Is it possible to delay the execution of a task if a previously scheduled instance of the same task (or maybe any chosen task) is still running?

[DeeeeLAN]

I use celery to process some raw data and load it into the database every day. On some occasions, the execution of the task takes far longer than typical. There are also instances where I kick the task off manually, outside of the usual schedule. In either instance, there are times where the current running instance overlaps with the scheduled start of the same task, and they end up stepping on each other in the database.

I could probably handle this outside of celery easy enough, just add a table to the database with a flag that indicates if I am currently processing or not, then update that when I start and end a job, and wait for it if it is already set. But before I go that route, is this possible through beat?