Added the catalogue models and seed to support phase 1 of the POC prototype in the Persistence package.

Packages/Persistence/Sources/Internal/Migrations/CreateListing.swift

@@ -0,0 +1,46 @@
+import FluentKit
+
+/// Creates and drops the `listings` table backing ``ListingRecord``.
+struct CreateListing: AsyncMigration {
+
+    // MARK: Methods
+
+    func prepare(on database: Database) async throws {
+        try await database.schema(ListingRecord.schema)
+            .id()
+            .field("shop_id", .uuid, .required, .references(ShopRecord.schema, "id", onDelete: .cascade))
+            .field("slug", .string, .required)
+            .field("title", .string, .required)
+            .field("series_title", .string, .required)
+            .field("issue_label", .string, .required)
+            .field("publisher", .string, .required)
+            .field("year", .int, .required)
+            .field("format", .string, .required)
+            .field("printing", .string, .required)
+            .field("printing_detail", .string, .required)
+            .field("is_first_print", .bool, .required)
+            .field("grader", .string)
+            .field("grade", .double)
+            .field("condition", .string, .required)
+            .field("cert_number", .string)
+            .field("page_quality", .string)
+            .field("key_notes", .string)
+            .field("seller_notes", .string, .required)
+            .field("price_cents", .int, .required)
+            .field("shipping_cents", .int, .required)
+            .field("accepts_offers", .bool, .required)
+            .field("cover_tone", .string, .required)
+            .field("cover_title", .string, .required)
+            .field("cover_imprint", .string, .required)
+            .field("cover_number", .string, .required)
+            .field("listed_at", .datetime, .required)
+            .unique(on: "slug")
+            .create()
+    }
+
+    func revert(on database: Database) async throws {
+        try await database.schema(ListingRecord.schema)
+            .delete()
+    }
+
+}