diff --git a/docs/12-syb-erp-interface.md b/docs/12-syb-erp-interface.md
index 09da324..3710332 100644
--- a/docs/12-syb-erp-interface.md
+++ b/docs/12-syb-erp-interface.md
@@ -2,8 +2,8 @@
 generated: true (请先修改 Gitea Wiki，禁止直接编辑本文件)
 wiki_page: SYB-ERP-Interface-Contract
 wiki_url: https://git.ilapage.cn/OPC/goauto/wiki/SYB-ERP-Interface-Contract.-
-wiki_revision: ad9adc22e69e48c9a8fd87d7121066eecca55fd6
-synchronized_at: 2026-09-04T11:30:50Z
+wiki_revision: df0fe874c7f3f3e9c031f2f793f8f6a0511ace25
+synchronized_at: 2026-09-07T06:25:27Z
 <!-- gitea-wiki-mirror:end -->
 
 # 12 顺云宝（SYB）ERP 接口契约
@@ -228,6 +228,14 @@ Admin 默认 `max_matches = 10000`，可以在配置中调整；上限针对整
 读取完整明细并按既有 upsert 保存，但本次同步仍记为失败、明确提示当天未形成
 稳定快照且不推进游标，下一次继续覆盖今天。任何尝试都不得突破 `max_matches`；
 网络/业务错误、非法 ID 或不完整明细不属于可放宽的快照漂移。
+`[必须，#235]` 当天跨页重复 ID 纳入上述最多 3 次列表快照尝试（含首次），
+不增加另一层重试次数。发现跨页重复后丢弃本次列表，从预检总数和第一页重新开始，
+使用全新 ID 集合；最后一次仍重复时直接失败，不得去重后按成功或降级数据保存。
+已经完成的历史日期保持其已有结果，不重复拉取；历史日期重复不适用此恢复。
+每页先检查非法 ID 和页内重复，再检查跨页重叠；同页同时存在页内重复和跨页重叠时
+仍作为硬错误停止。原有总数漂移/短页的合法唯一列表降级保存条件保持不变。
+重复诊断只记录日期、当天尝试序号、首次/当前页码与行号、start、pageSize、
+expectedTotal 和已获取唯一数量，不记录真实重复 ID、原始响应或个人数据。
 
