feat: Re-compute the given items cost job.

feat: Optimize the architecture.

server/src/services/Items/ItemsService.js

@@ -3,6 +3,44 @@ import { Item } from '@/models';
 
 export default class ItemsService {
 
+  static async newItem(item) {
+    const storedItem = await Item.tenant()
+      .query()
+      .insertAndFetch({
+        ...item,
+      });
+    return storedItem;
+  }
+
+  static async editItem(item, itemId) {
+    const updateItem = await Item.tenant()
+      .query()
+      .findById(itemId)
+      .patch({
+        ...item,
+      });
+    return updateItem;
+  }
+
+  static async deleteItem(itemId) {
+    return Item.tenant()
+      .query()
+      .findById(itemId)
+      .delete();
+  }
+
+  static async getItemWithMetadata(itemId) {
+    return Item.tenant()
+      .query()
+      .findById(itemId)
+      .withGraphFetched(
+        'costAccount',
+        'sellAccount',
+        'inventoryAccount',
+        'category'
+      );
+  }
+
   /**
    * Validates the given items IDs exists or not returns the not found ones.
    * @param {Array} itemsIDs