diff --git a/server/app/goauto/migrations/migrate.go b/server/app/goauto/migrations/migrate.go
index 12b9e11..207844d 100644
--- a/server/app/goauto/migrations/migrate.go
+++ b/server/app/goauto/migrations/migrate.go
@@ -13,6 +13,7 @@ func Migrate(db *gorm.DB) error {
 		&models.AgentDevice{},
 		&models.PDDProduct{},
 		&models.ShopeeProduct{},
+		&models.SYBProduct{},
 		&models.CollectionRule{},
 		&models.CollectionTask{},
 		&models.CollectionDimension{},
diff --git a/server/app/goauto/migrations/migrate_test.go b/server/app/goauto/migrations/migrate_test.go
index 75bca33..3fc8570 100644
--- a/server/app/goauto/migrations/migrate_test.go
+++ b/server/app/goauto/migrations/migrate_test.go
@@ -63,7 +63,7 @@ func TestMigrationIsIdempotentAndHasExpectedTables(t *testing.T) {
 		t.Fatalf("second migration: %v", err)
 	}
 	for _, table := range []string{
-		"agent_device", "pdd_product", "collection_rule", "collection_task",
+		"agent_device", "pdd_product", "shopee_product", "syb_product", "collection_rule", "collection_task",
 		"collection_dimension", "collection_dimension_value", "collection_sku", "collection_sku_value",
 	} {
 		if !db.Migrator().HasTable(table) {
@@ -345,7 +345,7 @@ func TestMySQLTextJSONBlobColumnsHaveNoLiteralDefault(t *testing.T) {
 	modelTypes := []any{
 		&models.AgentDevice{}, &models.PDDProduct{}, &models.CollectionRule{}, &models.CollectionTask{},
 		&models.CollectionDimension{}, &models.CollectionDimensionValue{}, &models.CollectionColorPrice{},
-		&models.CollectionSKU{}, &models.CollectionSKUValue{}, &models.ShopeeProduct{},
+		&models.CollectionSKU{}, &models.CollectionSKUValue{}, &models.ShopeeProduct{}, &models.SYBProduct{},
 	}
 	typePattern := regexp.MustCompile(`type:(text|json|blob)`)
 	for _, model := range modelTypes {
diff --git a/server/app/goauto/models/schema.go b/server/app/goauto/models/schema.go
index bb1bf4d..23be433 100644
--- a/server/app/goauto/models/schema.go
+++ b/server/app/goauto/models/schema.go
@@ -283,3 +283,70 @@ func (product *ShopeeProduct) BeforeCreate(_ *gorm.DB) error {
 	}
 	return nil
 }
+
+// Parse status for a SYBProduct's productSpec extraction. See sybimport.Parse.
+const (
+	SYBParseStatusSuccess   = "success"
+	SYBParseStatusUncertain = "uncertain"
+	SYBParseStatusFailed    = "failed"
+)
+
+// SYBProduct is one SYB (顺云宝 ERP) shipment detail line: one order can carry
+// several Shopee product lines, and the same Shopee product can appear more
+// than once within one order at different colors/sizes/quantities — each such
+// line is its own row here (#41). This table never stores purchase task,
+// order or logistics fields; it only records what SYB reported.
+//
+// Uniqueness is the order code plus the source detail id, not a single global
+// id: SYB's detail id shape has only been observed within one order in the
+// available sample data, so a global-uniqueness assumption is unverified.
+type SYBProduct struct {
+	ID uint64 `json:"id" gorm:"primaryKey;autoIncrement"`
+	// OrderCode is the shipment order's `code` (e.g. 260728TB95MJTQ).
+	OrderCode string `json:"orderCode" gorm:"size:64;not null;uniqueIndex:ux_syb_product_order_detail,priority:1"`
+	// DetailID is `details[].id` from SYB, e.g. 145306175.
+	DetailID uint64 `json:"detailId" gorm:"not null;uniqueIndex:ux_syb_product_order_detail,priority:2"`
+	// StockID is the shipment order's own internal id (o.id, e.g. 75104587),
+	// kept for reference when calling back into SYB.
+	StockID  uint64 `json:"stockId" gorm:"not null"`
+	ShopName string `json:"shopName" gorm:"size:255;not null;default:''"`
+
+	// ShopeeItemID is `details[].productId` as a string, matching
+	// shopee_product.shopee_item_id's type. ShopeeProductID links to the
+	// archive once found, revived or created by the import.
+	ShopeeItemID    string  `json:"shopeeItemId" gorm:"size:64;not null;index"`
+	ShopeeProductID *uint64 `json:"shopeeProductId" gorm:"index"`
+	ProductTitle    string  `json:"productTitle" gorm:"size:500;not null;default:''"`
+
+	// TargetColor/TargetSize hold the parser's output. Both stay empty when
+	// ParseStatus is failed; Uncertain may still populate one or both with a
+	// candidate that needs human review (see sybimport.Parse).
+	TargetColor string `json:"targetColor" gorm:"size:255;not null;default:''"`
+	TargetSize  string `json:"targetSize" gorm:"size:255;not null;default:''"`
+	Quantity    int64  `json:"quantity" gorm:"not null;check:ck_syb_product_quantity,quantity >= 1"`
+	// UnitPriceCent is productPrice converted to integer cents, consistent
+	// with the priceCent/salePriceCent convention (#31, #40).
+	UnitPriceCent int64  `json:"unitPriceCent" gorm:"not null;check:ck_syb_product_unit_price,unit_price_cent >= 0"`
+	ImageURL      string `json:"imageUrl" gorm:"type:text;not null"`
+
+	ParseStatus string `json:"parseStatus" gorm:"size:16;not null;index;check:ck_syb_product_parse_status,parse_status IN ('success','uncertain','failed')"`
+	ParseNote   string `json:"parseNote" gorm:"size:500;not null;default:''"`
+
+	// RawJSON is the untouched `details[]` element as SYB returned it. It is
+	// what reparse (#41: "适用于解析规则更新后批量重跑，只读取已保存的原始
+	// JSON，不请求货运宝接口") reads from; it must never be rewritten by a
+	// parse-rule change, only the derived fields above may change.
