Persistence-aligned Type System

Every Vantage persistence defines its own type trait — SqliteType, PostgresType, SurrealType, MongoType, CsvType — that maps Rust values to and from the storage format. This is how expressions like sqlite_expr!("price > {}", 150i64) know how to bind 150i64 as a parameter.

Built-in implementations cover the common ground: bool, i64, f64, String, Option<T>, chrono date/time types, and more. Each persistence supports exactly the types its backend can handle natively.

Because the trait is open, you can implement it for your own types — enums, newtypes, domain objects — and they’ll work everywhere expressions are used: conditions, inserts, updates.

See Adding Custom Types for a walkthrough.