Actually you can avoid having a separate DB! You can build a materialized view of the data using [KTables](https://developer.confluent.io/courses/kafka-streams/

Actually you can avoid having a separate DB! You can build a materialized view of the data using [KTables](https://developer.confluent.io/courses/kafka-streams/ktable/ https://developer.confluent.io/courses/kafka-streams/ktable/) or use [interactive queries](https://developer.confluent.io/courses/kafka-streams/interactive-queries/ https://developer.confluent.io/courses/kafka-streams/interac...). The "table" is built up from a backing kafka topic so you don't need maintain another datastore if the data view you want is entirely derived from one or more Kafka topics.