🔴 Remove tools/rust_api/ (forked kuzu crate) — replace with lbug dependency

[web3guru888]

Summary

The tools/rust_api/ directory is a fork of the kuzu Rust crate (v0.11.1) that builds the Kùzu C++ source via CMake. Now that Kùzu is abandoned, this should be replaced with the lbug crate dependency.

Findings

Current State

• tools/rust_api/ contains 8 Rust source files + CMake build system
• It IS the kuzu crate (package name = "kuzu" in Cargo.toml)
• Builds Kùzu C++ source via CMake — heavy compilation, ~5 min
• Used by: examples/rust/ (path dependency)

Files to Remove/Replace

File	Lines	Purpose
tools/rust_api/Cargo.toml	Package definition
tools/rust_api/build.rs	29 refs — CMake build for C++
tools/rust_api/src/ffi.rs	31 refs — CXX bridge
tools/rust_api/src/lib.rs	14 refs — public API
tools/rust_api/src/value.rs	28 refs — value types
tools/rust_api/src/connection.rs	7 refs — connection API
tools/rust_api/src/database.rs	3 refs — database struct
tools/rust_api/src/error.rs	3 refs — error types
tools/rust_api/src/ffi/arrow.rs	4 refs — arrow bridge

Migration

1. Delete entire tools/rust_api/ directory
2. Update examples/rust/Cargo.toml: kuzu = { path = "..." } → lbug = "0.16"
3. Update example code for any API differences (~5% incompatible)
4. Remove CMake dependency from CI (faster builds!)

Benefits

• Faster CI: No more CMake + C++ compilation (~5 min saved)
• Maintenance-free: lbug crate updates via cargo update
• Smaller repo: Remove C++ build infrastructure
• Security: Published crate gets community security review

Estimated Effort

• Delete + replace: 0.5 days
• Update examples: 0.5 days
• CI cleanup: 0.5 days