Pre-publication research artifact

Postern: a Lean-verified access gateway for agentic data lakehouses

Plan-level rewriting against a column-grant policy. The Lean rewriter is sorry-free; a Rust mirror runs the same logic; a conformance harness keeps them byte-equal on a hand-curated JSON corpus. The Datalog evaluator and Biscuit-Datalog dispatch are in progress.

Read the paper Download PDF Open slides ↗ Try the rewriter (WASM)

8-slide overview

Use arrow keys / swipe to navigate. The deck is also live at /slides for full-screen viewing.

Where things live

paper/paper.md — the paper (Pandoc markdown).
verifier/lean/Postern.lean — the proven rewriter theorems.
verifier/lean/Datalog.lean — Datalog eval (3 theorems stated, sorries open).
prototype/crates/postern-core — Rust mirror of the rewriter.
prototype/crates/postern-wasm — the WASM surface this site loads.
scenarios/financial-institution — the policy + demo data shape.