feat: add generated code

backend/prisma/schema.prisma

@@ -0,0 +1,78 @@
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+enum MovementKind {
+  Receipt
+  Issue
+  Transfer
+  Adjustment
+}
+
+model ProductType {
+  id        String    @id @default(uuid())
+  name      String    @unique
+  products  Product[]
+  createdAt DateTime  @default(now())
+  updatedAt DateTime  @updatedAt
+
+  @@map("product_types")
+}
+
+model Product {
+  id            String              @id @default(uuid())
+  name          String
+  productType   ProductType         @relation(fields: [productTypeId], references: [id])
+  productTypeId String
+  parent        Product?            @relation("ProductHierarchy", fields: [parentId], references: [id])
+  parentId      String?
+  children      Product[]           @relation("ProductHierarchy")
+  stockStatus   StockStatus?
+  lines         StockMovementLine[]
+  createdAt     DateTime            @default(now())
+  updatedAt     DateTime            @updatedAt
+
+  @@map("products")
+}
+
+model StockStatus {
+  product   Product  @relation(fields: [productId], references: [id])
+  productId String   @id @unique
+  quantity  Decimal  @default(0)
+  inStock   Boolean  @default(false)
+  updatedAt DateTime @default(now()) @updatedAt
+
+  @@map("stock_statuses")
+}
+
+model StockMovement {
+  id           String              @id @default(uuid())
+  documentDate DateTime            @db.Date
+  kind         MovementKind
+  lines        StockMovementLine[]
+  comment      String?
+  createdAt    DateTime            @default(now())
+  updatedAt    DateTime            @updatedAt
+
+  @@map("stock_movements")
+}
+
+model StockMovementLine {
+  id         String        @id @default(uuid())
+  product    Product       @relation(fields: [productId], references: [id])
+  productId  String
+  quantity   Decimal
+  inStock    Boolean
+  movement   StockMovement @relation(fields: [movementId], references: [id])
+  movementId String
+  createdAt  DateTime      @default(now())
+  updatedAt  DateTime      @updatedAt
+
+  @@unique([movementId, productId])
+  @@map("stock_movement_lines")
+}