Although PUT Response is 200 OK, the MySQL Database contains missing or null data.

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This indicates that there is an issue with the data being sent to the database, which is resulting in missing or null values. The PUT request was successful in that it was able to reach the database and update the data, but the data itself is incomplete or incorrect. The issue could be with the formatting of the data or with the validation rules set up in the database. The next step is to investigate the cause of the issue and correct the data in the database.