Run a command based program at a custom date-time (Add/modify/delete)

I have a python script which takes few params as argument and I need to run tasks based on this script at a given date and time with other params. I am making an UI to add/modify/delete such tasks with all given params. How do I do it? Is there any tool available? I dont think crontabs are the best solution to this especially due to frequent need of task modification/deletion. The requirement is for linux machine.

One soln could be: Create an API to read all the tasks stored in DB to execute the python script timely and call that API after every few minutes via crontab.

But I am looking for a better solution. Suggestions are welcome.

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