LDEV-4507 Prevent duplicate groups with a DB constraint Lesson staff groups need to have order id different than 1 so they do not clash with…
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LDEV-4507 Prevent duplicate groups with a DB constraintLesson staff groups need to have order id different than 1 so they donot clash with learner groups.Fetch lesson learner count faster by an exact query rather than fetchingall learners with Hibernate and counting them.
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