Trickplay image (and other metadata) automatic cleanup

[schnappi]

1) I was recently using LosslessCut to edit some old VHS tapes in my Jellyfin library. When a file replaces another file, but has the same file name, are tickplay images automatically regenerated? Basically, does the library scan recognize files by their name, or file hash?

2) Are trickplay images, thumbnails, and other metadata removed when a file is removed from a library?