must be marked, and the
+// run's error_message must explain why.
+func TestSafetyValveSkipsMarkingWhenOverThreshold(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 10})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p1", "i", "v1", 1), record("p2", "i", "v2", 1), record("p3", "i", "v3", 1)}, 3, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("first sync: %v", err)
+	}
+	srv1.Close()
+
+	time.Sleep(1100 * time.Millisecond)
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p1", "i", "v1", 1)}, 1, 1))
+	}))
+	defer srv2.Close()
+	s.client, _ = yeekeclient.New(srv2.URL)
+	rep, err := s.Sync(context.Background(), "manual")
+	if err != nil {
+		t.Fatalf("second sync: %v", err)
+	}
+	if rep.Status != "succeeded" {
+		t.Fatalf("safety valve must not fail the run, got status=%q", rep.Status)
+	}
+	if rep.MissingMarked != 0 {
+		t.Fatalf("MissingMarked=%d, want 0 (over the 20%% safety valve)", rep.MissingMarked)
+	}
+	var run models.YeekeSyncRun
+	if e := db.First(&run, rep.RunID).Error; e != nil {
+		t.Fatal(e)
+	}
+	if !strings.Contains(run.ErrorMessage, "20%") {
+		t.Fatalf("run.ErrorMessage=%q, want an explanation mentioning the 20%% safety valve", run.ErrorMessage)
+	}
+
+	for _, ext := range []string{"p2", "p3"} {
+		var p models.YeekeReturnPackage
+		if e := db.Where("external_id = ?", ext).First(&p).Error; e != nil {
+			t.Fatal(e)
+		}
+		if p.SyncStatus != "ok" || p.MissingSince != nil {
+			t.Fatalf("%s must stay ok when the safety valve trips, got %+v", ext, p)
+		}
+	}
+}
+
+// TestReappearingRecordRecoversFromMissing: a package/item marked missing by
+// an earlier complete run reappears in a later sync and must recover to
+// sync_status="ok" with missing_since cleared.
+func TestReappearingRecordRecoversFromMissing(t *testing.T) {
+	db := testDB(t)
+	c, _ := yeekeclient.New("http://unused.invalid")
+	s := NewService(db, c, Config{PageSize: 10})
+
+	srv1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page(fivePackagesFirstReport(), 5, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv1.URL)
+	if _, err := s.Sync(context.Background(), "manual"); err != nil {
+		t.Fatalf("run 1: %v", err)
+	}
+	srv1.Close()
+
+	time.Sleep(1100 * time.Millisecond)
+	srv2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page([]string{record("p2", "i", "vp2", 1), record("p3", "i", "vp3", 1), record("p4", "i", "vp4", 1), record("p5", "i", "vp5", 1)}, 4, 1))
+	}))
+	s.client, _ = yeekeclient.New(srv2.URL)
+	rep2, err := s.Sync(context.Background(), "manual")
+	if err != nil {
+		t.Fatalf("run 2: %v", err)
+	}
+	if rep2.MissingMarked != 1 {
+		t.Fatalf("run2 MissingMarked=%d, want 1", rep2.MissingMarked)
+	}
+	srv2.Close()
+
+	var p1 models.YeekeReturnPackage
+	db.Where("external_id = ?", "p1").First(&p1)
+	if p1.SyncStatus != "missing" || p1.MissingSince == nil {
+		t.Fatalf("p1 must be missing before recovery, got %+v", p1)
+	}
+
+	srv3 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		fmt.Fprint(w, page(fivePackagesFirstReport(), 5, 1))
+	}))
+	defer srv3.Close()
+	s.client, _ = yeekeclient.New(srv3.URL)
+	rep3, err := s.Sync(context.Background(), "manual")
+	if err != nil {
+		t.Fatalf("run 3 (recovery): %v", err)
+	}
+	if rep3.Recovered != 1 || rep3.MissingMarked != 0 {
+		t.Fatalf("run3 Recovered=%d MissingMarked=%d, want 1 and 0", rep3.Recovered, rep3.MissingMarked)
+	}
+	// Both counters are persisted on the run rows shown by the sync-runs page.
+	var run2, run3 models.YeekeSyncRun
+	if e := db.First(&run2, rep2.RunID).Error; e != nil {
+		t.Fatal(e)
+	}
+	if e := db.First(&run3, rep3.RunID).Error; e != nil {
+		t.Fatal(e)
+	}
+	if run2.MissingMarkedCount != 1 || run2.RecoveredCount != 0 || run3.MissingMarkedCount != 0 || run3.RecoveredCount != 1 {
+		t.Fatalf("persisted counts run2=(%d,%d) run3=(%d,%d), want (1,0) and (0,1)", run2.MissingMarkedCount, run2.RecoveredCount, run3.MissingMarkedCount, run3.RecoveredCount)
+	}
+
+	// A fresh variable is used here (not the p1 declared above): GORM's Scan
+	// does not reset an already non-nil pointer field to nil when the new
+	// row's column is NULL, so reusing the earlier struct would misreport a
+	// stale MissingSince even though the row itself recovered correctly.
+	var recovered models.YeekeReturnPackage
+	if e := db.Where("external_id = ?", "p1").First(&recovered).Error; e != nil {
+		t.Fatal(e)
+	}
+	if recovered.SyncStatus != "ok" || recovered.MissingSince != nil {
+		t.Fatalf("p1 must recover to ok with missing_since cleared, got %+v", recovered)
+	}
+	var i1 models.YeekeReturnItem
+	if e := db.Where("package_id = ?", recovered.ID).First(&i1).Error; e != nil {
+		t.Fatal(e)
+	}
+	if i1.SyncStatus != "ok" || i1.MissingSince != nil {
+		t.Fatalf("p1's item must recover to ok with missing_since cleared, got %+v", i1)
+	}
+}

server/cmd/migrate/migration/version-local/1789800700000_return_match.go

@@ -0,0 +1,25 @@
+package version_local
+
+import (
+	"go-admin/app/goauto/migrations"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+	"gorm.io/gorm"
+	"runtime"
+)
+
+// #338: creates return_match and return_match_log (registered in
+// migrations.MigratedModels) on databases whose earlier versions are already
+// recorded in sys_migration.
+func init() {
+	_, f, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(f), migrateReturnMatch)
+}
+func migrateReturnMatch(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		if err := migrations.Migrate(tx); err != nil {
+			return err
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}

