get a list of table modifications in a day?

[Ottavio Campana <ottavio@xxxxxxxxxxxxx>]

I need to generate a diff (or something similar) of a table, day by day.
What is the best way to tack insert/update/delete operations? I have two
ideas, and I'd like to hear your opinion:

1) pg_dump each day and run diff
2) modify some triggers we use and store the information in another table

I am not aware of any functionality offered by postgresql. Does it exists?

If not, which solution would you prefer?

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