Naming is the most difficult part

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FreeViruses on May 31st, 2019 at 22:35 UTC »

Then the next one can be j;

discobrisco on May 31st, 2019 at 23:00 UTC »

Oh that's easy. child201910

betrok on May 31st, 2019 at 23:12 UTC »

Just generate a UUID so you will have a very small chance of collision without any synchronization.