server/cmd/migrate/migration/version-local/1789800800000_return_match_batch.go

@@ -0,0 +1,25 @@
+package version_local
+
+import (
+	"go-admin/app/goauto/migrations"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+	"gorm.io/gorm"
+	"runtime"
+)
+
+// #338: creates return_match_batch (registered in
+// migrations.MigratedModels) on databases whose earlier versions are already
+// recorded in sys_migration.
+func init() {
+	_, f, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(f), migrateReturnMatchBatch)
+}
+func migrateReturnMatchBatch(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		if err := migrations.Migrate(tx); err != nil {
+			return err
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}

server/cmd/migrate/migration/version-local/1789800900000_return_missing.go

@@ -0,0 +1,28 @@
+package version_local
+
+import (
+	"go-admin/app/goauto/migrations"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+	"gorm.io/gorm"
+	"runtime"
+)
+
+// #338 scope addition: adds the nullable missing_since column to
+// yeeke_return_package and yeeke_return_item (models.YeekeReturnPackage /
+// models.YeekeReturnItem, registered in migrations.MigratedModels) on
+// databases whose earlier versions are already recorded in sys_migration.
+// AutoMigrate alone never reaches an existing database without a version
+// file like this one being run by the migrate command.
+func init() {
+	_, f, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(f), migrateReturnMissing)
+}
+func migrateReturnMissing(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		if err := migrations.Migrate(tx); err != nil {
+			return err
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}

server/cmd/migrate/migration/version-local/1789801000000_yeeke_sync_run_missing_counts.go

@@ -0,0 +1,25 @@
+package version_local
+
+import (
+	"go-admin/app/goauto/migrations"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+	"gorm.io/gorm"
+	"runtime"
+)
+
+// #338: adds yeeke_sync_run.missing_marked_count and recovered_count (registered in
+// migrations.MigratedModels) on databases whose earlier versions are already
+// recorded in sys_migration.
+func init() {
+	_, f, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(f), migrateYeekeSyncRunMissingCounts)
+}
+func migrateYeekeSyncRunMissingCounts(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		if err := migrations.Migrate(tx); err != nil {
+			return err
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}

server/cmd/migrate/migration/version-local/1789801200000_after_sales_return_match.go

@@ -0,0 +1,76 @@
+package version_local
+
+import (
+	"fmt"
+	"runtime"
+
+	"go-admin/app/goauto/access"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+	"gorm.io/gorm"
+)
+
+// #341 follow-up: the after-sales role was created before #338 added the
+// return-match API surface. Add only the reviewed return-match grants so the
+// existing role can use the new SYB action without recreating or changing its
+// users.
+func init() {
+	_, fileName, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(fileName), migrateAfterSalesReturnMatch)
+}
+
+type afterSalesReturnMatchAPI struct {
+	ID     int    `gorm:"column:id;primaryKey;autoIncrement"`
+	Title  string `gorm:"column:title;size:128"`
+	Path   string `gorm:"column:path;size:128"`
+	Type   string `gorm:"column:type;size:16"`
+	Action string `gorm:"column:action;size:16"`
+}
+
+func (afterSalesReturnMatchAPI) TableName() string { return "sys_api" }
+
+type afterSalesReturnMatchPolicy struct {
+	ID    uint   `gorm:"column:id;primaryKey;autoIncrement"`
+	Ptype string `gorm:"column:ptype;size:100"`
+	V0    string `gorm:"column:v0;size:100"`
+	V1    string `gorm:"column:v1;size:100"`
+	V2    string `gorm:"column:v2;size:100"`
+	V3    string `gorm:"column:v3;size:100"`
+	V4    string `gorm:"column:v4;size:100"`
+	V5    string `gorm:"column:v5;size:100"`
+}
+
+func (afterSalesReturnMatchPolicy) TableName() string { return "casbin_rule" }
+
+func migrateAfterSalesReturnMatch(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		var role struct {
+			RoleID int `gorm:"column:role_id"`
+		}
+		if err := tx.Table("sys_role").Select("role_id").Where("role_key = ?", access.RoleAfterSales).First(&role).Error; err != nil {
+			return fmt.Errorf("find after-sales role: %w", err)
+		}
+		for _, permission := range access.AdminAPIs {
+			if len(permission.Path) < len("/api/admin/v1/return-matches") || permission.Path[:len("/api/admin/v1/return-matches")] != "/api/admin/v1/return-matches" {
+				continue
+			}
+			api := afterSalesReturnMatchAPI{}
+			if err := tx.Where("path = ? AND action = ?", permission.Path, permission.Method).
+				Assign(afterSalesReturnMatchAPI{Title: permission.Title, Type: "BUS"}).
+				FirstOrCreate(&api).Error; err != nil {
+				return fmt.Errorf("ensure return-match API: %w", err)
+			}
+			policy := afterSalesReturnMatchPolicy{Ptype: "p", V0: access.RoleAfterSales, V1: permission.Path, V2: permission.Method}
+			var count int64
+			if err := tx.Model(&afterSalesReturnMatchPolicy{}).Where("ptype = ? AND v0 = ? AND v1 = ? AND v2 = ?", policy.Ptype, policy.V0, policy.V1, policy.V2).Count(&count).Error; err != nil {
+				return err
+			}
+			if count == 0 {
+				if err := tx.Create(&policy).Error; err != nil {
+					return err
+				}
+			}
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}

web/src/api/goauto/return-matches.js

@@ -0,0 +1,25 @@
+import request from '@/utils/request'
+
+export function listReturnMatches(params, options = {}) {
+  return request({ url: '/api/admin/v1/return-matches', method: 'get', params, ...options })
+}
+
+export function getReturnMatch(matchId, options = {}) {
+  return request({ url: `/api/admin/v1/return-matches/${matchId}`, method: 'get', ...options })
+}
+
+export function batchMatchReturns(data) {
+  return request({ url: '/api/admin/v1/return-matches/batch-match', method: 'post', data })
+}
+
+export function confirmReturnMatch(matchId) {
+  return request({ url: `/api/admin/v1/return-matches/${matchId}/confirm`, method: 'post' })
+}
+
+export function cancelReturnMatch(matchId) {
+  return request({ url: `/api/admin/v1/return-matches/${matchId}/cancel`, method: 'post' })
+}
+
+export function remarkReturnMatch(matchId, data) {
+  return request({ url: `/api/admin/v1/return-matches/${matchId}/remark`, method: 'post', data })
+}

