It took me a bit of time to figure this out, and it seems non-obvious,
so I thought a comment would be appropriate.
Change-Id: Ibe7220ed8f9355e3025c257057754eb4d72384b9
-- see https://www.iana.org/assignments/media-types/
img_minor_mime varbinary(100) NOT NULL default "unknown",
- -- Description field as entered by the uploader.
+ -- Foreign key to comment table, which contains the description field as entered by the uploader.
-- This is displayed in image upload history and logs.
img_description_id bigint unsigned NOT NULL,