Added the catalogue models and seed to support phase 2 of the POC prototype in the Persistence package.

Packages/Persistence/Tests/Utils/Methods/WithDatabase.swift

@@ -0,0 +1,27 @@
+import HummingbirdFluent
+import Logging
+
+@testable import Persistence
+
+/// Runs the body against a migrated, seeded in-memory database, shutting the pool down after — even on failure, or the pool asserts on `deinit`.
+func withDatabase(
+    _ body: (Fluent) async throws -> Void
+) async throws {
+    let fluent = try Service(
+        driver: .inMemory,
+        logger: Logger(label: "test")
+    )()
+
+    do {
+        await PrepareDB()(for: fluent)
+
+        try await fluent.migrate()
+        try await body(fluent)
+    } catch {
+        try? await fluent.shutdown()
+
+        throw error
+    }
+
+    try await fluent.shutdown()
+}