 ### 4.4 统一日期范围同步与覆盖游标
 
diff --git a/server/app/goauto/sybimport/pagination_overlap_test.go b/server/app/goauto/sybimport/pagination_overlap_test.go
new file mode 100644
index 0000000..4859294
--- /dev/null
+++ b/server/app/goauto/sybimport/pagination_overlap_test.go
@@ -0,0 +1,101 @@
+package sybimport
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+)
+
+func freezePaginationToday(t *testing.T) {
+	t.Helper()
+	previous := syncNow
+	syncNow = func() time.Time { return time.Date(2026, 8, 29, 12, 0, 0, 0, time.FixedZone("Asia/Shanghai", 8*60*60)) }
+	t.Cleanup(func() { syncNow = previous })
+}
+
+func TestTodayCrossPageOverlapRestartsWithIndependentIDs(t *testing.T) {
+	freezePaginationToday(t)
+	f := &fakeSYB{perDay: map[string]int{"2026-08-29": 4}}
+	f.pageIDs = func(_ string, start, call int) []int64 {
+		if call == 2 {
+			return []int64{1001, 1002}
+		}
+		if call > 2 {
+			return []int64{int64(2000 + start), int64(2001 + start)}
+		}
+		return nil
+	}
+	rows, err := loadDailyListWithRecovery(context.Background(), newSyncClient(t, f), "2026-08-29", 2, 4, 100)
+	if err != nil || len(rows) != 4 || f.listTotalCalls != 2 {
+		t.Fatalf("rows=%d totals=%d err=%v", len(rows), f.listTotalCalls, err)
+	}
+	if got := strings.Join(f.listCalls, ","); got != "2026-08-29:0,2026-08-29:2,2026-08-29:0,2026-08-29:2" {
+		t.Fatalf("did not restart at first page: %s", got)
+	}
+	for index, row := range rows {
+		if row.ID != int64(2000+index) {
+			t.Fatal("rows leaked from abandoned attempt")
+		}
+	}
+}
+
+func TestTodayPersistentOverlapPreservesYesterdayButDoesNotImportToday(t *testing.T) {
+	freezePaginationToday(t)
+	f := &fakeSYB{perDay: map[string]int{"2026-08-28": 2, "2026-08-29": 4}}
+	f.pageIDs = func(date string, start, _ int) []int64 {
+		if date == "2026-08-29" && start == 2 {
+			return []int64{1001, 1002}
+		}
+		return nil
+	}
+	db := newSyncTestDB(t)
+	report, err := Sync(context.Background(), db, newSyncClient(t, f), SyncConfig{PageSize: 2, MaxMatches: 100}, "2026-08-28", "2026-08-29")
+	if err == nil {
+		t.Fatal("overlap was treated as successful sync")
+	}
+	for _, token := range []string{"连续 3 次", "跨页重复", "firstPage=1", "firstRow=2", "page=2", "row=1", "start=2", "pageSize=2", "expectedTotal=4", "unique=2"} {
+		if !strings.Contains(err.Error(), token) {
+			t.Fatalf("missing %s in %v", token, err)
+		}
+	}
+	if strings.Contains(err.Error(), "1001") || strings.Contains(err.Error(), "已保存") {
+		t.Fatalf("unsafe diagnosis/degraded save: %v", err)
+	}
+	if len(f.listCalls) != 7 || f.detailCalls != 1 || report.OrderCount != 2 {
+		t.Fatalf("unexpected retry/import boundary: pages=%d details=%d orders=%d", len(f.listCalls), f.detailCalls, report.OrderCount)
+	}
+	var count int64
+	if e := db.Table("syb_product").Count(&count).Error; e != nil || count != 2 {
+		t.Fatalf("yesterday not preserved: count=%d err=%v", count, e)
+	}
+}
+
+func TestPaginationHardErrorsDoNotUseOverlapRecovery(t *testing.T) {
+	freezePaginationToday(t)
+	for _, tc := range []struct {
+		name, date, message string
+		page                int
+		ids                 []int64
+		calls               int
+	}{
+		{"same page", "2026-08-29", "同页重复", 0, []int64{1000, 1000}, 1},
+		{"mixed overlap and same page", "2026-08-29", "同页重复", 2, []int64{1001, 1001}, 2},
+		{"overlap and invalid ID", "2026-08-29", "非法 id", 2, []int64{1001, 0}, 2},
+		{"historical overlap", "2026-08-28", "跨页重复", 2, []int64{1001, 1002}, 2},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			f := &fakeSYB{perDay: map[string]int{tc.date: 4}}
+			f.pageIDs = func(_ string, start, _ int) []int64 {
+				if start == tc.page {
+					return tc.ids
+				}
+				return nil
+			}
+			rows, err := loadDailyListWithRecovery(context.Background(), newSyncClient(t, f), tc.date, 2, 4, 100)
+			if rows != nil || err == nil || !strings.Contains(err.Error(), tc.message) || len(f.listCalls) != tc.calls || f.listTotalCalls != 0 {
+				t.Fatalf("unexpected recovery: rows=%d pages=%d totals=%d err=%v", len(rows), len(f.listCalls), f.listTotalCalls, err)
+			}
+		})
+	}
+}
diff --git a/server/app/goauto/sybimport/sync.go b/server/app/goauto/sybimport/sync.go
index f167080..eb7982f 100644
--- a/server/app/goauto/sybimport/sync.go
+++ b/server/app/goauto/sybimport/sync.go
@@ -358,7 +358,7 @@ func loadDailyListWithRecovery(ctx context.Context, client *sybclient.Client, da
 		}
 		var drift *snapshotDriftError
 		if !errors.As(err, &drift) {
-			return nil, err
+			return nil, fmt.Errorf("今天第 %d/%d 次拉取失败: %w", attempt, maxTodaySnapshotAttempts, err)
 		}
 		last = drift
 	}
@@ -370,7 +370,8 @@ func loadDailyListWithRecovery(ctx context.Context, client *sybclient.Client, da
 
 func loadDailyList(ctx context.Context, client *sybclient.Client, date string, pageSize, expectedTotal int) ([]sybclient.StockRow, error) {
 	rows := make([]sybclient.StockRow, 0, expectedTotal)
-	seen := make(map[int64]struct{}, expectedTotal)
+	type position struct{ page, row int }
+	seen := make(map[int64]position, expectedTotal)
 
