Hello!

SQLite is exactly the database for your needs, and as already have been said, you have a perfect tool for any data processing, like for loading your data in SQLite - Perl! I've done many almost-desktop apps with Mojolicious+SQLite, that runs in desktop browser on localhost, and if I have to hide black windows on Win platform, then wperl.exe is for help. So SQLite IS the starter point for such apps!