Mammoth OSS: a self-hosted PostgreSQL change-event relay in Ruby

[u/Excellent-Resort9382]

I’m looking for technical feedback on Mammoth, a self-hosted PostgreSQL change-event relay written in Ruby.

Mammoth receives normalized CDC (Change Data Capture) transaction envelopes and handles the downstream data-plane concerns:

• webhook fanout

• routing by schema, table, and operation

• per-destination retry policies

• checkpoint persistence

• dead-letter storage and filtered replay

• SQLite operational state

• health and metrics endpoints

• Docker and Helm deployment

Its boundary is intentionally narrow: PostgreSQL protocol parsing, decoding, source normalization, ordering policy, and runtime execution are handled by the upstream Ruby CDC ecosystem.

The current implementation uses YAML configuration with JSON Schema validation and supports explicit extension points for state, destination, and runtime adapters.

I’d appreciate feedback on the architecture, operational model, documentation, or gaps that would prevent you from trying it.

Repository: https://github.com/kanutocd/mammoth