$ 7000 . It has an MMR 4 . 75 L built motor with a ton of goodies and only 18 k on that motor and the rebuilt transmission . It fucking flys . <| sep |> No , I think your thing is a great idea , but it in no way will replace the way CQRS and event sourcing is done , because the benefits that people seek through event sourcing are not resolved by your approach . Your approach is basically a single database with a richer language for generating materialized views in the scope of that database . Also it ' s not just about heterogeneous technologies . It ' s also about ability to change your model without losing your domain events history , about an audit trail written as events described in the domain language , and about temporal lookups of the state of the system i . e . ability to step back into the state of the system , or query , say , what was the state yesterday at 630 PM .