Following the instruction from the book Practical Event Sourcing with Scala by Denis Kalinin.

This is an application which experiments with the Event Sourcing Pattern.

Instead of implementing the traditional CRUD functionality through exposed APIs which directly act on a database, here we implement consumers and producers. These services publish events to Kafka and consume and act on them asynchronously.

Additionally, relevant backend state changes are propagated to the frontend through Server-Sent Events instead of being updated through traditional polling endpoints.

• Backend uses Play 2.8
• Kafka as messaging and persistence layer
• Akka Streams Kafka client
• React Frontend is served directly from Play
• Users are stored in Postgres
• Events are also being persisted to Postgres for querying purposes
• JSON as message serialization

$ cd stack && docker compose up
$ cd ui && npm run watch
$ sbt run