remove manually deleted images when re-importing
I usually do not reject bad images within Darktable. I shoot JPEG+RAW and I find it easier/faster doing it with a file manager and an external viewer (eog, geequie) before importing raw files. All is fine unless a go for a second round and discard more picture; in that case the missing raw files are still shown in the Light Table. I think DT should take care of this problem, maybe removing missing files when re-importing a folder.