Django: How to automatically change a field's value at the time mentioned in the same object?
Is there any reason you wouldn't just calculate the boolean field in your business logic?  i.e. when you receive a request related to that race, simply check the times and assess whether or not the race is active (for display, analysis), etc.
I'm assuming you won't have high load (one reason for pre-processing) like this.
I am working on a django project for racing event in which a table in the database has three fields.
1)Boolean field to know whether race is active or not
2)Race start time
3)Race end time
While creating an object of it,the start_time and end_time are specified. How to change the value of boolean field to True when the race starts and
to False when it ends? How to schedule these activities?