feat: add product variant management functionality

- Implemented CreateProductVariantDto and UpdateProductVariantDto for product variant data transfer.
- Developed ProductVariantsController to handle CRUD operations for product variants.
- Created ProductVariantsService to interact with the database using Prisma.
- Added ProductVariantsModule to encapsulate the product variant feature.
- Included response mapping for consistent API responses.

prisma/migrations/20251206102502_init/migration.sql

@@ -0,0 +1,83 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `alertQuantity` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `attachmentId` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `discount` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `imageUrl` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `isActive` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `isFeatured` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `productInfoId` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `quantity` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `unit` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the `Product_info` table. If the table is not empty, all the data it contains will be lost.
+  - Made the column `createdAt` on table `Products` required. This step will fail if there are existing NULL values in that column.
+  - Made the column `updatedAt` on table `Products` required. This step will fail if there are existing NULL values in that column.
+
+*/
+-- DropForeignKey
+ALTER TABLE `Product_info` DROP FOREIGN KEY `Product_info_brandId_fkey`;
+
+-- DropForeignKey
+ALTER TABLE `Product_info` DROP FOREIGN KEY `Product_info_categoryId_fkey`;
+
+-- DropForeignKey
+ALTER TABLE `Product_info` DROP FOREIGN KEY `Product_info_supplierId_fkey`;
+
+-- DropForeignKey
+ALTER TABLE `Products` DROP FOREIGN KEY `Products_productInfoId_fkey`;
+
+-- DropIndex
+DROP INDEX `Products_productInfoId_fkey` ON `Products`;
+
+-- AlterTable
+ALTER TABLE `Products` DROP COLUMN `alertQuantity`,
+    DROP COLUMN `attachmentId`,
+    DROP COLUMN `discount`,
+    DROP COLUMN `imageUrl`,
+    DROP COLUMN `isActive`,
+    DROP COLUMN `isFeatured`,
+    DROP COLUMN `productInfoId`,
+    DROP COLUMN `quantity`,
+    DROP COLUMN `unit`,
+    ADD COLUMN `brandId` INTEGER NULL,
+    ADD COLUMN `categoryId` INTEGER NULL,
+    ADD COLUMN `metaData` JSON NULL,
+    ADD COLUMN `productType` VARCHAR(50) NULL DEFAULT 'simple',
+    MODIFY `createdAt` TIMESTAMP(0) NOT NULL DEFAULT CURRENT_TIMESTAMP(0),
+    MODIFY `updatedAt` TIMESTAMP(0) NOT NULL;
+
+-- DropTable
+DROP TABLE `Product_info`;
+
+-- CreateTable
+CREATE TABLE `Product_Variants` (
+    `id` INTEGER NOT NULL AUTO_INCREMENT,
+    `name` VARCHAR(255) NOT NULL,
+    `basePrice` DECIMAL(10, 2) NOT NULL,
+    `salePrice` DECIMAL(10, 2) NOT NULL,
+    `description` TEXT NULL,
+    `barcode` VARCHAR(100) NULL,
+    `imageUrl` VARCHAR(255) NULL,
+    `unit` VARCHAR(10) NULL,
+    `quantity` DECIMAL(10, 2) NULL DEFAULT 0.00,
+    `alertQuantity` DECIMAL(10, 2) NULL DEFAULT 5.00,
+    `isActive` BOOLEAN NOT NULL DEFAULT true,
+    `isFeatured` BOOLEAN NOT NULL DEFAULT false,
+    `createdAt` TIMESTAMP(0) NULL,
+    `updatedAt` TIMESTAMP(0) NULL,
+    `deletedAt` TIMESTAMP(0) NULL,
+    `productId` INTEGER NOT NULL,
+
+    UNIQUE INDEX `products_barcode_unique`(`barcode`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- AddForeignKey
+ALTER TABLE `Product_Variants` ADD CONSTRAINT `Product_Variants_productId_fkey` FOREIGN KEY (`productId`) REFERENCES `Products`(`id`) ON DELETE RESTRICT ON UPDATE NO ACTION;
+
+-- AddForeignKey
+ALTER TABLE `Products` ADD CONSTRAINT `Products_brandId_fkey` FOREIGN KEY (`brandId`) REFERENCES `Product_brands`(`id`) ON DELETE SET NULL ON UPDATE NO ACTION;
+
+-- AddForeignKey
+ALTER TABLE `Products` ADD CONSTRAINT `Products_categoryId_fkey` FOREIGN KEY (`categoryId`) REFERENCES `Product_categories`(`id`) ON DELETE SET NULL ON UPDATE NO ACTION;

prisma/migrations/20251206102601_init/migration.sql

@@ -0,0 +1,10 @@
+/*
+  Warnings:
+
+  - You are about to drop the column `metaData` on the `Products` table. All the data in the column will be lost.
+  - You are about to drop the column `productType` on the `Products` table. All the data in the column will be lost.
+
+*/
+-- AlterTable
+ALTER TABLE `Products` DROP COLUMN `metaData`,
+    DROP COLUMN `productType`;