Ark
There are too many files in `models/migrations` folder so that I split them into sub folders.
* Remove unused commit * a small nit Signed-off-by: a1012112796 <1012112796@qq.com> Co-authored-by: a1012112796 <1012112796@qq.com>
* move SaltGeneration into HashPasswort and rename it to what it does * Migration: Where Password is Valid with Empty String delete it * prohibit empty password hash * let SetPassword("") unset pwd stuff