diff --git a/admin/repository/mapping.go b/admin/repository/mapping.go
index 8dcff59..0eb6621 100644
--- a/admin/repository/mapping.go
+++ b/admin/repository/mapping.go
@@ -77,7 +77,14 @@ func UpsertSpecMapping(q Execer, m model.SpecMapping) error {
 // UpsertAutomaticSpecMapping 只在没有人工映射且上下文版本变化时写入自动结果。
 // 同一上下文的并发 AI 请求由先写入者获胜；人工保存无论先后都不会被自动结果覆盖。
 func UpsertAutomaticSpecMapping(q Execer, m model.SpecMapping) error {
-	_, err := q.Exec(`
+	_, err := UpsertAutomaticSpecMappingChanged(q, m)
+	return err
+}
+
+// UpsertAutomaticSpecMappingChanged 与 UpsertAutomaticSpecMapping 使用同一条并发安全 SQL，
+// 并返回本次是否真正插入或更新。调用方据此避免为幂等重放重复追加决策审计。
+func UpsertAutomaticSpecMappingChanged(q Execer, m model.SpecMapping) (bool, error) {
+	result, err := q.Exec(`
 		INSERT INTO spec_mappings
 		       (shopee_goods_id,spec_key,pdd_goods_id,pdd_option_key,pdd_options,spec_raw,
 		        mapped_at,mapped_by,source,source_provider_id,source_model,confidence_bps,
@@ -101,9 +108,30 @@ func UpsertAutomaticSpecMapping(q Execer, m model.SpecMapping) error {
 		nullableText(m.SourceModel), nullableInt(m.ConfidenceBPS, m.ConfidenceSet), nullableText(m.SourceReason),
 		nullableText(m.SourceVersion), nullableText(m.ContextVersion))
 	if err != nil {
-		return fmt.Errorf("保存自动规格映射失败: %w", err)
+		return false, fmt.Errorf("保存自动规格映射失败: %w", err)
 	}
-	return nil
+	rows, err := result.RowsAffected()
+	if err != nil {
+		return false, fmt.Errorf("读取自动规格映射保存结果失败: %w", err)
+	}
+	return rows > 0, nil
+}
+
+// DeleteAutomaticSpecMappingByVersion 只删除指定规则自己生成的映射。
+// 人工和 AI 结果以及其他规则版本永远不受影响。
+func DeleteAutomaticSpecMappingByVersion(q Execer, shopeeGoodsID, specKey, pddGoodsID, sourceVersion string) (bool, error) {
+	result, err := q.Exec(`DELETE FROM spec_mappings
+		WHERE shopee_goods_id=? AND spec_key=? AND pdd_goods_id=?
+		  AND source='rule' AND source_version=?`,
+		shopeeGoodsID, specKey, pddGoodsID, sourceVersion)
+	if err != nil {
+		return false, fmt.Errorf("清除失效的颜色辅助规格映射失败: %w", err)
+	}
+	rows, err := result.RowsAffected()
+	if err != nil {
+		return false, fmt.Errorf("读取颜色辅助规格映射清除结果失败: %w", err)
+	}
+	return rows > 0, nil
 }
 
 func InsertAISpecMatchDecision(q Execer, d model.AISpecMatchDecision) error {
diff --git a/admin/repository/shopee.go b/admin/repository/shopee.go
index 563f340..0e03bbe 100644
--- a/admin/repository/shopee.go
+++ b/admin/repository/shopee.go
@@ -332,6 +332,25 @@ func ListShopeePddLinksByGoodsIDs(q Execer, goodsIDs []string) (map[string]strin
 	return links, nil
 }
 
+// ListShopeeGoodsIDsByPddGoodsID 返回当前仍关联指定 PDD 商品的蝦皮商品。
+func ListShopeeGoodsIDsByPddGoodsID(q Execer, pddGoodsID string) ([]string, error) {
+	rows, err := q.Query(`SELECT goods_id FROM shopee_products
+		WHERE pdd_goods_id=? AND deleted_at IS NULL ORDER BY goods_id`, pddGoodsID)
+	if err != nil {
+		return nil, fmt.Errorf("查询 PDD 商品 %s 的蝦皮关联失败: %w", pddGoodsID, err)
+	}
+	defer rows.Close()
+	var result []string
+	for rows.Next() {
+		var goodsID string
+		if err := rows.Scan(&goodsID); err != nil {
+			return nil, fmt.Errorf("读取 PDD 商品的蝦皮关联失败: %w", err)
+		}
+		result = append(result, goodsID)
+	}
+	return result, rows.Err()
+}
+
 // UpdateShopeePddLink 更新蝦皮商品当前关联的 PDD 商品。
 // 调用方必须先在同一事务里保证 PDD 商品存在，避免留下悬空关联。