+	RawJSON string `json:"-" gorm:"type:json;not null"`
+
+	CreatedAt time.Time `json:"createdAt"`
+	UpdatedAt time.Time `json:"updatedAt"`
+}
+
+func (SYBProduct) TableName() string { return "syb_product" }
+
+func (product *SYBProduct) BeforeCreate(_ *gorm.DB) error {
+	if product.RawJSON == "" {
+		product.RawJSON = "{}"
+	}
+	return nil
+}
diff --git a/server/app/goauto/shopeeproduct/service.go b/server/app/goauto/shopeeproduct/service.go
index bd33872..6d1193c 100644
--- a/server/app/goauto/shopeeproduct/service.go
+++ b/server/app/goauto/shopeeproduct/service.go
@@ -582,8 +582,11 @@ func (service *Service) BatchSoftDelete(ctx context.Context, deletedBy uint64, r
 // references this product yet.
 func referencedBy(db *gorm.DB, id uint64) (string, error) {
 	if db.Migrator().HasTable("syb_product") {
+		// syb_product carries no soft delete (#41 defines no such requirement),
+		// so every stored row is live; the deleted_at filter used for
+		// purchase_task below does not apply here.
 		var count int64
-		if err := db.Table("syb_product").Where("shopee_product_id = ? AND deleted_at IS NULL", id).Count(&count).Error; err != nil {
+		if err := db.Table("syb_product").Where("shopee_product_id = ?", id).Count(&count).Error; err != nil {
 			return "", err
 		}
 		if count > 0 {
@@ -631,15 +634,22 @@ func (service *Service) Restore(ctx context.Context, id uint64, request RestoreR
 // per-product selection has nothing real to validate against; a bad config
 // value falls back to fallbackCurrency rather than corrupting new records.
 func (service *Service) resolveCurrency(ctx context.Context) (string, error) {
-	db := service.DB.WithContext(ctx)
+	return ResolveCurrency(ctx, service.DB)
+}
+
+// ResolveCurrency is exported so other units that create a ShopeeProduct
+// directly (#41's import, which is not an admin-API call) apply the exact
+// same system-default-plus-whitelist rule instead of duplicating it.
+func ResolveCurrency(ctx context.Context, db *gorm.DB) (string, error) {
+	scoped := db.WithContext(ctx)
 	// sys_config belongs to the go-admin core schema, not the goauto module
 	// migration; it may be absent in a minimal test database. Its absence is
 	// not an error, just "no override configured".
-	if !db.Migrator().HasTable(&adminmodels.SysConfig{}) {
+	if !scoped.Migrator().HasTable(&adminmodels.SysConfig{}) {
 		return fallbackCurrency, nil
 	}
 	var config adminmodels.SysConfig
-	err := db.Where("config_key = ?", DefaultCurrencyConfigKey).First(&config).Error
+	err := scoped.Where("config_key = ?", DefaultCurrencyConfigKey).First(&config).Error
 	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
 		return "", internalError(err)
 	}
diff --git a/server/app/goauto/shopeeproduct/service_test.go b/server/app/goauto/shopeeproduct/service_test.go
index 355c063..d08197d 100644
--- a/server/app/goauto/shopeeproduct/service_test.go
+++ b/server/app/goauto/shopeeproduct/service_test.go
@@ -385,3 +385,27 @@ func TestResolveCurrencyFallsBackWhenUnconfigured(t *testing.T) {
 		t.Fatalf("expected fallback currency %s, got %s", fallbackCurrency, response.Product.Currency)
 	}
 }
+
+// referencedBy queries syb_product without a deleted_at filter (that table has
+// no soft delete). This is a regression test for a real bug: once #41's
+// migrations.Migrate() registered syb_product, BatchSoftDelete started failing
+// with "no such column: deleted_at" because referencedBy assumed a filter
+// that table does not have.
+func TestBatchSoftDeleteWorksAfterSYBProductTableExists(t *testing.T) {
+	db := openTestDB(t)
+	if !db.Migrator().HasTable("syb_product") {
+		t.Skip("syb_product table not present in this build")
+	}
+	service := NewService(db)
+	created, err := service.Create(context.Background(), CreateRequest{RequestID: uuid.NewString(), ShopeeItemID: "SP-REF"})
+	if err != nil {
+		t.Fatalf("create: %v", err)
+	}
+	results, err := service.BatchSoftDelete(context.Background(), 1, BatchDeleteRequest{RequestID: uuid.NewString(), IDs: []uint64{created.Product.ID}})
+	if err != nil {
+		t.Fatalf("batch delete must not fail once syb_product exists: %v", err)
+	}
+	if results[0].Status != "deleted" {
+		t.Fatalf("expected deleted, got %+v", results[0])
+	}
+}
diff --git a/server/app/goauto/sybimport/apply.go b/server/app/goauto/sybimport/apply.go
new file mode 100644
index 0000000..ed27d0a
--- /dev/null
+++ b/server/app/goauto/sybimport/apply.go
@@ -0,0 +1,296 @@
+package sybimport
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+
+	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/shopeeproduct"
+
+	"gorm.io/gorm"
+)
+
+// OrderInput is the shipment-order-level context a detail line needs. It is
+// deliberately a small, already-decoded struct rather than the raw SYB JSON:
+// this package never talks to SYB's API directly (no credentials or endpoint
+// exist in this repo yet — see the package doc), so callers decode SYB's
+// response themselves and hand in only what a detail line requires.
+type OrderInput struct {
+	Code     string // SYB stock/list `code`, e.g. 260728TB95MJTQ
+	StockID  uint64 // SYB stock/list internal `id`, e.g. 75104587
+	ShopName string
+}
+
+// DetailInput mirrors one element of SYB's `details[]` array from
+// /am/stock/detail/listByStock. ProductPrice is that endpoint's decimal
+// yuan/dollar value (e.g. 239.0), not the ×100 integer used by
+// /am/stock/list's amtOrder — the two endpoints use different units for
+// superficially similar-looking amounts, confirmed against real samples, and
+// must not share one conversion path.
