The latest release recorded for dgraph-io/badger is v4.9.6. Badger is an embedded persistent key-value database implemented in pure Go. You can embed the store inside a Go program without running a separate network server. The provided repository information contains no description of what changed in this version and no release notes, so the specific changes in v4.9.6 cannot be confirmed.
Badger is the underlying database of Dgraph and was designed as an alternative to non-Go key-value stores such as RocksDB. The key point is that it is a store that can be embedded directly in a Go program. According to the README summary, it targets fast performance and supports concurrent ACID transactions. Those transactions provide serializable snapshot isolation (SSI). It also ships a Badger CLI for offline backup and restore. The repository's implementation language is Go, and the license is Apache-2.0.
The repository's creation time is recorded as 2017-01-26T05:09:49Z, and the star count is 15,796. The provided information contains no performance benchmark figures and lists no fixes for v4.9.6. What can be confirmed is therefore limited to the project's role and its documented features. Whether this release improved performance or stability cannot be judged from this information alone.