fix promotion rewards by encoding timestamp as seconds (#884) #442

Job	Run time
clippy	2m 3s
build	2m 40s
fmt	13s
tests (ingest)	2m 11s
tests (coverage-point-calculator)	1m 22s
tests (coverage-map)	1m 46s
tests (reward-scheduler)	1m 11s
tests (task-manager)	1m 17s
tests-postgres (boost-manager)	2m 45s
tests-postgres (file-store)	2m 17s
tests-postgres (iot-config)	2m 46s
tests-postgres (iot-packet-verifier)	3m 28s
tests-postgres (iot-verifier)	2m 43s
tests-postgres (mobile-config)	2m 41s
tests-postgres (mobile-verifier)	3m 6s
tests-postgres (mobile-packet-verifier)	2m 57s
build-release	0s
	35m 26s

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