Upgrade von 2.7 auf 3.1 schlägt fehl: "hotlinked_media_status" existiert bereits

[merefield (Robert)]

This was a subject of a fix last year, strangely.

Upgrade fails on duplicate key error ("index post hotlinked media on post id and url md5")

Great, thanks for confirming! I opened a PR with a fix for that one:

@david forgive me for mentioning you, but this is completely relevant to that fix, would you care to chime in here?