Comment by 542458
This might be a dumb question (as I'm not familiar with constraint solvers) but would a linear optimization approach be better? I've used linear optimization for scheduling in the past. The nice thing is that linear optimization handles rule conflicts well, because you just set weights on all your rules and the optimizer will find the "least bad" solution to the conflicts.
This is what major sports leagues use for season scheduling (source: https://mathstodon.xyz/@j2kun/108975072813565989)