feat(prisma): define models for Url, Property, Item, ItemProperty, SelectedProperty, and DeletedProperty

prisma/schema.prisma

@@ -8,5 +8,91 @@ generator client {
 
 datasource db {
   provider = "sqlite"
-  url      = env("DATABASE_URL")
+  url      = "file:./dev.db"
 }
+
+// URLs table - Each comparison page has its own URL
+model Url {
+  id        Int      @id @default(autoincrement())
+  url       String   @unique
+  createdAt DateTime @default(now()) @map("created_at")
+
+  // Relations
+  items              Item[]
+  selectedProperties SelectedProperty[]
+  deletedProperties  DeletedProperty[]
+
+  @@map("urls")
+}
+
+// Properties table - All available properties (core + custom)
+model Property {
+  id               Int @id @default(autoincrement())
+  name             String @unique
+  globalUsageCount Int @default(0) @map("global_usage_count")
+
+  // Relations
+  itemProperties     ItemProperty[]
+  selectedProperties SelectedProperty[]
+  deletedProperties  DeletedProperty[]
+
+  @@map("properties")
+}
+
+// Items table - Individual items that can appear in multiple URLs
+model Item {
+  id           String  @id
+  urlId        Int     @map("url_id")
+  wikidataId   String? @map("wikidata_id")
+  itemOrder    Int     @default(0) @map("item_order")
+  globalItemId String  @unique @map("global_item_id")
+
+  // Relations
+  url               Url               @relation(fields: [urlId], references: [id], onDelete: Cascade)
+  itemProperties    ItemProperty[]    @relation("ItemToItemProperty")
+  deletedProperties DeletedProperty[]
+
+  @@map("items")
+}
+
+// Junction table for item properties (including core properties like name, description)
+model ItemProperty {
+  globalItemId String @map("global_item_id")
+  propertyId   Int    @map("property_id")
+  value        String
+
+  // Relations
+  item     Item     @relation("ItemToItemProperty", fields: [globalItemId], references: [globalItemId], onDelete: Cascade)
+  property Property @relation(fields: [propertyId], references: [id], onDelete: Cascade)
+
+  @@id([globalItemId, propertyId])
+  @@map("item_properties")
+}
+
+// Selected properties for each URL (excludes core properties)
+model SelectedProperty {
+  urlId      Int @map("url_id")
+  propertyId Int @map("property_id")
+
+  // Relations
+  url      Url      @relation(fields: [urlId], references: [id], onDelete: Cascade)
+  property Property @relation(fields: [propertyId], references: [id], onDelete: Cascade)
+
+  @@id([urlId, propertyId])
+  @@map("selected_properties")
+}
+
+// Soft delete tracking for properties per URL
+model DeletedProperty {
+  urlId        Int    @map("url_id")
+  globalItemId String @map("global_item_id")
+  propertyId   Int    @map("property_id")
+
+  // Relations
+  url      Url      @relation(fields: [urlId], references: [id], onDelete: Cascade)
+  item     Item     @relation(fields: [globalItemId], references: [globalItemId], onDelete: Cascade)
+  property Property @relation(fields: [propertyId], references: [id], onDelete: Cascade)
+
+  @@id([urlId, globalItemId, propertyId])
+  @@map("deleted_properties")
+}