...

prisma/migrations/20260203113111_set_username_unique/migration.sql

@@ -0,0 +1,12 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[username]` on the table `user` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- AlterTable
+ALTER TABLE "user" ADD COLUMN     "displayUsername" TEXT,
+ADD COLUMN     "username" TEXT;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "user_username_key" ON "user"("username");

prisma/schema.prisma

@@ -1,3 +1,4 @@
+
 generator client {
   provider = "prisma-client"
   output   = "../generated/prisma"
@@ -21,8 +22,12 @@ model User {
   dictionaryLookUps    DictionaryLookUp[]
   translationHistories TranslationHistory[]
 
+  username        String?
+  displayUsername String?
+
   @@unique([email])
   @@map("user")
+  @@unique([username])
 }
 
 model Session {