Pass update fields when ticking last active date

bookwyrm/models/readthrough.py

@@ -30,7 +30,7 @@ class ReadThrough(BookWyrmModel):
     def save(self, *args, **kwargs):
         """update user active time"""
         self.user.last_active_date = timezone.now()
-        self.user.save(broadcast=False)
+        self.user.save(broadcast=False, update_fields=["last_active_date"])
         super().save(*args, **kwargs)
 
     def create_update(self):
@@ -55,5 +55,5 @@ class ProgressUpdate(BookWyrmModel):
     def save(self, *args, **kwargs):
         """update user active time"""
         self.user.last_active_date = timezone.now()
-        self.user.save(broadcast=False)
+        self.user.save(broadcast=False, update_fields=["last_active_date"])
         super().save(*args, **kwargs)