Add SQL query for average cost retrieval and generate TriggerLog model

prisma/migrations/20251211153929_init/migration.sql

@@ -0,0 +1,21 @@
+/*
+  Warnings:
+
+  - The primary key for the `Stock_Balance` table will be changed. If it partially fails, the table could be left without primary key constraint.
+  - You are about to drop the column `ProductId` on the `Stock_Balance` table. All the data in the column will be lost.
+  - Added the required column `inventoryId` to the `Stock_Balance` table without a default value. This is not possible if the table is not empty.
+  - Added the required column `productId` to the `Stock_Balance` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE `Stock_Balance` DROP PRIMARY KEY,
+    DROP COLUMN `ProductId`,
+    ADD COLUMN `inventoryId` INTEGER NOT NULL,
+    ADD COLUMN `productId` INTEGER NOT NULL,
+    ADD PRIMARY KEY (`productId`);
+
+-- AddForeignKey
+ALTER TABLE `Stock_Balance` ADD CONSTRAINT `Stock_Balance_productId_fkey` FOREIGN KEY (`productId`) REFERENCES `Products`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;
+
+-- AddForeignKey
+ALTER TABLE `Stock_Balance` ADD CONSTRAINT `Stock_Balance_inventoryId_fkey` FOREIGN KEY (`inventoryId`) REFERENCES `Inventories`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;