[Author here] I think you can use what you want, as long as it's not a dozen moving parts - meaning several databases. Postgres has the benefit of good caching

[Author here] I think you can use what you want, as long as it's not a dozen moving parts - meaning several databases. Postgres has the benefit of good caching, good pub/sub, good Json document support, basic but often good enough fulltext search and a good columnar store with TimescaleDB.