fixed so the code compiles

prisma/migrations/20260526183414_username_required/migration.sql

@@ -0,0 +1,21 @@
+/*
+  Warnings:
+
+  - Made the column `username` on table `User` required. This step will fail if there are existing NULL values in that column.
+
+*/
+-- Backfill: assign a unique username derived from email or googleId for rows with NULL username
+UPDATE "User"
+SET "username" = lower(regexp_replace(split_part("email", '@', 1), '[^a-zA-Z0-9_]', '', 'g'))
+WHERE "username" IS NULL;
+
+-- Ensure uniqueness by appending a suffix for any collisions
+UPDATE "User" u
+SET "username" = u."username" || '_' || substr(u."id", 1, 6)
+WHERE (
+  SELECT COUNT(*) FROM "User" u2
+  WHERE u2."username" = u."username" AND u2."id" != u."id"
+) > 0;
+
+-- AlterTable
+ALTER TABLE "User" ALTER COLUMN "username" SET NOT NULL;