Their official update from last night:
"On Dec 11 at 7:30 PST, our main database crashed & corrupted some of the data. This is unplanned & we've been working around the clock to restore it. It's a painstakingly slow process given the scale of data. We unfortunately have no ETA but we're doing everything we can."
https://www.reddit.com/r/trakt/comments/zkle8t/trakt_downtim...
They have also been sharing updates on Twitter: https://twitter.com/trakt