diff --git a/apps/wpm/migrations/0047_alter_sflogexp_unique_together.py b/apps/wpm/migrations/0047_alter_sflogexp_unique_together.py
new file mode 100644
index 00000000..83dd2c63
--- /dev/null
+++ b/apps/wpm/migrations/0047_alter_sflogexp_unique_together.py
@@ -0,0 +1,17 @@
+# Generated by Django 3.2.12 on 2024-05-15 04:56
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('wpm', '0046_auto_20240515_1037'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='sflogexp',
+            unique_together={('sflog', 'stlog')},
+        ),
+    ]
diff --git a/apps/wpm/models.py b/apps/wpm/models.py
index 26dff1e5..19172b93 100644
--- a/apps/wpm/models.py
+++ b/apps/wpm/models.py
@@ -81,6 +81,8 @@ class SfLogExp(CommonADModel):
     duration_sec = models.PositiveIntegerField('持续时长(s)', null=True, blank=True)
     note = models.TextField('处理备注', default='', blank=True)
 
+    class Meta:
+        unique_together = ('sflog', 'stlog')
 
 class WMaterial(CommonBDModel):
     """
diff --git a/apps/wpm/tasks.py b/apps/wpm/tasks.py
index bae8665b..ad341e54 100644
--- a/apps/wpm/tasks.py
+++ b/apps/wpm/tasks.py
@@ -60,7 +60,7 @@ def get_total_sec_now(sflogId: str=''):
 @shared_task(base=CustomTask)
 def cal_exp_duration_sec(stlogId: str='', all=False):
     """
-    计算异常记录对应的每班持续时间
+    计算异常记录对应的每班持续时间(只针对工段)
     """
     # from apps.enm.tasks import cal_enstat  # 如果是停机需要进行统计停机时长
     if stlogId:
@@ -84,7 +84,7 @@ def cal_exp_duration_sec(stlogId: str='', all=False):
         sf_qs = SfLog.objects.filter(mgroup=stlog.mgroup)
         sf_qs = (sf_qs.filter(start_time__gte=st_start, start_time__lt=st_end) | sf_qs.filter(end_time__gt=st_start,
                  end_time__lte=st_end) | sf_qs.filter(start_time__lte=st_start, end_time__gte=st_end)).order_by('start_time').distinct()
-        SfLogExp.objects.filter(stlog=stlog, sflog__in=sf_qs).delete()
+        SfLogExp.objects.filter(stlog=stlog).exclude(sflog__in=sf_qs).delete()
         for ind, sflog in enumerate(sf_qs):
             sflogexp, _ = SfLogExp.objects.get_or_create(stlog=stlog, sflog=sflog, defaults={
                                                          'stlog': stlog, 'sflog': sflog})