Hangfire Restrictions

We need to enqueue up to 5000 jobs at one time and execute them during the weekends.
Half of them are succeeded, but another half is stuck on enqueued state according to logs and is absent in db.
We use Mongo db as a storage.

I have two questions related to my issue.

  1. Are there any restrictions on the number of jobs enqueued?
  2. Can scheduled and enqueued job be deleted from db?