Do you know a database or file manager for users plugin? [on hold]

I save a lot of data for some clients in Excel files (currently working on exporting this as sql records). I need to have this databases (1 database per client) stored on my wordpress web so my clients can access the site with an username and password and to some queries so they can download reports from the data they selected. Is there any plugin out there that has this kind of functionality? I've found some file-managers for specific users, but a sql queries system would be way more useful. The users would be created by me as no new users can register to the site, it's only for current clients, I could create the databases needed. Any suggestions? Thanks a lot!