1) yes.
2)
Initially, the server swore just 504 error
here began strangely. I torment server and he started to make logins starting with numbers (in my case 23_username). If I remember correctly the events that I have included authorization via email, then all registered accounts (via database) feature that checks the mailbox user. Users began to start, then disabled authorization via email, but the server continued to let users.
Actually I have two questions. Why API missed creating not correct (according to the registration form) by the user and whether the access is blocked by such people buduyuschih updates.
I have such a 10k users (again due to the fact that the API missed their creation :()
If you can write a few days API team which I enjoyed (with a set of similar values)
Q. I only have one that I do now. 
I can not forcibly make polzovatley change logins on the website to kotomu integrates the chat I forbade create usernames beginning with numbers, but what to do with the subject who is already registered ... this ... 95% of users suspected 15k accounts.
If the API will add a ban on the creation, but the entrance to the incorrect accounts that will have such an option is completely satisfied.
And how do you deal with the accounts of the blood pressure which can also locality starting with a digit?