{"data":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-17T05:35:58.500035+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"4503308","name":"JOHNSON CREEK QUARRY"},"operator":{"type":"operator","id":"L14491","name":"Glacier Construction & Equipment Company Inc"},"controller":{"type":"controller","id":"M11060","name":"Jeff  Mc Clung"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L38310","name":"Sea Tac Rock Company"},"object":{"type":"mine","id":"4503308","name":"JOHNSON CREEK QUARRY"},"validFrom":"1993-10-01","validTo":"1996-02-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4503308|L38310|1993-10-01|1996-02-29"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M38310","name":"Walt  Henker"},"object":{"type":"mine","id":"4503308","name":"JOHNSON CREEK QUARRY"},"validFrom":"1993-10-01","validTo":"1996-02-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4503308|M38310|1993-10-01|1996-02-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M38310","name":"Walt  Henker"},"object":{"type":"operator","id":"L38310","name":"Sea Tac Rock Company"},"validFrom":"1993-10-01","validTo":"1996-02-29","current":false,"derived":true,"evidenceMineId":"4503308","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4503308|L38310|1993-10-01|M38310|1993-10-01|167727"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14491","name":"Glacier Construction & Equipment Company Inc"},"object":{"type":"mine","id":"4503308","name":"JOHNSON CREEK QUARRY"},"validFrom":"1996-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4503308|L14491|1996-03-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11060","name":"Jeff  Mc Clung"},"object":{"type":"mine","id":"4503308","name":"JOHNSON CREEK QUARRY"},"validFrom":"1996-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4503308|M11060|1996-03-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11060","name":"Jeff  Mc Clung"},"object":{"type":"operator","id":"L14491","name":"Glacier Construction & Equipment Company Inc"},"validFrom":"1996-03-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"4503308","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4503308|L14491|1996-03-01|M11060|1996-03-01|150665"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4503308","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}