File manager
This local web app is to collect file information and store them in local SQLite. Then we can browse those files without visiting the file system.
We can set a disk as RAID1 disk. We then can check whether some files in a given folder are duplicated with files on such RAID1 disk, and provide options to delete such tripple-duplicated files.
We use a field "is_raid1" in SQLite "disk" table to indicate whether a disk is RAID1 or not.
SQLite3 Syntax Link: https://sqlite.org/doclist.html Django model migration: https://docs.djangoproject.com/en/2.0/topics/migrations/