diff --git a/.gitignore b/.gitignore
index 4b56acf..7e0eb9f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,10 +37,8 @@ lerna-debug.log*
 
 # dotenv environment variable files
 .env
-.env.development.local
-.env.test.local
-.env.production.local
-.env.local
+.env.*
+!.env.example
 
 # temp directory
 .temp
@@ -54,3 +52,6 @@ pids
 
 # Diagnostic reports (https://nodejs.org/api/report.html)
 report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Prisma client (regenerated by `prisma generate`, run on npm install)
+/prisma/generated/
diff --git a/prisma/customObjects/prisma.custom.object.ts b/prisma/customObjects/prisma.custom.object.ts
new file mode 100644
index 0000000..2574315
--- /dev/null
+++ b/prisma/customObjects/prisma.custom.object.ts
@@ -0,0 +1,4 @@
+import { Prisma } from '../generated/client';
+
+/** Product loaded with its versions (`include: { versions: true }`). */
+export type ProductWithVersions = Prisma.ProductGetPayload<{ include: { versions: true } }>;
diff --git a/prisma/migrations/migration_lock.toml b/prisma/migrations/migration_lock.toml
new file mode 100644
index 0000000..044d57c
--- /dev/null
+++ b/prisma/migrations/migration_lock.toml
@@ -0,0 +1,3 @@
+# Please do not edit this file manually
+# It should be added in your version-control system (e.g., Git)
+provider = "postgresql"
diff --git a/prisma/prisma.module.ts b/prisma/prisma.module.ts
new file mode 100644
index 0000000..7207426
--- /dev/null
+++ b/prisma/prisma.module.ts
@@ -0,0 +1,9 @@
+import { Global, Module } from '@nestjs/common';
+import { PrismaService } from './prisma.service';
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {}
diff --git a/prisma/prisma.service.ts b/prisma/prisma.service.ts
new file mode 100644
index 0000000..347e9d8
--- /dev/null
+++ b/prisma/prisma.service.ts
@@ -0,0 +1,20 @@
+import { Injectable, OnModuleDestroy, OnModuleInit } from '@nestjs/common';
+import { PrismaClient } from './generated/client';
+import { PrismaPg } from '@prisma/adapter-pg';
+
+/** Prisma client shared by the whole app (global PrismaModule), connected to `DATABASE_URL` through the pg driver adapter. */
+@Injectable()
+export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
+  constructor() {
+    const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL });
+    super({ adapter });
+  }
+
+  async onModuleInit() {
+    await this.$connect();
+  }
+
+  async onModuleDestroy() {
+    await this.$disconnect();
+  }
+}
diff --git a/prisma/schema.prisma b/prisma/schema.prisma
new file mode 100644
index 0000000..a682abd
--- /dev/null
+++ b/prisma/schema.prisma
@@ -0,0 +1,216 @@
+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+// Get a free hosted Postgres database in seconds: `npx create-db`
+
+generator client {
+  provider = "prisma-client"
+  output   = "./generated/"
+}
+
+datasource db {
+  provider = "postgresql"
+}
+
+/// Product category, mirrored from Hiboutik. Categories form a tree (parent / children).
+model Category {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  /// Enabled in the Hiboutik POS (category_enabled)
+  enabled    Boolean @default(true)
+  hiboutikId Int     @unique
+  name       String
+  /// Display order among its siblings (category_position)
+  position   Int     @default(0)
+  /// Displayed on the website (category_enabled_www)
+  webEnabled Boolean @default(true)
+
+  /// Null for a root category
+  parent   Category?  @relation("CategoryTree", fields: [parentId], references: [id], onDelete: SetNull)
+  parentId String?
+  children Category[] @relation("CategoryTree")
+
+  products Product[]
+
+  @@map("categories")
+}
+
+/// Product brand, mirrored from Hiboutik.
+model Brand {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  enabled    Boolean @default(true)
+  hiboutikId Int     @unique
+  name       String
+
+  products Product[]
+
+  @@map("brands")
+}
+
+/// Product supplier, mirrored from Hiboutik.
+model Supplier {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  enabled    Boolean @default(true)
+  hiboutikId Int     @unique
+  name       String
+
+  products Product[]
+
+  @@map("suppliers")
+}
+
+/// Product mirrored from Hiboutik. What is actually sold is one of its versions (sizes).
+model Product {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  /// Archived in Hiboutik (product_arch)
+  archived          Boolean   @default(false)
+  barcode           String?
+  description       String
+  /// Null when the product has no discount
+  discountPrice     Decimal?  @db.Decimal(10, 2)
+  /// Displayed on the website (product_display_www)
+  enabled           Boolean   @default(true)
+  /// Sum of the available stock of all its versions
