It would be fairly simple to run the output of sqldiff through a filter that sifted out lines which only updated a column of your choosing in tables of your choosing. This would be simpler than using your eyes and brain, and less annoying too. With slightly more effort, sqldiff.c could be made to accept an option telling it to ignore a table,column combination. That would be a better ask than specializing the tool to "ignore all 'DEFAULT CURRENT_TIMESTAMP' columns". I would be remiss to neglect mention of what could be done with the sqlite3 shell, attaching the databases of interest, and specifying joins on tables that might be similar but not identical. You could ignore any set of columns that way.