gefjon

SpacetimeDB is not Open Source Software. It is "source-available," but is a commercial product.

> If you have a middleware layer as you are describing, it's written in a real programming language with all the adjacent tools (source control, debugging, etc).

This is very much the point of SpacetimeDB. We write stored procedures in Rust or C# (or theoretically, any language that compiles to WASM), and we get all the same developer tools we're used to.

> There's no performance advantage.

There very much is a performance advantage to executing WASM in-process compared to communicating over an IPC barrier or, god forbid, a network.

Are you familiar with any existing ECS implementations which expose a SQL interface?