I found a book on an Overdrive site with a wait time of "99@", which usually means that the library owns zero copies of the book, but it still shows up in the search as owned. In this case, though, it was just a book with very few copies and a lot of holds.
So, could you change the fill in of "ol_wait_weeks" from Overdrive sites so that a book that has zero copies owned shows with "XX@" instead, while any calculated wait of 99 weeks or more shows as "99@". That way, I can add filters to my searches so that I don't keep trying to borrow books that aren't really there. I still want to track those books at that library, though, as they might eventually get a copy, so that a simple "Check Availability" would show that.
Thanks.
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