More database support

[m-fariz-a]

I want to deploy this app in production system so that all my user can access their data via filebrowser instead of sftp client like filezilla. But I do not see any documentatiom about sql database integration (mysql, mariadb, postgresql). Of course there are some cases that sftp client is more suitable but for casual user, using fllebrowser perhaps will be more intuitive.

With this kind of support, it'll make admin easier to import the list of users that will be registered.