@sebastian that's awesome, great you could figure it out!
The Package_Versions field is supposed to be some kind of range specifier (e.g. something like [3.4.4-3.4.4.8), but I don't know format offhand). However, we've also never seen it in the wild in any dataset. It's always just a CSV of versions.
Regarding licensing, that information is not really in the database. It's parsed from the manifest file (e.g. .nuspec) in the front-end. That file is stored in database, but it's practical to use in SQL. We talked about building a kind of job that would normalize that into a PackageLicenses table, and then allow custom reporting (or show how a consumer is using it).
At some point, we'd love to get a copy of your data (database backup if possible) so we can see some real-world consumers/consumption and build some pages from it. We do have some sort of idea in PRoGet how to make this look/work better, but seeing real data would be helpful. That development won't start until Q2, so maybe we'll reach out in a month or so and ask :)