Comment by AlchemistCamp

My advice since you’re focused on simplified texts in the PRC is to make sure it doesn’t suck for vertically written traditional characters.

Having watched Chinese-learning apps for a long time, a common failure mode is treating traditional characters as an afterthought, when it’s actually a lot cleaner to use them as a base. simplified variants were made so that readers of traditional characters could easily make the switch, but the reverse is not true. If your db treats “face” and “noodle” or “wind” and “typhoon” as the same character from the beginning, it’s a lot harder to separate later.