Someone correct me if I'm wrong, but the sequence numbers Lightroomor CaptureOne Pro (I'm currently using both) supports in file naming (at import or export) are not continuous, right? In other words, if I import or export 100 images today, and then in a few days import or export another batch, it won't continue at 101 unless I manually tell it to start there. Right?
If so, is there another way to accomplish that, either in the filename or in metadata -- and to do so automatically irrespective of what camera, card, etc was used? Literally a continuously running sequence? A plugin or setting that I've missed?
What I'm effectively trying to achieve is a "serial number" of sorts for all of my photos. Every single photo that gets imported and its variants/clones -- and then preserve its "serial number" any time it's exported so one can easily identify it by referencing the serial number in the filename or by backside prints.

