Use of django signals prevents performance optimisation using bulk_{update,create} functions
In Django 2.0 a new functions were added that update multiple rows on the database in single query.
They are called bulk_update and bulk_create. On average they provide from 10000% to 25000% performance uplift.
See more details in this article: https://zerotobyte.com/using-django-bulk-create-and-bulk-update/
However, the big issue is that those function will not emit the signal hooks when they are modifying rows.
Currently there are many signals hooks defined in lava_scheduler_app/signals.py.
Maybe there is room to remove the use of django signals and replace them more direct calls to emit ZMQ signals?
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