Honker: A SQLite extension adding Postgres-style pub/sub, queues, and event streams

Summary

Honker is a SQLite loadable extension that adds PostgreSQL-style NOTIFY/LISTEN semantics to SQLite, enabling durable pub/sub messaging, task queues, and event streams without requiring client polling or a separate daemon/broker. It achieves cross-process wake latency of ~0.7ms p50 on M-series laptops and works as a plain SQLite extension accessible from any language that can load it. Bindings exist for Python, Node, Rust, Go, Ruby, Bun, and Elixir, all sharing a single on-disk format. The project highlights that SQLite is increasingly used in production systems like Bluesky's PDS, Fly's LiteFS, and Turso.