 func UpdateShopeePddLink(q Execer, shopeeGoodsID, pddGoodsID, pddURL string) error {
diff --git a/admin/repository/syb.go b/admin/repository/syb.go
index 4d54f60..18eb185 100644
--- a/admin/repository/syb.go
+++ b/admin/repository/syb.go
@@ -726,6 +726,26 @@ func GetSybOrderContext(q Execer, sybID string) (*SybOrderContext, error) {
 	return &row, nil
 }
 
+// ListSybIDsByShopeeGoodsID 限定读取一个蝦皮商品已有的有效规格明细，供写入事件幂等派生。
+func ListSybIDsByShopeeGoodsID(q Execer, goodsID string) ([]string, error) {
+	rows, err := q.Query(`SELECT syb_id FROM syb_orders
+		WHERE shopee_goods_id=? AND spec_key IS NOT NULL AND spec_key<>''
+		ORDER BY syb_id`, goodsID)
+	if err != nil {
+		return nil, fmt.Errorf("查询蝦皮商品 %s 的顺运宝明细失败: %w", goodsID, err)
+	}
+	defer rows.Close()
+	var result []string
+	for rows.Next() {
+		var sybID string
+		if err := rows.Scan(&sybID); err != nil {
+			return nil, fmt.Errorf("读取颜色辅助顺运宝明细失败: %w", err)
+		}
+		result = append(result, sybID)
+	}
+	return result, rows.Err()
+}
+
 // ListSybOrders 按筛选条件分页查货运单明细列表，按更新时间倒序。
 func ListSybOrders(q Execer, filter SybOrderFilter, limit, offset int) ([]model.SybOrder, error) {
 	where, args := sybOrderFilterClause(filter)
diff --git a/admin/service/color_mapping.go b/admin/service/color_mapping.go
index 8308145..f41217b 100644
--- a/admin/service/color_mapping.go
+++ b/admin/service/color_mapping.go
@@ -402,6 +402,9 @@ func SaveProductColorMappings(db *sql.DB, actor *model.User, goodsID, expectedCo
 		}
 		changed++
 	}
+	if _, err := DeriveProductColorSpecMappings(tx, context.ShopeeGoodsID); err != nil {
+		return 0, fmt.Errorf("颜色映射已校验但派生完整规格失败，整批未保存: %w", err)
+	}
 	if err := tx.Commit(); err != nil {
 		return 0, fmt.Errorf("提交颜色映射事务失败: %w", err)
 	}
diff --git a/admin/service/color_spec_derivation.go b/admin/service/color_spec_derivation.go
new file mode 100644
index 0000000..6d40645
--- /dev/null
+++ b/admin/service/color_spec_derivation.go
@@ -0,0 +1,304 @@
+package service
+
+import (
+	"crypto/sha256"
+	"encoding/json"
+	"fmt"
+	"math"
+	"sort"
+	"strings"
+
+	"cmautobuy/admin/model"
+	"cmautobuy/admin/repository"
+	"cmautobuy/admin/spec"
+)
+
+const (
+	// ColorAssistedSpecRulesVersion 标识由商品颜色映射辅助生成的完整规格映射。
+	ColorAssistedSpecRulesVersion = "color-spec-v1"
+	colorMappingSystemActor       = "system:color-mapping"
+)
+
+// ColorSpecDerivation 是一次幂等派生的业务结论。没有生成不是系统错误。
+type ColorSpecDerivation struct {
+	Outcome, Reason, OptionKey string
+	Changed                    bool
+}
+
+// ColorSpecDerivationSummary 是商品级事件处理既有顺运宝明细的汇总。
+type ColorSpecDerivationSummary struct {
+	Processed, Generated, Removed, Preserved, Skipped int
+}
+
+// DeriveSybSpecMappingFromProductColor 尝试为一条顺运宝明细生成完整 PDD 规格映射。
+// q 应当是触发写入事件所在的事务，数据库错误由调用方回滚该事务。
+func DeriveSybSpecMappingFromProductColor(q repository.Execer, sybID string) (ColorSpecDerivation, error) {
+	context, err := repository.GetSybOrderContext(q, strings.TrimSpace(sybID))
+	if err != nil {
+		return ColorSpecDerivation{}, err
+	}
+	if context == nil {
+		return ColorSpecDerivation{Outcome: "skipped", Reason: "顺运宝明细不存在"}, nil
+	}
+	existing, err := repository.GetSpecMapping(q, context.Order.ShopeeGoodsID, context.Order.SpecKey, context.PddGoodsID)
+	if err != nil {
+		return ColorSpecDerivation{}, err
+	}
