I'm quite relief I didn't broke the build of your ~1200 packages yet
with the last CDBS uploads that removed half of the files
from this project.
From reading https://trends.debian.net/ one could come with the naive
assumption that CDBS is the old thing, dh-haskell is the new one
and some day all packages will have migrated to DebHelper.
I did.
Now, from doing extensive research on the Haskell monorepo & Debian Code Search.
I see that dh-haskell was used before but is not used anymore.
1) I think my plan of grafting the remainder of CDBS into
haskell-devscripts-minimal is do-able. I can do it without
bothering Haskell community until much later down the road
when we first cleansed remaining usage of Java/Perl/Python plugins.
2) Another possibility is automatic conversion of most of these ~1200 projects to newer DebPuty managing tool.
It's very alive not like CDBS but I don't know Niels feelings about this neither yours.
We could either choose 1 or 2, but neither involves dh-haskell;
which looks like in a dead end now.