db-branch/db-branch: Instant MySQL and PostgreSQL database branches on ZFS clones

db-branch is an open-source, self-hosted tool that creates instant copy-on-write database branches for MySQL and PostgreSQL using ZFS clones. It allows developers to test migrations, run AI agent sandboxes, or provision database copies for pull requests in seconds with zero bytes copied at creation. The tool supports clustered deployments with ProxySQL routing, a command-line interface, a REST API, and an MCP server for LLM integration. Open article →