Unless you're crawling really text heavy content, most of the WARC data is binary content that doesn't really need to be in a db. However, sqlite or database as replacement for CDX is an appealing option, where WARC files can remain static data at rest and derived data (offests, full-text search, can be put into a db.
We are experimenting with a new format, WACZ, which bundles WARC files into a ZIP, while adding CDXJ and exploring sqlite as an option for full-text search. I agree that it's better to build on solid, existing formats that can be validated, especially when large amounts of data are concerned!
Although I'd absolutely welcome some sort of channel!
https://github.com/topics/crawling https://github.com/topics/web-scraping https://github.com/topics/web-archiving
Sqlite has an amazing set of well-understood and documented guarantees on top of performance, there's a host of potential validation tools to choose from and you can even use transactions etc. So that alone seems like a great idea.
What's more, you can potentially skip CDX files if you have sqlite databases (or build your own meta sqlite database for the others quickly).