DRY forms

Hello,
I have a database table with about 100 fields.
I have a number of forms with only a few fields in each form based on
the fields in the table.
If I create one massive django model to represent the table and a
number of modelforms based on
the django model, this becomes inefficent because every time I update
one of my small modelforms (
which contain only a few fields), all fields in the table will get
updated. I can see this when I inspect the
sql query.
Alternatively I can create small django models and base my modelforms
on those but this isn't very DRY.
Its a alot of work.
Ideally, when I call save() on my modelform, I only want the fields on
my form to be updated. This makes sense because I am saving the
information in the form, not the entire model.
Could anyone make any suggestions for the above scenario?
Many thanks.

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