lost data

hello, I have a database in postgresql running in linux mandriva, it is for a
system of purchases, and I am suffering an important one lost of data in
the table of products, I have all the key primary and forean made
validations, in my alone system an user has access to modify products and
you that the it doesn't erase them, like I can know as much as I space he
has assigned my database, and if I can take a registration of when the
data are eliminated, any help serves, thank you.

enzo
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