Discord account Linkage, penalty update

packages/database/prisma/schema/user.prisma

@@ -68,7 +68,6 @@ model User {
     duplicateReason       String?                 @map(name: "duplicate_reason")
     // relations:
     oauthTokens           OAuthToken[]
-    discordAccounts       DiscordAccount[]
     participants          Participant[]
     EventAppointmentUser  EventAppointment[]      @relation("EventAppointmentUser")
     EventAppointment      EventAppointment[]
@@ -86,13 +85,26 @@ model User {
     CreatedPenalties      Penalty[]               @relation("CreatedPenalties")
     Bookings              Booking[]
 
+    DiscordAccount        DiscordAccount?
+    FormerDiscordAccounts FormerDiscordAccount[]
+
     @@map(name: "users")
 }
 
+model FormerDiscordAccount {
+    discordId String   @unique @map(name: "discord_id")
+    userId    String   @map(name: "user_id")
+    removedAt DateTime @default(now()) @map(name: "removed_at")
+
+    DiscordAccount DiscordAccount? @relation(fields: [discordId], references: [discordId], onDelete: SetNull)
+    User           User            @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+    @@id([discordId, userId])
+}
+
 model DiscordAccount {
     id           Int      @id @default(autoincrement())
     discordId    String   @unique @map(name: "discord_id")
-    userId       String   @map(name: "user_id")
     email        String   @map(name: "email")
     username     String   @map(name: "username")
     avatar       String?  @map(name: "avatar")
@@ -104,8 +116,10 @@ model DiscordAccount {
     createdAt    DateTime @default(now()) @map(name: "created_at")
     updatedAt    DateTime @default(now()) @map(name: "updated_at")
 
-    // relations:
-    user User @relation(fields: [userId], references: [id], onDelete: Cascade) // Beziehung zu User
+    // Related User
+    userId               String?               @unique
+    User                 User?                 @relation(fields: [userId], references: [id], onDelete: SetNull)
+    formerDiscordAccount FormerDiscordAccount?
 
     @@map(name: "discord_accounts")
 }