I will write it as a memorandum.
I was returning too much with "Command + z".
After deploying heroku open When I launched the browser with, it is not reflected for some reason. So, just in case, I checked it on the local host first. Then, the code I should have written disappeared. It seems that it disappeared because it returned too much with "Command + z".
Due to such a mistake, I spent an hour pushing and migrating barren time, so let's check it carefully before proceeding.
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