wip(freight): migration 0017 + model/column-list groundwork for add-freight-templates

apps/api/src/models.rs

@@ -110,6 +110,8 @@ pub struct Sku {
     pub price_minor: i64,
     pub currency: String,
     pub stock: i32,
+    /// Grams per unit for by-weight freight; null lines contribute zero weight.
+    pub weight_grams: Option<i32>,
     pub active: bool,
 }
 
@@ -175,6 +177,8 @@ pub struct Order {
     pub discount_minor: i64,
     /// Authoritative sum of completed after-sale refunds.
     pub refund_total_minor: i64,
+    /// Server-computed per-shop-order shipping fee.
+    pub shipping_fee_minor: i64,
     /// The coupon this order redeemed, if any.
     pub coupon_id: Option<Uuid>,
     /// Group-buying activity this order joined, if any.
@@ -198,6 +202,9 @@ pub struct OrderItem {
     pub qty: i32,
     /// Set when this line received flash-sale pricing.
     pub flash_sale_item_id: Option<Uuid>,
+    /// Freight template + pricing method snapshotted at checkout.
+    pub freight_template_id: Option<Uuid>,
+    pub freight_pricing_method: Option<FreightPricingMethod>,
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Type)]
@@ -230,6 +237,14 @@ impl AftersaleStatus {
     }
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Type)]
+#[sqlx(type_name = "freight_pricing_method", rename_all = "snake_case")]
+#[serde(rename_all = "snake_case")]
+pub enum FreightPricingMethod {
+    ByPiece,
+    ByWeight,
+}
+
 #[derive(Debug, Clone, Serialize, sqlx::FromRow)]
 pub struct Shipment {
     pub id: Uuid,