+type DetailInput struct {
+	ID           uint64
+	ProductID    uint64
+	ProductQty   int64
+	ProductPrice float64
+	ProductSpec  string
+	ProductTitle string
+	ProductThumb uint64
+	Raw          json.RawMessage
+}
+
+// ApplyResult reports what ApplyDetail actually did, for the import-result
+// page's per-line feedback (#41 prototype: 新增/覆盖/跳过统计).
+type ApplyResult struct {
+	SYBProduct    models.SYBProduct
+	Outcome       string // created | updated
+	ShopeeOutcome string // linked_existing | revived | created_minimal | not_linked
+	ShopeeProduct *models.ShopeeProduct
+	// ShopeeSpecs is ShopeeProduct.SpecsJSON already decoded, since every
+	// caller that inspects the merge result needs it and decoding it once
+	// here avoids repeating shopeeproduct.Unmarshal at each call site.
+	ShopeeSpecs []shopeeproduct.SpecDimension
+}
+
+const (
+	OutcomeCreated = "created"
+	OutcomeUpdated = "updated"
+
+	ShopeeOutcomeLinkedExisting = "linked_existing"
+	ShopeeOutcomeRevived        = "revived"
+	ShopeeOutcomeCreatedMinimal = "created_minimal"
+	ShopeeOutcomeNotLinked      = "not_linked"
+)
+
+// ApplyDetail upserts one SYB detail line and folds it into the shared
+// shopee_product archive. It is idempotent on (order_code, detail_id): a
+// second call with the same order+detail overwrites the same row rather than
+// creating a duplicate (#41: 重复导入相同来源明细执行覆盖/更新，不产生重复记录).
+//
+// It never creates purchase tasks and never writes any order/logistics field.
+func ApplyDetail(ctx context.Context, db *gorm.DB, order OrderInput, detail DetailInput) (ApplyResult, error) {
+	if strings.TrimSpace(order.Code) == "" {
+		return ApplyResult{}, fmt.Errorf("order code is required")
+	}
+	if detail.ID == 0 {
+		return ApplyResult{}, fmt.Errorf("detail id is required")
+	}
+	if detail.ProductQty < 1 {
+		return ApplyResult{}, fmt.Errorf("detail %d: productQty must be at least 1, source values are never split into orders of zero", detail.ID)
+	}
+
+	parsed := Parse(detail.ProductSpec)
+	rawJSON, err := normalizeRaw(detail.Raw)
+	if err != nil {
+		return ApplyResult{}, err
+	}
+
+	var result ApplyResult
+	txErr := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		shopeeItemID := strconv.FormatUint(detail.ProductID, 10)
+		shopeeProduct, shopeeOutcome, err := findOrCreateShopeeProduct(ctx, tx, shopeeItemID, order, detail)
+		if err != nil {
+			return err
+		}
+		if parsed.Status == models.SYBParseStatusSuccess && shopeeProduct != nil {
+			if err := mergeParsedSpec(tx, shopeeProduct.ID, parsed); err != nil {
+				return err
+			}
+			// mergeParsedSpec writes specs_json through its own query and does
+			// not touch this pointer's in-memory copy, so the merged value must
+			// be re-read before it is reported back to the caller.
+			if err := tx.First(shopeeProduct, shopeeProduct.ID).Error; err != nil {
+				return err
+			}
+		}
+
+		record := models.SYBProduct{
+			OrderCode: order.Code, DetailID: detail.ID, StockID: order.StockID, ShopName: order.ShopName,
+			ShopeeItemID: shopeeItemID, ProductTitle: detail.ProductTitle,
+			TargetColor: parsed.Color, TargetSize: parsed.Size,
+			Quantity: detail.ProductQty, UnitPriceCent: roundCents(detail.ProductPrice),
+			ImageURL:    buildImageURL(detail.ProductThumb),
+			ParseStatus: parsed.Status, ParseNote: parsed.Note, RawJSON: rawJSON,
+		}
+		if shopeeProduct != nil {
+			record.ShopeeProductID = &shopeeProduct.ID
+		}
+
+		var existing models.SYBProduct
+		err = tx.Where("order_code = ? AND detail_id = ?", order.Code, detail.ID).First(&existing).Error
+		switch {
+		case errors.Is(err, gorm.ErrRecordNotFound):
+			if err := tx.Create(&record).Error; err != nil {
+				return err
+			}
+			result.Outcome = OutcomeCreated
+		case err == nil:
+			record.ID = existing.ID
+			if err := tx.Model(&models.SYBProduct{}).Where("id = ?", existing.ID).Updates(map[string]any{
+				"stock_id": record.StockID, "shop_name": record.ShopName, "shopee_item_id": record.ShopeeItemID,
+				"shopee_product_id": record.ShopeeProductID, "product_title": record.ProductTitle,
+				"target_color": record.TargetColor, "target_size": record.TargetSize,
+				"quantity": record.Quantity, "unit_price_cent": record.UnitPriceCent, "image_url": record.ImageURL,
+				"parse_status": record.ParseStatus, "parse_note": record.ParseNote, "raw_json": record.RawJSON,
+			}).Error; err != nil {
+				return err
+			}
+			result.Outcome = OutcomeUpdated
+		default:
+			return err
+		}
+		result.SYBProduct = record
+		result.ShopeeOutcome = shopeeOutcome
+		result.ShopeeProduct = shopeeProduct
+		if shopeeProduct != nil {
+			specs, err := shopeeproduct.Unmarshal(shopeeProduct.SpecsJSON)
+			if err != nil {
+				return err
+			}
+			result.ShopeeSpecs = specs
+		}
+		return nil
+	})
+	if txErr != nil {
+		return ApplyResult{}, txErr
+	}
+	return result, nil
+}
+
+// findOrCreateShopeeProduct implements #40's revival rule: a live match wins,
+// a soft-deleted match is revived (keeping its prior mapping), and only when
+// neither exists does the import create a minimal archive. On an existing
+// record — live or revived — only empty image/price fields are filled in;
+// title, shop name and mappings that a human already edited are never
+// overwritten (#40: 命中既有档案时，只补写为空的参考图与售价).
