- SATN is the message format for serializing the types in our type system: SATS (Spacetime Algebraic Type System). We need a new algebraic type system to abstra

- SATN is the message format for serializing the types in our type system: SATS (Spacetime Algebraic Type System). We need a new algebraic type system to abstract over all the different module language type systems that we support in the database. We need a unified way to represent data types in the database. - Yes they can be replicated! Although at the moment they are not, we'll definitely have log replication by the time we launch our mainnet cloud product.