* New: Automatically adds performance indexes to the session activity table so recommendation rebuilds run far faster on large stores.
* New: Large stores are offered a safe, one-click background optimization (via Action Scheduler) instead of blocking wp-admin; smaller stores are optimized automatically on update.
* New: "Database Optimization" status and controls on the Maintenance tab, plus a `wp wc_recommender_optimize` WP-CLI command for running the optimization off-peak.
