Complete Transportation data model

module/models/Item/Transportation.mjs

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+import { DescribedItemData } from "./DescribedItemData.mjs";
+
+export class TransportationItemData extends DescribedItemData {
+	static defineSchema() {
+		const fields = foundry.data.fields;
+		return mergeObject(super.defineSchema(), {
+			single_trip: new fields.NumberField({
+				initial: null,
+				nullable: true,
+			}),
+			purchase: new fields.NumberField({
+				initial: null,
+				nullable: true,
+			}),
+			upkeep: new fields.NumberField({
+				initial: null,
+				nullable: true,
+			}),
+			can_be_in_inventory: new fields.BooleanField({
+				initial: false,
+			}),
+			inventory_slots: new fields.NumberField({
+				initial: 0,
+				min: 0,
+			}),
+			logon_bonus: new fields.NumberField({
+				initial: null,
+				nullable: true,
+			})
+		});
+	};
+};