diff --git a/apiserver/apiserver/api/models.py b/apiserver/apiserver/api/models.py
index 0a9517b..021821d 100644
--- a/apiserver/apiserver/api/models.py
+++ b/apiserver/apiserver/api/models.py
@@ -165,8 +165,6 @@ class UsageTrack(models.Model):
     start_time = models.DateTimeField(auto_now_add=True)
     num_seconds = models.IntegerField()
 
-    history = HistoricalRecords(excluded_fields=['num_seconds'])
-
 class HistoryIndex(models.Model):
     content_type = models.ForeignKey(ContentType, null=True, on_delete=models.SET_NULL)
     object_id = models.PositiveIntegerField()
diff --git a/apiserver/delete_usagetracks.py b/apiserver/delete_usagetracks.py
new file mode 100755
index 0000000..c45e8c0
--- /dev/null
+++ b/apiserver/delete_usagetracks.py
@@ -0,0 +1,13 @@
+import django, sys, os
+os.environ['DJANGO_SETTINGS_MODULE'] = 'apiserver.settings'
+django.setup()
+
+from apiserver.api import models
+
+indexs = models.HistoryIndex.objects.filter(object_name='UsageTrack')
+count = indexs.delete()
+print(count, 'indexs deleted')
+
+changes = models.HistoryChange.objects.filter(field='num_seconds')
+count = changes.delete()
+print(count, 'changes deleted')