+	if existing != nil && existing.Source == "manual" {
+		return ColorSpecDerivation{Outcome: "preserved", Reason: "已有人工完整规格映射", OptionKey: existing.PddOptionKey}, nil
+	}
+	removeOwnMapping := func(reason string) (ColorSpecDerivation, error) {
+		removed, removeErr := repository.DeleteAutomaticSpecMappingByVersion(q,
+			context.Order.ShopeeGoodsID, context.Order.SpecKey, context.PddGoodsID,
+			ColorAssistedSpecRulesVersion)
+		if removeErr != nil {
+			return ColorSpecDerivation{}, removeErr
+		}
+		outcome := "skipped"
+		if removed {
+			outcome = "removed"
+		}
+		return ColorSpecDerivation{Outcome: outcome, Reason: reason, Changed: removed}, nil
+	}
+
+	if context.Order.SpecKey == "" || context.Order.ShopeeGoodsID == "" {
+		return removeOwnMapping("顺运宝规格或蝦皮商品 ID 缺失")
+	}
+	parsed, ok := spec.ParseShopeeSpec(context.Order.ProductSpec)
+	if !ok {
+		return removeOwnMapping("顺运宝规格不能可靠解析出颜色和尺码")
+	}
+	if key, keyErr := spec.SpecKey(context.Order.ProductSpec); keyErr != nil || key != context.Order.SpecKey {
+		return ColorSpecDerivation{}, fmt.Errorf("顺运宝规格身份键不一致")
+	}
+	if context.PddGoodsID == "" || context.PddCollectStatus != string(model.CollectCollected) ||
+		strings.TrimSpace(context.PddSkusJSON) == "" {
+		return removeOwnMapping("当前 PDD 商品未关联或尚未完成采集")
+	}
+
+	colorKey := NormalizeProductColorKey(parsed.Color)
+	colorMapping, err := repository.GetProductColorMapping(q, context.Order.ShopeeGoodsID, colorKey, context.PddGoodsID)
+	if err != nil {
+		return ColorSpecDerivation{}, err
+	}
+	if colorMapping == nil {
+		return removeOwnMapping("当前蝦皮颜色没有商品级 PDD 颜色映射")
+	}
+	dimensionKey, colorCandidates, candidateErr := aggregatePddColorCandidates(context.PddSkusJSON)
+	if candidateErr != nil {
+		return removeOwnMapping(candidateErr.Error())
+	}
+	if colorMapping.PddDimensionKey != dimensionKey || !containsPddColorCandidate(colorCandidates, colorMapping.PddColorValue) {
+		return removeOwnMapping("商品颜色映射目标已不在当前可购买候选中")
+	}
+	choices, keys, names, err := pddOptionChoices(context.PddSkusJSON)
+	if err != nil {
+		return ColorSpecDerivation{}, fmt.Errorf("读取 PDD 完整规格失败: %w", err)
+	}
+	matched, reason := uniqueColorAssistedChoice(context.Order.ProductSpec, parsed, colorMapping, choices, keys, names)
+	if matched == nil {
+		return removeOwnMapping(reason)
+	}
+	if current := choiceByKey(choices, matched.Key); current.Key == "" {
+		return removeOwnMapping("唯一候选在写入前已不属于当前可购买组合")
+	}
+	if existing != nil && !(existing.Source == "rule" && existing.SourceVersion == ColorAssistedSpecRulesVersion) {
+		if current, findErr := findPddChoice(context.PddSkusJSON, existing.PddOptionKey); findErr != nil {
+			return ColorSpecDerivation{}, findErr
+		} else if current != nil {
+			return ColorSpecDerivation{Outcome: "preserved", Reason: "已有其他来源的有效完整规格映射", OptionKey: existing.PddOptionKey}, nil
+		}
+	}
+	version := colorAssistedSpecContextVersion(*context, *colorMapping)
+	if existing != nil && existing.Source == "rule" && existing.SourceVersion == ColorAssistedSpecRulesVersion &&
+		existing.ContextVersion == version && existing.PddOptionKey == matched.Key {
+		return ColorSpecDerivation{Outcome: "unchanged", Reason: "相同上下文已经生成完整规格映射", OptionKey: matched.Key}, nil
+	}
+	now := model.NowISO()
