diff --git a/backend/internal/modules/invitation/repository_test.go b/backend/internal/modules/invitation/repository_test.go
index 12e070f..98860c4 100644
--- a/backend/internal/modules/invitation/repository_test.go
+++ b/backend/internal/modules/invitation/repository_test.go
@@ -341,7 +341,9 @@ func TestAwardSellerSideRebateTxAwardsOncePerSource(t *testing.T) {
 		t.Fatalf("创建号主失败: %v", err)
 	}
 
-	verifiedAt := time.Now().AddDate(0, 0, -2) // 距结算 2 天 => 首月 60%
+	// 距结算 2 天 => 首月 60%。
+	// Truncate 到整秒：DATETIME(0) 会把小数秒四舍五入，带小数时可能进位成不足 48 小时而算作 1 天。
+	verifiedAt := time.Now().AddDate(0, 0, -2).Truncate(time.Second)
 	if err := db.Create(&model.UserInvitation{
 		InviterID:  inviter.ID,
 		InviteeID:  seller.ID,
diff --git a/backend/internal/modules/pickup/repository_test.go b/backend/internal/modules/pickup/repository_test.go
index 86ea617..dc452cf 100644
--- a/backend/internal/modules/pickup/repository_test.go
+++ b/backend/internal/modules/pickup/repository_test.go
@@ -376,7 +376,8 @@ func TestRepositoryCompletePickupAwardsSellerInvitationRebate(t *testing.T) {
 	}
 
 	listing := seedAvailableListing(t, db, "LST-REBATE-001", "返利提号账号", false)
-	verifiedAt := time.Now().AddDate(0, 0, -2) // 距提号完成 2 天 => 首月 60% 档
+	// 距提号完成 2 天 => 首月 60% 档；Truncate 到整秒避免 DATETIME(0) 四舍五入影响天数计算。
+	verifiedAt := time.Now().AddDate(0, 0, -2).Truncate(time.Second)
 	if err := db.Create(&model.UserInvitation{
 		InviterID:  inviter.ID,
 		InviteeID:  listing.OwnerID,