Cache invalidation

Delivery caches at three layers: in-memory LRU → Redis → DB. The Redis pub/sub channel scaicms:cache:invalidate carries invalidation messages from backend to delivery.

"I changed content and the site is still stale"#

1. Check the worker is running. Index writes are queued, not synchronous. ps aux | grep scaicms-worker.
2. Check the channel. In one terminal: redis-cli PSUBSCRIBE 'scaicms:cache:invalidate'. Then change the content. You should see a message.
3. Manual flush. As a hammer:
   scdocCopy

   1 2	redis-cli FLUSHDB redis-cli PUBLISH scaicms:cache:invalidate "site:<site-id>:*"

"I uploaded a new template pack but pages still use the old one"#

Pack uploads invalidate the pack cache but not all content. Run the manual flush above or restart the delivery process.

"I updated my JWT secret"#

JWTs from before the change are now invalid — delivery and backend both reject them. Sign out and sign back in.