The nixpkgs-unstable channel's programs.sqlite was used to identify packages producing exactly one binary, and these automatically added to their package definitions wherever possible.
> Actually, no. I am no longer using IRC and thereby konversation. https://github.com/NixOS/nixpkgs/pull/180595#issuecomment-1178683153
1.7.7 from october 2020 was the last version before Konversation adapted the KDE Gear versioning schema, so move and thus update it accordingly.