Answer: This would be a hybrid tea on a high graft to form the tree shape. The graft is not very cold hardy, so you do need to protect it from extreme cold just as you did. Since it is in a container you might consider putting it on a roller tray (or dolly or child's wagon) and taking it in and out each day so that it can get a head start on the sunshine but still be protected from freezing nights. Next year, you might set it outside a bit earlier to try to keep it from leafing out so early -- just let it "wake up" naturally with the season. As it is now, you will need to gradually acclimate it to the outdoors so it won't sunburn. Pruning would follow, to some extent, normal hybrid tea pruning rules in that a hard pruning results in larger but fewer flowers, prune out any diseased or damaged stems, thin to allow for some air flow at the interior, and then finally for shape. Enjoy your rose!
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