Added the catalogue models and seed to support phase 5 of the POC prototype in the Persistence package.

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

@@ -0,0 +1,30 @@
+import FluentKit
+
+/// Adds the seller kind and the business registration to shops.
+///
+/// Registered ahead of ``SeedCatalogue``, whose model writes the columns. One column per update: SQLite adds no more in a statement.
+struct AddShopRegistration: AsyncMigration {
+
+    // MARK: Constants
+
+    private static let columns = ["kind", "kvk_number", "vat_id", "legal_name"]
+
+    // MARK: Methods
+
+    func prepare(on database: Database) async throws {
+        for column in Self.columns {
+            try await database.schema(ShopRecord.schema)
+                .field(.string(column), .string)
+                .update()
+        }
+    }
+
+    func revert(on database: Database) async throws {
+        for column in Self.columns.reversed() {
+            try await database.schema(ShopRecord.schema)
+                .deleteField(.string(column))
+                .update()
+        }
+    }
+
+}