protect additional columns not in spec #156

Job	Run time
linux-64-py3.10	4m 45s
estimation_mode_test	15m 57s
macOS	10m 39s
develop-docbuild	0s
win-64	9m 12s
prototype_mtc	42m 17s
prototype_mtc	42m 14s
placeholder_psrc	35m 23s
random_seed_generation_test	2m 26s
prototype_psrc_in_development	3m 30s
prototype_marin	1m 23s
prototype_mtc_extended	2h 10m 54s
placeholder_sandag	1h 52m 21s
prototype_sandag_xborder	4m 0s
production_semcog	5m 0s
prototype_mwcog	43m 43s
placeholder_multiple_zone	8m 22s
	7h 52m 6s

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