foreign keys on multiple parent table

Hello guys,
I've many tables representing as many concepts.

For each record of each table I need to store extra information (think to
audit information, but more complex than a simple text)

The relation is 1:N, for each record there could be many audit records.

From programming point of view and also to reduce the number of objects in
DB could be convinient create just an audit table with a structure like:

- auditi id
- reference_uuid (the key of the main table)
- table_name
- list of audit data

Could work, but is there a way to set a reference key over the uuid of all
the tables?

--
Domenico L.

per stupire mezz'ora basta un libro di storia,
io cercai di imparare la Treccani a memoria... [F.d.A.]