When two TV exports disagree, pick a winner
TV Time, Trakt, and a CSV you made at 1am will not match episode numbers, show IDs, or that anime split cour. Merge by hand for the shows you still watch.
nextepisode can import. It cannot know which file is less wrong. After a shutdown, the surviving file is the one you can export again next month.
IDs beat titles
Retitles and regional names duplicate shows. TVmaze lists help, but a human still has to merge “The Office (US).”
Anime episode numbers after a split cour are a known trap. Do not let a second import reset you to E1.
Keep an export after you fix it
CSV you can leave is the point of a tracker you can trust. Fix once, export, and treat that as canonical.
Frequently asked questions
Which file should win?
The one with the shows you watched this year, then fill gaps from the other. Do not average watched flags.
What about movies mixed in?
Movies versus episode progress are different objects. Do not let a movie watched flag close a series.