Clarify different queries that can prevent rewarding #620

Job	Run time
build	2m 48s
clippy	2m 0s
fmt	22s
tests (coverage-map)	1m 39s
tests (coverage-point-calculator)	1m 39s
tests (ingest)	1m 51s
tests (reward-scheduler)	1m 10s
tests (task-manager)	1m 8s
tests-postgres (iot-config)	2m 38s
tests-postgres (file-store)	2m 11s
tests-postgres (iot-verifier)	2m 45s
tests-postgres (iot-packet-verifier)	3m 34s
tests-postgres (boost-manager)	2m 46s
tests-postgres (mobile-config)	2m 19s
tests-postgres (mobile-packet-verifier)	2m 49s
tests-postgres (mobile-verifier)	2m 43s
build-release	0s
	34m 22s

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