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...thread doesn''t actually use any Rails-type classes, Rails theoretical lack of thread-safety should be irrelevant, right? This should work fine. Correct me if I''m wrong. But the next part is---what if the Thread does need to use ActiveRecord. Am I asking for trouble? Should I make _copies_ of my individual ActiveRecord instances to give to the thread, to make sure my background thread isn''t operating on the very same ActiveRecord object that a Rails thread (or another background thread might be?)? Or is this not necessary? Anything else I should be worried about? In genera...