changelog: Update changelog for stats PR.

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Performance
+
+- **Reduced Redis round-trips on the Stats page channel status endpoint.** `get_basic_channel_info` was making up to 6 individual `HGET` calls per connected client plus a redundant `HGET` for `TOTAL_BYTES` (already present in the preceding `HGETALL` result). Client metadata is now fetched with a single `HMGET` per client, and `TOTAL_BYTES` is read from the already-fetched hash. Under load with many active streams this significantly reduces the time each uWSGI worker holds the GIL servicing the stats endpoint, reducing the chance of concurrent requests from other pages timing out with a 503. The same `HGET`-to-`HMGET` consolidation was applied to `stream_ts` and `get_user_active_connections`. The Stats page frontend was also fixed to fire the initial fetch only once on mount (previously two `useEffect` hooks both triggered an immediate fetch on load). — Thanks [@JCBird1012](https://github.com/JCBird1012)
+
 ### Fixed
 
 - **Restoring a backup from an older version left the database with missing schema.** The restore task ran `pg_restore` which replaced the entire database (including the `django_migrations` table) but did not run migrations afterward. If the backup predated a schema migration, the restored database was missing tables and columns added by those migrations, causing 500 errors on every API call. `migrate --noinput` now runs automatically after every restore. The success notification also now recommends a restart to clear stale service state.