Then there's Jekyll, which is not exactly dead but definitely moribund. It seems to be blocked by GitHub's refusal to support further development and upgrade to the 4.x releases.
The broadcast companies that have been selling air time to K4K for two decades should be held accountable for misleading advertising. Oh wait, the broadcasters own the US Congress and federal regulators. Never mind.
I'm staying away from macOS Tahoe for now. NetNewsWire has already announced that they will no longer support the earlier 6.x release that I use. I assume that means no bug fixes or back-porting of new features. Sad.
I admire what you are doing. It obviously serves you well and you hope it helps others.
I'm familiar with how to import CSV data with SQLite and I could probably learn how to do it with DuckDB with ease. Your tool introduces a new and rather shallow abstraction layer with commands that work for both databases.
The world needs tools that provide a great deal of utility, are trustworthy, and keep getting more reliable and capable. I'm not sure that yours will qualify.