{"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":"2026-10-13T11:19:05.459773+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":"1518030","name":"No 8"},"operator":{"type":"operator","id":"P18950","name":"Cougar Coal Company Inc"},"controller":{"type":"controller","id":"C11194","name":"James H  Booth"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C11194","name":"James H  Booth et al"},"object":{"type":"mine","id":"1518030","name":"No 8"},"validFrom":"1987-09-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518030|C11194|1987-09-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P18950","name":"Cougar Coal Company Inc"},"object":{"type":"mine","id":"1518030","name":"No 8"},"validFrom":"1998-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518030|P18950|1998-03-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C11194","name":"James H  Booth et al"},"object":{"type":"operator","id":"P18950","name":"Cougar Coal Company Inc"},"validFrom":"1998-03-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1518030","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518030|P18950|1998-03-01|C11194|1987-09-01|83900"}}],"coverage":{"historyRecords":1,"edgeCount":3,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1518030","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}