refactor: adapt value range of CsvGraphStorage #702

Job	Run time
Build default builder image	9m 24s
Integration tests (maven, integrationtests.ConfigEnvironmentTest)	8m 35s
Integration tests (maven, integrationtests.ConfigFileTest)	9m 2s
Integration tests (maven, integrationtests.ConfigLookupTest)	8m 26s
Integration tests (maven, integrationtests.GeoToolsTest)	6m 36s
Integration tests (maven, integrationtests.GraphRepoTest)	9m 58s
Integration tests (jar, integrationtests.ConfigEnvironmentTest)	6m 35s
Integration tests (jar, integrationtests.ConfigFileTest)	5m 52s
Integration tests (jar, integrationtests.ConfigLookupTest)	2m 32s
Integration tests (jar, integrationtests.GeoToolsTest)	6m 31s
Integration tests (jar, integrationtests.GraphRepoTest)	9m 10s
Integration tests (war, integrationtests.ConfigEnvironmentTest)	6m 29s
Integration tests (war, integrationtests.ConfigFileTest)	6m 18s
Integration tests (war, integrationtests.ConfigLookupTest)	7m 11s
Integration tests (war, integrationtests.GeoToolsTest)	8m 27s
Integration tests (war, integrationtests.GraphRepoTest)	7m 45s
	1h 58m 51s

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