pg_depend

I have found that many TODO items would benefit from a pg_depend table
that tracks object dependencies.  TODO updated.

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DEPENDENCY CHECKING / pg_depend

* Auto-destroy sequence on DROP of table with SERIAL, perhaps with a separate SERIAL type
* Prevent column dropping if column is used by foreign key
* Propagate column or table renaming to foreign key constraints
* Automatically drop constraints/functions when object is dropped
* Make constraints clearer in dump file
* Make foreign keys easier to identify 

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
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