added_on = models.DateTimeField(auto_now_add=True)

We have a queue implementation to hold the logs before inserting into the database or it waits for a period of time to let the queue to be filled. If queue is full then only it inserts into the database.

So I added timezone aware datetime object in log before adding into the queue. This is the actual time of API call.

If "auto_now_add" is sets to True, It ignores the date passed explicitly to DateTimeField. You can check here https://code.djangoproject.com/ticket/16583.

If we use "auto_now_add=True" and Logs are inserted after some seconds, It will use Insertion time in "added_on" field. This will be wrong information and it is going to create a problem in debugging.

Yeah, I did't consider at that aspect. Current Implementation makes sense.