web/src/views/goauto/syb-products/index.vue

@@ -12,7 +12,7 @@
           <el-form-item label="订单号"><el-input v-model="query.orderCodesText" type="textarea" :autosize="{ minRows: 1, maxRows: 4 }" resize="none" class="order-codes-input" placeholder="每行一个订单号，最多 100 个" @keydown.ctrl.enter.prevent="search" /></el-form-item>
           <el-form-item label="解析状态"><el-select v-model="query.parseStatus" clearable placeholder="全部" style="width: 110px"><el-option label="成功" value="success" /><el-option label="失败" value="failed" /></el-select></el-form-item>
           <el-form-item label="处理阶段"><el-select v-model="query.processStage" clearable placeholder="全部" style="width: 132px"><el-option v-for="item in processStageOptions" :key="item.value" :label="item.label" :value="item.value" /></el-select></el-form-item>
-          <el-form-item class="toolbar-actions"><el-button type="primary" :icon="Search" @click="search">查询</el-button><el-button :icon="RefreshLeft" @click="reset">重置</el-button><el-tooltip v-if="canPurchase" :content="aiMatchButtonReason" :disabled="!aiMatchButtonReason" placement="top"><span class="action-button-wrap"><el-button :loading="specMatchLoading" :disabled="purchaseReadinessLoading || specMatchLoading || aiMatchCandidates.length === 0" @click="runBatchSpecMatch">AI 匹配<span class="action-count">{{ aiMatchCandidates.length }}</span></el-button></span></el-tooltip><el-button v-if="canPurchase" type="success" plain :disabled="imageSearchRows.length === 0" @click="openImageSearchBatch">图搜采集<span class="action-count">{{ imageSearchRows.length }}</span></el-button><el-button v-if="canPurchase" type="primary" :loading="purchaseReadinessLoading" :disabled="purchaseReadinessLoading || specMatchLoading || collectionCandidates.length === 0" @click="openCollectionBatch">创建采集<span class="action-count action-count-primary">{{ collectionCandidates.length }}</span></el-button><el-button v-if="canPurchase" type="primary" :loading="purchaseReadinessLoading" :disabled="purchaseReadinessLoading || specMatchLoading || purchaseCandidates.length === 0" @click="openPurchaseBatch">创建采购<span class="action-count action-count-primary">{{ purchaseCandidates.length }}</span></el-button></el-form-item>
+          <el-form-item class="toolbar-actions"><el-button type="primary" :icon="Search" @click="search">查询</el-button><el-button :icon="RefreshLeft" @click="reset">重置</el-button><el-tooltip v-if="canPurchase" :content="aiMatchButtonReason" :disabled="!aiMatchButtonReason" placement="top"><span class="action-button-wrap"><el-button :loading="specMatchLoading" :disabled="purchaseReadinessLoading || specMatchLoading || aiMatchCandidates.length === 0" @click="runBatchSpecMatch">AI 匹配<span class="action-count">{{ aiMatchCandidates.length }}</span></el-button></span></el-tooltip><el-button v-if="canPurchase" type="success" plain :disabled="imageSearchRows.length === 0" @click="openImageSearchBatch">图搜采集<span class="action-count">{{ imageSearchRows.length }}</span></el-button><el-button v-if="canPurchase" type="primary" :loading="purchaseReadinessLoading" :disabled="purchaseReadinessLoading || specMatchLoading || collectionCandidates.length === 0" @click="openCollectionBatch">创建采集<span class="action-count action-count-primary">{{ collectionCandidates.length }}</span></el-button><el-button v-if="canPurchase" type="primary" :loading="purchaseReadinessLoading" :disabled="purchaseReadinessLoading || specMatchLoading || purchaseCandidates.length === 0" @click="openPurchaseBatch">创建采购<span class="action-count action-count-primary">{{ purchaseCandidates.length }}</span></el-button><el-button v-if="canPurchase" :loading="returnMatchBatchLoading" :disabled="purchaseReadinessLoading || returnMatchBatchLoading || returnMatchCandidateIds.length === 0" @click="runBatchMatchReturns">匹配退货<span class="action-count">{{ returnMatchCandidateIds.length }}</span></el-button></el-form-item>
         </el-form>
         <el-alert v-if="canPurchase" title="先完成并保存规格匹配，商品才可以创建采购；AI 匹配只处理已解析规格、已关联 PDD 且具备完整可售 SKU 组合的明细。表头全选仅作用于当前页。" type="info" :closable="false" show-icon class="notice compact-notice" />
         <el-table ref="productTable" v-loading="loading" :data="products" row-key="id" border stripe empty-text="暂无 SYB 商品明细" @selection-change="handleSelectionChange">
@@ -51,6 +51,28 @@
               <div v-if="quickBusyId === row.id || quickMessages[row.id]" class="muted" aria-live="polite">{{ quickBusyId === row.id ? quickPhase : quickMessages[row.id] }}</div>
             </template>
           </el-table-column>
+          <el-table-column label="匹配到的退货商品" min-width="200">
+            <template #default="{ row }">
+              <template v-if="returnMatchByProductId[row.id]">
+                <div class="return-match-cell">
+                  <el-image v-if="returnMatchByProductId[row.id].image" :src="returnMatchByProductId[row.id].image" fit="cover" class="thumb" preview-teleported />
+                  <div>
+                    <div>{{ returnMatchByProductId[row.id].orderSn || '—' }}</div>
+                    <div class="muted">{{ returnMatchByProductId[row.id].variationName || '—' }}</div>
+                    <div class="muted">销毁截止：{{ formatMatchDeadline(returnMatchByProductId[row.id].destroyDeadline) }}</div>
+                  </div>
+                </div>
+                <el-alert v-if="returnMatchByProductId[row.id].syncStatus === 'missing'" title="退货已不在 yeeke 列表" type="error" :closable="false" show-icon class="return-missing-alert" />
+                <el-alert v-if="isDeadlinePassed(returnMatchByProductId[row.id].destroyDeadline)" title="退货已过销毁截止" type="error" :closable="false" show-icon class="return-missing-alert" />
+                <div class="quick-link-actions">
+                  <el-button type="primary" link @click="openMatchDetail(returnMatchByProductId[row.id].id)">查看对比</el-button>
+                  <el-button v-if="canPurchase" type="primary" link @click="openMatchDetail(returnMatchByProductId[row.id].id, true)">备注</el-button>
+                  <el-button v-if="canPurchase" type="danger" link @click="quickCancelMatch(returnMatchByProductId[row.id].id)">取消匹配</el-button>
+                </div>
+              </template>
+              <span v-else class="muted">未匹配</span>
+            </template>
+          </el-table-column>
           <el-table-column label="操作" width="132" fixed="right"><template #default="{ row }"><el-button type="primary" link @click="openDetail(row.id)">详情</el-button><el-button v-if="canPurchase && isPurchaseCandidate(row)" type="primary" link @click="openSinglePurchase(row)">采购</el-button></template></el-table-column>
         </el-table>
         <pagination v-show="total > 0" v-model:current-page="query.page" v-model:page-size="query.pageSize" :total="total" @pagination="load" />
@@ -162,6 +184,82 @@
         <template #footer><el-button type="primary" @click="specMatchResult.open = false">关闭</el-button></template>
       </el-dialog>
 
