Refactor ProductType model: Remove unused sellCostMinNeutral and sellCostMaxNeutral fields for cleaner code and improved maintainability.

backend/models/falukant/type/product.js

@@ -15,17 +15,7 @@ ProductType.init({
         allowNull: false},
     sellCost: {
         type: DataTypes.INTEGER,
-        allowNull: false}
+        allowNull: false
-    ,
-    sellCostMinNeutral: {
-        type: DataTypes.DECIMAL,
-        allowNull: true,
-        field: 'sell_cost_min_neutral'
-    },
-    sellCostMaxNeutral: {
-        type: DataTypes.DECIMAL,
-        allowNull: true,
-        field: 'sell_cost_max_neutral'
     }
 }, {
     sequelize,