+func findOrCreateShopeeProduct(ctx context.Context, tx *gorm.DB, shopeeItemID string, order OrderInput, detail DetailInput) (*models.ShopeeProduct, string, error) {
+	var live models.ShopeeProduct
+	err := tx.Where("shopee_item_id = ?", shopeeItemID).First(&live).Error
+	if err == nil {
+		if err := fillEmptyArchiveFields(tx, &live, detail); err != nil {
+			return nil, "", err
+		}
+		return &live, ShopeeOutcomeLinkedExisting, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, "", err
+	}
+
+	var deleted models.ShopeeProduct
+	err = tx.Unscoped().Where("shopee_item_id = ? AND deleted_at IS NOT NULL", shopeeItemID).
+		Order("deleted_at DESC").First(&deleted).Error
+	if err == nil {
+		if _, err := shopeeproduct.Revive(tx, deleted.ID); err != nil {
+			return nil, "", err
+		}
+		if err := tx.First(&deleted, deleted.ID).Error; err != nil {
+			return nil, "", err
+		}
+		if err := fillEmptyArchiveFields(tx, &deleted, detail); err != nil {
+			return nil, "", err
+		}
+		return &deleted, ShopeeOutcomeRevived, nil
+	}
+	if !errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, "", err
+	}
+
+	currency, err := shopeeproduct.ResolveCurrency(ctx, tx)
+	if err != nil {
+		return nil, "", err
+	}
+	created := models.ShopeeProduct{
+		ShopeeItemID: shopeeItemID, Title: strings.TrimSpace(detail.ProductTitle), ShopName: strings.TrimSpace(order.ShopName),
+		ImageURL: buildImageURL(detail.ProductThumb), Currency: currency, SpecsJSON: "[]",
+	}
+	price := roundCents(detail.ProductPrice)
+	created.SalePriceCent = &price
+	if err := tx.Create(&created).Error; err != nil {
+		return nil, "", err
+	}
+	return &created, ShopeeOutcomeCreatedMinimal, nil
+}
+
+func fillEmptyArchiveFields(tx *gorm.DB, product *models.ShopeeProduct, detail DetailInput) error {
+	updates := map[string]any{}
+	if product.ImageURL == "" {
+		url := buildImageURL(detail.ProductThumb)
+		updates["image_url"] = url
+		product.ImageURL = url
+	}
+	if product.SalePriceCent == nil {
+		price := roundCents(detail.ProductPrice)
+		updates["sale_price_cent"] = price
+		product.SalePriceCent = &price
+	}
+	if len(updates) == 0 {
+		return nil
+	}
+	return tx.Model(&models.ShopeeProduct{}).Where("id = ?", product.ID).Updates(updates).Error
+}
+
+// mergeParsedSpec folds a successfully parsed color/size into the archive as
+// import-sourced spec values (#40: 虾皮规格值...或由 #41 SYB 明细导入写入；
+// 每个规格值保存来源标记). Only a clean, unambiguous parse reaches here —
+// uncertain and failed parses are recorded on the SYB detail row for human
+// review but are never pushed into the shared archive, so a messy raw string
+// never pollutes the spec list other screens read from.
+func mergeParsedSpec(tx *gorm.DB, shopeeProductID uint64, parsed ParseResult) error {
+	var product models.ShopeeProduct
+	if err := tx.First(&product, shopeeProductID).Error; err != nil {
+		return err
+	}
+	existing, err := shopeeproduct.Unmarshal(product.SpecsJSON)
+	if err != nil {
+		return err
+	}
+	incoming := []shopeeproduct.SpecDimension{}
+	if parsed.Color != "" {
+		incoming = append(incoming, shopeeproduct.SpecDimension{Name: "颜色", Role: shopeeproduct.RoleColor, Values: []shopeeproduct.SpecValue{{Name: parsed.Color, Source: shopeeproduct.ValueSourceImport}}})
+	}
+	if parsed.Size != "" {
+		incoming = append(incoming, shopeeproduct.SpecDimension{Name: "尺码", Role: shopeeproduct.RoleSize, Values: []shopeeproduct.SpecValue{{Name: parsed.Size, Source: shopeeproduct.ValueSourceImport}}})
+	}
+	if len(incoming) == 0 {
+		return nil
+	}
+	merged := shopeeproduct.Merge(existing, incoming)
+	if err := shopeeproduct.Validate(merged); err != nil {
+		return err
+	}
+	specsJSON, err := shopeeproduct.Marshal(merged)
+	if err != nil {
+		return err
+	}
+	return tx.Model(&models.ShopeeProduct{}).Where("id = ?", shopeeProductID).Update("specs_json", specsJSON).Error
+}
+
+// buildImageURL mirrors the rule confirmed against real SYB responses and
+// already applied in #40: the thumbnail id is not a URL by itself.
