What happened to my user name 10 years ago

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The free service sagenb.org had to be taken down because the model was insecure enough that spammers were taking advantage of published worksheets. Some public worksheets are slowly being worked through in the hopes of publishing as public SageMathCloud worksheets. I believe some database somewhere still may have your information but you'd have to contact the old administrator, who happens to be the new administrator of https://cloud.sagemath.com.