+      <!-- 匹配退货批量结果 -->
+      <el-dialog v-model="returnMatchBatchResult.open" title="批量匹配退货结果" width="820px">
+        <div class="purchase-summary" aria-live="polite">
+          <span class="success-text">成功匹配 <strong>{{ returnMatchBatchResult.matchedCount }}</strong> 条</span>
+          <span>无候选 <strong>{{ returnMatchBatchResult.noCandidateCount }}</strong> 条</span>
+          <span>阶段不参与跳过 <strong>{{ returnMatchBatchResult.stageIneligibleCount }}</strong> 条</span>
+          <span v-if="returnMatchBatchResult.conflictCount" class="danger-text">并发冲突跳过 <strong>{{ returnMatchBatchResult.conflictCount }}</strong> 条</span>
+        </div>
+        <el-table :data="returnMatchBatchResult.items" border size="small" max-height="420" empty-text="没有匹配结果">
+          <el-table-column label="SYB 商品 ID" prop="sybProductId" width="120" />
+          <el-table-column label="结果" width="100"><template #default="{ row }"><el-tag :type="row.matched ? 'success' : 'warning'">{{ row.matched ? '已匹配' : '跳过' }}</el-tag></template></el-table-column>
+          <el-table-column label="原因" min-width="260"><template #default="{ row }">{{ row.matched ? '—' : (row.reason || matchReasonMeta(row.reasonCode)) }}</template></el-table-column>
+          <el-table-column label="操作" width="100"><template #default="{ row }"><el-button v-if="row.matched && row.matchId" type="primary" link @click="openMatchDetail(row.matchId)">查看对比</el-button></template></el-table-column>
+        </el-table>
+        <template #footer><el-button type="primary" @click="returnMatchBatchResult.open = false">关闭</el-button></template>
+      </el-dialog>
+
+      <!-- 匹配详情对比 -->
+      <el-dialog v-model="matchDetail.open" title="退货匹配详情" width="900px" :close-on-click-modal="false">
+        <div v-loading="matchDetail.loading">
+          <template v-if="matchDetail.data">
+            <el-alert :title="'当前状态：' + matchStatusLabel(matchDetail.data.match.status)" :type="matchDetail.data.match.status === 'confirmed' ? 'success' : matchDetail.data.match.status === 'cancelled' ? 'info' : 'warning'" :closable="false" show-icon class="notice" />
+            <div class="split">
+              <div class="split-col">
+                <h3 class="section-title">SYB 商品</h3>
+                <el-descriptions :column="1" border size="small" v-if="matchDetail.data.syb">
+                  <el-descriptions-item label="订单号">{{ matchDetail.data.syb.orderCode }}</el-descriptions-item>
+                  <el-descriptions-item label="虾皮商品ID">{{ matchDetail.data.syb.shopeeItemId }}</el-descriptions-item>
+                  <el-descriptions-item label="店铺">{{ matchDetail.data.syb.shopName }}</el-descriptions-item>
+                  <el-descriptions-item label="标题">{{ matchDetail.data.syb.productTitle }}</el-descriptions-item>
+                  <el-descriptions-item label="目标颜色/尺码">{{ matchDetail.data.syb.targetColor || '—' }} / {{ matchDetail.data.syb.targetSize || '—' }}</el-descriptions-item>
+                  <el-descriptions-item label="数量">{{ matchDetail.data.syb.quantity }}</el-descriptions-item>
+                  <el-descriptions-item label="当前阶段"><el-tag :type="processMeta(matchDetail.data.syb.currentStage).type">{{ matchDetail.data.syb.currentStageLabel }}</el-tag></el-descriptions-item>
+                  <el-descriptions-item label="归一化规格文字">{{ matchDetail.data.normalizedSybSpec }}</el-descriptions-item>
+                </el-descriptions>
+                <p v-else class="muted">SYB 商品不存在或已删除</p>
+              </div>
+              <div class="split-col">
+                <h3 class="section-title">yeeke 退货商品</h3>
+                <el-alert v-if="matchDetail.data.yeeke && matchDetail.data.yeeke.syncStatus === 'missing'" title="退货已不在 yeeke 列表" type="error" :closable="false" show-icon class="notice" />
+                <el-alert v-if="matchDetail.data.yeeke && isDeadlinePassed(matchDetail.data.yeeke.destroyDeadline)" title="退货已过销毁截止，请核实退货是否仍在库" type="error" :closable="false" show-icon class="notice" />
+                <el-descriptions :column="1" border size="small" v-if="matchDetail.data.yeeke">
+                  <el-descriptions-item label="退货订单号">{{ matchDetail.data.yeeke.orderSn }}</el-descriptions-item>
+                  <el-descriptions-item label="商品ID">{{ matchDetail.data.yeeke.itemId }}</el-descriptions-item>
+                  <el-descriptions-item label="规格ID">{{ matchDetail.data.yeeke.variationId }}</el-descriptions-item>
+                  <el-descriptions-item label="店铺">{{ matchDetail.data.yeeke.shopName }}</el-descriptions-item>
+                  <el-descriptions-item label="商品名">{{ matchDetail.data.yeeke.itemName }}</el-descriptions-item>
+                  <el-descriptions-item label="规格文字">{{ matchDetail.data.yeeke.variationName }}</el-descriptions-item>
+                  <el-descriptions-item label="数量">{{ matchDetail.data.yeeke.quantity }}</el-descriptions-item>
