feat: add image support to the products

apps/api/prisma/schema.prisma

@@ -59,7 +59,8 @@ model ClientUser {
   email        String   @unique
   passwordHash String
   name         String
-  role         String   @default("viewer")
+  // admin (the owner: users and terminals) | manager (runs the venue: products, stock, tabs, reminders)
+  role         String   @default("manager")
   createdAt    DateTime @default(now())
 
   venue Venue @relation(fields: [venueId], references: [id])
@@ -222,6 +223,8 @@ model TabEvent {
   items            Json?
   // stock_set: the counted stock, null to stop tracking
   stockSetTo       Int?
+  // product_created / product_updated: the product's fields as sent by the terminal
+  productData      Json?
   occurredAt       DateTime
   receivedAt       DateTime @default(now())
 
@@ -252,6 +255,12 @@ model Product {
   reportedAt        DateTime
   // Deleted on the dashboard: hidden on the terminals, kept because tabs and history refer to it
   archivedAt        DateTime?
+  imageId           String?
+  // When each field was last changed ({ name: ISO date, ... }): a change from the dashboard or an (offline)
+  // terminal only wins over a later one per field, so edits of different fields never overwrite each other
+  fieldUpdatedAt    Json?
+
+  image ProductImage? @relation(fields: [imageId], references: [id])
 
   venue Venue @relation(fields: [venueId], references: [id])
 
@@ -330,3 +339,16 @@ model Settlement {
   @@index([venueId, sequence])
   @@index([venueId, settledAt])
 }
+
+// A product picture, resized and cropped on upload. The id is the SHA-256 of the stored bytes, so the picture at
+// an address never changes and can be cached forever, and the same picture is stored once.
+model ProductImage {
+  id          String   @id
+  contentType String
+  width       Int
+  height      Int
+  bytes       Bytes
+  createdAt   DateTime @default(now())
+
+  products Product[]
+}