Fix inserted_at for seniority to Utc::now() #457

Job	Run time
clippy	2m 14s
build	2m 18s
fmt	14s
tests (ingest)	2m 8s
tests (coverage-map)	1m 19s
tests (coverage-point-calculator)	1m 21s
tests (reward-scheduler)	53s
tests (task-manager)	55s
tests-postgres (boost-manager)	2m 26s
tests-postgres (file-store)	2m 6s
tests-postgres (iot-config)	2m 45s
tests-postgres (iot-packet-verifier)	3m 58s
tests-postgres (iot-verifier)	2m 39s
tests-postgres (mobile-packet-verifier)	2m 41s
tests-postgres (mobile-config)	2m 22s
tests-postgres (mobile-verifier)	3m 3s
build-release	0s
	33m 22s

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