I’m trying to navigate into schema and tables but I wasn’t able to find tables related to schema . Do you know what is the actual name of that table. I did create users already . I know that they are persisted somewhere but I wasn’t able to find that table 
There is no such thing as “user table”. Like many things in XWiki users are wiki pages with specific metadata. You can find in https://extensions.xwiki.org/xwiki/bin/view/Extension/Query%20Module#HQueryLanguageExamples examples of database queries manipulating users.
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