occ: Improve `user:lastseen` timestamp #8763

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.2, main)	5m 41s
integration-sqlite (collaboration_features, 8.2, main)	8m 29s
integration-sqlite (comments_features, 8.2, main)	6m 15s
integration-sqlite (dav_features, 8.2, main)	11m 6s
integration-sqlite (features, 8.2, main)	13m 21s
integration-sqlite (federation_features, 8.2, main)	8m 28s
integration-sqlite (--tags ~@large files_features, 8.2, main)	20m 2s
integration-sqlite (filesdrop_features, 8.2, main)	5m 39s
integration-sqlite (openldap_features, 8.2, main)	6m 2s
integration-sqlite (openldap_numerical_features, 8.2, main)	4m 46s
integration-sqlite (ldap_features, 8.2, main)	4m 58s
integration-sqlite (remoteapi_features, 8.2, main)	6m 2s
integration-sqlite (setup_features, 8.2, main)	4m 47s
integration-sqlite (sharees_features, 8.2, main)	10m 25s
integration-sqlite (sharing_features, 8.2, main)	22m 14s
integration-sqlite (videoverification_features, 8.2, main)	10m 30s
integration-sqlite-summary	6s
	2h 28m 57s

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