+  globalStock       Int       @default(0)
+  hiboutikId        Int       @unique
+  /// Last update in Hiboutik
+  hiboutikUpdatedAt DateTime?
+  name              String
+  price             Decimal   @db.Decimal(10, 2)
+
+  brand      Brand?    @relation(fields: [brandId], references: [id], onDelete: SetNull)
+  brandId    String?
+  category   Category? @relation(fields: [categoryId], references: [id], onDelete: SetNull)
+  categoryId String?
+  supplier   Supplier? @relation(fields: [supplierId], references: [id], onDelete: SetNull)
+  supplierId String?
+
+  versions ProductVersion[]
+
+  @@map("products")
+}
+
+/// Sellable version of a product: one per Hiboutik size, or a single one (hiboutikSizeId 0) for a product without sizes.
+model ProductVersion {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  /// Not unique: Hiboutik is the source of truth and may hold the same barcode on several products
+  barcode        String?
+  /// Size-specific discount, null when none
+  discountPrice  Decimal? @db.Decimal(10, 2)
+  /// Hiboutik size id, 0 for a product without sizes
+  hiboutikSizeId Int
+  /// Size-specific price, null to use the product price (copy of the product price for a product without sizes)
+  price          Decimal? @db.Decimal(10, 2)
+  stock          Int      @default(0)
+  /// Size name, or the product name for a product without sizes
+  versionName    String
+
+  product   Product @relation(fields: [productId], references: [id], onDelete: Cascade, onUpdate: Restrict)
+  productId String
+
+  orderLines OrderLine[]
+
+  @@unique([productId, hiboutikSizeId])
+  @@index([barcode])
+  @@map("productVersions")
+}
+
+/// Customer mirrored from Hiboutik.
+model Customer {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  dateOfBirth       DateTime?
+  /// Kept when removed in Hiboutik (an empty Hiboutik email does not erase it)
+  email             String?
+  firstName         String
+  hiboutikId        Int       @unique
+  /// Last update in Hiboutik
+  hiboutikUpdatedAt DateTime?
+  lastName          String
+  phone             String?
+
+  addresses CustomerAddress[]
+  orders    Order[]
+
+  @@index([email])
+  @@map("customers")
+}
+
+/// Address of a customer, mirrored from Hiboutik (sync not implemented yet).
+model CustomerAddress {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  address    String
+  city       String
+  country    String
+  hiboutikId Int     @unique
+  isDefault  Boolean @default(false)
+  zipCode    String
+
+  customer   Customer @relation(fields: [customerId], references: [id], onDelete: Cascade)
+  customerId String
+
+  @@map("customer_addresses")
+}
+
+/// Where an order was placed.
+enum OrderSource {
+  STORE // hiboutik
+  WEB // site
+}
+
+/// Order placed in store (Hiboutik sale) or on the website.
+model Order {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  createdAt      DateTime    @default(now())
+  /// Null for a website order not (yet) sent to Hiboutik
+  hiboutikSaleId Int?        @unique
+  orderedAt      DateTime
+  source         OrderSource
+  status         String
+  total          Decimal     @db.Decimal(10, 2)
+
+  /// Null for an anonymous sale or a deleted customer
+  customer   Customer? @relation(fields: [customerId], references: [id], onDelete: SetNull)
+  customerId String?
+
+  lines OrderLine[]
+
+  @@map("orders")
+}
+
+/// Line of an order.
+model OrderLine {
+  id        String   @id @default(uuid())
+  updatedAt DateTime @updatedAt
+
+  // Snapshot of the product at order time: the catalog can change or be deleted afterwards
+  barcode           String?
+  hiboutikProductId Int
+  hiboutikSizeId    Int
+  productName       String
+  quantity          Int
+  unitPrice         Decimal @db.Decimal(10, 2)
+  versionName       String
+
+  order            Order           @relation(fields: [orderId], references: [id], onDelete: Cascade)
+  orderId          String
+  // Link to the current catalog, set to null when the version is deleted
+  productVersion   ProductVersion? @relation(fields: [productVersionId], references: [id], onDelete: SetNull)
+  productVersionId String?
+
+  @@map("order_lines")
+}
diff --git a/prisma7.config.ts b/prisma7.config.ts
new file mode 100644
index 0000000..20471ec
--- /dev/null
+++ b/prisma7.config.ts
@@ -0,0 +1,14 @@
+// This file was generated by Prisma, and assumes you have installed the following:
+// npm install --save-dev prisma dotenv
+import 'dotenv/config';
+import { defineConfig } from 'prisma/config';
+
+export default defineConfig({
+  schema: 'prisma/schema.prisma',
+  migrations: {
+    path: 'prisma/migrations',
+  },
+  datasource: {
+    url: process.env['DATABASE_URL'],
+  },
+});