Why Background Jobs? Fetching trending videos is fast. But validating that 5,000 thumbnails still load, enriching metadata with language detection, and purging broken embeds from the database — these tasks can take minutes. Running them synchronously inside a cron job blocks the fetcher and risks timeouts. Celery with a Redis broker moves this work off the hot path. TopVideoHub uses a four-worker Celery setup to keep its 9-region video library clean without affecting fetch latency. Setup pip install celery redis requests langdetect Enter fullscreen mode Exit fullscreen mode celery_app.py : from celery import Celery app = Celery ( ' topvideohub ' , broker = ' redis://localhost:6379/0 ' , backend = ' redis://localhost:6379/1 ' , ) app . conf .…