feat: elaborate TODOs #772

Job	Run time
test-fake-database	26s
test-server	2m 1s
framework (random, no-auth)	3m 58s
framework (controlled, no-auth)	4m 2s
core (random, all-features)	35m 18s
core (random, single-seller)	37m 13s
core (random, no-payment-reconciliation)	34m 39s
core (random, no-auth)	34m 41s
core (random, no-tax-calculation)	36m 42s
core (random, prepayment-always-required)	36m 5s
core (random, facilityuse-has-slots)	34m 14s
core (controlled, all-features)	39m 0s
core (controlled, single-seller)	37m 9s
core (controlled, no-payment-reconciliation)	36m 26s
core (controlled, no-auth)	35m 45s
core (controlled, no-tax-calculation)	37m 2s
core (controlled, prepayment-always-required)	38m 52s
core (controlled, facilityuse-has-slots)	35m 21s
deploy-reference-implementation	0s
publish-server	0s
publish-fake-database	0s
	8h 38m 54s

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