migration: add matrix variants schema migration

apps/backend/prisma/migrations/20260624220800_add_matrix_variants/migration.sql

@@ -0,0 +1,20 @@
+-- DropIndex
+DROP INDEX "ProductVariant_productId_size_key";
+
+-- AlterTable
+ALTER TABLE "Product" ADD COLUMN     "options" JSONB DEFAULT '[]';
+
+-- AlterTable
+ALTER TABLE "ProductVariant" DROP COLUMN "size",
+ADD COLUMN     "barcode" TEXT,
+ADD COLUMN     "option1" TEXT NOT NULL DEFAULT '',
+ADD COLUMN     "option2" TEXT NOT NULL DEFAULT '',
+ADD COLUMN     "option3" TEXT NOT NULL DEFAULT '',
+ADD COLUMN     "sku" TEXT,
+ADD COLUMN     "stock" INTEGER NOT NULL DEFAULT 0;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ProductVariant_sku_key" ON "ProductVariant"("sku");
+
+-- CreateIndex
+CREATE UNIQUE INDEX "ProductVariant_productId_option1_option2_option3_key" ON "ProductVariant"("productId", "option1", "option2", "option3");