Revalidation Pipeline

Flow

1. Change detected (signal, command, or manual call).
2. urls = urls_for(tags)
3. Purge URLs on CDN (optional).
4. warmup_url(url) enqueued per URL.

Warmup

• Sends GET <url> with header X-Edge-ISR-Warmup: 1.
• Middleware/View recomputes and updates headers/graph.

Queues

• inline (dev), celery, rq. Configure via EDGE_ISR["QUEUE"].

Commands

```bash python manage.py revalidate_tags post:42 category:7 python manage.py warm_url https://example.com/post/42/