 	for start := 0; start < expectedTotal; start += pageSize {
 		pageIndex := start/pageSize + 1
@@ -386,14 +387,27 @@ func loadDailyList(ctx context.Context, client *sybclient.Client, date string, p
 		if pageCount != len(page) {
 			return nil, fmt.Errorf("%s 货运单列表第 %d 页响应条数不自洽：total=%d，list=%d", date, pageIndex, pageCount, len(page))
 		}
-		for _, row := range page {
+		// Validate the whole page first: a same-page duplicate must not be
+		// hidden behind an earlier, recoverable cross-page overlap.
+		pageSeen := make(map[int64]int, len(page))
+		for index, row := range page {
 			if row.ID <= 0 {
 				return nil, fmt.Errorf("%s 货运单列表包含非法 id=%d", date, row.ID)
 			}
-			if _, duplicate := seen[row.ID]; duplicate {
-				return nil, fmt.Errorf("%s 货运单列表重复返回 id=%d", date, row.ID)
+			if firstRow, duplicate := pageSeen[row.ID]; duplicate {
+				return nil, fmt.Errorf("%s 货运单列表同页重复 [firstPage=%d,firstRow=%d,page=%d,row=%d,start=%d,pageSize=%d,expectedTotal=%d,unique=%d]",
+					date, pageIndex, firstRow, pageIndex, index+1, start, pageSize, expectedTotal, len(rows))
 			}
-			seen[row.ID] = struct{}{}
+			pageSeen[row.ID] = index + 1
+		}
+		for index, row := range page {
+			if first, duplicate := seen[row.ID]; duplicate {
+				// No rows/valid flag: overlapping pages are never eligible for
+				// the existing final-attempt degraded save, even after deduping.
+				return nil, &snapshotDriftError{message: fmt.Sprintf("%s 货运单列表跨页重复 [firstPage=%d,firstRow=%d,page=%d,row=%d,start=%d,pageSize=%d,expectedTotal=%d,unique=%d]",
+					date, first.page, first.row, pageIndex, index+1, start, pageSize, expectedTotal, len(rows))}
+			}
+			seen[row.ID] = position{page: pageIndex, row: index + 1}
 			rows = append(rows, row)
 		}
 		if len(page) != expectedPageCount {
diff --git a/server/app/goauto/sybimport/sync_test.go b/server/app/goauto/sybimport/sync_test.go
index 8af5525..0fb2cb8 100644
--- a/server/app/goauto/sybimport/sync_test.go
+++ b/server/app/goauto/sybimport/sync_test.go
@@ -60,6 +60,9 @@ type fakeSYB struct {
 	totalOverride    map[int]int
 	shortPageAtIndex int
 	detailDropID     int64
+	listCalls        []string
+	pageIDs          func(date string, start, call int) []int64
+	detailCalls      int
 	// shopNames 按货运单序号轮换；留空表示全部用「测试店铺」。
 	shopNames []string
 	// detailShopName 非空时，明细响应里的 shopName 用它覆盖，
@@ -96,6 +99,7 @@ func (f *fakeSYB) server(t *testing.T) *httptest.Server {
 		start := int(body["start"].(float64))
 		pageSize := int(body["length"].(float64))
 		total := f.perDay[date]
+		f.listCalls = append(f.listCalls, fmt.Sprintf("%s:%d", date, start))
 
 		rows := []map[string]any{}
 		for i := start; i < total && len(rows) < pageSize; i++ {
@@ -108,9 +112,18 @@ func (f *fakeSYB) server(t *testing.T) *httptest.Server {
 		if f.shortPageAtIndex > 0 && start/pageSize+1 == f.shortPageAtIndex && len(rows) > 0 {
 			rows = rows[:len(rows)-1]
 		}
+		if f.pageIDs != nil {
+			if ids := f.pageIDs(date, start, len(f.listCalls)); ids != nil {
+				rows = nil
+				for _, id := range ids {
+					rows = append(rows, map[string]any{"id": id, "code": "TEST", "shopName": f.shopFor(0)})
+				}
+			}
+		}
 		writeEnvelope(w, map[string]any{"list": rows, "total": len(rows)})
 	})
 	mux.HandleFunc("/am/stock/detail/listByStock", func(w http.ResponseWriter, r *http.Request) {
+		f.detailCalls++
 		var body struct {
 			IDs []int64 `json:"ids"`
 		}