Initial commit.

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 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
+
+}