Why My Unique Index Doesn't Work in Postgresql?

Why My Unique Index Doesn’t Work in Postgresql?
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(stackoverflow.com/users/16348516/icsarisakal)icsarisakal
(stackoverflow.com/users/732248/iurii-tkachenko)Iurii Tkachenko
(stackoverflow.com/users/256196/bohemian)Bohemian
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