{"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":"2501036","name":"BACKHAUS SAND & GRAVEL"},"operator":{"type":"operator","id":"L00903","name":"Backus Sand & Gravel"},"controller":{"type":"controller","id":"M00763","name":"Alice Jean  Backhaus"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00763","name":"Alice Jean  Backhaus"},"object":{"type":"mine","id":"2501036","name":"BACKHAUS SAND & GRAVEL"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2501036|M00763|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L07916","name":"Northeast Sand & Gravel Inc"},"object":{"type":"mine","id":"2501036","name":"BACKHAUS SAND & GRAVEL"},"validFrom":"1985-06-01","validTo":"1991-09-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2501036|L07916|1985-06-01|1991-09-15"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M06292","name":"James H Jansen"},"object":{"type":"mine","id":"2501036","name":"BACKHAUS SAND & GRAVEL"},"validFrom":"1985-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2501036|M06292|1985-06-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M06292","name":"James H Jansen"},"object":{"type":"operator","id":"L07916","name":"Northeast Sand & Gravel Inc"},"validFrom":"1985-06-01","validTo":"1991-09-15","current":false,"derived":true,"evidenceMineId":"2501036","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2501036|L07916|1985-06-01|M06292|1985-06-01|138138"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00903","name":"Backus Sand & Gravel"},"object":{"type":"mine","id":"2501036","name":"BACKHAUS SAND & GRAVEL"},"validFrom":"1991-09-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2501036|L00903|1991-09-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00763","name":"Alice Jean  Backhaus"},"object":{"type":"operator","id":"L00903","name":"Backus Sand & Gravel"},"validFrom":"1991-09-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"2501036","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2501036|L00903|1991-09-16|M00763|1950-01-01|114710"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2501036","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"}}