refactor: Rearrange schema

prisma/schema.prisma

@@ -42,22 +42,29 @@ model Track {
   id         Int            @id @default(autoincrement())
   title      String
   objectKey  String
-  versions   TrackVersion[]
+
   producer   User           @relation(fields: [producerId], references: [id], onDelete: Cascade)
   producerId String
+
+  versions   TrackVersion[]
 }
 
 model TrackVersion {
   id       Int       @id @default(autoincrement())
+
   track    Track     @relation(fields: [trackId], references: [id], onDelete: Cascade)
   trackId  Int
+
   comments Comment[]
 }
 
 model Comment {
   id             Int          @id @default(autoincrement())
+  content        String
+
   author         User         @relation(fields: [authorId], references: [id])
   authorId       String
+
   trackVersion   TrackVersion @relation(fields: [trackVersionId], references: [id], onDelete: Cascade)
   trackVersionId Int
 }