Feat(booking-job): Prioritise older booking

backend/internal/ktmtrainbot/backgroundbookingjob.go

@@ -59,11 +59,13 @@ func (env *Env) BackgroundJobRunner() {
 			err = tx.Model(&jobToDo).
 				Where("user_id NOT IN (?)", userIDArr).
 				Where("status = ?", "pending").
+				Order("created_at asc").
 				Preload("User").
 				First(&jobToDo).Error
 		} else {
 			err = tx.Model(&jobToDo).
 				Where("status = ?", "pending").
+				Order("created_at asc").
 				Preload("User").
 				First(&jobToDo).Error
 		}