/// The persistence backend the service runs against.
///
/// The executable picks a driver at startup and hands it to ``Service``, which registers the matching database as the default one. Repositories resolve
/// that default and stay agnostic of which backend is in use.
public enum Driver: Sendable {

    /// A PostgreSQL server, reached with the given connection parameters.
    ///
    /// - Parameter configuration: the host, credentials, TLS posture, and pooling limits the connection is opened with.
    case postgres(Configuration)

    /// An ephemeral, in-process SQLite database held entirely in memory.
    ///
    /// Nothing is written to disk, and all data is lost when the service stops — intended for local development and tests.
    case inMemory

}