Snippets?

Is there any way in postgresql to have a "snippet" of SQL code which you could apply to all tables. Something you could add which would ensure that every table always has a Created, Changed and Deleted column for example. Sort of like a C include I suppose. Of course if I'm building a DB schema by hand I could just copy and paste those columns but it still seems a bit too, darn humans!, error prone.

Ken LaCrosse
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