media library fails and no playback

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Your database is corrupt in some way. If you know SQL you can try to find the offending entry/ies and remove them. This often occurs when there's an unexpected shutdown, whether a power outage, modification of the container without stopping first, or various other possibilities. Is this the full log? If not, you can post to privatebin.net and share here.

Somebody else can correct me if I'm wrong, but I haven't run across many folks who have successfully recovered a corrupted database.