Caching Invalidation Designer

Design a caching invalidation strategy for:

Data model: {{data_model_description}}
Cache layers: {{cache_layers}} (e.g., CDN, Redis, app-level)
Data mutation patterns: {{mutation_patterns}}
Consistency SLA: {{consistency_sla}}

Provide:
1. Invalidation trigger points (write-through, event-based)
2. TTL recommendations per cache layer
3. Partial vs. full invalidation trade-offs
4. Stale-while-revalidate approach (if applicable)
5. Stampede prevention (thundering herd)
6. Monitoring metrics (hit rate, staleness)
7. Rollback plan for incorrect invalidation

Minimize {{optimization_priority}}.