This commit:
https://github.com/timpritlove/tunez/commit/811b01c605ea7e64e162e93a4b76088d84d131b4
adds the :stream strategy which somehow prevents “mix seed” from completing as it would require pagination on the default :read actions on artists and albums. changing this back to :atomics fixed this. as the commit is referring to chapter 10 I assume this might be fixed later somehow but when trying to run the seeds again while having just finished chapter 6 this change prevents me from re-seeding my database.
not sure I got all of this right but it might be worth reviewing. looks to me as if some ash update might have changed the underlying assumptions for being able to use :stream or so.