Fix save LiveLesson

apps/school/models.py

@@ -115,6 +115,11 @@ class LiveLesson(BaseModel, DeactivatedMixin):
     def __str__(self):
         return self.title
 
+    def save(self, *args, **kwargs):
+        if not self.id and LiveLesson.objects.filter(date=self.date).exists():
+            self.date = (datetime.combine(self.date, now().time()) + timedelta(days=1)).date()
+        super().save(*args, **kwargs)
+
     def stream_index(self):
         return self.stream.split('/')[-1]