+func buildImageURL(productThumb uint64) string {
+	if productThumb == 0 {
+		return ""
+	}
+	return fmt.Sprintf("https://www.shunyunbaoerp.com/api/p/file?id=%d", productThumb)
+}
+
+func roundCents(amount float64) int64 {
+	if amount < 0 {
+		return 0
+	}
+	return int64(math.Round(amount * 100))
+}
+
+func normalizeRaw(raw json.RawMessage) (string, error) {
+	if len(raw) == 0 {
+		return "{}", nil
+	}
+	if !json.Valid(raw) {
+		return "", fmt.Errorf("raw detail payload is not valid JSON")
+	}
+	return string(raw), nil
+}
diff --git a/server/app/goauto/sybimport/apply_test.go b/server/app/goauto/sybimport/apply_test.go
new file mode 100644
index 0000000..7073be1
--- /dev/null
+++ b/server/app/goauto/sybimport/apply_test.go
@@ -0,0 +1,336 @@
+package sybimport_test
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"testing"
+
+	"go-admin/app/goauto/migrations"
+	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/shopeeproduct"
+	"go-admin/app/goauto/sybimport"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func openTestDB(t *testing.T) *gorm.DB {
+	t.Helper()
+	db, err := gorm.Open(sqlite.Open(fmt.Sprintf("file:%s?mode=memory&cache=shared&_foreign_keys=on", strings.ReplaceAll(t.Name(), "/", "_"))), &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)})
+	if err != nil {
+		t.Fatalf("open database: %v", err)
+	}
+	if err := migrations.Migrate(db); err != nil {
+		t.Fatalf("migrate: %v", err)
+	}
+	return db
+}
+
+// realOrder returns the actual order-level context from
+// demo/shunyunbaoerp_stock_list.har order 260728TB95MJTQ (stock id 75104587).
+func realOrder() sybimport.OrderInput {
+	return sybimport.OrderInput{Code: "260728TB95MJTQ", StockID: 75104587, ShopName: "韓舍佳人女裝店"}
+}
+
+// realDetailA/B are the two actual details[] entries from the same order,
+// copied verbatim (not fabricated) from the HAR capture used throughout #41.
+func realDetailA() sybimport.DetailInput {
+	return sybimport.DetailInput{
+		ID: 145306175, ProductID: 50209124255, ProductQty: 1, ProductPrice: 239.0,
+		ProductSpec:  "白色,L【建議50-60公斤】",
+		ProductTitle: "蕾絲花邊拼接背心女 上衣 背心 無袖打底衫  大碼設計感蕾絲花邊拼接背心女春夏新款胖mm寬鬆顯瘦外穿無袖上衣女裝",
+		ProductThumb: 190639637,
+		Raw:          json.RawMessage(`{"id":145306175,"productQty":1,"productPrice":239.0,"productThumb":190639637,"productTitle":"蕾絲花邊拼接背心女","productSpec":"白色,L【建議50-60公斤】","sku":"","variationSku":"","purchaseStatus":0,"purchaseCode":"","pruchaseId":38884195,"productId":50209124255}`),
+	}
+}
+
+func realDetailB() sybimport.DetailInput {
+	return sybimport.DetailInput{
+		ID: 145306176, ProductID: 50712076553, ProductQty: 1, ProductPrice: 439.0,
+		ProductSpec:  "黑色+白色【純棉兩件裝】 簡約親膚,L【建議52.5-60公斤】",
+		ProductTitle: "不規則T恤女 上衣 T恤 短袖衫 韓系服飾 夏季百搭拼接不規則蕾絲下襬t恤衫女減齡修身短袖純棉上衣",
+		ProductThumb: 190639638,
+		Raw:          json.RawMessage(`{"id":145306176,"productQty":1,"productPrice":439.0,"productThumb":190639638,"productTitle":"不規則T恤女","productSpec":"黑色+白色【純棉兩件裝】 簡約親膚,L【建議52.5-60公斤】","sku":"","variationSku":"","purchaseStatus":0,"purchaseCode":"","pruchaseId":38884196,"productId":50712076553}`),
+	}
+}
+
+// ---------------------------------------------------------------- basic apply
+
+func TestApplyDetailCreatesRowWithConvertedPriceAndImageURL(t *testing.T) {
+	db := openTestDB(t)
+	result, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), realDetailA())
+	if err != nil {
+		t.Fatalf("apply: %v", err)
+	}
+	if result.Outcome != sybimport.OutcomeCreated {
+		t.Fatalf("expected created, got %s", result.Outcome)
+	}
+	// productPrice 239.0 (decimal yuan/dollar from /detail/listByStock) must
+	// become 23900 cents, NOT reuse the ×100-different unit seen on
+	// /am/stock/list's amtOrder for the same order.
+	if result.SYBProduct.UnitPriceCent != 23900 {
+		t.Fatalf("expected 23900 cents, got %d", result.SYBProduct.UnitPriceCent)
+	}
+	if result.SYBProduct.ImageURL != "https://www.shunyunbaoerp.com/api/p/file?id=190639637" {
+		t.Fatalf("unexpected image url: %s", result.SYBProduct.ImageURL)
+	}
+	if result.SYBProduct.TargetColor != "白色" || result.SYBProduct.TargetSize != "L" {
+		t.Fatalf("expected clean parse 白色/L, got %q/%q", result.SYBProduct.TargetColor, result.SYBProduct.TargetSize)
+	}
+	if result.SYBProduct.ParseStatus != models.SYBParseStatusSuccess {
+		t.Fatalf("expected success, got %s", result.SYBProduct.ParseStatus)
+	}
+}
+
+func TestApplyDetailRejectsQuantityBelowOne(t *testing.T) {
+	db := openTestDB(t)
+	detail := realDetailA()
+	detail.ProductQty = 0
+	if _, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), detail); err == nil {
+		t.Fatal("expected error for productQty < 1")
+	}
+}
+
+// #41: 数量1到N按来源值结构化保存，不在导入阶段拆单.
+func TestApplyDetailKeepsMultiUnitQuantityAsOneRow(t *testing.T) {
+	db := openTestDB(t)
+	detail := realDetailA()
+	detail.ID = 999001
+	detail.ProductQty = 5
+	result, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), detail)
+	if err != nil {
+		t.Fatalf("apply: %v", err)
+	}
+	if result.SYBProduct.Quantity != 5 {
+		t.Fatalf("expected quantity 5 preserved as one row, got %d", result.SYBProduct.Quantity)
+	}
+	var count int64
+	db.Model(&models.SYBProduct{}).Where("order_code = ? AND detail_id = ?", "260728TB95MJTQ", 999001).Count(&count)
+	if count != 1 {
+		t.Fatalf("expected exactly one row for this detail line, got %d", count)
+	}
+}
+
+// ---------------------------------------------------------------- 幂等 / 覆盖
+
+// #41: 重复导入相同来源明细执行覆盖/更新，不产生重复记录.