+	reasonText := fmt.Sprintf("商品颜色映射“%s”→“%s”后，剩余规格维度唯一命中当前可购买组合",
+		truncateRunes(parsed.Color, 120), truncateRunes(colorMapping.PddColorValue, 120))
+	changed, err := repository.UpsertAutomaticSpecMappingChanged(q, model.SpecMapping{
+		ShopeeGoodsID: context.Order.ShopeeGoodsID, SpecKey: context.Order.SpecKey,
+		SpecRaw: context.Order.ProductSpec, PddGoodsID: context.PddGoodsID,
+		PddOptionKey: matched.Key, PddOptions: matched.OptionsJSON,
+		MappedAt: now, MappedBy: colorMappingSystemActor, Source: "rule",
+		SourceReason: reasonText, SourceVersion: ColorAssistedSpecRulesVersion,
+		ContextVersion: version,
+	})
+	if err != nil {
+		return ColorSpecDerivation{}, err
+	}
+	if changed {
+		if err := repository.InsertSpecMappingDecision(q, model.SpecMappingDecision{
+			ShopeeGoodsID: context.Order.ShopeeGoodsID, SpecKey: context.Order.SpecKey,
+			PddGoodsID: context.PddGoodsID, RulesVersion: ColorAssistedSpecRulesVersion,
+			SuggestedOptionKey: matched.Key, ChosenOptionKey: matched.Key, Accepted: true,
+			DecidedBy: colorMappingSystemActor, DecidedAt: now,
+		}); err != nil {
+			return ColorSpecDerivation{}, err
+		}
+	}
+	return ColorSpecDerivation{Outcome: "generated", Reason: reasonText, OptionKey: matched.Key, Changed: changed}, nil
+}
+
+// DeriveProductColorSpecMappings 只扫描指定蝦皮商品已有的有效规格明细。
+func DeriveProductColorSpecMappings(q repository.Execer, goodsID string) (ColorSpecDerivationSummary, error) {
+	var summary ColorSpecDerivationSummary
+	ids, err := repository.ListSybIDsByShopeeGoodsID(q, strings.TrimSpace(goodsID))
+	if err != nil {
+		return summary, err
+	}
+	for _, sybID := range ids {
+		result, err := DeriveSybSpecMappingFromProductColor(q, sybID)
+		if err != nil {
+			return ColorSpecDerivationSummary{}, err
+		}
+		summary.Processed++
+		switch result.Outcome {
+		case "generated":
+			if result.Changed {
+				summary.Generated++
+			} else {
+				summary.Skipped++
+			}
+		case "removed":
+			summary.Removed++
+		case "preserved":
+			summary.Preserved++
+		default:
+			summary.Skipped++
+		}
+	}
+	return summary, nil
+}
+
+// DerivePddColorSpecMappings 处理当前关联某个 PDD 商品的全部蝦皮商品。
+func DerivePddColorSpecMappings(q repository.Execer, pddGoodsID string) (ColorSpecDerivationSummary, error) {
+	var total ColorSpecDerivationSummary
+	goodsIDs, err := repository.ListShopeeGoodsIDsByPddGoodsID(q, strings.TrimSpace(pddGoodsID))
+	if err != nil {
+		return total, err
+	}
+	for _, goodsID := range goodsIDs {
+		summary, err := DeriveProductColorSpecMappings(q, goodsID)
+		if err != nil {
+			return ColorSpecDerivationSummary{}, err
+		}
+		total.Processed += summary.Processed
+		total.Generated += summary.Generated
+		total.Removed += summary.Removed
+		total.Preserved += summary.Preserved
+		total.Skipped += summary.Skipped
+	}
+	return total, nil
+}
+
+func containsPddColorCandidate(candidates []PddColorCandidate, value string) bool {
+	for _, candidate := range candidates {
+		if candidate.Value == value {
+			return true
+		}
+	}
+	return false
+}
+
+func uniqueColorAssistedChoice(raw string, parsed spec.ParsedShopeeSpec, mapping *model.ProductColorMapping,
+	choices []PddOptionChoice, keys, names []string) (*PddOptionChoice, string) {
+	filtered := make([]PddOptionChoice, 0, len(choices))