+                  <el-descriptions-item label="销毁截止">{{ formatMatchDeadline(matchDetail.data.yeeke.destroyDeadline) }}</el-descriptions-item>
+                  <el-descriptions-item label="归一化规格文字">{{ matchDetail.data.normalizedYeekeSpec }}</el-descriptions-item>
+                </el-descriptions>
+                <p v-else class="muted">退货商品不存在或已删除</p>
+              </div>
+            </div>
+            <h3 class="section-title">备注</h3>
+            <el-input ref="matchRemarkInput" v-model="matchDetail.remarkText" type="textarea" :rows="2" maxlength="500" show-word-limit :disabled="!canPurchase" />
+            <div class="drawer-actions">
+              <el-button v-if="canPurchase" :loading="matchDetail.saving" @click="saveMatchRemark">保存备注</el-button>
+            </div>
+            <h3 class="section-title">操作日志</h3>
+            <el-table :data="matchDetail.data.logs" border size="small" max-height="220" empty-text="暂无日志">
+              <el-table-column label="时间" width="170"><template #default="{ row }">{{ formatMatchDeadline(row.createdAt) }}</template></el-table-column>
+              <el-table-column label="动作" width="90" prop="action" />
+              <el-table-column label="操作人" width="100" prop="operator" />
+              <el-table-column label="详情" min-width="200" prop="detail" />
+            </el-table>
+          </template>
+        </div>
+        <template #footer>
+          <el-button @click="matchDetail.open = false">关闭</el-button>
+          <el-button v-if="canPurchase && matchDetail.data && matchDetail.data.match.status === 'matched'" type="success" @click="confirmMatchDetail">确认</el-button>
+          <el-button v-if="canPurchase && matchDetail.data && matchDetail.data.match.status !== 'cancelled'" type="danger" @click="cancelMatchDetail">取消匹配</el-button>
+        </template>
+      </el-dialog>
+
       <!-- 详情 -->
       <el-drawer v-model="detail.open" title="SYB 商品明细详情" size="960px">
         <div v-loading="detail.loading" class="drawer-body">
@@ -227,6 +325,7 @@ import { listDevices } from '@/api/goauto/devices'
 import { createPurchaseTasksBatch, matchPurchaseSpecsBatch, previewPurchaseTasks } from '@/api/goauto/purchase-tasks'
 import { batchCreateCollectionTasks, batchCreateImageSearchCollectionTasks } from '@/api/goauto/collection-tasks'
 import { listCollectionRules } from '@/api/goauto/collection-rules'
+import { listReturnMatches, batchMatchReturns, getReturnMatch, confirmReturnMatch, cancelReturnMatch, remarkReturnMatch } from '@/api/goauto/return-matches'
 import { createRequestId } from '@/utils/request-id'
 import { readPurchaseDevice, rememberPurchaseDevice } from '@/utils/purchase-device-preference'
 import ShopeeProductDetailDrawer from '../shopee-products/ShopeeProductDetailDrawer.vue'
@@ -255,6 +354,11 @@ export default {
       collectionBatchData: { ruleId: null, deviceId: null },
       collectionBatchRules: { ruleId: [{ required: true, message: '请选择采集规则', trigger: 'change' }] },
       query: { page: 1, pageSize: 20, shopName: '', orderCodesText: '', parseStatus: '', processStage: '' },
+      returnMatchByProductId: {},
+      returnMatchLoading: false,
+      returnMatchBatchLoading: false,
+      returnMatchBatchResult: { open: false, items: [], matchedCount: 0, noCandidateCount: 0, stageIneligibleCount: 0, conflictCount: 0 },
+      matchDetail: { open: false, loading: false, saving: false, id: null, data: null, remarkText: '' },
       detail: { open: false, loading: false, item: null },
       correct: { open: false, saving: false, productId: null, targetColor: '', targetSize: '' },
       shopeeDetail: { open: false, productId: null, targetColor: '', action: '' },
@@ -265,7 +369,8 @@ export default {
     purchaseDeviceUnavailable() { return !!this.purchaseDialog.deviceId && !this.purchaseDevices.some(device => device.id === this.purchaseDialog.deviceId) },
     purchaseImageSearchLinkedCount() { return this.purchaseDialog.items.filter(item => item.imageSearchLinked).length },
     canPurchase() { const roles = this.$store.getters.roles || []; return roles.includes('admin') || roles.includes('purchaser') || roles.includes('after_sales') },
-    processStageOptions() { return [{ value: 'manual_action', label: '待人工处理' }, { value: 'pdd_unlinked', label: '未关联 PDD' }, { value: 'pdd_pending', label: 'PDD 待采集' }, { value: 'pdd_collecting', label: 'PDD 采集中' }, { value: 'pdd_collection_failed', label: 'PDD 采集失败' }, { value: 'color_mapping', label: '规格待匹配' }, { value: 'purchase_ready', label: '可创建采购' }, { value: 'task_created', label: '已创建任务' }, { value: 'purchase_succeeded', label: '采购成功' }, { value: 'order_review', label: '待人工核对' }] },
