Update Giveaway, app-functional

prisma/migrations/20250428111616_giveaway_update3/migration.sql

@@ -0,0 +1,3 @@
+-- AlterTable
+ALTER TABLE "Giveaway" ADD COLUMN     "duration" INTEGER,
+ADD COLUMN     "endsAt" TIMESTAMP(3);

prisma/schema.prisma

@@ -64,6 +64,8 @@ model Giveaway {
   prize       String
   active      Boolean  @default(true)
   createdAt   DateTime @default(now())
+  duration    Int?
+  endsAt      DateTime? 
   entryCost   Int      @default(7000000)
   entries     Entry[]
 }