Optionalchecksum?: stringEpoch timestamp in milliseconds when this revision was created.
OptionallastRetrieved?: numberEpoch timestamp in milliseconds when this revision was last loaded onto the scene. Used to determine whether to delete unused files from storage.
Optionalmessage?: stringOptional note describing what changed in this revision.
OptionalsourceName?: stringOriginal upload filename shown to the user.
Content hash for integrity checks and optional deduplication.