django.db.utils.DataError: (1406, “Data too long for column ‘username‘ at row 1“)

django.db.utils.DataError: (1406, “Data too long for column ‘username’ at row 1”) 用户首页配置好，输入用户名点击修改 错误提示：DataError 1406“Data too long for column ‘username’ at row 1” 返回用户首页配置，重新输入用户名，点击修改， 未报错，这里的长度限制

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