acta

https://github.com/whoojemaflip/acta

Acta ships a small, opinionated set of primitives for event-driven and event-sourced Rails applications: events, handlers, projections, reactors, and commands. Projections run synchronously inside the emit transaction; reactors fan out via ActiveJob. ActiveModel-backed payloads with support for nested models and ActiveRecord piggyback. SQLite and Postgres adapters.