How to change sqlite database schema?

Questions and Answers Database-SQL
1
System Information
  • Strapi Version: v3.6.2
  • Operating System: Windows 10
  • Database: sqlite
  • Node Version: v14.16.1
  • NPM Version: 6.14.12
  • Yarn Version: -

Hello, I want to remove username as UNIQUE constraint. because we are storing user’s name in username field and we want that user name can be same for multiple user.