+	for _, choice := range choices {
+		if choice.Options[mapping.PddDimensionKey] == mapping.PddColorValue {
+			filtered = append(filtered, choice)
+		}
+	}
+	if len(filtered) == 0 {
+		return nil, "目标 PDD 颜色没有当前可购买完整规格组合"
+	}
+	identifiedColor, sizeKey, ambiguous, _ := identifyDimensions(choices, keys, names)
+	if ambiguous || (identifiedColor != "" && identifiedColor != mapping.PddDimensionKey) {
+		return nil, "PDD 颜色或尺码维度定义不明确"
+	}
+	if sizeKey != "" {
+		sourceFeatures := extractSpecFeatures(parsed.Size + " " + parsed.Advice)
+		next := make([]PddOptionChoice, 0, len(filtered))
+		for _, choice := range filtered {
+			if deterministicSizeMatch(sourceFeatures, extractSpecFeatures(choice.Options[sizeKey]), parsed.Size, choice.Options[sizeKey]) {
+				next = append(next, choice)
+			}
+		}
+		filtered = next
+		if len(filtered) == 0 {
+			return nil, "目标 PDD 颜色下没有确定匹配的尺码"
+		}
+	}
+	for _, key := range keys {
+		if key == mapping.PddDimensionKey || key == sizeKey {
+			continue
+		}
+		values := map[string]bool{}
+		for _, choice := range filtered {
+			values[choice.Options[key]] = true
+		}
+		if len(values) <= 1 {
+			continue
+		}
+		var matches []string
+		normalizedRaw := normalizeDimensionSignal(raw)
+		for value := range values {
+			normalizedValue := normalizeDimensionSignal(value)
+			if normalizedValue != "" && strings.Contains(normalizedRaw, normalizedValue) {
+				matches = append(matches, value)
+			}
+		}
+		sort.Strings(matches)
+		if len(matches) != 1 {
+			return nil, "存在无法从顺运宝规格唯一确定的额外规格维度"
+		}
+		next := make([]PddOptionChoice, 0, len(filtered))
+		for _, choice := range filtered {
+			if choice.Options[key] == matches[0] {
+				next = append(next, choice)
+			}
+		}
+		filtered = next
+	}
+	if len(filtered) != 1 {
+		return nil, fmt.Sprintf("颜色和其余规格条件仍命中 %d 个可购买组合", len(filtered))
+	}
+	choice := filtered[0]
+	return &choice, ""
+}
+
+func deterministicSizeMatch(source, candidate specFeatures, sourceRaw, candidateRaw string) bool {
+	if source.size != "" && candidate.size != "" {
+		if source.size != candidate.size {
+			return false
+		}
+		if source.hasWeight && candidate.hasWeight {
+			return deterministicWeightContained(source, candidate)
+		}
+		return true
+	}
+	if source.hasWeight && candidate.hasWeight {
+		return deterministicWeightContained(source, candidate)
+	}
+	return normalizeDimensionSignal(sourceRaw) == normalizeDimensionSignal(candidateRaw)
+}
+
+func deterministicWeightContained(source, candidate specFeatures) bool {
+	if source.weightFrom < candidate.weightFrom || source.weightTo > candidate.weightTo {
+		return false
+	}
+	width := candidate.weightTo - candidate.weightFrom
+	target := source.weightTo - source.weightFrom
+	midpoint := math.Abs((source.weightFrom + source.weightTo - candidate.weightFrom - candidate.weightTo) / 2)
+	return width <= math.Max(target*maxCandidateWidthRatio, minCandidateWidthAllowanceJin) && midpoint <= maxMidpointDistanceJin
+}
+
+func colorAssistedSpecContextVersion(context repository.SybOrderContext, mapping model.ProductColorMapping) string {
+	payload, _ := json.Marshal([]string{
+		mappingContextVersion(context), mapping.ShopeeColorKey, mapping.PddDimensionKey,
