I would like to know how Stackoverflow and StackExchange manage pre-defined tags tags and addition of new tags. Today, I tried to define a new tag, only to be met with this error message:

Creating the new tag 'mcrouter' requires at least 300 reputation. Try something from the existing tags list instead.

I am interested to know how the data model that deals with pre-defined tags and new tags, especially dealing with the 300 count. Is the counter installed in a table? How is this achieved on the data level? Or is this done on the code level?

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    You might better ask this on one of the Meta sites because it is specific to SO/SE, not to DBA in general. – Peter B Oct 29 '18 at 8:56

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