+    processStageOptions() { return [{ value: 'manual_action', label: '待人工处理' }, { value: 'pdd_unlinked', label: '未关联 PDD' }, { value: 'pdd_pending', label: 'PDD 待采集' }, { value: 'pdd_collecting', label: 'PDD 采集中' }, { value: 'pdd_collection_failed', label: 'PDD 采集失败' }, { value: 'color_mapping', label: '规格待匹配' }, { value: 'purchase_ready', label: '可创建采购' }, { value: 'task_created', label: '已创建任务' }, { value: 'purchase_succeeded', label: '采购成功' }, { value: 'order_review', label: '待人工核对' }, { value: 'return_pending', label: '退货待确认' }, { value: 'return_used', label: '已用退货' }] },
+    returnMatchCandidateIds() { return this.selectedProducts.filter(row => this.isReturnMatchCandidate(row)).map(row => row.id) },
     aiMatchCandidates() { return this.selectedProducts.filter(row => this.purchaseReady(row).aiMatchEligible === true) },
     aiMatchButtonReason() {
       if (this.purchaseReadinessLoading) return '正在检查 AI 匹配资格'
@@ -313,6 +418,7 @@ export default {
         this.total = r.data.total
         this.loading = false
         void this.loadPurchaseReadiness(this.products.map(item => item.id), requestOptions, generation)
+        void this.loadReturnMatches(this.products.map(item => item.id), generation)
       } catch (error) {
         if (generation !== this.loadGeneration) return
         if (allowNetworkRetry && error?.message === 'Network Error' && !error?.response) {
@@ -357,13 +463,19 @@ export default {
     // 不能要求已关联——另外三个判据都要求，于是图搜入口对它最该服务的那类商品
     // 一直不可达（#291）。这里与 imageSearchRows 的过滤条件保持一致。
     isImageSearchCandidate(row) { return Boolean(row.shopeeProductId && row.imageUrl) },
+    // #338: 参与匹配退货的处理阶段范围（服务端 returnmatch.participatingStages 同一口径）。
+    isReturnMatchCandidate(row) {
+      const participating = new Set(['pdd_unlinked', 'pdd_pending', 'pdd_collecting', 'pdd_collection_failed', 'color_mapping', 'purchase_ready'])
+      return participating.has(this.purchaseReady(row).processStage)
+    },
+    isActivelyReturnMatched(row) { const stage = this.purchaseReady(row).processStage; return stage === 'return_pending' || stage === 'return_used' },
     // `[必须]` 可勾选不等于可采购。放宽的只有勾选：purchaseCandidates / collectionCandidates
-    // / aiMatchCandidates 仍各自用自己的判据过滤，采购门禁不受影响。
-    isSelectableCandidate(row) { return this.isPurchaseCandidate(row) || this.isCollectionCandidate(row) || this.isAIMatchCandidate(row) || this.isImageSearchCandidate(row) },
+    // / aiMatchCandidates / returnMatch 仍各自用自己的判据过滤，采购门禁不受影响。
+    isSelectableCandidate(row) { return this.isPurchaseCandidate(row) || this.isCollectionCandidate(row) || this.isAIMatchCandidate(row) || this.isImageSearchCandidate(row) || this.isReturnMatchCandidate(row) },
     rowSelectable(row) { return this.canPurchase && !this.purchaseReadinessLoading && this.isSelectableCandidate(row) },
     purchaseReady(row) { return this.purchaseReadiness[row.id] || { sybProductId: row.id, eligible: false, reason: this.purchaseReadinessLoading ? '正在检查' : '请刷新后重试' } },
     purchasePriceText(item) { if (item.minUnitPriceCent === undefined || item.maxUnitPriceCent === undefined) return ''; return `允许单价 ¥${(item.minUnitPriceCent / 100).toFixed(2)}～¥${(item.maxUnitPriceCent / 100).toFixed(2)}` },
-    processMeta(stage) { return { manual_action: { label: '待人工处理', type: 'warning' }, pdd_unlinked: { label: '未关联 PDD', type: 'info' }, pdd_pending: { label: 'PDD 待采集', type: 'info' }, pdd_collecting: { label: 'PDD 采集中', type: 'primary' }, pdd_collection_failed: { label: 'PDD 采集失败', type: 'danger' }, color_mapping: { label: '规格待匹配', type: 'warning' }, purchase_ready: { label: '可创建采购', type: 'success' }, task_created: { label: '已创建任务', type: 'primary' }, purchase_succeeded: { label: '采购成功', type: 'success' }, order_review: { label: '待人工核对', type: 'danger' }}[stage] || { label: '待人工处理', type: 'warning' } },
+    processMeta(stage) { return { manual_action: { label: '待人工处理', type: 'warning' }, pdd_unlinked: { label: '未关联 PDD', type: 'info' }, pdd_pending: { label: 'PDD 待采集', type: 'info' }, pdd_collecting: { label: 'PDD 采集中', type: 'primary' }, pdd_collection_failed: { label: 'PDD 采集失败', type: 'danger' }, color_mapping: { label: '规格待匹配', type: 'warning' }, purchase_ready: { label: '可创建采购', type: 'success' }, task_created: { label: '已创建任务', type: 'primary' }, purchase_succeeded: { label: '采购成功', type: 'success' }, order_review: { label: '待人工核对', type: 'danger' }, return_pending: { label: '退货待确认', type: 'warning' }, return_used: { label: '已用退货', type: 'info' }}[stage] || { label: '待人工处理', type: 'warning' } },
     purchaseActionLabel(item) { return { open_pdd_link: '去关联', open_mapping: '去匹配', open_shopee: '查看蝦皮商品', open_pdd: '查看 PDD 商品', open_task: '查看任务', reparse: '查看并处理', select_device: '重新选择设备', refresh: '刷新' }[item.nextAction] || '' },
     async loadPurchaseReadiness(ids, requestOptions = {}, generation = this.loadGeneration, selectedIDsOverride = null) {
       if (generation !== this.loadGeneration) return
@@ -428,6 +540,109 @@ export default {
     },
     formatConfidence(value) { return Number.isFinite(value) ? `${Math.round(value * 100)}%` : '—' },
 
