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```sql model Lesson { id String @id @default(uuid()) courseId String? course Course? @relation(fields: [courseId], references: [id]) resourceId String? resource Resource? @relation(fields: [resourceId], references: [id]) draftId String? draft Draft? @relation(fields: [draftId], references: [id]) index Int createdAt DateTime @default(now()) updatedAt DateTime @updatedAt } ```