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installments notes

transaction is: thingie (01/10)
so
create transactions as:
thingie(**/10) until thingie (10/10)
if transaction starts at: (03/10)
then it should:
thingie(03/10) to thingie (10/10)
on creation, change installments transactions dates to match credit card invoice month.
so
(15/03) thingie (03/10)
(15/04) thingie (04/10)
and so on

should we control wether it's paid or not?
probably not as the idea is to have no manual conciliation of credit card transactions

should we control initial installment, and last separately?
probably not, the transaction registry itself is proof of existence.