+    // ---------------- 退货匹配 (#338) ----------------
+    formatMatchDeadline(value) { return value ? new Date(value).toLocaleString() : '—' },
+    // #338: an already-matched return whose destroy deadline has passed is only flagged, never auto-cancelled.
+    isDeadlinePassed(value) { return Boolean(value) && new Date(value).getTime() <= Date.now() },
+    matchStatusLabel(status) { return { matched: '待确认', confirmed: '已确认', cancelled: '已取消' }[status] || status },
+    async loadReturnMatches(ids, generation = this.loadGeneration) {
+      this.returnMatchByProductId = {}
+      if (!ids.length) return
+      this.returnMatchLoading = true
+      try {
+        const r = await listReturnMatches({ sybProductId: ids }, { suppressErrorMessage: true })
+        if (generation !== this.loadGeneration) return
+        const map = {}
+        for (const item of (r.data?.items || [])) {
+          if (item.status === 'cancelled') continue
+          if (!map[item.sybProductId]) map[item.sybProductId] = item
+        }
+        this.returnMatchByProductId = map
+      } catch {
+        // 展示失败不影响主列表；用户可重新查询重试。
+      } finally {
+        if (generation === this.loadGeneration) this.returnMatchLoading = false
+      }
+    },
+    matchReasonMeta(code) {
+      return {
+        stage_ineligible: '阶段不参与',
+        no_candidate: '无候选',
+        conflict: '并发冲突'
+      }[code] || code
+    },
+    async runBatchMatchReturns() {
+      const ids = this.returnMatchCandidateIds
+      if (!ids.length || this.returnMatchBatchLoading) return
+      this.returnMatchBatchLoading = true
+      try {
+        const r = await batchMatchReturns({ sybProductIds: ids })
+        const items = r.data.items || []
+        this.returnMatchBatchResult = {
+          open: true, items,
+          matchedCount: r.data.matchedCount || 0,
+          noCandidateCount: items.filter(i => i.reasonCode === 'no_candidate').length,
+          stageIneligibleCount: items.filter(i => i.reasonCode === 'stage_ineligible').length,
+          conflictCount: items.filter(i => i.reasonCode === 'conflict').length
+        }
+        await this.load()
+      } finally {
+        this.returnMatchBatchLoading = false
+      }
+    },
+    async openMatchDetail(matchId, focusRemark = false) {
+      this.matchDetail = { open: true, loading: true, saving: false, id: matchId, data: null, remarkText: '' }
+      try {
+        const r = await getReturnMatch(matchId)
+        this.matchDetail.data = r.data
+        this.matchDetail.remarkText = r.data.match.remark || ''
+      } finally {
+        this.matchDetail.loading = false
+      }
+      if (focusRemark) this.$nextTick(() => this.$refs.matchRemarkInput?.focus())
+    },
+    async refreshMatchDetail() {
+      const r = await getReturnMatch(this.matchDetail.id)
+      this.matchDetail.data = r.data
+      this.matchDetail.remarkText = r.data.match.remark || ''
+      await this.load()
+    },
+    async saveMatchRemark() {
+      this.matchDetail.saving = true
+      try {
+        await remarkReturnMatch(this.matchDetail.id, { remark: this.matchDetail.remarkText })
+        ElMessage.success('已保存备注')
+        await this.refreshMatchDetail()
+      } finally {
+        this.matchDetail.saving = false
+      }
+    },
+    async confirmMatchDetail() {
+      try {
+        await this.$confirm('确认后该 SYB 商品状态变为「已用退货」，仍不能创建采购任务。确定继续？', '确认匹配', { type: 'warning' })
+      } catch { return }
+      await confirmReturnMatch(this.matchDetail.id)
+      ElMessage.success('已确认匹配')
+      await this.refreshMatchDetail()
+    },
+    async cancelMatchDetail() {
+      try {
+        await this.$confirm('取消后该 SYB 商品恢复可创建采购，对应退货商品回到可用池。确定取消匹配？', '取消匹配', { type: 'warning', confirmButtonClass: 'el-button--danger' })
+      } catch { return }
+      await cancelReturnMatch(this.matchDetail.id)
+      ElMessage.success('已取消匹配')
+      this.matchDetail.open = false
+      await this.load()
+    },
+    async quickCancelMatch(matchId) {
+      try {
+        await this.$confirm('取消后该 SYB 商品恢复可创建采购，对应退货商品回到可用池。确定取消匹配？', '取消匹配', { type: 'warning', confirmButtonClass: 'el-button--danger' })
+      } catch { return }
+      await cancelReturnMatch(matchId)
+      ElMessage.success('已取消匹配')
+      await this.load()
+    },
+
     // ---------------- 批量创建采购任务 ----------------
     async openSinglePurchase(row) {
       this.$refs.productTable?.clearSelection()
@@ -625,9 +840,11 @@ export default {
 .missing{color:#b91c1c}
 .quick-link-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:4px 0}
 .thumb{width:44px;height:44px;border-radius:4px;object-fit:cover}.thumb.placeholder{display:flex;align-items:center;justify-content:center;background:#f1f5f9;color:#909399;font-size:11px}
+.return-match-cell{display:flex;gap:8px;align-items:flex-start}
 .link{color:#1677ff;cursor:pointer}
 .shopee-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
 .notice{margin-bottom:16px}
+.return-missing-alert{margin:6px 0}
 .compact-notice{margin-bottom:12px}
 .purchase-summary{display:flex;flex-wrap:wrap;gap:12px 24px;margin-bottom:16px;padding:12px 16px;border:1px solid #dbeafe;border-radius:8px;background:#f8fafc}.purchase-summary strong{font-variant-numeric:tabular-nums;color:#1e40af}.success-text{color:#166534}.warning-text{color:#b45309}.danger-text,.purchase-reason{color:#b91c1c}.purchase-reason{margin-top:4px;font-size:12px;line-height:1.45}.purchase-settings{margin-bottom:12px}.field-help{margin-left:12px;color:#909399;font-size:12px}.ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.image-search-tag{margin-left:6px;vertical-align:middle}
 .spec-match-summary{gap:8px 24px}