+		mapping.PddColorValue, mapping.MappedAt, ProductColorMappingRulesVersion,
+		ColorAssistedSpecRulesVersion,
+	})
+	return fmt.Sprintf("%x", sha256.Sum256(payload))
+}
diff --git a/admin/service/color_spec_derivation_test.go b/admin/service/color_spec_derivation_test.go
new file mode 100644
index 0000000..e05c807
--- /dev/null
+++ b/admin/service/color_spec_derivation_test.go
@@ -0,0 +1,141 @@
+package service
+
+import (
+	"testing"
+
+	"cmautobuy/admin/model"
+	"cmautobuy/admin/repository"
+	"cmautobuy/admin/spec"
+)
+
+func colorChoice(t *testing.T, options map[string]string) PddOptionChoice {
+	t.Helper()
+	key, err := OptionKey(options)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return PddOptionChoice{Key: key, OptionsJSON: key, Options: options}
+}
+
+func TestUniqueColorAssistedChoice_颜色约束后尺码唯一才生成(t *testing.T) {
+	parsed, ok := spec.ParseShopeeSpec("黑色,M")
+	if !ok {
+		t.Fatal("测试规格应可解析")
+	}
+	mapping := &model.ProductColorMapping{PddDimensionKey: "color", PddColorValue: "曜石黑"}
+	choices := []PddOptionChoice{
+		colorChoice(t, map[string]string{"color": "曜石黑", "size": "M码"}),
+		colorChoice(t, map[string]string{"color": "曜石黑", "size": "L码"}),
+		colorChoice(t, map[string]string{"color": "奶油白", "size": "M码"}),
+	}
+	choice, reason := uniqueColorAssistedChoice("黑色,M", parsed, mapping, choices,
+		[]string{"color", "size"}, []string{"颜色分类", "尺码"})
+	if choice == nil || choice.Options["color"] != "曜石黑" || choice.Options["size"] != "M码" || reason != "" {
+		t.Fatalf("唯一匹配错误 choice=%+v reason=%q", choice, reason)
+	}
+
+	choices = append(choices, colorChoice(t, map[string]string{"color": "曜石黑", "size": "M码", "style": "加绒"}))
+	choices[0].Options["style"] = "常规"
+	choices[0].Key, _ = OptionKey(choices[0].Options)
+	choices[0].OptionsJSON = choices[0].Key
+	if got, reason := uniqueColorAssistedChoice("黑色,M", parsed, mapping, choices,
+		[]string{"color", "size", "style"}, []string{"颜色分类", "尺码", "款式"}); got != nil || reason == "" {
+		t.Fatalf("第三维度不唯一时不应生成 got=%+v reason=%q", got, reason)
+	}
+}
+
+func TestSaveProductColorMappings_事件生成清除完整规格且保护人工结果(t *testing.T) {
+	db := newTestDB(t)
+	seedShopeeProduct(t, db, "S-DERIVE", "颜色派生商品")
+	seedShopeeSKU(t, db, "SKU-DERIVE", "S-DERIVE", "黑色,M", "黑色", "M", "", true)
+	if _, err := repository.EnsurePddProduct(db, "P-DERIVE", "https://mobile.yangkeduo.com/goods.html?goods_id=P-DERIVE"); err != nil {
+		t.Fatal(err)
+	}
+	collected := `{"dimensions":[{"key":"color","name":"颜色分类"},{"key":"size","name":"尺码"}],"skus":[` +
+		`{"options":{"color":"曜石黑","size":"M码"},"price_cent":1180,"available":true},` +
+		`{"options":{"color":"曜石黑","size":"L码"},"price_cent":1280,"available":true}]}`
+	if err := repository.SetCollectResult(db, "P-DERIVE", "PDD 商品", "店铺", collected); err != nil {
+		t.Fatal(err)
+	}
+	setShopeePddLink(t, db, "S-DERIVE", "P-DERIVE", "https://mobile.yangkeduo.com/goods.html?goods_id=P-DERIVE")
+	order := seedWorkflowOrder(t, db, "SYB-DERIVE", "S-DERIVE", "黑色,M")
+	specKey, _ := spec.SpecKey(order.ProductSpec)
+	context, err := GetProductColorMappingContext(db, "S-DERIVE")
+	if err != nil {
+		t.Fatal(err)
+	}
+	actor := &model.User{UserID: "U-DERIVE", Status: model.UserActive}
+	if changed, err := SaveProductColorMappings(db, actor, "S-DERIVE", context.ContextVersion,
