Write a spec covering the race condition during group deletion.
- Use multiple threads / database connections to: 1. Escape the transaction the spec seems to be running in (`config.use_transactional_fixtures` is off, but `ActiveRecord::Base.connection.open_transactions` is not empty at the beginning of the spec. 2. Simulate a Sidekiq worker performing the hard delete outside of the soft-delete transaction. - The spec is a little clunky, but it was the smallest thing I could get working - and even this took a couple of hours. Let me know if you have any suggestions to improve it!
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