Solved this by setting solid_queue as the default adaptor and subsclassing all sidekiq jobs from a new SidekiqApplicationJob. As I further my migration over to solid_queue I'll just change each job subclass ApplicationJob
As I slowly migrate my background jobs from sidekiq to solid_queue, one hurdle is being able to set the queue_adaptor for the built in Rails jobs - mailers, action_mailbox_routing etc?
Anyone know how? (not the queue name, the adaptor to use)