How would you model this? Kind of different...

Bit of a long-winded background to what we have here. Sorry... We are building a new warehouse. Data comes from shops around the world - machines that use Cad to cut material. Two main metrics - the job_run and each of those can have many cuts. In the warehouse I had planned on building out on a time dimension of day, and the our location (down to machine), material, and some other dimensions. The fact table kept the total length of cuts, number of cuts, total length of job, number of jobs, - all per day etc. Seemed pretty straight forward.
Then, we got some requirements on some of the questions they want answered. For example, how many cuts took longer than 30 seconds in a given day? Well, I had thought maybe I create another column in the fact table that just stored this metric and calculated it when we did the nightly load. But... we were told there could be many more of these types of ad-hoc queries - and I don't want to keep recoding the load.
So, we realized we need to store each cut and job and their length and other attributes in the fact table - no roll up. What I'm wondering is... with this level of detail, the current dimension keys won't make each row unique. I basically need each cut ID, but is that a dimension? Is it normal to just store an ID with no dimension as part of the composite key? I thought of adding that to a dimension with job... but that seems odd. For example, some jobs have no cuts (they fail) and they want to know how many. Kind of hard when you don't have any rows in the fact table for that. Almost thought of another fact table for job... Anyway, this threw me for a loop.
Thoughts on how others would do this?

Thanks - yes, I've started looking at this stuff. I think I was preoccupied with using the dimension PKs to make the composite primary key for the fact table. I think it's best just to use the cut ID. The other issue was the "what doesn't happen" events. It's like having an order with no line items. If I've got no cut for a job, there's no point in creating one (like an outer join) since there's a lot of these. (User error, bit breaks, etc.) I think the idea of having a separate table for these I can get the failed jobs only...
Thanks guys.

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