Queen MQ

A message queue that turns Postgres into Kafka + RabbitMQ

Open Source

GitHub

Tech

Database

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Hi PH! 👋 I'm Alice from Smartness, and we're launching Queen MQ today after running it in production for 7 months. The short version: Queen MQ is an open-source message queue that runs on PostgreSQL and gives you unlimited ordered partitions per queue: per chat, per user, per workflow, per whatever, without preallocating anything. One Docker container, plus the Postgres you already have. Why we built it. We run Smartchat, an AI guest-messaging platform with 100 000+ concurrent chat conversations. Each chat needs strict FIFO ordering across translate, retrieve, reply steps. We tried Kafka with 32, then 1 000 partitions; one slow conversation kept blocking 3 000 others sharing the same hash bucket. We tried RabbitMQ at one queue per chat; couldn't sustain 100k queues. pg-boss and pgmq are libraries, not brokers. So we built Queen and ran billion messages through the benchmark suite with zero loss. What you get out of the box: • Per-entity FIFO ordering at any cardinality (10 to 100 000+ partitions, no preallocation) • Atomic enqueue inside a PG transaction (transactional outbox built in) • Consumer groups with replay from any timestamp • Lease-based delivery, retries, DLQ • Five SDKs: JavaScript, Python, Go, PHP / Laravel, C++ • Vue 3 dashboard, Prometheus metrics, JWT auth • One stateless C++ binary + your Postgres Try it in 30 seconds: docker network create queen docker run --name qpg --network queen -e POSTGRES_PASSWORD=postgres -p 5433:5432 -d postgres docker run -p 6632:6632 --network queen -e PG_HOST=qpg -e PG_PASSWORD=postgres smartnessai/queen-mq:latest And go to localhost:6632