Does it make sense to create an explicit one-to-many relation?

datasource db {
  provider = "mongodb"
  url      = env("DATABASE_URL")
}

model Stage {
  id   String @id @default(auto()) @map("_id") @db.ObjectId
  cuid String @unique @default(cuid())
  name String @unique

  events StageEventsMap[]
}

model Event {
  id   String @id @default(auto()) @map("_id") @db.ObjectId
  cuid String @unique @default(cuid())
  name String

  stage StageEventsMap
}

model StageEventsMap {
  id   String @id @default(auto()) @map("_id") @db.ObjectId
  cuid String @unique @default(cuid())

  stage  Stage    @relation(fields: [stageId], references: [id])
  events Event[] @relation(fields: [eventIds], references: [id])

  stageId String @db.ObjectId
  eventIds String[] @db.ObjectId

  @@index([stageId, eventIds])
}

datasource db {
  provider = "mongodb"
  url      = env("DATABASE_URL")
}

model Stage {
  id   String @id @default(auto()) @map("_id") @db.ObjectId
  cuid String @unique @default(cuid())
  name String @unique

  events StageEventsMap[]
}

model Event {
  id   String @id @default(auto()) @map("_id") @db.ObjectId
  cuid String @unique @default(cuid())
  name String

  stage StageEventsMap
}

model StageEventsMap {
  id   String @id @default(auto()) @map("_id") @db.ObjectId
  cuid String @unique @default(cuid())

  stage  Stage    @relation(fields: [stageId], references: [id])
  events Event[] @relation(fields: [eventIds], references: [id])

  stageId String @db.ObjectId
  eventIds String[] @db.ObjectId

  @@index([stageId, eventIds])
}