+func TestApplyDetailIsIdempotentOnOrderCodeAndDetailID(t *testing.T) {
+	db := openTestDB(t)
+	order, detail := realOrder(), realDetailA()
+	first, err := sybimport.ApplyDetail(context.Background(), db, order, detail)
+	if err != nil {
+		t.Fatalf("first apply: %v", err)
+	}
+	detail.ProductQty = 2 // simulate the source value changing between imports
+	second, err := sybimport.ApplyDetail(context.Background(), db, order, detail)
+	if err != nil {
+		t.Fatalf("second apply: %v", err)
+	}
+	if second.Outcome != sybimport.OutcomeUpdated {
+		t.Fatalf("expected updated, got %s", second.Outcome)
+	}
+	if second.SYBProduct.ID != first.SYBProduct.ID {
+		t.Fatal("re-import must update the same row, not create a new one")
+	}
+	var count int64
+	db.Model(&models.SYBProduct{}).Where("order_code = ? AND detail_id = ?", order.Code, detail.ID).Count(&count)
+	if count != 1 {
+		t.Fatalf("expected exactly 1 row after re-import, got %d", count)
+	}
+}
+
+// 同一货运单中同一虾皮商品的多组颜色尺码必须保存为独立明细，不能被幂等键误合并.
+func TestSameShopeeProductDifferentDetailIDsStayIndependentRows(t *testing.T) {
+	db := openTestDB(t)
+	order := realOrder()
+	a := realDetailA()
+	b := realDetailA()
+	b.ID = 145306180
+	b.ProductSpec = "白色,XL"
+	if _, err := sybimport.ApplyDetail(context.Background(), db, order, a); err != nil {
+		t.Fatalf("apply a: %v", err)
+	}
+	if _, err := sybimport.ApplyDetail(context.Background(), db, order, b); err != nil {
+		t.Fatalf("apply b: %v", err)
+	}
+	var count int64
+	db.Model(&models.SYBProduct{}).Where("shopee_item_id = ?", "50209124255").Count(&count)
+	if count != 2 {
+		t.Fatalf("expected 2 independent detail rows for the same shopee item, got %d", count)
+	}
+}
+
+// ---------------------------------------------------------------- shopee 关联
+
+func TestApplyDetailCreatesMinimalShopeeArchiveWhenMissing(t *testing.T) {
+	db := openTestDB(t)
+	result, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), realDetailA())
+	if err != nil {
+		t.Fatalf("apply: %v", err)
+	}
+	if result.ShopeeOutcome != sybimport.ShopeeOutcomeCreatedMinimal {
+		t.Fatalf("expected created_minimal, got %s", result.ShopeeOutcome)
+	}
+	if result.ShopeeProduct.ShopeeItemID != "50209124255" {
+		t.Fatalf("unexpected shopee item id: %s", result.ShopeeProduct.ShopeeItemID)
+	}
+	if result.SYBProduct.ShopeeProductID == nil || *result.SYBProduct.ShopeeProductID != result.ShopeeProduct.ID {
+		t.Fatal("syb row must link to the created shopee product")
+	}
+}
+
+// 重复导入不得重复创建虾皮商品档案.
+func TestApplyDetailDoesNotDuplicateShopeeArchiveOnReimport(t *testing.T) {
+	db := openTestDB(t)
+	order, detail := realOrder(), realDetailA()
+	if _, err := sybimport.ApplyDetail(context.Background(), db, order, detail); err != nil {
+		t.Fatalf("first: %v", err)
+	}
+	second, err := sybimport.ApplyDetail(context.Background(), db, order, detail)
+	if err != nil {
+		t.Fatalf("second: %v", err)
+	}
+	if second.ShopeeOutcome != sybimport.ShopeeOutcomeLinkedExisting {
+		t.Fatalf("expected linked_existing on reimport, got %s", second.ShopeeOutcome)
+	}
+	var count int64
+	db.Model(&models.ShopeeProduct{}).Where("shopee_item_id = ?", "50209124255").Count(&count)
+	if count != 1 {
+		t.Fatalf("expected exactly 1 shopee product, got %d", count)
+	}
+}
+
+// #40: 已软删除的 shopee_item_id 被 #41 重复导入命中时，清空 deleted_at 复活原
+// 记录并保留其人工映射.
+func TestApplyDetailRevivesSoftDeletedShopeeArchiveAndKeepsMapping(t *testing.T) {
+	db := openTestDB(t)
+	shopeeSvc := newTestShopeeService(db)
+	created, err := shopeeSvc.Create(context.Background(), shopeeCreateRequest("50209124255"))
+	if err != nil {
+		t.Fatalf("seed shopee product: %v", err)
+	}
+	if _, err := deleteShopeeProduct(db, created.Product.ID, 1); err != nil {
+		t.Fatalf("soft delete: %v", err)
+	}
+
+	result, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), realDetailA())
+	if err != nil {
+		t.Fatalf("apply after soft delete: %v", err)
+	}
+	if result.ShopeeOutcome != sybimport.ShopeeOutcomeRevived {
+		t.Fatalf("expected revived, got %s", result.ShopeeOutcome)
+	}
+	if result.ShopeeProduct.ID != created.Product.ID {
+		t.Fatal("revival must reuse the original row, not create a new one")
+	}
+	if result.ShopeeProduct.Title != "人工维护的标题" {
+		t.Fatalf("revival must not overwrite a human-edited title, got %q", result.ShopeeProduct.Title)
+	}
+}
+
+// #40: 命中既有档案时，只补写为空的参考图与售价，不覆盖人工修改过的标题、店铺
+// 和规格映射.
