Summary
Vercel added Postgres connectivity support to Sandbox even when outbound access is controlled by its firewall. The change removes a practical blocker for agentic and sandboxed workflows that need live database access without punching broad network holes.
What changed
Vercel updated Sandbox so Postgres connections can work through the firewall when the database host is explicitly allowed.
Why it matters
Secure sandboxed execution becomes much more useful once it can talk to real stateful systems without dropping its network controls. This strengthens Vercel's position as an agent-ready runtime, not just a frontend hosting platform.
Evidence excerpt
Vercel's May 1 changelog states that Sandbox can now connect to hosted Postgres databases through the firewall when the host is added to allowed domains.