{"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":"4502403","name":"Lopez Sand & Gravel Pit"},"operator":{"type":"operator","id":"L11114","name":"Lopez Sand & Gravel"},"controller":{"type":"controller","id":"M08602","name":"Buffum M R Jr & Gary"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01386","name":"Lopez Sand & Gravel"},"object":{"type":"mine","id":"4502403","name":"Lopez Sand & Gravel Pit"},"validFrom":"1950-01-01","validTo":"1989-05-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4502403|L01386|1950-01-01|1989-05-22"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M05116","name":"Olson Robert"},"object":{"type":"mine","id":"4502403","name":"Lopez Sand & Gravel Pit"},"validFrom":"1950-01-01","validTo":"1989-05-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4502403|M05116|1950-01-01|1989-05-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M05116","name":"Olson Robert"},"object":{"type":"operator","id":"L01386","name":"Lopez Sand & Gravel"},"validFrom":"1950-01-01","validTo":"1989-05-22","current":false,"derived":true,"evidenceMineId":"4502403","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4502403|L01386|1950-01-01|M05116|1950-01-01|133791"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L11114","name":"Lopez Sand & Gravel"},"object":{"type":"mine","id":"4502403","name":"Lopez Sand & Gravel Pit"},"validFrom":"1989-05-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4502403|L11114|1989-05-23|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M08602","name":"Buffum M R Jr & Gary"},"object":{"type":"mine","id":"4502403","name":"Lopez Sand & Gravel Pit"},"validFrom":"1989-05-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4502403|M08602|1989-05-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M08602","name":"Buffum M R Jr & Gary"},"object":{"type":"operator","id":"L11114","name":"Lopez Sand & Gravel"},"validFrom":"1989-05-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"4502403","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4502403|L11114|1989-05-23|M08602|1989-05-23|143746"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4502403","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"}}