+func TestApplyDetailNeverOverwritesHumanEditedTitleOnExistingArchive(t *testing.T) {
+	db := openTestDB(t)
+	shopeeSvc := newTestShopeeService(db)
+	if _, err := shopeeSvc.Create(context.Background(), shopeeCreateRequest("50209124255")); err != nil {
+		t.Fatalf("seed: %v", err)
+	}
+	result, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), realDetailA())
+	if err != nil {
+		t.Fatalf("apply: %v", err)
+	}
+	if result.ShopeeProduct.Title != "人工维护的标题" {
+		t.Fatalf("existing human-edited title must survive import, got %q", result.ShopeeProduct.Title)
+	}
+}
+
+// ---------------------------------------------------------------- 规格合并
+
+// 只有解析成功（success）才写入虾皮商品档案的规格值；存疑/失败的候选只留在
+// SYB 明细上供人工复核，不污染共享档案。
+func TestApplyDetailOnlyMergesSuccessfullyParsedSpecIntoArchive(t *testing.T) {
+	db := openTestDB(t)
+	clean, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), realDetailA())
+	if err != nil {
+		t.Fatalf("apply clean: %v", err)
+	}
+	if len(clean.ShopeeSpecs) == 0 {
+		t.Fatal("a successfully parsed color/size should be merged into the archive")
+	}
+
+	ambiguous := realDetailB()
+	result, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), ambiguous)
+	if err != nil {
+		t.Fatalf("apply ambiguous: %v", err)
+	}
+	if result.SYBProduct.ParseStatus != models.SYBParseStatusUncertain {
+		t.Fatalf("expected uncertain for the ambiguous sample, got %s", result.SYBProduct.ParseStatus)
+	}
+	if len(result.ShopeeSpecs) != 0 {
+		t.Fatalf("an uncertain parse must not be pushed into the shared archive, got %+v", result.ShopeeSpecs)
+	}
+}
+
+func TestApplyDetailMergeIsIdempotentAcrossReimports(t *testing.T) {
+	db := openTestDB(t)
+	order, detail := realOrder(), realDetailA()
+	if _, err := sybimport.ApplyDetail(context.Background(), db, order, detail); err != nil {
+		t.Fatalf("first: %v", err)
+	}
+	result, err := sybimport.ApplyDetail(context.Background(), db, order, detail)
+	if err != nil {
+		t.Fatalf("second: %v", err)
+	}
+	colorValues := 0
+	for _, dimension := range result.ShopeeSpecs {
+		if dimension.Role == "color" {
+			colorValues = len(dimension.Values)
+		}
+	}
+	if colorValues != 1 {
+		t.Fatalf("re-importing the same detail must not duplicate the merged spec value, got %d color values", colorValues)
+	}
+}
+
+// ---------------------------------------------------------------- 边界
+
+func TestApplyDetailRejectsInvalidRawJSON(t *testing.T) {
+	db := openTestDB(t)
+	detail := realDetailA()
+	detail.Raw = json.RawMessage(`{not valid`)
+	if _, err := sybimport.ApplyDetail(context.Background(), db, realOrder(), detail); err == nil {
+		t.Fatal("expected error for invalid raw JSON")
+	}
+}
+
+func TestApplyDetailRejectsMissingOrderCode(t *testing.T) {
+	db := openTestDB(t)
+	order := realOrder()
+	order.Code = ""
+	if _, err := sybimport.ApplyDetail(context.Background(), db, order, realDetailA()); err == nil {
+		t.Fatal("expected error for empty order code")
+	}
+}
+
+// ---------------------------------------------------------------- test helpers
+
+func newTestShopeeService(db *gorm.DB) *shopeeproduct.Service { return shopeeproduct.NewService(db) }
+
+func shopeeCreateRequest(shopeeItemID string) shopeeproduct.CreateRequest {
+	return shopeeproduct.CreateRequest{RequestID: newUUID(), ShopeeItemID: shopeeItemID, Title: "人工维护的标题", ShopName: "人工维护的店铺"}
+}
+
+func deleteShopeeProduct(db *gorm.DB, id uint64, deletedBy uint64) (int64, error) {
+	return shopeeproduct.SoftDelete(db, id, deletedBy)
+}
+
+var uuidCounter int
+
+func newUUID() string {
+	uuidCounter++
+	return fmt.Sprintf("00000000-0000-0000-0000-%012d", uuidCounter)
+}
diff --git a/server/app/goauto/sybimport/parse.go b/server/app/goauto/sybimport/parse.go
new file mode 100644
index 0000000..d7b4ffc
--- /dev/null
+++ b/server/app/goauto/sybimport/parse.go
@@ -0,0 +1,82 @@
+// Package sybimport owns the SYB (顺云宝 ERP) shipment detail import: parsing
+// productSpec into color/size, and folding each detail into the independent
+// syb_product table and the shared shopee_product archive. It never creates
+// purchase tasks or stores order/logistics fields (#41).
+package sybimport
+
+import (
+	"regexp"
+	"strings"
+
+	"go-admin/app/goauto/models"
+)
+
+var bracketPattern = regexp.MustCompile(`【[^】]*】`)
+
+// ambiguousPattern flags leftover separators or multi-token noise after
+// bracket stripping — the signal that a "clean" split still isn't reliable.
+// Observed in the real SYB sample: "黑色+白色【純棉兩件裝】 簡約親膚" strips
+// its bracket to "黑色+白色 簡約親膚", which still carries a '+' and internal
+// whitespace, so it must not be reported as a confident match.
+var ambiguousPattern = regexp.MustCompile(`[+＋\s]`)
+
+// ParseResult is the color/size candidate extracted from one productSpec
+// string, plus how much the caller should trust it.
+type ParseResult struct {
+	Color  string
+	Size   string
+	Status string
+	Note   string
+}
+
+// Parse implements the #41 rule: split on the last comma into color/size,
+// strip 【...】 annotations, and classify the result. It never guesses a
+// missing value and never invents a color or size that is not literally
+// present in the input.
+//
+// Rules, derived from real SYB samples (demo/shunyunbaoerp_stock_list.har)
+// plus the boundary cases already confirmed in the #41 prototype:
+//   - empty/whitespace-only input -> failed, nothing to extract.
