> You can also use the "site switcher" on SEDE (just below the code and above the results) run the same query for other SE sites besides math.SE. For example, here's a link to
the same query for MO, which currently returns 261 results. It times out if you try to run it on the Stack Overflow database, though.
I don't know if a bot is needed, but I did write a query on the SE Data Explorer that finds links to deleted posts on other SE sites.
As the screenshot shows, there were 343 such broken links on math.SE as of last weekend's SEDE update. I've fixed about a dozen of them since then, but they'll...
