```release-note:feature
**Add PebbleDB Storage Backend**: This storage backend is a non-HA, durable backend using PebbleDB for transactions and improved performance.
```
```release-note:change
command/server: Remove `file` storage backend support.
```
```release-note:deprecation
command: The `file` storage backend is deprecated for `bao operator migrate` and will be removed in v2.8.0.
```
```release-note:improvement
sdk/physical: Replace `inmem` backend with ephemeral PebbleDB instance.
```
