AWS Releases ExtendDB, a DynamoDB-Compatible Server That Stores Items in PostgreSQL

On May 20, 2026, two members of the DynamoDB team published ExtendDB, an Apache 2.0 server that implements the DynamoDB wire protocol. Applications using standard DynamoDB SDKs connect to it, while items are actually kept in ordinary PostgreSQL tables that can be inspected directly. The project is written in Rust and is described by its maintainers as a clean-room implementation, currently at the 0.1 development stage. The author walks through a Docker Compose setup, user and access-key creation, and pointing the AWS CLI at a local endpoint. The release is explicitly labeled not a replacement for DynamoDB.