Enhance tags

prisma/schema.prisma

@@ -106,8 +106,27 @@ model ArtTag {
 
   description String?
 
+  aliases    ArtTagAlias[]
   artworks   Artwork[]
   categories ArtCategory[]
+
+  parentId String?
+  parent   ArtTag?  @relation("TagHierarchy", fields: [parentId], references: [id], onDelete: SetNull)
+  children ArtTag[] @relation("TagHierarchy")
+}
+
+model ArtTagAlias {
+  id        String   @id @default(cuid())
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  alias String @unique
+
+  tagId String
+  tag   ArtTag @relation(fields: [tagId], references: [id], onDelete: Cascade)
+
+  @@unique([tagId, alias])
+  @@index([alias])
 }
 
 model Color {