web/src/views/goauto/yeeke-returns/index.vue

@@ -22,6 +22,11 @@
             </el-select>
           </el-form-item>
           <el-form-item label="创建时间"><el-date-picker v-model="createTimeRange" type="daterange" value-format="YYYY-MM-DD" range-separator="至" start-placeholder="开始日期" end-placeholder="结束日期" style="width:230px" /></el-form-item>
+          <el-form-item label="匹配状态">
+            <el-select v-model="query.matchStatus" clearable placeholder="全部" style="width:130px">
+              <el-option v-for="item in matchStatusOptions" :key="item.value" :label="item.label" :value="item.value" />
+            </el-select>
+          </el-form-item>
           <el-form-item><el-button type="primary" :icon="Search" @click="search">查询</el-button><el-button :icon="RefreshLeft" @click="reset">重置</el-button></el-form-item>
         </el-form>
 
@@ -61,9 +66,28 @@
               <el-tag v-else :type="claimStatusMeta(row.claimStatus).type">{{ claimStatusMeta(row.claimStatus).label }}</el-tag>
             </template>
           </el-table-column>
+          <el-table-column label="yeeke 可用性" min-width="150">
+            <template #default="{ row }">
+              <el-tag v-if="row.syncStatus === 'missing'" type="danger" effect="plain">不可用（yeeke 列表中已不存在）</el-tag>
+              <span v-else class="muted">—</span>
+            </template>
+          </el-table-column>
           <el-table-column label="上架时间" min-width="150"><template #default="{ row }">{{ formatTime(row.claimTime) }}</template></el-table-column>
           <el-table-column label="销毁截止" min-width="150"><template #default="{ row }">{{ formatTime(row.destroyDeadLine) }}</template></el-table-column>
           <el-table-column label="最近同步" min-width="150"><template #default="{ row }">{{ formatTime(row.lastSyncedAt) }}</template></el-table-column>
+          <el-table-column label="匹配状态" min-width="100">
+            <template #default="{ row }"><el-tag :type="matchStatusMeta(row.matchStatus).type" effect="plain">{{ matchStatusMeta(row.matchStatus).label }}</el-tag></template>
+          </el-table-column>
+          <el-table-column label="被占用 SYB 订单商品" min-width="180">
+            <template #default="{ row }">
+              <template v-if="row.occupyingSybProductId">
+                <a class="link" href="javascript:void(0)" @click="openSybProduct(row.occupyingSybProductId)">{{ row.occupyingSybOrderCode }} ↗</a>
+                <div class="muted">{{ row.occupyingSybStageLabel }}</div>
+                <div v-if="isDeadlinePassed(row.destroyDeadLine)" class="deadline-passed">已过销毁截止</div>
+              </template>
+              <span v-else class="muted">—</span>
+            </template>
+          </el-table-column>
           <el-table-column label="操作" width="90" fixed="right"><template #default="{ row }"><el-button type="primary" link @click="openDetail(row)">详情</el-button></template></el-table-column>
         </el-table>
         <pagination v-show="total > 0" v-model:current-page="query.page" v-model:page-size="query.pageSize" :total="total" @pagination="load" />
@@ -139,8 +163,15 @@ export default {
       loading: false, loadError: '', items: [], total: 0, createTimeRange: null,
       summary: { lastSuccessAt: '', lastRun: null }, summaryError: '',
       shopOptions: [],
-      query: { page: 1, pageSize: 20, orderSn: '', shop: '', claimStatus: '', createTimeFrom: '', createTimeTo: '' },
+      query: { page: 1, pageSize: 20, orderSn: '', shop: '', claimStatus: '', createTimeFrom: '', createTimeTo: '', matchStatus: '' },
       detail: { open: false, loading: false, placeholder: false, item: null, pkg: null, siblings: [] },
+      // #338: 匹配状态是只读信息筛选，未勾选/无写操作，按钮门禁规则里
+      // 「纯只读筛选可以照常展示」的部分——不需要 canPurchase 判断。
+      matchStatusOptions: [
+        { label: '未匹配', value: 'unmatched' },
+        { label: '退货待确认', value: 'matched' },
+        { label: '已用退货', value: 'confirmed' }
+      ],
       // yeeke's only confirmed claim-status value is the raw string "1"
       // (HAR evidence, #336 requirement doc). Any other value the sync sees
       // is preserved verbatim and flagged status_unrecognized — never
@@ -159,8 +190,12 @@ export default {
     // unmapped value we have not seen yet — show it as-is rather than a
     // bare digit or a guessed Chinese label.
     claimStatusMeta(status) { return status === '1' ? { label: '已认领', type: 'success' } : { label: status ? `其他：${status}` : '—', type: 'info' } },
+    matchStatusMeta(status) { return { unmatched: { label: '未匹配', type: 'info' }, matched: { label: '退货待确认', type: 'warning' }, confirmed: { label: '已用退货', type: 'success' }}[status] || { label: status || '—', type: 'info' } },
+    openSybProduct(sybProductId) { this.$router.push({ path: '/syb-products/index', query: { sybProductId } }) },
     statusMeta(status) { return { running: { label: '执行中', type: 'primary' }, succeeded: { label: '成功', type: 'success' }, failed: { label: '失败', type: 'danger' }, interrupted: { label: '已中断', type: 'warning' }}[status] || { label: status || '-', type: 'info' } },
     formatTime(value) { if (!value) return '—'; return new Date(value).toLocaleString('zh-CN', { hour12: false }) },
+    // #338: a matched return past its destroy deadline is flagged only, never auto-released.
+    isDeadlinePassed(value) { return Boolean(value) && new Date(value).getTime() <= Date.now() },
     async load() {
       this.loading = true; this.loadError = ''
       try {
@@ -202,7 +237,7 @@ export default {
     },
     reset() {
       this.createTimeRange = null
-      this.query = { page: 1, pageSize: 20, orderSn: '', shop: '', claimStatus: '', createTimeFrom: '', createTimeTo: '' }
+      this.query = { page: 1, pageSize: 20, orderSn: '', shop: '', claimStatus: '', createTimeFrom: '', createTimeTo: '', matchStatus: '' }
       this.load()
     },
     async openDetail(row) {
@@ -245,4 +280,5 @@ export default {
 .item-title{font-size:15px;font-weight:600;color:#1f2937;margin-bottom:4px}
 .muted{font-size:12px;color:#909399}
 @media(max-width:800px){.page-heading{flex-direction:column}}
+.deadline-passed{color:var(--el-color-danger);font-size:12px}
 </style>

web/src/views/goauto/yeeke-sync-runs/index.vue

@@ -41,6 +41,8 @@
           <el-table-column label="更新" prop="updatedCount" width="70" />
           <el-table-column label="跳过" prop="skippedCount" width="70" />
           <el-table-column label="失败" prop="failedCount" width="70" />
+          <el-table-column label="标记不可用" prop="missingMarkedCount" width="96" />
+          <el-table-column label="恢复可用" prop="recoveredCount" width="84" />
           <el-table-column label="脱敏原因" min-width="200"><template #default="{ row }">{{ row.errorMessage || '—' }}</template></el-table-column>
         </el-table>
         </div>