Queen MQ

What it does

Open-source message queue on PostgreSQL with per-entity FIFO ordering at any cardinality, transactional enqueue inside a PG transaction, replay-from-timestamp, dead-letter queue, JWT auth, Vue 3 dashboard. Five SDKs (JS, Python, Go, PHP, C++). Apache 2.0. One Docker container.

A message queue on the PostgreSQL you already run: one ordered FIFO lane per entity, consumer groups, replay, a dead-letter queue and a dashboard, in one binary.

You can offload most of your complex application logic to Queen. Queen is a message broker written in Rust that keeps every byte of its state in PostgreSQL. Its defining abstraction is one logical ordered partition per application entity , a customer, an account, a conversation, a device, a workflow, a session or a job, created by the first push that names it and never provisioned in advance. Most brokers give you ordering per shard . Your requirement is ordering per entity : this customer's events processed in order, this conversation's messages not overtaking each other, this account's transactions settling in sequence. Bridging the two is where the pain lives. Hash your entities onto a…from queenmq.com

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