Upvoting because you're struggling with a faceless megacorp.
> how we use the username (we save it against a user model in our database)
But what are you doing with that data? If I got that explanation, I'd ask again too. From what you wrote, I have no idea why you use IG, why you even need usernames, and definitely not how they are used after they are saved against other data.
> how we use the username (we save it against a user model in our database)
But what are you doing with that data? If I got that explanation, I'd ask again too. From what you wrote, I have no idea why you use IG, why you even need usernames, and definitely not how they are used after they are saved against other data.