Model changes for "form-submitting mobile workers" invoicing #13491

Job	Run time
tests (python, 05)	15m 34s
tests (python, 05)	15m 34s
tests (python, 6a)	13m 30s
tests (python, 6a)	13m 30s
tests (python, bf)	16m 18s
tests (python, bf)	16m 18s
tests (python-sharded-and-javascript)	10m 23s
tests (python-sharded-and-javascript)	15m 1s
	1h 56m 8s

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