fix(stats): make unique users migration idempotent

packages/stats/core/package.json

@@ -17,6 +17,7 @@
   },
   "scripts": {
     "db:generate": "drizzle-kit generate --config=drizzle.config.ts",
+    "db:ensure-unique-users": "bun src/ensure-unique-users.ts",
     "db:migrate": "bun src/migrate.ts",
     "db:push": "drizzle-kit push --config=drizzle.config.ts",
     "db:studio": "drizzle-kit studio --config=drizzle.config.ts",