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[Makc666]

When user register his account and he uses Latin symbols,
then his name will go to SQL base as 1 symbol registration to 1 symbol in SQL.

When user register his account and he uses NONE Latin symbols,
then his name will go to SQL base as 1 symbol registration to 2 symbol in SQL.

That mean that automatically his username is divided by 2.
And will be not 25 symbols but 12 symbols.

Why not chage user_name varchar(25) by default to bigger value???