feat: add ability to like books

api/prisma/schema.prisma

@@ -178,6 +178,7 @@ model User {
   updatedAt    DateTime     @updatedAt
   comments     Comment[]
   suggestions  Suggestion[]
+  likes        Like[]
 }
 
 model Comment {
@@ -226,6 +227,8 @@ enum AuditAction {
   ENTRY_CREATE
   ENTRY_UPDATE
   ENTRY_DELETE
+  LIKE
+  UNLIKE
   USER_BAN
   USER_UNBAN
   RATE_LIMIT_EXCEEDED
@@ -275,3 +278,14 @@ enum SuggestionStatus {
   ACCEPTED
   DECLINED
 }
+
+model Like {
+  id           String    @id @default(auto()) @map("_id") @db.ObjectId
+  userId       String    @db.ObjectId
+  user         User      @relation(fields: [userId], references: [id])
+  entityType   String    // 'book', 'game', 'show', 'manga', 'music', 'art'
+  entityId     String    @db.ObjectId
+  createdAt    DateTime  @default(now())
+
+  @@unique([userId, entityType, entityId])
+}