Strange deletion problem

Hi, I have a table which is constantly updated through out the day with no problems, I'm running Postgresql 8.3.8 in ubuntu karmic. However, within the last week for some reason overnight it is being emptied and I can't work out why. I've set log_min_duration_statement to 0 so that postgresql dumps out every query made to the db but it hasn't brought anything up. During the period between from when I know the table is ok to the next morning when it is empty I can see entries in the logs for the expected 200 or so deletions, but during this period approx 15k rows are removed. The odd thing is that there is nothing else in the logs that references the table (I've looked for the obvious deletion and trunctate statements).

The table is modified using JDBC prepared statements so I see 3 entries for each of the expected delete statements (parse, bind, execute) and the statement is as follows:

delete from product_list where retailer_id=? and product_id=?

Therefore I have a few questions:
- Is there any other statements that could be causing the rows to be removed that I've missed
- Is there anything that could be deleting them without generating a log entry for the statement?
- Is it possible that data corruption of either the index/table is making my delete statements removed more rows?
- Is it a possibly bug?

Thanks

John
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