[Emilda] modifyin table "books"

[Wolfgang P. <wol...@iv...>]

i intend to modify table "books" by appending status columns needed to 
print labels via external utilities.
these columns are type "NOT NULL default 'blah'

questions :
do i disturb emilda's way of normal processing ?
do i have to alter also other table "deleted_books" accordingly and are 
those fields transferred accordingly ?
if not do i have to patch something not to disturb ?
anything more to obeye ?

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(the same question(s) could arise for table "users" too :-)

l.g.
wolfgang