Version 0.2.0

[teodordelibasic-db]

What changes are proposed in this pull request?

• Upgrade to Rust SDK v0.4.0
• Add new non-blocking ingest APIs (ingestRecordOffset, ingestRecordsOffset, waitForOffset)
• Add experimental Arrow Flight support (not supported by server, feature flag)
• Fix user agent to zerobus-sdk-ts/0.2.0
• Reorganize examples into json/, proto/, arrow/ directories

Benchmark Results

Rough benchmarking results against a local server for 1M records:

Record Size	TS SDK	Rust SDK	Overhead
~100 bytes	44K rec/s	50K rec/s	12%
1 KB	29K rec/s	50K rec/s	72%
2 KB	25K rec/s	48K rec/s	94%

Why the gap widens with larger records

NAPI-RS requires copying buffers from JS to Rust:

let vec: Vec<u8> = buffer.to_vec();

The Rust SDK needs Vec<u8> ownership for async gRPC. A future optimization would change the Rust SDK to accept bytes::Bytes, enabling zero-copy:

// Zero-copy possible with Bytes
let bytes = Bytes::from(buffer.as_ref());

How is this tested?

• Unit tests pass
• Integration tests pass
• Examples work