Database table design for scheduling tasks

Question

I want to be able to create schedules that can be executed based on a fixed date, repeated daily, repeated on a particular day of the week, repeated on a particular month of

Answer 1

I have read through the answers above and I think a lot of things are unnecessary, correct me if I'm wrong.

Here is what I think should be done:

Schedule

---

• Id

• type (Daily, monthly, weekly, fixed, yearly) - Enum

• frequency (Can be 1-7[days of week], 1-30(or 28)[days of month], 1-365[days of year] or null(for daily, fixed) - ArrayField(of ints) - [1, 7] OR [23] OR [235]OR null

• time (time of day in UTC) - ArrayField(of Char strings - ['9:00', '13:30']

• date (for fixed type) - datetime - 2009-03-21

• is_active (boolean) - for enabling, disabling the schedule

• name (CharField) - If you want to name the schedule

Rest of the fields would require context to what you are building.

Now, for this I'm thinking of running a cronjob every 30mins(I'm taking time input separated by 30mins) which runs a script(django management command in my case) which filters schedules from this table that need to be run:

Query would be something like this:

current_day_of_week = 3
current_day_of_month = 24
current_day_of_year = 114
current_time = 13:30
current_date = 2019-04-24

Filter records that match the below query(not even psuedo code)(I'm using Q objects(https://docs.djangoproject.com/en/2.2/topics/db/queries/#complex-lookups-with-q-objects)

Q(daily AND current_time) OR
Q(weekly AND current_day_of_week AND current_time) OR
Q(monthly AND current_day_of_month AND current_time) OR
Q(yearly AND current_day_of_year AND current_time) OR
Q(fixed AND current_date AND current_time)