+//   - no comma present (e.g. "均碼") -> uncertain: the whole string, with
+//     brackets stripped, becomes the size candidate; color stays empty. A
+//     single token with no separator cannot be split into two dimensions
+//     without guessing which one it is.
+//   - comma present, last segment (size) and first segment(s) (color) both
+//     non-empty after stripping brackets, and the color candidate has no
+//     leftover separator/whitespace -> success.
+//   - comma present but either side is empty after stripping, or the color
+//     candidate still carries a leftover '+' or internal whitespace -> the
+//     split happened but is not trustworthy -> uncertain.
+func Parse(raw string) ParseResult {
+	trimmed := strings.TrimSpace(raw)
+	if trimmed == "" {
+		return ParseResult{Status: models.SYBParseStatusFailed, Note: "productSpec 为空，无法拆分颜色尺码"}
+	}
+
+	lastComma := strings.LastIndex(trimmed, ",")
+	// SYB samples use the ASCII comma; a full-width Chinese comma has not been
+	// observed, so it is deliberately not treated as a separator here rather
+	// than guessed at.
+	if lastComma < 0 {
+		size := stripBrackets(trimmed)
+		if size == "" {
+			return ParseResult{Status: models.SYBParseStatusFailed, Note: "productSpec 剥离备注后为空"}
+		}
+		return ParseResult{Size: size, Status: models.SYBParseStatusUncertain, Note: "无分隔符，仅识别出单一规格值"}
+	}
+
+	colorPart := stripBrackets(trimmed[:lastComma])
+	sizePart := stripBrackets(trimmed[lastComma+1:])
+
+	if colorPart == "" || sizePart == "" {
+		return ParseResult{Color: colorPart, Size: sizePart, Status: models.SYBParseStatusUncertain, Note: "按逗号拆分后有一侧为空"}
+	}
+	if ambiguousPattern.MatchString(colorPart) {
+		return ParseResult{Color: colorPart, Size: sizePart, Status: models.SYBParseStatusUncertain, Note: "颜色部分含备注文本或多个分隔符，拆分结果可能不准确"}
+	}
+	return ParseResult{Color: colorPart, Size: sizePart, Status: models.SYBParseStatusSuccess}
+}
+
+func stripBrackets(part string) string {
+	return strings.TrimSpace(bracketPattern.ReplaceAllString(part, ""))
+}
diff --git a/server/app/goauto/sybimport/parse_test.go b/server/app/goauto/sybimport/parse_test.go
new file mode 100644
index 0000000..ab22d6f
--- /dev/null
+++ b/server/app/goauto/sybimport/parse_test.go
@@ -0,0 +1,81 @@
+package sybimport_test
+
+import (
+	"testing"
+
+	"go-admin/app/goauto/models"
+	"go-admin/app/goauto/sybimport"
+)
+
+// Real samples from demo/shunyunbaoerp_stock_list.har (details[145306175],
+// details[145306176]), not fabricated fixtures.
+func TestParseRealSample_CleanColorAndSize(t *testing.T) {
+	result := sybimport.Parse("白色,L【建議50-60公斤】")
+	if result.Status != models.SYBParseStatusSuccess {
+		t.Fatalf("expected success, got %s (%s)", result.Status, result.Note)
+	}
+	if result.Color != "白色" || result.Size != "L" {
+		t.Fatalf("expected 白色/L, got %q/%q", result.Color, result.Size)
+	}
+}
+
+func TestParseRealSample_AmbiguousColorWithAnnotationAndSeparator(t *testing.T) {
+	result := sybimport.Parse("黑色+白色【純棉兩件裝】 簡約親膚,L【建議52.5-60公斤】")
+	if result.Status != models.SYBParseStatusUncertain {
+		t.Fatalf("expected uncertain, got %s", result.Status)
+	}
+	if result.Size != "L" {
+		t.Fatalf("size should still parse cleanly, got %q", result.Size)
+	}
+	if result.Color == "" {
+		t.Fatal("color candidate should still be reported for human review, not discarded")
+	}
+}
+
+func TestParseEmptyInputFails(t *testing.T) {
+	result := sybimport.Parse("   ")
+	if result.Status != models.SYBParseStatusFailed {
+		t.Fatalf("expected failed, got %s", result.Status)
+	}
+	if result.Color != "" || result.Size != "" {
+		t.Fatal("failed parse must not invent a color or size")
+	}
+}
+
+func TestParseNoSeparatorIsUncertainNotFailed(t *testing.T) {
+	result := sybimport.Parse("均碼")
+	if result.Status != models.SYBParseStatusUncertain {
+		t.Fatalf("expected uncertain (not failed) for a single token, got %s", result.Status)
+	}
+	if result.Size != "均碼" || result.Color != "" {
+		t.Fatalf("single token should become the size candidate only, got color=%q size=%q", result.Color, result.Size)
+	}
+}
+
+func TestParseNeverInventsAColorOrSizeNotInInput(t *testing.T) {
+	for _, raw := range []string{"", "   ", "均碼", "白色,L", "黑色+白色 备注,L"} {
+		result := sybimport.Parse(raw)
+		if result.Color != "" && !containsSubstring(raw, result.Color) {
+			t.Fatalf("Parse(%q) invented color %q not present in input", raw, result.Color)
+		}
+		if result.Size != "" && !containsSubstring(raw, result.Size) {
+			t.Fatalf("Parse(%q) invented size %q not present in input", raw, result.Size)
+		}
+	}
+}
+
+func containsSubstring(haystack, needle string) bool {
+	for i := 0; i+len(needle) <= len(haystack); i++ {
+		if haystack[i:i+len(needle)] == needle {
+			return true
+		}
+	}
+	return false
+}
+
+func TestParseBothSidesEmptyAfterStrippingIsUncertain(t *testing.T) {
+	result := sybimport.Parse("【備註】,【備註】")
+	if result.Status != models.SYBParseStatusUncertain {
+		t.Fatalf("expected uncertain when both sides strip to empty, got %s", result.Status)
+	}
+}