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MySQL created this column as NOT NULL with a default timestamp of "NOW" even though we didn't ask for that when we created our table. Its a documented "feature" of the MySQL 5.0 software[1]. The latest gwtorm snapshot knows how to declare the column to be NULL DEFAULT NULL, but won't upgrade the existing column as it doesn't know how to modify column types on the fly. We also need to set all values back to NULL once the column is ready. [1] http://dev.mysql.com/doc/refman/5.0/en/timestamp.html Bug: issue 419 Change-Id: I2cabb83e66fa9b4b248aad312b9498530b969901 Signed-off-by: Shawn O. Pearce <sop@google.com> Reviewed-by: Nico Sallembien <nsallembien@google.com>