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ccn/Packages/Persistence/Sources/Public/Enumerations/Driver.swift
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/// 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 MySQL/MariaDB server, reached with the given connection parameters.
///
/// - Parameter configuration: the host, credentials, TLS posture, and pooling limits the
/// connection is opened with.
case mysql(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
}