generator client {
  provider = "prisma-client-js"
}
datasource db {
  provider = "mysql"
  url = env("DATABASE_URL")
}
model User {
  id String @id @default(uuid()) @db.Char(36)
  username String @unique @db.VarChar(64)
  passwordHash String @db.VarChar(255)
  baseCurrency String @default("CNY") @db.Char(3)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
  positions Position[]
  rates ExchangeRate[]
  sessions Session[]
}
model Session {
  id String @id @db.Char(64)
  userId String @db.Char(36)
  user User @relation(fields:[userId],references:[id],onDelete:Cascade)
  expiresAt DateTime
  @@index([userId])
}
model Position {
  id String @id @default(uuid()) @db.Char(36)
  importedFromId String? @db.Char(36)
  userId String @db.Char(36)
  user User @relation(fields:[userId],references:[id],onDelete:Cascade)
  kind String @db.VarChar(16)
  side String @db.VarChar(16)
  name String @db.VarChar(100)
  category String @db.VarChar(40)
  currency String @db.Char(3)
  notes String @db.Text
  archived Boolean @default(false)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
  revisions Revision[]
  outgoing PositionLink[] @relation("Source")
  incoming PositionLink[] @relation("Target")
  @@index([userId,kind])
  @@unique([userId,importedFromId])
}
model Revision {
  id String @id @default(uuid()) @db.Char(36)
  sequence Int @unique @default(autoincrement())
  positionId String @db.Char(36)
  position Position @relation(fields:[positionId],references:[id],onDelete:Cascade)
  amount Decimal @db.Decimal(24,8)
  effectiveDate DateTime @db.Date
  notes String @db.Text
  reason String @db.VarChar(20)
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
  @@index([positionId,effectiveDate])
}
model PositionLink {
  id String @id @default(uuid()) @db.Char(36)
  sourceId String @db.Char(36)
  targetId String @db.Char(36)
  source Position @relation("Source",fields:[sourceId],references:[id],onDelete:Cascade)
  target Position @relation("Target",fields:[targetId],references:[id],onDelete:Cascade)
  @@unique([sourceId,targetId])
}
model ExchangeRate {
  id String @id @default(uuid()) @db.Char(36)
  userId String @db.Char(36)
  user User @relation(fields:[userId],references:[id],onDelete:Cascade)
  currency String @db.Char(3)
  baseCurrency String @db.Char(3)
  date DateTime @db.Date
  rate Decimal @db.Decimal(24,12)
  source String @db.VarChar(30)
  @@unique([userId,currency,baseCurrency,date])
}