+		[]ProductColorMappingUpdate{{ShopeeColorKey: "黑色", TargetValue: "曜石黑"}}); err != nil || changed != 1 {
+		t.Fatalf("颜色保存应触发派生 changed=%d err=%v", changed, err)
+	}
+	mapping, err := repository.GetSpecMapping(db, "S-DERIVE", specKey, "P-DERIVE")
+	if err != nil || mapping == nil || mapping.Source != "rule" || mapping.SourceVersion != ColorAssistedSpecRulesVersion {
+		t.Fatalf("完整规则映射未生成 mapping=%+v err=%v", mapping, err)
+	}
+	firstKey := mapping.PddOptionKey
+	if result, err := DeriveSybSpecMappingFromProductColor(db, "SYB-DERIVE"); err != nil || result.Changed {
+		t.Fatalf("重复事件必须幂等 result=%+v err=%v", result, err)
+	}
+	var decisions int
+	if err := db.QueryRow(`SELECT COUNT(*) FROM spec_mapping_decisions
+		WHERE shopee_goods_id='S-DERIVE' AND rules_version=?`, ColorAssistedSpecRulesVersion).Scan(&decisions); err != nil || decisions != 1 {
+		t.Fatalf("重复事件不应重复审计 decisions=%d err=%v", decisions, err)
+	}
+
+	context, _ = GetProductColorMappingContext(db, "S-DERIVE")
+	if _, err := SaveProductColorMappings(db, actor, "S-DERIVE", context.ContextVersion,
+		[]ProductColorMappingUpdate{{ShopeeColorKey: "黑色"}}); err != nil {
+		t.Fatal(err)
+	}
+	mapping, _ = repository.GetSpecMapping(db, "S-DERIVE", specKey, "P-DERIVE")
+	if mapping != nil {
+		t.Fatalf("清除颜色映射后应移除本规则完整映射：%+v", mapping)
+	}
+
+	context, _ = GetProductColorMappingContext(db, "S-DERIVE")
+	if _, err := SaveProductColorMappings(db, actor, "S-DERIVE", context.ContextVersion,
+		[]ProductColorMappingUpdate{{ShopeeColorKey: "黑色", TargetValue: "曜石黑"}}); err != nil {
+		t.Fatal(err)
+	}
+	manualKey, _ := OptionKey(map[string]string{"color": "曜石黑", "size": "L码"})
+	if err := repository.UpsertSpecMapping(db, model.SpecMapping{
+		ShopeeGoodsID: "S-DERIVE", SpecKey: specKey, SpecRaw: order.ProductSpec,
+		PddGoodsID: "P-DERIVE", PddOptionKey: manualKey, PddOptions: manualKey,
+		Source: "manual", MappedBy: "U-MANUAL", MappedAt: model.NowISO(),
+	}); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := DeriveSybSpecMappingFromProductColor(db, "SYB-DERIVE"); err != nil {
+		t.Fatal(err)
+	}
+	mapping, _ = repository.GetSpecMapping(db, "S-DERIVE", specKey, "P-DERIVE")
+	if mapping == nil || mapping.Source != "manual" || mapping.PddOptionKey != manualKey || mapping.PddOptionKey == firstKey {
+		t.Fatalf("人工完整映射被规则覆盖：%+v", mapping)
+	}
+}
+
+func TestSubmitResult_Pdd采集写入事件派生完整规格(t *testing.T) {
+	db := newTestDB(t)
+	seedWorkflowOrder(t, db, "SYB-COLLECT-HOOK", "SHOPEE-1", "黑色,M")
+	insertPddProduct(t, db, "PDD-1")
+	if err := repository.UpdateShopeePddLink(db, "SHOPEE-1", "PDD-1", "https://mobile.yangkeduo.com/goods.html?goods_id=PDD-1"); err != nil {
+		t.Fatal(err)
+	}
+	if err := repository.UpsertProductColorMapping(db, model.ProductColorMapping{
+		ShopeeGoodsID: "SHOPEE-1", ShopeeColorKey: "黑色", ShopeeColorRaw: "黑色",
+		PddGoodsID: "PDD-1", PddDimensionKey: "color", PddColorValue: "黑色",
+		ContextVersion: "ctx", MappedBy: "U-1", MappedAt: model.NowISO(),
+	}); err != nil {
+		t.Fatal(err)
+	}
+	insertCollectTask(t, db, "TASK-COLOR-HOOK", "client-001", "SHOPEE-1", "PDD-1")
+	claimTask(t, db, "TASK-COLOR-HOOK", "client-001")
+	if _, err := SubmitResult(db, "TASK-COLOR-HOOK", "client-001", "key-color-hook", []byte(collectBody)); err != nil {
