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db-branch: Instant database branches for AI agents and CI via ZFS

·2026.11.15 22:50

Key point

The Apache-2.0 tool creates copy-on-write branches for MySQL and PostgreSQL in seconds, supporting AI agent sandboxes and CI workflows.

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Details

  • db-branch is a self-hosted, open-source tool (Apache-2.0) that creates instant copy-on-write database branches for MySQL and PostgreSQL using ZFS clones.
  • On a 3-node test cluster, PostgreSQL branches are ready in about 0.5 seconds and MySQL branches in about 3 seconds, with 0 bytes copied at creation.
  • The tool includes a built-in MCP server that allows LLM agents to create, query, and delete branches, enabling safe execution of risky queries or migrations without touching production data.
  • It supports per-branch version upgrades, checkpoints, and automatic expiration via TTL, with a Raft cluster option for high availability and ProxySQL routing.
  • The project is currently in Beta status, meaning APIs and command-line details may change before the 1.0 release; it requires Ubuntu 24.04 or 26.04 LTS and a ZFS pool.
databaseopen-sourceinfrastructureai-agentsci-cdzfs
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