FEAT: BaseDataItem class

add TODO comments for future improvements
FIX: Remove effect field on template
FIX: remove unused DhpEffects file

module/data/items/base.mjs

@@ -0,0 +1,32 @@
+/**
+ * @typedef {Object} ItemDataModelMetadata
+ * @property {String} type - System type that this type data model represents
+ * @property {Boolean} hasDescription
+ */
+
+const fields = foundry.data.fields;
+
+export default class BaseDataItem extends foundry.abstract.TypeDataModel {
+  /** @returns {ItemDataModelMetadata}*/
+  static get metadata() {
+    return {
+      label: "Base Item",
+      type: "base",
+      hasDescription: false,
+      isQuantifiable: false
+    };
+  }
+
+  /** @inheritDoc */
+  static defineSchema() {
+    const schema = {};
+
+    if (this.metadata.hasDescription)
+      schema.description = new fields.HTMLField({ required: true, nullable: true });
+
+     if (this.metadata.isQuantifiable)
+      schema.quantity = new fields.NumberField({ integer: true, initial: 1, min: 0, required: true });
+
+    return schema;
+  }
+}