+		t.Fatal(err)
+	}
+	context, err := repository.GetSybOrderContext(db, "SYB-COLLECT-HOOK")
+	if err != nil || context == nil || context.MappingOptionKey == "" || context.MappingSource != "rule" {
+		t.Fatalf("PDD 采集事件没有派生完整规格 context=%+v err=%v", context, err)
+	}
+}
diff --git a/admin/service/submit.go b/admin/service/submit.go
index 1c06d55..1bb91c6 100644
--- a/admin/service/submit.go
+++ b/admin/service/submit.go
@@ -163,9 +163,14 @@ func SubmitResult(db *sql.DB, taskID, clientID, idemKey string, rawBody []byte)
 						"未采集到任何规格，请检查商品是否已下架", ""); err != nil {
 						return nil, err
 					}
-				} else if err := repository.SetCollectResult(
-					tx, info.PddGoodsID, collected.Title, collected.ShopName, pddData); err != nil {
-					return nil, err
+				} else {
+					if err := repository.SetCollectResult(
+						tx, info.PddGoodsID, collected.Title, collected.ShopName, pddData); err != nil {
+						return nil, err
+					}
+					if _, err := DerivePddColorSpecMappings(tx, info.PddGoodsID); err != nil {
+						return nil, fmt.Errorf("PDD 采集结果已校验但派生顺运宝完整规格失败: %w", err)
+					}
 				}
 			}
 			return map[string]any{
diff --git a/admin/service/syb.go b/admin/service/syb.go
index e24ad21..5ba074b 100644
--- a/admin/service/syb.go
+++ b/admin/service/syb.go
@@ -911,6 +911,9 @@ func writeStockDetail(db *sql.DB, baseURL, shopID string, stockRow syb.StockRow,
 		if _, err := repository.UpsertSybShopeeSKU(tx, order.ShopeeGoodsID, order.ProductSpec, model.NowISO()); err != nil {
 			return fmt.Errorf("写入顺运宝规格观测失败: %w", err)
 		}
+		if _, err := DeriveSybSpecMappingFromProductColor(tx, sybID); err != nil {
+			return fmt.Errorf("根据商品颜色映射派生顺运宝完整规格失败: %w", err)
+		}
 		if created {
 			report.Created++
 		} else {
diff --git a/docs/admin/01-requirements.md b/docs/admin/01-requirements.md
index d2e8d7c..90604f7 100644
--- a/docs/admin/01-requirements.md
+++ b/docs/admin/01-requirements.md
@@ -265,6 +265,13 @@ PDD 商品之所以单独一个模块，是因为它在数据上就是**独立
   而不是显示一个空列表让人困惑。
 - 规则引擎只对可购买候选做 A/B/C/冲突分层和稳定排序；只有唯一、无额外维度歧义的 A 级才预选。
 - 预选不会自动保存或创建采购任务。页面必须显示推荐理由，采购员点击保存后才写映射和只追加的决策审计。
+- 商品级颜色映射是完整规格解析的一个确定性输入，不是采购旁路。顺运宝规格能可靠解析出
+  颜色和尺码时，系统用当前商品颜色映射先限定 PDD 颜色，再确定尺码和其他维度；只有最终
+  剩余一个当前可购买完整组合才以规则来源写入 `spec_mappings`。零命中、多命中、额外维度
+  不明确或颜色目标失效都保持待匹配，不自动创建采购任务。
+- 颜色映射保存、顺运宝明细写入和 PDD 采集结果更新都在各自事务中调用同一个幂等派生服务。
+  人工完整映射永远保留；其他来源仍有效的完整映射不被颜色规则替换。规则自己的依据失效时
+  清除当前派生结果，使现有处理阶段自然回到待匹配。
 
 **创建采购任务：** 只有映射仍有效且没有进行中采购任务的行可勾选。确认弹窗列出
 当前账号可见的全部客户端都可选择，暂时离线或尚未就绪也可提前指派并等待其就绪后领取。
diff --git a/docs/admin/03-data-model.md b/docs/admin/03-data-model.md
index 7db7e62..e7bc5e3 100644
--- a/docs/admin/03-data-model.md
+++ b/docs/admin/03-data-model.md
@@ -1183,3 +1183,12 @@ CREATE TABLE purchase_spec_resolutions (
 
 `product_color_mapping_audits` 是只追加审计表，记录 `upsert/clear` 的旧值、新值、操作账号、
 上下文版本和时间。清除操作只删除当前态，不删除审计；两张表都不保存提示词、模型响应或凭据。
+
+颜色映射辅助完整规格时不新增第三张派生表。唯一结果继续写入既有 `spec_mappings`：
+`source='rule'`、`source_version='color-spec-v1'`，`source_reason` 记录颜色映射依据，
+`context_version` 覆盖顺运宝规格、当前 PDD 快照、颜色目标和规则版本；同时向既有
+`spec_mapping_decisions` 追加成功决策。重复处理同一上下文不重复更新或追加审计。
+
+只有本规则自己生成的映射会在颜色依据缺失、目标失效或剩余维度不唯一时被移除；人工映射
+和其他来源的有效完整映射不覆盖、不删除。处理阶段和采购创建仍只认当前 PDD 商品下存在且
+选项仍可购买的完整 `spec_mappings`，颜色表本身不提供可采购状态。