Remove user_migration scripts

[brianhelba]

These were added by #59, to migrate users from Girder to Django.

[brianhelba]

Looking at the production DANDI database, there are only 7 remaining placeholder users:

select * from auth_user where email LIKE 'placeholder_%';

Since the users need to login to convert their placeholder account, I believe none of the 7 have logged in since the migration was added in April 2021. Could we just delete the 7 user accounts in question?

[mvandenburgh]

Unfortunately, some of those users are owners of dandisets. For example, https://dandiarchive.org/dandiset/000004 contains one of those placeholder users as an owner.

[brianhelba]

Could we keep that one (or all) of the users in the database, but fix their email addresses and give them a totally random password? That will keep referential integrity in the database.

If those users ever come back after 5 years, they can just do a reset password operation (or sign in with GitHub, if it returns the same email).

I don't know how reset password actually works on DANDI, but I am aware that some of the active users don't have linked social accounts, so they must be logging in somehow.

[jjnesbitt]

I don't know how reset password actually works on DANDI, but I am aware that some of the active users don't have linked social accounts, so they must be logging in somehow.

I think all of those users are site staff/admins. The login page only gives the option for Github.

Since this is a very small number of users, and they probably have no intention of logging into dandi anytime soon (if ever, since they've not logged in since 2021), I wonder if we can simply send all of these users an email, stating something along the lines of "Please login or your account will be deleted", giving some time-frame like 2 weeks or so. As long as those users aren't the sole owner of a dandiset, then it will be relatively straightforward from our end. At least for the dandiset linked above, there is another owner on that dandiset.

[dandibot]

🚀 PR was released in v0.21.0 🚀