import of csv file with "not" as fieldname gives DB error

It's trivial, but it can be annoying if encountered and it's easy to fix, just add an extra _.
It might also occur with other reserved MySQL words.

Sorry. A non-recoverable error has occurred.

DB Error: syntax error

Database Error Code: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'not text, contact text, phone_ text, email text, add' at line 1, 1064"
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