# Changelog 2023 01 31

### Postgres extension support

Added support for the Postgres `unit` extension. For more information about Postgres extensions supported by Neon, see [Postgres extensions](/guides/postgres-extensions-pg-extensions).

### Fixes & improvements

- Compute: Removed logic that updated roles each time a Neon compute instance was restarted. Roles were updated on each restart to address a password-related backward compatibility issue that is no longer relevant.
- Pageserver: Reimplemented the layer map used to track the data layers in a branch. The layer map now uses an immutable binary search tree (BST) data structure, which improves data layer lookup performance over the previous R-tree implementation. The data required to reconstruct page versions is stored as data layers in Neon Pageservers.
- Pageserver: Changed the garbage collection (`gc`) interval from 100 seconds to 60 minutes. This change reduces the frequency of layer map locks.
- Pageserver: Implemented an asynchronous pipe for communication with the Write Ahead Log (WAL) redo process, which helps improves OLAP query performance.

## Related pages

- [AI tools for Agents](./ai-agents-on-neon-index.md)
- [APIs & SDKs](./apis-sdks-index.md)
- [Changelog](../changelog.md)
- [Integrating with Neon](./building-on-neon-index.md)
- [Lakebase Postgres](./postgres-index.md)
- [Managed Better Auth](./auth-index.md)
- [More](./more-index.md)
- [Neon AI Gateway](./ai-gateway-index.md)
- [Neon community](./community-index.md)
- [Neon documentation](./neon-docs-index.md)

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