{"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":"1517708","name":"No 7"},"operator":{"type":"operator","id":"P23642","name":"Headache Coal Company Inc"},"controller":{"type":"controller","id":"C15537","name":"Jackie  Hembree"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C13929","name":"David  Grubb"},"object":{"type":"mine","id":"1517708","name":"No 7"},"validFrom":"1989-05-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|C13929|1989-05-10|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C14542","name":"Gray Dennis"},"object":{"type":"mine","id":"1517708","name":"No 7"},"validFrom":"1992-01-22","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|C14542|1992-01-22|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P21745","name":"Headache Coal Company Inc"},"object":{"type":"mine","id":"1517708","name":"No 7"},"validFrom":"1995-09-01","validTo":"1996-07-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|P21745|1995-09-01|1996-07-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C14542","name":"Gray Dennis"},"object":{"type":"operator","id":"P21745","name":"Headache Coal Company Inc"},"validFrom":"1995-09-01","validTo":"1996-07-28","current":false,"derived":true,"evidenceMineId":"1517708","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|P21745|1995-09-01|C14542|1992-01-22|93136"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P20456","name":"G & P Contractors Inc"},"object":{"type":"mine","id":"1517708","name":"No 7"},"validFrom":"1996-07-29","validTo":"1997-02-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|P20456|1996-07-29|1997-02-16"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C13929","name":"David  Grubb"},"object":{"type":"operator","id":"P20456","name":"G & P Contractors Inc"},"validFrom":"1996-07-29","validTo":"1997-02-16","current":false,"derived":true,"evidenceMineId":"1517708","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|P20456|1996-07-29|C13929|1989-05-10|91499"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23642","name":"Headache Coal Company Inc"},"object":{"type":"mine","id":"1517708","name":"No 7"},"validFrom":"1997-02-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|P23642|1997-02-17|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C15537","name":"Jackie  Hembree"},"object":{"type":"mine","id":"1517708","name":"No 7"},"validFrom":"1997-02-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|C15537|1997-02-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C15537","name":"Jackie  Hembree"},"object":{"type":"operator","id":"P23642","name":"Headache Coal Company Inc"},"validFrom":"1997-02-17","validTo":null,"current":true,"derived":true,"evidenceMineId":"1517708","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1517708|P23642|1997-02-17|C15537|1997-02-17|95917"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1517708","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"}}