check (filetype in ('r','d','l','h','c','b','p')),
check(length(username) between 1 and 256),
check(length(groupname) between 1 and 256),
check (filetype in ('r','d','l','h','c','b','p')),
check(length(username) between 1 and 256),
check(length(groupname) between 1 and 256),