b70f1d859d
* MM-63925 Remove most nested transactions from channel_store_categories.go There's one place which still has a nested transaction in CreateInitialSidebarCategories, but that's because it's calling out to a different part of the store. The only way to avoid that would be to break the extraction like UpdateSidebarCategories does to update preferences, but I chose not to follow that pattern here and leave it as-is. * MM-63923 Prevent deadlocks caused by updating multiple categories in a different order * MM-63923 Prevent deadlocks while deleting from SidebarChannels This could also have been resolved by sorting the categories, but combining the queries seems a bit more elegant. * MM-63924 Ensure adding SidebarChannels rows is idempotent * Add additional test to cause deadlocks * Prevent channels from appearing in a single category multiple times * Other review feedback
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