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  1. Free hosting have phpMyAdmin. If you cannot access it please see Unable to access phpMyAdmin.
  2. Removing a reference from your PHP code doesn’t mean it doesn’t exist in the database. In fact, the error message makes me think that it is exactly because you don’t refer to the column in PHP, the database always receive an empty value for the email, and thus raise the constraint violation.
  3. Your inquiry is way too out of scope for the community forum. We won’t and cannot fix your code for you.
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