Datamodel + Appv2 migration, WIP

module/models/feature.mjs

@@ -0,0 +1,22 @@
+/**
+ * Data model for Feature items
+ */
+export default class BoLFeatureDataModel extends foundry.abstract.TypeDataModel {
+  static defineSchema() {
+    const fields = foundry.data.fields;
+    const requiredInteger = { required: true, nullable: false, integer: true };
+    
+    return {
+      // Base fields
+      category: new fields.StringField({ initial: null }),
+      subtype: new fields.StringField({ initial: "default" }),
+      description: new fields.HTMLField({ initial: "" }),
+      properties: new fields.SchemaField({}),
+      
+      // Feature-specific fields
+      rank: new fields.NumberField({ ...requiredInteger, initial: 0 })
+    };
+  }
+
+  static LOCALIZATION_PREFIXES = ["BOL.Feature"];
+}