No they should not be deleted.
Possibly the STWM_WATERMARKS can be recreated, but all of them are required. so far as I remember the watermarks addon create a copy of the image and add the watermark to it, these will be placed into that folder.
No they should not be deleted.
Possibly the STWM_WATERMARKS can be recreated, but all of them are required. so far as I remember the watermarks addon create a copy of the image and add the watermark to it, these will be placed into that folder.