just in case similar to myself early adopters of c10 - though I fiddled with upgrade of c9 -> c10 (which worked) - see this/similar. I have had:
-> $ dnf module list WARNING: modularity is deprecated, and functionality will be removed in a future release of DNF5. Last metadata expiration check: 0:02:36 ago on Thu 09 Oct 2025 18:12:35 BST. @modulefailsafe Name Stream Profiles Summary postgresql 16 [e] client, server PostgreSQL server and client module
Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled
fix: reset that module for it was empty and seems to supersede 'repos' thanks, L.