# commanded/eventstore

Event store using PostgreSQL for persistence

Repository: https://github.com/commanded/eventstore
Canonical: https://ross.abutalabs.com/products/eventstore
Language: Elixir
License: MIT
License Family: permissive
Topics: cqrs, eventstore, elixir, event-sourcing, postgresql, database, cqrs-es, commanded
Last push: 2026-05-04T19:18:03+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 80, release rhythm 28, longevity 100
- inputs: {"age_days": 3845, "days_push": 121, "days_rel": 545, "gap_med": 55, "n_releases_24m": 4}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1162, forks 155 (observed 2026-08-28T04:03:49.527509+00:00)

## What it is
An event store library for Elixir that uses PostgreSQL as its underlying persistence engine. It supports appending and reading event streams, subscriptions, and running on a cluster of nodes.

## Use cases
- implement event sourcing in an Elixir application
- store append-only event streams in PostgreSQL
- build a CQRS system with Elixir
- subscribe to events from an event stream
- run an event store across a cluster of nodes

## When to choose
- you're building an Elixir app with event sourcing or CQRS
- you want to use PostgreSQL as your event store instead of a dedicated event store database
- you need persistent or transient subscriptions to event streams

## When to avoid
- you're not using Elixir or the BEAM ecosystem
- you need a standalone event store server like EventStoreDB or Kafka
- your persistence model doesn't fit append-only event streams

## Facets
- artifact type: library
- maturity: active
- function: database, serialization, message-queue
- domain: databases, backend, developer-tools
- platform: elixir, windows
- tags: event-sourcing, cqrs, eventstore, postgresql, elixir, event-streaming, subscriptions, linux, macos

## Member repositories
- commanded/eventstore (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:49.527509+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:31:37.723099+00:00, confidence not recorded.
  - readme: https://github.com/commanded/eventstore (fetched 2026-08-28T04:03:49.527509+00:00, sha 63c2cb40168d)
- Data as of 2026-08-30T08:39:29.467469+00:00.