feat: place holder stock aggregate

src/inventory/domain/mod.rs

@@ -5,7 +5,7 @@
 // aggregates
 pub mod category_aggregate;
 pub mod product_aggregate;
-//pub mod stock_aggregate;
+pub mod stock_aggregate;
 pub mod store_aggregate;
 
 // commands

src/inventory/domain/stock_aggregate.rs

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use derive_builder::Builder;
+use derive_getters::Getters;
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+use super::product_aggregate::Quantity;
+
+// stock keeping unit
+// TODO: will implement later, have to figure out how to print SKU label and during billing.
+#[derive(
+    Clone, Debug, Serialize, Deserialize, Eq, PartialEq, Ord, PartialOrd, Builder, Getters,
+)]
+pub struct SKU {
+    id: String,
+    product_id: Uuid,
+    expiry: Option<OffsetDateTime>,
+    sold: bool,
+    quantity: Quantity,
+}